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Silane hydrolysate applied to surface of 2024 aluminum alloy and use method of silane hydrolysate

A silane hydrolyzate, aluminum alloy surface technology, applied in metal material coating process and other directions, can solve problems such as poor corrosion resistance, and achieve the effect of excellent salt spray resistance and excellent storage stability

Inactive Publication Date: 2018-06-01
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

[0005] Aiming at the technical shortcomings and deficiencies of the current conversion coating on the surface of 2024 aluminum alloy, a silane hydrolyzate applied to the surface of 2024 aluminum alloy and its application method are provided, which solves the problem of poor corrosion resistance of the conversion coating on the surface of 2024 aluminum alloy. The silane hydrolyzate has excellent storage stability, and the conversion coating has excellent salt spray resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 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.

[0040] 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;

[0041] 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: sodium hydroxide 20g / L; sodium carbonate 20g / L; sodium silicate 5g / L; OP-10 emulsifier 1g / L; the rest is water.

[0042] The pickling solution is mixed with hydrochloric acid, nitric acid, hydrofluoric acid, sulfuric acid and water. The content of each component is as follows: hydrochloric acid 100g / L; nitric acid 10g / L; hydrofluoric acid 10g / L; sulfuric acid 60g / L; water.

[0043] The preparation method of the presen...

Embodiment 2

[0047] 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.

[0048] 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;

[0049] 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: sodium hydroxide 25g / L; sodium carbonate 30g / L; sodium silicate 10g / L; OP-10 emulsifier 2g / L; the rest is water.

[0050] The pickling liquid is mixed by hydrochloric acid, nitric acid, hydrofluoric acid, sulfuric acid and water, and the content of each component is as follows: hydrochloric acid 120g / L; nitric acid 15g / L; hydrofluoric acid 8g / L; sulfuric acid 50g / L; water.

[0051] The preparation method of the presen...

Embodiment 3

[0055] 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.

[0056] 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;

[0057] 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: sodium hydroxide 15g / L; sodium carbonate 25g / L; sodium silicate 15g / L; OP-10 emulsifier 1g / 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: hydrochloric acid 90g / L; nitric acid 10g / L; hydrofluoric acid 12g / L; sulfuric acid 70g / L; water.

[0059] The preparation method of the pres...

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Abstract

The invention relates to the field of surface environmental protection of aluminum alloy, in particular to a silane hydrolysate applied to the surface of 2024 aluminum alloy and a use method of the silane hydrolysate. The silane hydrolysate is prepared from the following components based on content: 5-30 g / L of silane, 5-40 g / L of a cosolvent, 0.1-10 g / L of a corrosion inhibitor, 0.1-4 g / L of an oxidant, 0.1-3 g / L of a pH regulator and the balance of deionized water. During use, firstly, the aluminum alloy is first polished, washed in alkali and pickled; then, the aluminum alloy is soaked in the silane hydrolysate for 1-10 min, taken out and solidified at 25-200 DEG C to form a silane film. The silane hydrolysate applied to the surface of the 2024 aluminum alloy does not contain hexavalentchromium or heavy metal ion compounds of lead, mercury and cadmium, does not contain volatile toxic solvents such as benzene and xylene and meets environmental requirements, the process is simple, industrialization is easy, and the silane film has excellent corrosion resistance.

Description

technical field [0001] The invention relates to the field of environmental protection of aluminum alloy surfaces, in particular to a silane hydrolyzate applied to the surface of 2024 aluminum alloys and a method for using the same. 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] In recent years, with the gradu...

Claims

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Application Information

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IPC IPC(8): C23C22/40C23C22/06C23C22/07C23C22/42
CPCC23C22/40C23C22/06C23C22/07C23C22/42C23C2222/20
Inventor 李庆鹏张博赵焕刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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