CN1222585A - metal surface treatment method - Google Patents

Abstract

A method for treating the surface of metal pot includes such steps as sand blasting to generate uneven surface, treating by phosphate film to prevent rust and increase adhesion of substrate, adhering fluoric resin to the film, heating, baking and sintering.

Description

metal surface treatment method

The invention relates to a metal surface treatment method, in particular to a metal surface treatment method for pots and utensils.

The current metal surface treatment generally requires different methods according to its use, and there are too many products used in the industry, that is, as far as the pots and utensils used in the home kitchen are concerned, the materials used are nothing more than iron, Aluminum, stainless steel and other metals are widely used for frying, frying, boiling and frying. The surface treatment is TEFLON (or fluorine resin processing). Its structure and processing method are shown in Figure 6. , as shown in Figure 7, in order to obtain a good fluororesin 51 attached to the pot surface 5, the concave hole 52 must first be impacted on the metal surface. At present, this kind of sandblasting treatment generally uses glass sand with a particle size of 60#-100# Or aluminum oxide single spraying, so that the depth of about 10-25μm is formed on the surface of the pot, so that the sprayed fluorine resin 51 can be effectively attached, and after drying, it is heated and dried to solidify and harden, while the fluorine resin of Teflon The advantage of the 51 layer of plain resin is that it can make the metal pan have good non-stick (sticky) performance, so that the food is not easy to burn (roast) and is easier to clean. And it is small and flat, so that the sprayed fluororesin 51 has poor adhesion and is easy to fall off. Therefore, although its characteristics are non-stick, the poor combination makes it not wear-resistant, so the service life is not long. As shown in Figure 8, when a metal spatula is rubbed in the pot, the fluororesin 51 will be worn and peeled off in a block quickly, and the original layer of the metal pot will appear again, losing its original effectiveness. biggest fatal injury

In view of the unsatisfactory and practical defects of the aforementioned metal pan structure and manufacturing method, the inventor has accumulated many years of professional manufacturing experience, actively researched, designed and developed, and in order to make the present invention play a better industrial value During this period, after many trials and improvements, a revolutionary metal surface treatment method was finally completed to apply to the pot and improve its current defects.

The main purpose of the present invention is to provide a metal surface treatment method, which utilizes (Teflon) fluorine resin non-stick and anti-adhesive properties to strongly bond the resin to the metal surface so that it does not fall off and keeps its performance and service life.

In order to achieve the above object, the manufacturing method of the present invention is to use steel grit, steel ball or steel gravel or the mixture of the three with uneven thickness, and to impact the metal surface with high pressure for sandblasting, so that three kinds of marks are produced on the surface, which are different in depth and thickness. Uneven concave-convex surface, and then treated with phosphate film to prevent rust, corrosion and strengthen the adhesion with fluororesin, and then spray (Teflon) fluororesin on the phosphating film with good porosity and absorption On the surface, the fluororesin can be fully impregnated into the crevices at the bottom of the valley with uneven thickness and different shapes, and then heated and dried to shape after drying. Or change the sandblasting treatment to degrease the metal first, then roughen the surface with an acid-base etchant, and then perform subsequent treatment.

A metal surface treatment method, formed by sandblasting, phosphate film treatment, fluorine resin processing and heating and drying, characterized in that:

(1) Sand blasting treatment: thick and fine steel sand or steel balls or steel gravel with sharp angles or a mixture of the three, high-pressure impact blasting on the surface of the metal, making it produce different diameters, depths, unevenness, uneven thickness and shape Messy pits;

(2) Phosphate film treatment: degrease a small amount of oil before the film is formed, and add manganese phosphate, zinc phosphate or iron phosphate salts plus surfactants and accelerators, without affecting the physical properties of the metal substrate body Next, the surface of the metal substrate is dissolved, and on the one hand, a layer of messy fine rough surface is formed at the same time, that is, a film layer is formed. The process is as follows: degreasing→water washing→water washing→drying→surface adjustment and roughening→phosphate film treatment →Water washing→Water washing→Hot water washing→Drying→Painting; the treatment conditions are between PH4-6, 40-60℃, about 5-10 minutes by dipping or spraying, and the next step must be carried out in a short time after drying ;

(3) Processing of fluororesin: Spray fluororesin in suspended state with different number of combinations on the surface of the concave hole with phosphate coating, so that the fluororesin can be fully impregnated into the concave holes with uneven thickness. In the gap of Kongbo Valley, it is firmly attached to the surface of the skin membrane;

(4) Heating and drying molding: After the fluororesin is dried, it is heated in a furnace to make the particles dissolve and combine with each other and solidify and harden.

A metal surface treatment method, formed by chemical etching, phosphate film treatment, fluorine resin processing and heating and drying, characterized in that:

(1) Chemical etching: its etchant can be divided into acid and alkali, among which acid etching is a mixture of acidic ammonium fluoride 200g/l plus sulfuric acid or nitric acid 100g/l at 25-40°C for 60-100 seconds , or mixed with ammonium fluoride 50-150g/l and ammonium sulfate in an appropriate amount, etched at room temperature for 2-3 minutes, and for alkali etching, use a mixture of 200g/l sodium hydroxide and 250g/l sodium nitrate at 65- It is etched at 80°C for 30-60 seconds, or mixed with sodium hydroxide 50-100g/l and sodium fluoride 20-40g/l, and etched at 60-80°C for 1-3 minutes;

(2) Phosphate film treatment: degrease a small amount of oil before the film is formed, and add manganese phosphate, zinc phosphate or iron phosphate salts plus surfactants and accelerators, without affecting the physical properties of the metal substrate body Next, the surface of the metal substrate is dissolved, and on the one hand, a layer of messy fine rough surface is formed at the same time, that is, a film layer is formed. The process is as follows: degreasing→water washing→water washing→drying→surface adjustment and roughening→phosphate film treatment →Water washing→Water washing→Hot water washing→Drying→Painting; the treatment conditions are between PH4-6, 40-60℃, about 5-10 minutes by dipping or spraying, and the next step must be carried out in a short time after drying :

(3) Processing of fluororesin: Spray fluororesin in suspended state with different number of combinations on the surface of the concave hole with phosphate coating, so that the fluororesin can be fully impregnated into the concave holes with uneven thickness. In the gap of Kongbo Valley, it is firmly attached to the surface of the skin membrane;

(4) Heating and drying molding: After the fluororesin is dried, it is heated in a furnace to make the particles dissolve and combine with each other and solidify and harden.

A metal surface treatment method is characterized in that: a concave-convex structure with different shapes is formed on the metal surface, a layer of phosphate film is attached inside, and a layer of fluorine resin is adhered to the phosphate film.

Sand blasting uses strong compressed air of 5-15kg/cm, sprayed by nozzles or blasted by the strong centrifugal force of the blower blades running at high speed, impacting and blasting on the surface of the metal, making it produce a diameter of about 0.5-1.5m/m , 30-80μm deep concave hole is better.

After phosphate film treatment, it is better to form a phosphating film of 1-2.5g/m2.

Fluorine resin is heated and dried in the furnace for about 5 minutes at a temperature of about 120°C, and then adjusted to a temperature of 300-450°C for 5-10 minutes.

The treatment of the present invention is processed on the surface of metals such as iron, aluminum or stainless steel, and the effect is good, especially in the embodiment of the pot, and it can also be applied to other industrial purposes, such as mold production The ball mold or shoe mold in the mold needs to be better in mold release, and this surface treatment can also be done. Therefore, anyone who is familiar with this technology and derivative products in this technical field should belong to the scope of the present invention. When understandable.

What the inventor wants to emphasize is that it is not the first time that the present invention proposes to simply process fluorine resin on the surface of the metal, especially the surface of the pot. Adhesion is not proposed for the first time in the present invention, but the above-mentioned detailed procedures including phosphate film treatment and fluororesin processing, combined with different manufacturing conditions, are used in metal surface treatment, especially on the surface of pots and utensils. Processing, this integral manufacturing method is proposed by the present invention, and this structure is also innovative. Therefore, the metal surface treatment method provided by the present invention and the resulting structure are completely different from the prior art, and can achieve the expected purpose of the invention. It is not only practical and highly progressive, but also has more development value in industrial utilization.

The manufacturing process and its structural features, performance and purpose of the present invention will be further described below in conjunction with the accompanying drawings and accessories and with the cooker as an example.

Fig. 1 is a schematic cross-sectional view of a metal after sandblasting in the present invention.

Fig. 2 is a schematic cross-sectional view of a metal after phosphating film treatment according to the present invention.

Fig. 3 is a schematic cross-sectional view of the finished spraying and sintering of the fluororesin of the present invention.

Fig. 4 is a schematic cross-sectional view of the structure of the present invention after operating with a spatula for a period of time.

Fig. 5 is that the present invention generates phosphate film section model diagram

Fig. 6 is a schematic cross-sectional view of a metal surface after sandblasting treatment in the prior art.

Fig. 7 is a schematic cross-sectional view of the fluororesin spraying and sintering in the prior art.

Fig. 8 is a schematic cross-sectional view of the structure of the surface of the metal pan in the prior art after being operated with a spatula.

Fig. 9 is a synthetic photo of the images of the sandblasted surface with uneven surface thickness of the pot according to the present invention.

Fig. 10 is the composite photograph of the image of the metal surface after the phosphating film treatment on the surface of the pan according to the present invention

Fig. 11 is an enlarged view of composite photos of metal surface after chemical etching on the surface of the pot according to the present invention.

Fig. 12 is an enlarged view of composite photos of the surface of the cooker according to the present invention after being used for a long time.

Please refer to Fig. 1 and shown in Fig. 9, the manufacturing procedure of the present invention is as follows:

(1) Sand blasting treatment: In order to improve the adhesion of fluororesin, choose coarse and fine steel sand or steel balls or steel gravel with sharp angles or a mixture of the three, and use 5-15kg/cm strong compressed air to spray through the nozzle or use The strong centrifugal force of the blower blades running at high speed impacts and blasts the surface of the metal 1, making it produce three kinds of mixed traces with a diameter of about 0.5-1.5m/m and different depths of 30-80μm. Concave holes 11 with uniform and chaotic shapes, of course, the surface can also be sprayed with steel sand, steel balls or steel gravel separately.

(2) Phosphate film treatment: as shown in Figure 2 and Figure 5, degrease a small amount of oil before the film is formed, then add manganese phosphate, zinc phosphate or iron phosphate salts to add surfactants and accelerators, Without affecting the physical properties of the metal substrate body, the surface of the metal substrate is dissolved. On the one hand, a layer of messy fine rough surface is formed at the same time, that is, a phosphating film (12) layer of 1-2.5g/m is formed. , (as shown in Figure 10) its process is roughly as follows:

Degreasing→water washing→water washing→drying→surface roughening→phosphate film treatment→water washing→water washing→hot water washing→drying→painting

The treatment conditions are about PH4-6, between 40-60°C, about 5-10 minutes by dipping or spraying, and the next step must be carried out in a short time after drying.

More specifically, phosphate film treatment was originally researched for the antirust treatment of steel materials. It is applied to the bottom layer before metal coating to prevent rust, and to increase the corrosion resistance and adhesion of the substrate. There is a kind of intramolecular attraction, so it has a good adhesion effect on the coating. Although its film thickness cannot be measured correctly, its thickness can be calculated from the weight of the film (the specific gravity of the film is about 1.2). For metal substrates, the sharp corundum sand forms a messy rough surface, so the sharp corners of the corundum may break in the concave holes of the substrate. In order to prevent the sharp corners of the fracture from rusting after painting, the Treat with phosphate film first, so that the sharp corners broken on the metal substrate can be protected against rust and increase adhesion, so as to avoid oxidation or rust on the sharp corners of the bottom layer sprayed with fluororesin, which will cause the fluororesin film to fall off , which is a major innovation in fluororesin processing technology, and also the main feature of the existing non-stick pan processing methods that are quite different.

(3) Fluorine resin processing: as shown in Figure 3, the fluororesin in the floating state of homogeneously polymerized fluorine resins such as polytetrafluoroethylene (PTFE) with different binding numbers of 0.2-0.5 μm particles, Spray on the concave holes 11 and adhere to the surface of the phosphate film 12, so that the fluororesin 13 can be fully impregnated into the valleys and gaps of the concave holes 11 with uneven thickness, and firmly adhere to the surface of the film 12.

(4) Heating and drying molding: After the fluorine resin 13 is dried, it is heated in a furnace that gradually rises from 40°C to 120-400°C or even up to 450°C, so that the particles dissolve and combine with each other and solidify and harden, achieving very corrosion resistance 1. Hard surfaces with excellent non-stick properties. If heated at a temperature of about 120°C for about 5 minutes, and then adjusted to a temperature of 300-450°C for 5-10 minutes, the effect will be better. Of course, the conditions vary depending on the nature of the coating. difference.

As shown in Figure 4 and Figure 12, even after using the pot surface after this surface treatment for a period of time, after its sharp part is shoveled off, there is still the existence of fluorine resin in the concave part of the valley (shown in Figure 12 The black part is the fluorine resin), which maintains its good high-quality lubrication and non-stick properties.

In addition, the sandblasting treatment of the aforementioned step (1) can also be changed according to the requirements of different metal materials and pots. The sandblasting process can be omitted, and the metal material is first degreased, and the surface is roughened with an acid-base chemical etchant, as shown in Figure 11, and then the subsequent treatment is performed.

The chemical etching etchant can be divided into acid and alkali. The acid etching is, for example, a mixture of acidic ammonium fluoride 200g/l plus sulfuric acid or nitric acid 100g/l at 25-40°C for 60-100 seconds. , or mixed with ammonium fluoride 50-150g/l and ammonium sulfate in an appropriate amount, etched at room temperature for 2-3 minutes, and for alkali etching, use a mixture of 200g/l sodium hydroxide and 250g/l sodium nitrate at 65- It is etched at 80°C for 30-60 seconds, or mixed with sodium hydroxide 50-100g/l and sodium fluoride 20-40g/l, and etched at 60-80°C for 1-3 minutes.

Claims (6)

1. A metal surface treatment method, which is formed by sandblasting, phosphate film treatment, fluorine resin processing and heating and drying, characterized in that: (1) Sand blasting treatment: thick and fine steel sand or steel balls or steel gravel with sharp angles or a mixture of the three, high-pressure impact blasting on the surface of the metal, making it produce different diameters, depths, unevenness, uneven thickness and shape Messy pits; (2) Phosphate film treatment: degrease a small amount of oil before the film is formed, and add manganese phosphate, zinc phosphate or iron phosphate salts plus surfactants and accelerators, without affecting the physical properties of the metal substrate body Next, the surface of the metal substrate is dissolved, and on the one hand, a layer of messy fine rough surface is formed at the same time, that is, a film layer is formed. The process is as follows: degreasing→water washing→water washing→drying→surface adjustment and roughening→phosphate film treatment →Water washing→Water washing→Hot water washing→Drying→Painting; the treatment conditions are between PH4-6, 40-60℃, about 5-10 minutes by dipping or spraying, and the next step must be carried out in a short time after drying ; (3) Processing of fluororesin: Spray fluororesin in suspended state with different number of combinations on the surface of the concave hole with phosphate coating, so that the fluororesin can be fully impregnated into the concave holes with uneven thickness. In the gap of Kongbo Valley, it is firmly attached to the surface of the skin membrane; (4) Heating and drying molding: After the fluororesin is dried, it is heated in a furnace to make the particles dissolve and combine with each other and solidify and harden. 2. A metal surface treatment method, formed by chemical etching, phosphate film treatment, fluorine resin processing and heating and drying, characterized in that: (1) Chemical etching: its etchant can be divided into acid and alkali, among which acid etching is a mixture of acidic ammonium fluoride 200g/l plus sulfuric acid or nitric acid 100g/l at 25-40°C for 60-100 seconds , or mixed with ammonium fluoride 50-150g/l and ammonium sulfate in an appropriate amount, etched at room temperature for 2-3 minutes, and for alkali etching, use a mixture of 200g/l sodium hydroxide and 250g/l sodium nitrate at 65- It is etched at 80°C for 30-60 seconds, or mixed with sodium hydroxide 50-100g/l and sodium fluoride 20-40g/l, and etched at 60-80°C for 1-3 minutes; (2) Phosphate film treatment: degrease a small amount of oil before the film is formed, and add manganese phosphate, zinc phosphate or iron phosphate salts plus surfactants and accelerators, without affecting the physical properties of the metal substrate body Under this process, the surface of the metal substrate is dissolved, and on the one hand, a layer of messy fine rough surface is formed at the same time, that is, a film layer is formed. The process is as follows: degreasing→water washing→water washing→drying→surface adjustment and roughening→phosphate film treatment →Water washing→Water washing→Hot water washing→Drying→Painting; the treatment conditions are between PH4-6, 40-60℃, about 5-10 minutes by dipping or spraying, and the next step must be carried out in a short time after drying ; (3) Processing of fluororesin: Spray fluororesin in suspended state with different number of combinations on the surface of the concave hole with phosphate coating, so that the fluororesin can be fully impregnated into the concave holes with uneven thickness. In the gap of Kongbo Valley, it is firmly attached to the surface of the skin membrane; (4) Heating and drying molding: After the fluororesin is dried, it is heated in a furnace to make the particles dissolve and combine with each other and solidify and harden. 3. A metal surface treatment method, which is characterized in that: a concave hole structure with uneven shapes is formed on the metal surface, a layer of phosphate film is attached to it, and a layer of fluorine resin is adhered to the phosphate film. 4. The metal surface treatment method according to claim 1, characterized in that: sandblasting is performed with strong compressed air of 5-15kg/cm, sprayed by nozzles or strong centrifugal force of blasting blades running at high speed with a falling wheel, impacting It is better to spray on the surface of the metal to produce a concave hole with a diameter of about 0.5-1.5m/m and a depth of 30-80μm. 5. The metal surface treatment method according to claims 1 and 2, characterized in that after the phosphate film treatment, a phosphating film of 1-2.5 g/m is preferably formed. 6. The metal surface treatment method according to claims 1 and 2, characterized in that: the fluororesin is heated and dried in a furnace at a temperature of about 120°C for about 5 minutes, and then adjusted to 300-450°C The temperature is better for 5-10 minutes.

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