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WO1986004099A1 - Procede de protection contre la corrosion d'elements metalliques enrobes d'un manteau de protection - Google Patents

Procede de protection contre la corrosion d'elements metalliques enrobes d'un manteau de protection Download PDF

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Publication number
WO1986004099A1
WO1986004099A1 PCT/AT1986/000006 AT8600006W WO8604099A1 WO 1986004099 A1 WO1986004099 A1 WO 1986004099A1 AT 8600006 W AT8600006 W AT 8600006W WO 8604099 A1 WO8604099 A1 WO 8604099A1
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WO
WIPO (PCT)
Prior art keywords
electrode
conductive
plastic
layer
potential
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/AT1986/000006
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German (de)
English (en)
Inventor
Hans Oppitz
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.)
Eltac Nogler und Daum KG
Original Assignee
Eltac Nogler und Daum KG
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 Eltac Nogler und Daum KG filed Critical Eltac Nogler und Daum KG
Publication of WO1986004099A1 publication Critical patent/WO1986004099A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F2201/00—Type of materials to be protected by cathodic protection
    • C23F2201/02—Concrete, e.g. reinforced

Definitions

  • the invention relates to a method and a device for preventing the corrosion of metal parts which are embedded over their longitudinal course in a protective jacket and are exposed to different pH values, with one at the negative and one at the positive electrical potential of one used as an active corrosion protection system Direct voltage source applied electrode.
  • DC source connected to a pipeline laid in the ground.
  • protective anodes for example iron protective anodes with coke coating
  • Corrosion protection systems of this type were able to reduce corrosion on pipelines, but in many cases they could not be prevented.
  • Another known electrically operated (active) corrosion protection system - according to GB-OS 2140456 - has a DC voltage source, the positive potential of which is present at a thin, permanent, non-corrodible anode made of strips, rods, wires or nets. These anodes are fixed to the concrete surface with an epoxy adhesive and then coated with a conductive paint.
  • the negative potential of the DC voltage source is due to the reinforcement formed by metal parts.
  • the electric field formed between the anode and the cathode is intended to coincide with the one flowing in the field
  • the object of the present invention is to protect metal parts embedded in protective sleeves from corrosion, in particular by means of concentration elements, that is to say galvanic elements with electrodes made of the same type of metal in different types of electrolyte.
  • This object of the invention is achieved in that the electrode present at the positive potential is contacted over a large area with the surface of the protective sheath enveloping the metal parts, and the output of the DC voltage source present at the negative potential is connected to the metal parts. and or or is grounded.
  • the surprising advantage of this solution lies in the fact that, through the arrangement of the electrode (anode) present at the positive potential, a precisely defined electric field between the metal parts embedded in the protective sheath or structure and the surface of the protective sheath or structure is formed.
  • the expansion of the electrode applied to the positive potential over a larger surface of the protective jacket or of the structure achieves an intensive, large-scale field structure, the parameters of which it is based can be determined fairly precisely, since the material, the composition, the conductivity or the specific resistance of the material of the protective jacket or the structure and the distance between the electrode present at the positive potential and the metal parts is usually known exactly.
  • Another surprising advantage of this solution according to the invention is that the cations of the salts, such as chlorides and the like, migrate to the anode and are excreted by efflorescence in the region of the anode. As a result, they can no longer influence the corrosion process in the area of the metal parts.
  • the negative potential or the electrode applied to the negative potential namely the cathode
  • the negative potential or the electrode applied to the negative potential is arranged in the foundation area - in the case of bridges, preferably in the area of the foundation points of the supports. This results in a large-scale field build-up between the anode connected to the positive potential and the ground receiving the foundations, which means that, in accordance with the basic electro-osmotic laws, the water molecules are transported and thus moisture is transported in the direction of the Area of the foundations arranged soil.
  • a layer of a conductive, in particular adhesive, plastic is applied to the surface of the protective covering, whereupon a broken or reticulated electrode is placed on this layer and this is connected with another Layer of a conductive plastic is painted over, the layers in the area of the openings or mesh openings of the electrode being connected to one another and to the electrode, and the conductive plastic having a pore size which enables water vapor diffusion.
  • the electrode at the positive potential on the bridge structure is preferably on the Surface of the protective covering facing away from the road surface is applied, the electrode in the case of reinforced concrete bridges preferably being arranged approximately centrally between two support points and the negative potential in the area of the foundations and / or support points being applied to earth and, if appropriate, to the metal parts.
  • the electrode in particular the metal parts contained in the protective jacket have exclusively negative potential, the protective jacket of the metal parts being maintained and the corrosion being avoided by the cations migrating in the direction of the cathode.
  • the invention also encompasses a device for preventing the corrosion of metal parts which are embedded over their longitudinal course in a protective jacket and are exposed to different pH values, with a DC voltage source and an electrode which is in each case present at the positive and negative electrical potential of this DC voltage source for carrying out the Procedure.
  • the device is characterized in that the electrode is formed by a layer of conductive plastic and this conductive layer is applied to part of the protective jacket and is connected to the output connected to the positive potential of the direct voltage source.
  • the electrode is formed by a layer of conductive plastic and this conductive layer is applied to part of the protective jacket and is connected to the output connected to the positive potential of the direct voltage source.
  • the voltage present at posi ⁇ tive potential electrode embedded one in the conductive layer provided with openings' Fl chenlei ⁇ ter, for example comprising a network, whereby between the expansions of the structure and an electrode, a reliable ssige transmission the voltages or a current transfer is achieved in order to enable a flawless field construction.
  • the openings in the surface conductor ensure a full contact and good contact between the electrode and the protective jacket.
  • the surface provided with openings may be constructed as a sandwich element which has a conductive film between two insulation layers and the conductive film is connected directly to the interior of the openings in the region of the openings.
  • a very resistant surface conductor is formed against mechanical stress, which enables the conductive plastic layer and thus the surface of the protective jacket to be contacted via the many connection points in the area of the openings in the surface conductor.
  • the electrode present at the positive potential in a structure extending between two abutments connected to the ground is arranged approximately centrally between support points and the electrode present at the negative potential in the area of the foundations or is grounded, whereby it is achieved that an equally strong electric field builds up on both sides from the center in the direction of the supports or the ground, thus ensuring that the electric field covering the structure is subject to a movement of moisture or liquid Direction of the foundations causes, at the same time the metal parts in any case have negative potential (cathode).
  • the electrode connected to the positive potential is arranged in the area of the upper end facing away from the ground in a structure supported on a central foundation and extending upwards from it perpendicularly to the surface of the earth , because in this case the movement of moisture in the protective jacket is given a clear direction and undesired moisture penetration is stopped.
  • the electrode connected to the positive potential is arranged at a dam on the side facing away from the pent-up water, in particular up to the level of the maximum fill level.
  • the arrangement of the electrode in the position according to the invention ensures that the surfaces of the dam walls that are not in contact with the water have a low level of moisture, at least up to the dew point within the dam wall, and frost breakdowns in the Prevents surface of the dam.
  • the insulation layers and the end faces of the openings of the sheet-like electrode designed as a sandwich element are coated with an electrically conductive plastic and that these are connected to the structure or the protective jacket via the electrically conductive plastic, and the End faces of the conductive foil in the area of the openings are contacted with the electrically conductive plastic applied to the structure or the protective jacket.
  • the materials of the individual layers of the sandwich element and of the conductive layers made of plastic have a small potential gap in the electrochemical voltage series of the metals, and preferably the conductive layer of the sandwich element is made of aluminum and the plastic layers of an im essential ion-free thermoset mixed with carbon or graphite, for example with a macromolecular structure.
  • the surprising advantage of using electrodes or layers of plastic designed in this way is that the build-up of electrochemical or galvanic elements between the individual layers of the electrode can be switched off and the service life of the electrodes can thus be increased.
  • the plastic of the conductive layer to be essentially ion-free and preferably to be designed in the manner of a styrofoam with a macromolecular structure, for example an acrylate, with at least partially crosslinked polymers, as a result of which the plastic material can also be ⁇ does not age as an electrode, since the plastic structure is not influenced or destroyed by the ion migration.
  • a macromolecular structure for example an acrylate
  • the conductive plastic contains synthetic resin solutions or synthetic resins mixed with metal or semi-metallic compounds or their solutions in an amount, so that approximately one metallic or semi metallic material comes onto a synthetic resin molecule and that after mixing with the addition of reducing agent in a slight excess or by known thermal decomposition containing metal or semimetal atoms and in which the ions formed or still present are washed out and the dispersions, solutions or granules are further processed with graphite or carbon black are, preferably graphite powder is added to the conductive plastic, whereby a semiconductor material is formed which is resistant to the external environmental influences and is well suited for building up a large-scale electrical field.
  • the plastic is water-repellent and to have pores with a pore size that allow water vapor to pass through the layer, which means that even with closed, large-area coatings with the conductive plastic as an electrode, water vapor diffusion and thus a blooming of salts is possible and perfect adhesion between the electrode and the surface of the protective jacket can be maintained for a long time.
  • FIG. 1 shows a side view of a bridge, in which the metal parts formed by the reinforcement are arranged in a protective jacket formed from concrete, and the associated device according to the invention for preventing the corrosion of the reinforcement in a simplified schematic representation;
  • Figure 2 shows the bridge in front view cut along the lines II - II in Fig.l.
  • FIG. 3 shows a part of a protective jacket with metal parts arranged in it in the area of an electrode applied to its surface, partly in a diagrammatic representation
  • FIG. 4 shows a section through the Sj: hu ⁇ zmantel with the electrode arranged thereon according to lines IV-IV in FIG. 3;
  • FIG. 5 shows a protective jacket with metal parts arranged therein and another embodiment of an electrode, also partially cut in a diagrammatic representation
  • FIG. 6 shows a device according to the invention for preventing the corrosion of metallic components on a dam in a simplified schematic representation.
  • a bridge 1 which consists of a prestressed concrete construction.
  • the concrete 2 forms a protective jacket 3 for the reinforcements 5 contained in the concrete, which are formed by metal parts 4.
  • a device 6 is provided in areas of the metal parts in the moist concrete serving as electrolyte.
  • the device 6 for preventing corrosion and the metal parts comprises a direct voltage source 7, the positive potential of which is present at an output 8 and the negative potential of which is present at an output 9.
  • the output 8 is connected to an electrode 11 arranged essentially centrally between support points 10 of the bridge 1.
  • the output 9 connected to the negative potential of the DC voltage source is grounded or contacted via a line 12 with the reinforcement 5 or a metal part 4 thereof.
  • an electrode 11 serving as an anode is arranged on a surface 13 of the bridge 1, in particular on an underside or the side walls of the supporting body of the bridge opposite a roadway 14.
  • This electrode 11 consists of a layer 15 of a conductive plastic 16, for example an ion-free duroplastic with a macromolecular structure, which is mixed with graphite to increase the conductivity.
  • a conductive plastic 16 for example an ion-free duroplastic with a macromolecular structure, which is mixed with graphite to increase the conductivity.
  • Plastics are known for example from AT-PS 313 588 one of the two applicants.
  • the main advantage of using such conductive plastics for the conductive layer 15 is that they have a high resistance to aging even when exposed to electrical currents. Especially when exposed to moisture, no ion conduction can occur, and destruction of the plastic is thus prevented.
  • the metal parts 4 forming the reinforcement 5 are embedded in the concrete 2.
  • potassium hydroxide, Ca (OH) 2 is formed and a strongly alkaline solution with pH values greater than 12.5 forms in the pore water of the concrete.
  • metal parts, in particular made of steel are protected from corrosion by a thin oxidic covering layer (solid layer).
  • the concrete 2 forms a protective jacket 3, i.e. a secondary mechanical protection against injuries to this solid layer and at the same time also prevents - at least in the case of dense concrete - the penetration of aggressive substances up to the reinforcement 5.
  • the pH value in the area of the reinforcement 5 drops. If aggressive substances such as chlorides penetrate through the carbonized surface, for example chlorides through salt scattering or the like, the oxidic covering layer of the Steel is dissolved and there is a formation between those areas in the reinforcement 5 or the metal parts 4 in which this oxidic cover layer is dissolved and those where the oxidic cover layer still has a high pH due to the strongly alkaline solution a galvanic element, whereby the moisture in the concrete forms the electrolyte.
  • This type of galvanic elements made of the same type of metal in different electrolytes - which are formed by the same electrolyte, namely moisture in the concrete, but with a different pH - does not arise from the potential difference of different metals according to the voltage series, but ⁇ due to the heterogeneous composition of the electrolytes, essentially as a result of concentration differences that can occur with similar electrolytes.
  • concentration elements are commonly referred to as concentration elements.
  • the current flowing in the electrical field 17 - which is schematically indicated by field lines 18 - which is also referred to as a protective current - is relatively small in the present case, since with a high conductivity of the electrolyte formed by the moisture in the concrete, a cathodically controlled corrosion is present. Due to the low electrolyte resistance, there is a need for protective current, which can only be approximately the same as the corrosion current of the galvanic elements acting in the absence of an electrical field.
  • Another advantage which is achieved by the establishment of a directed electric field is that the negative ions of the penetrating chlororyde or salts through the electric field in the direction of the electrode 11 applied to the positive potential, that is to say the anode, hike and bloom there.
  • the conductive plastic has 16 pores, the pore size of which is sufficient for water vapor diffusion and thus a blooming out of the negative To enable ions, that is, the salts and the like.
  • the cations ie the positive metal ions, such as K + , Na + , Ca, on the other hand, migrate to the negatively charged metal parts or to the electrode at the negative potential in the area of the foundations or the soil surrounding the foundations. This movement of the liquid is due to the fact that an electrical potential jump generally occurs at the contact surface of two different substances. Electrons transfer from one medium to another. This can be explained by the different electrical attraction of the atoms to the electrons. According to Coehn's law of charge, the body charges negatively with the smaller dielectric constant.
  • the soil particles can be seen as held in place while the water molecules can move freely. If an external electric field is applied in the water-filled soil, the positive charge carriers of the water move along the field lines and migrate to the cathode. That means an electric current and at the same time a liquid flow. Due to the built-up electrical field, the effect described above is used to discharge the moisture or liquid from the reinforced concrete structure or structure into the ground or foundation. Thus, the 'building next to the achieved corrosion protection for the reinforcement parts can be kept dry.
  • the field direction in the electrical field also prevents the formation of local elements between the electrolyte and the reinforcement elements, since the differential voltage between the reinforcement materials and the electrode present at the negative potential is insufficient to cause corrosion on the reinforcement elements.
  • the electric field can be established by using a DC voltage source 7.
  • a DC voltage source 7 instead of a power supply unit with which the corresponding low voltage is generated by a high-voltage supply, it is also possible to use solar collectors or magnesium anodes in order to apply the electrode 11 to a positive potential, so that it acts as an anode. If one is used as the conductive plastic, as described in AT-PS 313588, then a connection to a direct voltage source or to a positive potential can be dispensed with, since the semiconductor properties of this material make the electrode 11 accepts positive potential.
  • FIG. 3 shows another embodiment of an electrode 19 which is connected to the positive potential of a DC voltage source 7.
  • This consists of a layer 20 applied to the surface 13 of a protective jacket 3 and of an electrically conductive plastic 21.
  • a surface conductor 22 is applied to this layer 20, which is constructed as a sandwich element and comprises a conductive film 23 which is between two insulation layers 24 is arranged. Openings 25 are provided in the surface conductor 22, in which the conductive film 23 is directly connected to the interior of the openings, ie, is not covered by the insulation layers 24.
  • the surface conductor 22 is ⁇ then in turn an electrically conductive plastic material 21 with a further layer 26 - which may be in this by the same conductive plastic as the layer 20 - covered, wherein the end sides of the openings 25 with the plastic 21 covered and the plastic 21 of the layer 26 with which the layer 20 is contacted.
  • the electrically conductive plastic 21 is thus connected to the positive potential of the DC voltage source 7 via a large number of contact points, and a large-area electrode is created which, even in the event of vibrations or interruptions in individual line connections, provides a flat voltage supply and thus the occurrence of current and Avoid voltage peaks in the region of the electrode or the electrical field 17 built up by the electrode, which is again schematically indicated by field lines 18.
  • 3 shows the covering of the end faces of the openings 25 by the electrically conductive plastic 21 of the layer 26 on the basis of the section through the electrode 19 in FIG. This layer 26 also provides the contacting or voltage and current feed to the layer 20.
  • FIG. 5 shows another embodiment variant of an electrode 27, which is also applied to a surface 13 of a protective jacket 3 of a building body.
  • the surface conductor 22 for supplying voltage or current is formed in a layer 28 made of conductive plastic applied to the surface 13 by a network 29 made of electrically conductive materials.
  • This network can be formed, for example, from plastic or carbon or metal fibers, the voltage spacing of which in the electrochemical voltage series is small from the carbon of the plastic surrounding it.
  • This network 29 is embedded in the layer 28 made of electrically conductive plastic or, as described with reference to FIGS. 3 and 4, a further layer 26 made of electrically conductive plastic is applied in order to ensure sufficient contact between the surface of the conductive network 29 and the conductive layer 28 arranged on the surface 13 of the protective jacket 3.
  • Electrodes 11, 19 and 27 are on the foundation to arrange the most distant area of a building in order to obtain a clearly defined electrical field directed against the foundation, in which the negative potential lies in the area of the ground.
  • a dam 30 is shown in FIG. 6, which is used to back up water 31.
  • An electrode 33 according to the invention is arranged on a surface 32 of the dam facing away from the water 31, which is connected to the positive potential of a DC voltage source 7 and serves as an anode.
  • the negative potential of the DC voltage source 7 is grounded, so that metal parts 34, which form the reinforcement of the dam 30, assume negative potential.
  • the moisture migrates in the direction of the negatively charged areas, that is to say the surface of the dam 30 which is wetted with the water 31, so that a zone 35 made visible by hatching is created in the dam 30 and is kept dry by the action of the electric field , so that frost damage in the surface 32 of the dam 30 is prevented, in particular at ambient temperatures in the region of the dam 30 which are below the freezing point.
  • the electrical field which is formed by means of the electrode 33, thus provides protection against corrosion and, at the same time, surface protection of such dams 30.
  • the application of the method or the use of such a protective device is of course not restricted to dam walls, but can also be used, for example, for any other structures that come into contact with water on one side and with air on the other side , Find application.
  • the electrode at the positive potential has a large area is connected to a surface of the building.
  • conductive silicates or similar conductive materials for the conductive layers or electrodes instead of the conductive or semi-conductive plastic.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Prevention Of Electric Corrosion (AREA)

Abstract

Procédé et dispositif pour empêcher la corrosion d'éléments métalliques qui sont enrobés longitudinalement d'un manteau de protection et qui sont exposés à différentes valeurs de pH. Les électrodes sont placées l'une au potentiel positif, l'autre au potentiel négatif d'une source de tension continue utilisée comme dispositif actif de protection contre la corrosion. L'électrode placée au potentiel positif est connectée par une grande surface à la surface du manteau entourant les éléments métalliques. La borne négative de la source de tension continue est reliée aux éléments métalliques et/ou mise à la terre.
PCT/AT1986/000006 1985-01-14 1986-01-14 Procede de protection contre la corrosion d'elements metalliques enrobes d'un manteau de protection Ceased WO1986004099A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0006885A AT387990B (de) 1985-01-14 1985-01-14 Korrosionsschutzverfahren fuer in einem schutzmantel eingebettete metallteile und vorrichtung zur durchfuehrung des verfahrens
ATA68/85 1985-01-14

Publications (1)

Publication Number Publication Date
WO1986004099A1 true WO1986004099A1 (fr) 1986-07-17

Family

ID=3480678

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AT1986/000006 Ceased WO1986004099A1 (fr) 1985-01-14 1986-01-14 Procede de protection contre la corrosion d'elements metalliques enrobes d'un manteau de protection

Country Status (6)

Country Link
EP (1) EP0245265A1 (fr)
AT (1) AT387990B (fr)
AU (1) AU5356086A (fr)
CH (1) CH661941A5 (fr)
DE (2) DE3690002D2 (fr)
WO (1) WO1986004099A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989010435A1 (fr) * 1988-04-19 1989-11-02 Michael George Webb Procede anti-corrosion applicable au beton arme
WO1992011399A1 (fr) * 1990-12-18 1992-07-09 Coating A.S. Procede pour la renovation d'ouvrages avec des elements metalliques inseres dans ces derniers
EP0581433A1 (fr) * 1992-07-21 1994-02-02 Zeneca Inc. Système de protection cathodique comprenant un revêtement électro-conducteur et composition de revêtement pour celui-ci
US5650060A (en) * 1994-01-28 1997-07-22 Minnesota Mining And Manufacturing Company Ionically conductive agent, system for cathodic protection of galvanically active metals, and method and apparatus for using same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU605015B2 (en) * 1988-01-04 1991-01-03 Norwegian Concrete Technologies A.S. Method to stop alkali-aggregate reactions in concrete etc., and means to carry out this method
WO2025158259A1 (fr) * 2024-01-26 2025-07-31 Metalnastri S.R.L. Anode galvanique pour structures en béton renforcées avec un électrolyte ayant un ph compris entre 5,5 et 7,5

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0085582A1 (fr) * 1982-02-05 1983-08-10 Harco Corporation Protection cathodique utilisant un béton polymère conducteur
GB2140456A (en) * 1982-12-02 1984-11-28 Taywood Engineering Limited Cathodic protection
EP0147977A2 (fr) * 1983-12-13 1985-07-10 RAYCHEM CORPORATION (a California corporation) Anodes pour la protection cathodique

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT313588B (de) * 1970-08-24 1974-02-25 Oppitz Hans Verfahren zur Herstellung von elektrisch leitenden Verbundwerkstoffen
AT375709B (de) * 1982-08-16 1984-09-10 Oppitz Hans Verfahren zur elektroosmotischen trockenlegung von mauerwerk od. dgl.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0085582A1 (fr) * 1982-02-05 1983-08-10 Harco Corporation Protection cathodique utilisant un béton polymère conducteur
GB2140456A (en) * 1982-12-02 1984-11-28 Taywood Engineering Limited Cathodic protection
EP0147977A2 (fr) * 1983-12-13 1985-07-10 RAYCHEM CORPORATION (a California corporation) Anodes pour la protection cathodique

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989010435A1 (fr) * 1988-04-19 1989-11-02 Michael George Webb Procede anti-corrosion applicable au beton arme
WO1992011399A1 (fr) * 1990-12-18 1992-07-09 Coating A.S. Procede pour la renovation d'ouvrages avec des elements metalliques inseres dans ces derniers
EP0581433A1 (fr) * 1992-07-21 1994-02-02 Zeneca Inc. Système de protection cathodique comprenant un revêtement électro-conducteur et composition de revêtement pour celui-ci
US5364511A (en) * 1992-07-21 1994-11-15 Zeneca Limited Cathodic protection system and a coating and coating composition therefor
US5431795A (en) * 1992-07-21 1995-07-11 Thoro Systems Products Inc. Cathodic protection system and a coating and coating composition therefor
US5650060A (en) * 1994-01-28 1997-07-22 Minnesota Mining And Manufacturing Company Ionically conductive agent, system for cathodic protection of galvanically active metals, and method and apparatus for using same

Also Published As

Publication number Publication date
AT387990B (de) 1989-04-10
CH661941A5 (de) 1987-08-31
AU5356086A (en) 1986-07-29
EP0245265A1 (fr) 1987-11-19
DE3690002C1 (de) 1997-01-09
DE3690002D2 (en) 1987-12-10
ATA6885A (de) 1988-09-15

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