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Method for titanium-zirconium conversion film/silane film double-layer protection for aluminium alloy surface

A technology of aluminum alloy surface and conversion film, which is applied in the direction of superimposed layer plating, metal material coating process, coating, etc., can solve the problems of insufficient corrosion resistance and wear resistance, and achieve excellent wear resistance, excellent Effect of salt spray resistance and excellent storage stability

Inactive Publication Date: 2017-05-24
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the shortcomings and deficiencies of the prior art, the purpose of the present invention is to provide a method for the double-layer protection of titanium-zirconium conversion film / silane film on the surface of aluminum alloy, using the surface treatment technology of titanium-zirconium conversion film / silane film double-layer protection , to solve the lack of corrosion resistance and wear resistance of a single conversion coating, and the composite conversion coating has excellent salt spray resistance and wear resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] First, the sample is prepared, the aluminum alloy is polished, then alkali washed, then washed with a large amount of water, then pickled, and then washed with a large amount of water.

[0045] The grinding method is to mechanically polish the surface of the aluminum alloy step by step with 400#, 600#, 800# and 1200# sandpaper, then wash it with deionized water, dry it, and set it aside;

[0046] Alkaline lotion is made by mixing sodium hydroxide, sodium carbonate, sodium silicate, OP-10 emulsifier and water. The content of each component is as follows:

[0047] Sodium hydroxide 20g / L; sodium carbonate 20g / L; sodium silicate 5g / L; OP-10 emulsifier 1g / L; the rest is water.

[0048] The pickling liquid is mixed with hydrochloric acid, nitric acid, hydrofluoric acid, sulfuric acid and water, and the content of each component is as follows:

[0049] Hydrochloric acid 100g / L; nitric acid 10g / L; hydrofluoric acid 10g / L; sulfuric acid 60g / L; the rest is water.

[0050] Then, t...

Embodiment 2

[0054] First, the sample is prepared, the aluminum alloy is polished, then alkali washed, then washed with a large amount of water, then pickled, and then washed with a large amount of water.

[0055] The grinding method is to mechanically polish the surface of the aluminum alloy step by step with 400#, 600#, 800# and 1200# sandpaper, then wash it with deionized water, dry it, and set it aside;

[0056] Alkaline lotion is made by mixing sodium hydroxide, sodium carbonate, sodium silicate, OP-10 emulsifier and water. The content of each component is as follows:

[0057] Sodium hydroxide 25g / L; sodium carbonate 30g / L; sodium silicate 10g / L; OP-10 emulsifier 2g / L; the rest is water.

[0058] The pickling liquid is mixed with hydrochloric acid, nitric acid, hydrofluoric acid, sulfuric acid and water, and the content of each component is as follows:

[0059] Hydrochloric acid 120g / L; nitric acid 15g / L; hydrofluoric acid 8g / L; sulfuric acid 50g / L; the rest is water.

[0060] Then,...

Embodiment 3

[0064] First, the sample is prepared, the aluminum alloy is polished, then alkali washed, then washed with a large amount of water, then pickled, and then washed with a large amount of water.

[0065] The grinding method is to mechanically polish the surface of the aluminum alloy step by step with 400#, 600#, 800# and 1200# sandpaper, then wash it with deionized water, dry it, and set it aside;

[0066] Alkaline lotion is made by mixing sodium hydroxide, sodium carbonate, sodium silicate, OP-10 emulsifier and water. The content of each component is as follows:

[0067] Sodium hydroxide 15g / L; sodium carbonate 25g / L; sodium silicate 15g / L; OP-10 emulsifier 1g / L; the rest is water.

[0068] The pickling liquid is mixed with hydrochloric acid, nitric acid, hydrofluoric acid, sulfuric acid and water, and the content of each component is as follows:

[0069] Hydrochloric acid 90g / L; nitric acid 10g / L; hydrofluoric acid 12g / L; sulfuric acid 70g / L; the rest is water.

[0070] Then,...

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Abstract

The invention relates to the field of surface protection for aluminium alloys, and specifically discloses a method for titanium-zirconium conversion film / silane film double-layer protection for an aluminium alloy surface. The method comprises the following steps: firstly, carrying out polishing, alkali cleaning and acid cleaning on an aluminium alloy, then soaking the aluminium alloy in a zirconium / titanium conversion solution for 1-60min to generate a layer of titanium / zirconium conversion film, naturally airing, then soaking a sample sheet in a silane hydrolysate for 1-30min, taking out, and then curing at 25-200 DEG C to form a silane film. According to the method disclosed by the invention, a surface treatment technology of titanium-zirconium conversion film / silane film double-layer protection is adopted, and the defects of low corrosion resistance of a single conversion film and the silane film, low wear resistance of the single conversion film, and the like are solved; and moreover, the treatment solution in the method disclosed by the invention is free from toxic substances and meets the requirement of environmental protection, and the process is simple and easy to form industrialization.

Description

technical field [0001] The invention relates to the field of surface protection of aluminum alloys, in particular to a method for double-layer protection of titanium-zirconium conversion film / silane film on the surface of aluminum alloys. Background technique [0002] Aluminum alloy has the characteristics of light weight, high specific strength, high thermal conductivity, and good heat dissipation performance. It is widely used in aerospace, chemical industry, transportation and other fields. However, the chemical activity of aluminum and its alloys is high, and a thin oxide film can be formed on the surface in the atmospheric environment. This spontaneously formed oxide film is easily destroyed, especially in the environment of chloride ions. Corrosion, in order to overcome the shortcomings of aluminum alloy surface properties, expand its application range, and prolong its service life, aluminum alloy surface protection is very important. [0003] Chromate conversion coat...

Claims

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Application Information

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IPC IPC(8): C23C28/00
CPCC23C28/00
Inventor 李庆鹏晏智强刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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