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WO2018147375A1 - Tuyau perforé plat en aluminium extrudé présentant d'excellentes propriétés de brasage et une excellente résistance à la corrosion de surface extérieure, et échangeur de chaleur en aluminium réalisé à partir de celui-ci - Google Patents

Tuyau perforé plat en aluminium extrudé présentant d'excellentes propriétés de brasage et une excellente résistance à la corrosion de surface extérieure, et échangeur de chaleur en aluminium réalisé à partir de celui-ci Download PDF

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Publication number
WO2018147375A1
WO2018147375A1 PCT/JP2018/004423 JP2018004423W WO2018147375A1 WO 2018147375 A1 WO2018147375 A1 WO 2018147375A1 JP 2018004423 W JP2018004423 W JP 2018004423W WO 2018147375 A1 WO2018147375 A1 WO 2018147375A1
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WO
WIPO (PCT)
Prior art keywords
aluminum
tube
brazing
sacrificial anode
flat multi
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2018/004423
Other languages
English (en)
Japanese (ja)
Inventor
中村　真一
尚希 山下
英敏 熊谷
永尾　誠一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UACJ Corp
UACJ Extrusion Corp
Original Assignee
UACJ Corp
UACJ Extrusion Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by UACJ Corp, UACJ Extrusion Corp filed Critical UACJ Corp
Priority to JP2018567493A priority Critical patent/JPWO2018147375A1/ja
Priority to CN201880011516.2A priority patent/CN110291355A/zh
Priority to DE112018000797.9T priority patent/DE112018000797T5/de
Publication of WO2018147375A1 publication Critical patent/WO2018147375A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/19—Soldering, e.g. brazing, or unsoldering taking account of the properties of the materials to be soldered
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/089—Coatings, claddings or bonding layers made from metals or metal alloys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
    • F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
    • F28F2255/16—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes extruded

Definitions

  • the present invention relates to an aluminum extruded flat multi-hole tube excellent in brazing properties and outer surface anticorrosion properties and an aluminum heat exchanger using the same, and more particularly, a heat exchanger, particularly a heat exchanger for an automobile such as a car air conditioner.
  • extruded flat multi-hole pipes with a flat cross-sectional shape as a whole obtained by extrusion processing of aluminum materials have been used as refrigerant passage pipes in automotive heat exchangers, and refrigerant flows through the refrigerant passages.
  • a heat exchanger is constructed by assembling and brazing aluminum fins clad with an aluminum brazing material in a direction perpendicular to the refrigerant passage tube, and heat is produced along the fins. By flowing air as an exchange fluid, heat exchange is performed between the refrigerant and the air.
  • JP-A-6-142755 Patent Document 1
  • JP-A-5-222480 Patent Document 2
  • WO2013 / 125625 Patent Document 3
  • Zn is adhered to the surface of the extruded flat multi-hole tube in advance by a method such as spraying or painting.
  • the Zn diffusion layer formed on the tube surface layer acts as a sacrificial anode for the tube layer deeper than the Zn diffusion layer by brazing heating, and corrodes in the tube thickness direction. Is suppressed, and the penetrating life of the tube is extended.
  • the extruded flat multi-hole tube requires a Zn adhesion process such as spraying and coating of Zn after being extruded, and then a fluoride-based flux coating process necessary for brazing or heat.
  • brazing fins clad with the brazing material are required for the fin material to be assembled. This also leads to an increase in cost compared to the case of using a bare fin material in which the brazing material is not clad.
  • an aluminum alloy having a specific component composition is used singly as disclosed in the above-mentioned JP-A-5-222480 (Patent Document 2).
  • Patent Document 2 JP-A-5-222480
  • the flat multi-hole tube itself does not have brazing properties and has an outer surface.
  • the anti-corrosion property sufficient, but it can not only fully meet the recent demands for high anti-corrosion properties and cost reduction, but also the tube obtained from the fact that the entire tube is made of a specific aluminum alloy.
  • the characteristics are limited by an aluminum alloy having such a specific alloy composition.
  • Patent Document 4 a composite billet composed of an aluminum core material forming material and a skin material forming material made of an Al—Si based aluminum brazing alloy material is used simultaneously.
  • a method of manufacturing a clad tube in which a brazing filler metal layer is clad on the outer surface flat portion of the tube peripheral wall by extrusion, but such a clad tube has no sacrificial anode effect. The outer surface did not have anticorrosive properties.
  • the inventors of the present invention have made extensive studies in order to advantageously improve the brazing property and outer surface corrosion resistance of the outer periphery of the aluminum extruded flat multi-hole tube obtained by extrusion processing of an aluminum material.
  • a sacrificial anode / brazing material portion made of such an Al—Si—Zn-based aluminum alloy can be advantageously exposed on the outer periphery of the flat multi-hole tube to form a sacrificial anode / brazing material portion, and Due to the presence of the sacrificial anode / brazing material part, effective brazing properties can be obtained, and the sacrificial anode effect that can be exhibited makes aluminum It was found that may also impart excellent outer surface corrosion resistance to the tube outer periphery
  • the object of the present invention is to provide an aluminum extruded flat multi-hole tube that effectively imparts excellent brazing properties and excellent outer surface anticorrosive properties at the outer periphery of the multi-hole tube.
  • An object of the present invention is to provide a useful aluminum heat exchanger obtained by using the heat exchanger.
  • an extruded tube having an overall flat cross-sectional shape obtained by extrusion processing of an aluminum material, the tube shafts independently of each other.
  • An aluminum extruded flat multi-hole pipe having a plurality of flow paths extending in parallel to the direction and arranged in the longitudinal direction of a flat cross-sectional shape, and the aluminum material as the aluminum material
  • a sacrificial anode / brazing material made of an Al—Si—Zn-based aluminum alloy that is electrochemically less basic than the aluminum tube body material, and the outer peripheral wall portion of the tube
  • the sacrificial anode / brazing material is exposed to the entire region or at least a part of the flat portion of the outer peripheral wall of the tube to form a sacrificial anode / brazing material portion.
  • the aluminum extruded flat multi-hole tube having excellent brazing properties and the outer surface corrosion resistance, characterized the door, it is to its gist.
  • the sacrificial anode / brazing material contains Si: 1.0 to 13.0 mass. % And Zn: 0.1 to 7.0% by mass, with the balance being aluminum and an aluminum alloy that is an inevitable impurity, while the aluminum tube body material is Cu: 0.7% by mass or less and Mn: 1.4% by mass or less, and the balance is made of aluminum and an aluminum alloy that is an inevitable impurity.
  • the aluminum alloy constituting the sacrificial anode / brazing material further contains Mn: 1.4 mass% or less, Cr: 0.05 One or two of ⁇ 0.30 mass%, Zr: 0.05 to 0.30 mass%, Ti: 0.05 to 0.30 mass%, and Sr: 0.0001 to 0.1 mass% Contains the above.
  • the aluminum alloy constituting the aluminum tube main body material further contains Cr: 0.05 to 0.30 mass%, Zr: 0.05 to 0.30 mass%. , Ti: 0.05 to 0.30% by mass and Sr: 0.0001 to 0.1% by mass or more.
  • the sacrificial anode / brazing material portion located on the outer peripheral wall portion of the tube has a thickness of the outer peripheral wall portion of the tube. It is made to exist in the ratio below%.
  • the sacrificial anode / brazing material portion is 50% or more and 100% or less of the circumference of the tube outer peripheral wall portion in the tube cross section. It is configured to exist in proportion.
  • the potential difference between the sacrificial anode / brazing material and the aluminum tube body material is 5 mV or more and 300 mV or less. preferable.
  • the extruded aluminum material is composed of the aluminum tube main body material and the sacrificial anode / brazing material.
  • a composite billet will be used.
  • the composite billet is composed of a core billet made of the aluminum tube main body material and the sacrificial anode / brazing material located around the core billet. It has an integral core-sheath structure composed of a sheath billet.
  • the extruded tube is generally formed by extrusion processing of the aluminum material using a port hole die.
  • this invention is comprised including the aluminum extrusion flat multi-hole pipe
  • the gist of the present invention is also an aluminum heat exchanger.
  • the Al—Si—Zn-based aluminum alloy is formed over the entire outer periphery of the tube, or at least a part of the flat portion of the outer periphery of the tube.
  • the sacrificial anode / brazing material portion composed of the sacrificial anode / brazing material is exposed and made to exist, it exhibits excellent brazing properties, and by the sacrificial anode effect of the sacrificial anode / brazing material, The outer surface anticorrosion can be effectively enhanced, and as a result, it is advantageously used as a heat exchanger tube for heat exchangers such as radiators and heaters, which have excellent brazing and outer surface anticorrosion properties on the tube outer surface side. It was to get.
  • the aluminum extruded flat multi-hole tube according to the present invention is composed of an aluminum tube main body material and a sacrificial anode / brazing material made of an Al—Si—Zn-based aluminum alloy, and is formed by simultaneous extrusion of these two materials. Therefore, the characteristics as a tube are ensured by the aluminum tube body material, while the brazing property and the external corrosion resistance are effectively exhibited by such a specific sacrificial anode / brazing material. Thus, the design flexibility of the target extruded flat multi-hole tube can be advantageously increased.
  • an aluminum heat exchanger constituted by assembling an aluminum extruded flat multi-hole tube according to the present invention and an aluminum outer fin and joining them by brazing heating
  • the aluminum extruded flat multi-hole The excellent anticorrosive properties of the outer surface of the tube can also advantageously increase the anticorrosion properties as a heat exchanger.
  • FIG. 1 schematically shows an example of an aluminum extruded flat multi-hole pipe according to the present invention in the form of a cross section that is a cross section perpendicular to the longitudinal direction (tube axis direction).
  • the flat multi-hole tube 10 according to the present invention is an extruded tube of an aluminum material having a flat cross-sectional shape as a whole as shown in FIG. And a plurality of rectangular flow paths 12 extending in parallel with each other, and the plurality of flow paths 12 are arranged at predetermined intervals in a flat longitudinal direction (left-right direction in the drawing) that is a tube width direction. It is a structure that is damped.
  • the corresponding upper surface and lower surface of the flat multi-hole tube 10 are respectively flat surfaces, and outer fins (not shown) such as plate fins and corrugated fins can be described later, as in the prior art.
  • outer fins such as plate fins and corrugated fins can be described later, as in the prior art.
  • it can be used as a heat exchanger by being attached by a brazing joint technique.
  • the cross-sectional shape of the flow path 12 is a rectangular shape here, it is possible to adopt a known circular shape, an elliptical shape, a triangular shape, or a combination of various shapes. is there.
  • the internal partition located between the adjacent flow paths 12 and 12 is used. While a normal aluminum tube body material is present around the flow path 12 including the portion 16, a flat surface that provides at least the flat surface in the tube outer peripheral wall portion 14 of the entire circumference of the tube outer peripheral wall portion 14.
  • a sacrificial anode / brazing material portion 18 composed of a sacrificial anode / brazing material made of an Al—Si—Zn-based aluminum alloy is present in a part of the portion, and the sacrificial anode / brazing material portion 18 is formed into a tube.
  • the sacrificial anode / brazing material portion 18 is preferably 50% or more, more preferably 60%, of the circumferential length L of the pipe outer peripheral wall portion 14. %, More preferably 70% or more, and 100% or less. If the sacrificial anode / brazing material portion 18 is present in an area of less than 50% of the circumferential length L of the tube outer peripheral wall portion 14, there is a concern that defects such as unbonded fins or peeling off of the fins may occur during brazing heating.
  • the sacrificial anode / brazing material portion 18 located on the tube outer peripheral wall portion 14 has a thickness Ta of 90% or less of the thickness Ts of the tube outer peripheral wall portion 14. It is preferably configured as described above, and particularly desirably, it is allowed to be present at a ratio of 80% or less, and the lower limit thereof is preferably 1% or more, more preferably 5% or more, It will be made to exist. That is, Ta ⁇ 0.9 ⁇ Ts, and Ta ⁇ 0.01 ⁇ Ts is preferable.
  • the corrosion of the sacrificial anode / brazing material portion 18 is reduced.
  • the thickness becomes too thin the pressure resistance strength of the flat multi-hole tube 10 is reduced, or when the sacrificial anode / brazing material portion 18 is melted during brazing, a through-hole is generated in the outer peripheral wall portion 14. To come up with.
  • the sacrificial anode / brazing material portion 18 is exposed on the outer surface of the outer peripheral wall portion 14 of the flat multi-hole tube 10 as shown in FIG. 18 is desirably continuously exposed over the entire circumference of the pipe on the outer surface of the pipe outer peripheral wall portion 14, but the exposure ratio in the circumferential direction of the sacrificial anode / brazing material portion 18 in the pipe axis direction. May be different from each other, partially discontinuous in the pipe circumferential direction or the pipe axis direction, or exposed in a form extending in the pipe axis direction at a plurality of positions in the pipe outer circumference direction at a predetermined length. There is no problem. In the present invention, advantageously, such a sacrificial anode / brazing material portion 18 is always exposed to the outer surface of the tube outer peripheral wall portion 14 in an arbitrary cross section of the flat multi-hole tube 10. Will be adopted.
  • the sacrificial anode / brazing material portion 18 is exposed over at least 50% or more of the peripheral length L of the tube outer peripheral wall portion 14, so that the brazing property and the anticorrosive property due to the sacrificial anode effect are exhibited.
  • the sacrificial anode / brazing material portion 18 has a circumferential length L of the tube outer peripheral wall portion 14. It exists when it exists over the full length. It is not necessary for the sacrificial anode / brazing material portion 18 exposed on the outer surface of the tube to have the same thickness in the tube circumferential direction. For example, as shown in FIG. It is also possible for the sacrificial anode / brazing material portion 18 to be present at different thickness ratios.
  • an Al—Si—Zn-based aluminum alloy is advantageously used as the material of the sacrificial anode / brazing material constituting the sacrificial anode / brazing material portion 18.
  • an aluminum alloy containing Si: 1.0 to 13.0 mass% and Zn: 0.1 to 7.0 mass% with the balance being aluminum and inevitable impurities is used.
  • Si is a brazing filler metal component, and when its content exceeds 13.0% by mass, the melting point rapidly decreases, and there is a concern that the base metal is melted during brazing heating. Moreover, when Si content becomes less than 1.0 mass%, the problem that brazing property falls will be raised.
  • Zn is a sacrificial anode material component, and if its content exceeds 7.0% by mass, the melting point decreases, and there is a concern that the base material is melted during brazing heating, while the Zn content If the amount is less than 0.1% by mass, it is difficult to sufficiently exhibit the sacrificial anode effect.
  • Mn 1.4% by mass or less (not including 0% by mass)
  • Cr 0.05 to 0.30% by mass
  • Zr 0.05 to 0.30% by mass
  • Ti 0.05 to 0.30% by mass
  • Sr 0.0001 to 0.1% by mass, or one or more of them may be contained. It will be.
  • the content of Mn exceeds 1.4% by mass, there is a problem that deformation resistance at the time of extrusion increases and high-speed extrusion becomes difficult, and a pickup phenomenon may occur at high-speed extrusion. Occurs.
  • Cr, Zr, Ti and Sr are alloy components that coarsen the crystal grain size after brazing and improve brazeability, and when their content is less than the range specified above, On the other hand, when the content of these alloy components is more than the above specified range, the generation of coarse compounds in the extrusion material obtained by casting becomes remarkable. This causes problems such as deterioration of the extrudability.
  • the lower limit of Mn which is an alloy component suitably contained in such an Al—Si—Zn-based aluminum alloy, is generally about 0.1% by mass.
  • an aluminum tube main body material which is a material other than the sacrificial anode / brazing material that is exposed by constituting at least a part of the outer peripheral wall portion 14 of the tube is conventionally extruded.
  • Aluminum materials used in the manufacture of flat multi-hole pipes can be used as they are, for example, JIS-named A1000 series pure aluminum materials, A3000 series aluminum alloy materials, etc. can be used.
  • Cu 0.7% by mass or less (not including 0% by mass)
  • Mn 1.4% by mass or less (not including 0% by mass) are advantageous.
  • the balance is aluminum and an aluminum alloy with inevitable impurities.
  • the Cu content exceeds 0.7% by mass, there is a problem that deformation resistance at the time of extrusion rises, making high-speed extrusion difficult, and pickup phenomenon occurs at high-speed extrusion. The fear of doing.
  • the Mn content exceeds 1.4% by mass, there is a problem that deformation resistance at the time of extrusion increases and high-speed extrusion becomes difficult, and a pickup phenomenon may occur at high-speed extrusion.
  • generally 0.1% by mass is advantageously employed as the lower limit value of Cu, and 0.1% by mass is generally advantageously employed as the lower limit value of Mn. .
  • such an aluminum alloy for a pipe body material containing Cu and Mn also contains Cr: 0.05 to 0.30 mass%, Zr: 0.05 to 0.30 mass%, Ti: 0 It is desirable that one or two or more of 0.05 to 0.30% by mass and Sr: 0.0001 to 0.1% by mass are contained.
  • the added Cr, Zr, Ti, and Sr are alloy components that coarsen the crystal grain size after brazing and improve the brazing property, respectively, and their contents are defined above. When the content is less than the range, the effect of adding these alloy components becomes insufficient. On the other hand, when the content of the alloy components exceeds the specified range, generation of coarse compounds in the extrusion material obtained by casting is remarkable. Therefore, problems such as a decrease in extrudability are caused.
  • the remaining aluminum other than the above alloy components is naturally contained in the production of the material.
  • the inevitable impurities composed of various elements such as Fe, Ni, Pb, Bi the total content of these inevitable impurities is regulated within a generally recognized range, and is usually 0.5% by mass or less. Preferably, the ratio is controlled to be 0.3% by mass or less.
  • the sacrificial anode / brazing material used in the present invention is electrochemically lower than the aluminum tube body material. Therefore, the potential difference between these materials exceeds 0 mV, but is preferably in the range of 5 mV to 300 mV. When this potential difference is 5 mV or more, the sacrificial anode effect is surely easily exhibited even in a more severe corrosive environment. On the other hand, when the potential difference exceeds 300 mV, the sacrificial anode effect becomes prominent, and problems such as severe corrosion consumption of the sacrificial anode / brazing material are caused.
  • the sacrificial anode / brazing material portion 18 is lower in potential than the internal partition wall portion 16 made of the aluminum tube main body material, the peripheral wall portion of the flow path 12, and the like, an effective sacrificial anode effect can be exhibited.
  • the corrosion resistance of the outer peripheral surface of the pipe can be expressed more advantageously.
  • the flat multi-hole tube 10 according to the present invention as described above is manufactured by using the above-described aluminum tube main body material and the sacrificial anode / brazing material as the aluminum material to be extruded, and simultaneously extruding these materials.
  • the aluminum tube main body material and the sacrificial anode / brazing material are generally used in combination of a composite billet having a core-sheath structure or a plurality of billets.
  • the billet made of the sacrificial anode / brazing material has a cross-sectional shape such as a circular shape, an oval shape, an elliptical shape, a rectangular shape, a half-moon shape, a crescent shape, or a polygon shape, and a cross-sectional dimension.
  • a cross-sectional shape such as a circular shape, an oval shape, an elliptical shape, a rectangular shape, a half-moon shape, a crescent shape, or a polygon shape, and a cross-sectional dimension.
  • a sheath billet is formed by providing a through-hole of a predetermined size at the center of a billet made of a sacrificial anode / wax material, and
  • the sheath billet is produced in the form of being divided into two, and in the space of the split sheath billet,
  • the target composite billet can be formed by a method of fixing the whole by welding or the like and integrating them.
  • a hot extruding technique is applied to such a composite billet using a die having a plurality of extrusion ports, a so-called port hole die, as in the case of manufacturing a conventional extruded flat multi-hole tube.
  • the target extruded flat multi-hole tube can be obtained.
  • a die having a long extrusion port arranged to correspond to a plurality of flow paths of the flat multi-hole tube the composite billet is disposed so that the longitudinal direction of the predetermined cross-sectional shape of the aluminum tube main body material disposed inside the composite billet coincides with the longitudinal direction of the extrusion port of the die. Inter-extrusion is performed.
  • the sacrificial anode and the brazing material in the composite billet can be effectively distributed to the flat outer periphery of the obtained flat multi-hole tube.
  • the brazing material portion can be advantageously exposed to the outer peripheral surface of the pipe.
  • tube according to this invention as mentioned above can be used suitably as a refrigerant
  • a refrigerant passage pipe for example, a pair of aluminum header tanks arranged at a distance from each other, and a width direction ventilation direction between both header tanks Facing each other, a plurality of extruded aluminum flat multi-hole pipes arranged in parallel with each other at intervals in the longitudinal direction of the header tank and having both ends connected to both header tanks, and adjacent flat multi-hole pipes Between and between the flat multi-hole pipes at both ends and brazed to these flat multi-hole pipes, and aluminum corrugated fins as outer fins, and arranged outside the corrugated fins at both ends, In a structure comprising an aluminum side plate brazed to such fins, a heat exchanger will be configured.
  • a heat exchanger of such structures as the
  • a pair of header tanks in a heat exchanger distributes and flows refrigerant or coolant from one header tank to a flat multi-hole tube, while the other header tank is flat flat.
  • the header plate and the header plate are brazed facing each other, or the plate is bent into a tubular shape and stacked.
  • an extruded tube or the like extruded into a tubular shape will be used.
  • various billets A to U for the sacrificial anode and brazing material having the component compositions shown in Table 1 below and various components having the component compositions shown in Table 3 below.
  • various billets B1 to B37 shown in Table 5 below were prepared by various combinations of these billets, and then the composite billets were respectively hot extruded.
  • various flat multi-hole tubes T1 to T37 corresponding to these composite billets shown in Table 5 below were obtained.
  • various sacrificial anode / brazing material billets V to AF having the component compositions shown in Table 2 below and various aluminum tube main body billets r to w having the component compositions shown in Table 4 below are cast.
  • various billets B38 to B54 and a single billet B55 shown in Table 6 below are prepared by combining these billets in various combinations, and then the composite billet and the single billet are respectively subjected to hot extrusion.
  • various flat multi-hole tubes T38 to T55 corresponding to these billets were obtained.
  • the sacrificial anode / brazing material billets A to U shown in Table 1 and the sacrificial anode / brazing material billet V shown in Table 2 are used.
  • Each of the alloy components was adjusted so as to give .about.AF, and various DC cast billets of 90 mm.phi. Were prepared according to a conventional method.
  • the alloy components were adjusted to give the tube body material billets a to q shown in Table 3 and the tube body material billets r to w shown in Table 4, A billet produced in the same manner as described above was molded and processed into a cylindrical body having a predetermined dimension within a circular dimension of 5 mm to 85 mm.
  • a through hole into which the processed pipe body material billet can be inserted is formed in the center of the cross section of the sacrificial anode / wax material billet, and the pipe body material billet is inserted into the through hole.
  • the billet for the sacrificial anode / brazing material and the billet for the tube body material are fixed and joined to each other in the longitudinal direction by MIG welding, and each of the extrusion (composite) billets B1 shown in Table 5 is used.
  • ⁇ B37 were fabricated as an integral composite billet 20 having a cross-sectional configuration as shown in FIG.
  • extrusion billets B38 to B54 and B55 each consisting of the billet combinations shown in Table 6 were produced.
  • the extrusion billet B55 is a single billet shown as 30 in FIG. 2 and 3, reference numerals 22 and 32 are billets for tube main body materials, and reference numeral 24 is a billet for sacrificial anode and brazing material.
  • the composite billet 20 or the single billet 30 thus obtained was heated to 500 ° C. with a billet heater and then provided with an extrusion port for forming eight rectangular holes (eight flow paths).
  • an extrusion port for forming eight rectangular holes (eight flow paths).
  • the formation range of the sacrificial anode / brazing material portion (18) is 50% or less of the circumference L of the outer peripheral wall portion of the pipe.
  • it was less than 50% of the tube outer peripheral wall circumferential length L it was evaluated as ( ⁇ ).
  • the thickness of the sacrificial anode / brazing material portion (18) in the outer peripheral wall portion (14) is 90% or less of the thickness of the outer peripheral wall portion (14) ( ⁇ )
  • the thickness exceeds 90% Evaluation was made as ( ⁇ ).
  • Tables 7 and 8 below show the results of measuring the formation range of the sacrificial anode / brazing material portion (18) for the flat multi-hole tubes T1 to T37 and the flat multi-hole tubes T38 to T55.
  • the maximum thickness of the sacrificial anode / brazing material portion (18) in the outer peripheral wall portion (14) is shown. .
  • the sacrificial anode / brazing material portion (18) comprising the sacrificial anode / brazing material billet is formed on all the outer peripheral wall lengths of the flat multi-hole tubes T1 to T37 obtained by the extrusion process. It was confirmed that was exposed at a ratio of 50% or more and 100% or less of the circumference of the pipe outer peripheral wall. Further, the thickness of the sacrificial anode / brazing material portion (18) formed on the outer peripheral wall portion (14) is in a range of 90% or less of the thickness of the outer peripheral wall portion (14). It was confirmed that the sacrificial anode / brazing material part (18) was exposed.
  • the sacrificial anode / brazing material portion (18) formed by the sacrificial anode / brazing material billet. ) was also stably exposed on the outer surface of the pipe outer peripheral wall.
  • flat multi-hole tubes T38, T39, and T55 obtained by hot extrusion using a port hole die using composite billets B38 and B39 and a single billet B55 have sufficient contents of Si and Zn. Since no billet or billet for the sacrificial anode / brazing material is used and the billet is made of a conventional alloy, there was no exposed portion of the sacrificial anode / brazing material portion (18). Further, the flat multi-hole tube T40 obtained by the above method using the composite billet B40 shown in Table 6 is such that the exposed portion of the sacrificial anode / brazing material portion (18) is 100% of the peripheral length of the outer peripheral wall portion of the tube.
  • the thickness of the outer peripheral wall portion (14) was 93% at the thickest part. Further, the flat multi-hole tubes T41 to T54 obtained by the above method using the composite billets B41 to B54 shown in Table 6 are all exposed parts of the sacrificial anode / brazing material part (18). The wall peripheral length L was less than 50%, and the thickness of the pipe outer peripheral wall (14) was 10 to 20% at the thickest part.
  • the flat multi-hole tubes T38, T39 and T55 basically use no sacrificial anode / brazing material billet, and are a conventional alloy and a pure Al alloy, so the sacrificial anode / brazing material portion (18) is Not formed.
  • brazing heating for fin bonding when the flat multi-hole tubes T1 to T37 and flat multi-hole tubes T38 to T55 are used as heat transfer tubes in a heat exchanger is assumed. Then, after heat treatment at 600 ° C. for 3 minutes, they were cut in a length of 40 mm in the longitudinal direction of extrusion. In this heat treatment, since melting was observed in the flat multi-hole tube T40, subsequent evaluation could not be performed.
  • the test material for measuring the potential of the tube body material is for measuring the potential on one side of the cut end surface while leaving the exposed surface of the tube body material of 10 mm ⁇ 10 mm at the center in the width direction of the inner surface on one side of the peripheral wall.
  • test material for measuring the potential of the sacrificial anode / brazing material part (sacrificial anode material) is a sacrificial anode / brazing material part (10 mm ⁇ 10 mm) at the center in the width direction of the flat outer flat part. 18) Except for the exposed surface of 18), all of the cut end surface except for the portion where the lead wire for potential measurement was connected was masked with silicone resin to be electrically insulated.
  • a saturated KCl calomel electrode (SCE) is used as a reference electrode, while a 5% NaCl aqueous solution adjusted to pH 3 with acetic acid is used as a test solution.
  • SCE saturated KCl calomel electrode
  • a 5% NaCl aqueous solution adjusted to pH 3 with acetic acid is used as a test solution.
  • a method of measuring each potential after immersing the test material in the solution for 24 hours while stirring at room temperature was employed.
  • the flat multi-hole tubes T38 to T55 are used as test materials, the flat multi-hole tubes T38, T39 and T55 are basically composed of sacrificial anode and brazing material. Therefore, the potential difference was 0 mV because it was a flat multi-hole tube substantially composed only of the same tube body material as the conventional material.
  • the sacrificial anode / brazing material portion (18) of the flat multi-hole tube T43 contained 8% by mass of Zn.
  • the potential difference between the sacrificial anode / brazing material portion (sacrificial anode material) and the tube body material after brazing heating was 355 mV or more.
  • bare fins corrugated into a fin pitch of 3 mm and a fin height of 7 mm are assembled to the flat multi-hole tubes T1 to T37 and flat multi-hole tubes T38 to T55.
  • a heat exchanger core is formed by heat treatment at 600 ° C. for 3 minutes, and then each heat exchanger core The fins joined to the flat multi-hole tube were cut and removed with a cutter, and the joining state of the fins was confirmed.
  • heat exchanger cores are manufactured using the flat multi-hole tubes T1 to T37 and the flat multi-hole tubes T38 to T55 as test materials, and fin bonding of the heat exchanger cores after brazing heating The results of verifying the defects are shown respectively.
  • the flat multi-hole tubes T38, T39, and T55 shown in Table 12 are basically made of a conventional material or a tube body material made of a pure Al alloy without using a sacrificial anode / brazing material. Since it was the flat multi-hole pipe
  • brazing heating for fin bonding when the flat multi-hole tubes T1 to T37 and flat multi-hole tubes T38 to T55 are used as heat transfer tubes in a heat exchanger is assumed. After heat treatment at 600 ° C. for 3 minutes, they were cut to a length of 100 mm in the longitudinal direction of extrusion, and both ends of the cut end face where the flow channel was exposed were masked with silicone resin. Moreover, the test liquid used for the SWAAT test produced the artificial seawater by ASTM D1141, and added acetic acid to this artificial seawater, and adjusted it to pH3.
  • test conditions were 0.5 hour spray-wet 1.5 hour as one cycle, and this cycle was repeated to conduct an external surface anticorrosion evaluation test for three levels of 10 days, 20 days, and 30 days. did. Note that the flat multi-hole tubes T40 and T43 in which the melting of the base material was significantly observed at the time of brazing heating were excluded from the test target.
  • the test material surface was put into a phosphoric acid chromic acid solution heated at a heater.
  • the corrosion product was removed, and the presence or absence of through-holes on the surface of the test material was examined.
  • a highly penetrable colored flaw detection liquid is dropped into each flow path of the flat multi-hole tube, and the penetration hole is confirmed by a method of confirming the exudation of the flaw detection liquid from the inner surface of the flat multi-hole pipe. The presence or absence was examined.
  • Tables 13 and 14 below evaluate the SWAAT test for 10, 20, and 30 days for flat multi-hole tubes T1 to T37 and flat multi-hole tubes T38, T39, T41, T42, and T44 to T55. The results are shown respectively.
  • the flat multi-hole tubes T1 to T37 had no through-holes penetrating the outer peripheral wall portion (14) in the evaluation after 10 days of the SWAAT test. Further, in the evaluation after 20 days, through holes penetrating the outer peripheral wall portion (14) were confirmed in the flat multi-hole tubes T11, T13 to T15, T18, T19, T21, T27, T29, and T31 to T37. . Furthermore, in the evaluation after 30 days, through holes penetrating the outer peripheral wall portion (14) of the flat multi-hole tube excluding T1, T16 and T20 were observed. Therefore, it was recognized that all of the flat multi-hole tubes T1 to T37 were effectively protected from the outer surface by the sacrificial anode effect due to the presence of the sacrificial anode / brazing material portion (18).
  • the flat multi-hole tubes T38, T39, T55 shown in Table 14 are flat multi-hole tubes using only the tube body material similar to the conventional material without using the sacrificial anode / brazing material.
  • SWAAT test was carried out on the 10th, 20th and 30th, it was recognized that corrosion holes penetrating the outer peripheral wall of the pipe were formed in all the evaluations after the test.
  • the sacrificial anode / brazing material portion (18) does not exist on the outer peripheral wall of the tube as in the flat multi-hole tube according to the present invention, so the sacrificial anode effect cannot be obtained and the outer surface anticorrosion effect cannot be exhibited.
  • penetration occurred early it was recognized that penetration occurred early.
  • the flat multi-hole tubes T41, T42, T44 to T55 shown in Table 14 were subjected to the SWAAT test similar to the above on the 10th, 20th and 30th. It was observed that corrosion holes were generated. All of the through portions were confirmed in the region of the outer peripheral wall portion of the pipe where the sacrificial anode / brazing material portion (18) was not formed. This is because, like the flat multi-hole tubes T38, T39, T55, the sacrificial anode / brazing material portion (18) does not exist on the outer peripheral wall portion (14), so that the sacrificial anode effect cannot be obtained and the outer surface It was recognized that penetration occurred early because the anticorrosion effect could not be exhibited.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Geometry (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Extrusion Of Metal (AREA)

Abstract

La présente invention concerne un tuyau perforé plat en aluminium extrudé présentant d'excellentes propriétés de brasage et une excellente résistance à la corrosion de surface extérieure dans la section circonférentielle externe du tuyau. Le tuyau perforé plat (10) en aluminium extrudé est formé par extrusion simultanée d'un matériau de corps principal du tuyau en aluminium et d'un matériau de brasage/anode sacrificielle plus basique sur le plan électrochimique, contenant un alliage d'aluminium à base d'Al-Si-Zn, une section (18) de matériau de brasage/anode sacrificielle étant formée par exposition du matériau de brasage/anode sacrificielle autour de la totalité de la section de paroi circonférentielle extérieure du tuyau ou d'au moins une partie de la section plate de la section de paroi circonférentielle extérieure du tuyau.
PCT/JP2018/004423 2017-02-13 2018-02-08 Tuyau perforé plat en aluminium extrudé présentant d'excellentes propriétés de brasage et une excellente résistance à la corrosion de surface extérieure, et échangeur de chaleur en aluminium réalisé à partir de celui-ci Ceased WO2018147375A1 (fr)

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JP2018567493A JPWO2018147375A1 (ja) 2017-02-13 2018-02-08 ろう付け性及び外面防食性に優れたアルミニウム押出扁平多穴管及びそれを用いてなるアルミニウム製熱交換器
CN201880011516.2A CN110291355A (zh) 2017-02-13 2018-02-08 钎焊性及外表面防腐蚀性优异的铝挤出扁平多孔管及使用其而成的铝制热交换器
DE112018000797.9T DE112018000797T5 (de) 2017-02-13 2018-02-08 Stranggepresste flache perforierte Aluminiumröhre mit hervorragenden Hartlöteigenschaften und Außenoberflächenkorrosionsbeständigkeit, und unter Verwendung davon erhaltener Aluminiumwärmetauscher

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WO2020196763A1 (fr) * 2019-03-26 2020-10-01 三菱マテリアル株式会社 Tube de brasage, son procédé de fabrication et échangeur de chaleur
WO2022050030A1 (fr) * 2020-09-02 2022-03-10 株式会社Uacj Tube extrudé d'alliage d'aluminium et échangeur de chaleur

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