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Preparation method for aluminum alloy with cobalt corrosion-resistant membrane

An aluminum alloy and corrosion-resistant technology is applied in the field of aluminum alloy preparation to achieve the effects of improving corrosion resistance, simple steps and low cost

Inactive Publication Date: 2016-01-06
裴秀琴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hexavalent chromium is a carcinogen. With the strengthening of environmental awareness, governments and enterprises in various countries are gradually restricting the use of such substances.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for preparing an aluminum alloy with a cobalt corrosion-resistant film, comprising the following steps:

[0020] 1) Surface pretreatment of the aluminum alloy: polish the surface of the aluminum alloy until bright; rinse with deionized water; soak in methanol for 1 hour at 60°C; rinse with deionized water after taking it out; Soak in / L sodium hydroxide solution for 5 minutes, take it out and rinse it with deionized water.

[0021] 2) Immerse the pretreated aluminum alloy in the cobalt oxalate conversion liquid dissolved with organic silicon, and a film-forming reaction occurs on the surface of the aluminum alloy to form a corrosion-resistant film; the cobalt oxalate conversion liquid dissolved with organic silicon consists of the following components Composition: cobalt oxalate 22g / L, hydrogen peroxide 30g / L, vinyltrimethoxysilane 14g / L, propylene glycol butyl ether 8g / L, copper hydride 14g / L, pH=3.6.

[0022] 3) The aluminum alloy after film formation is tak...

Embodiment 2

[0024] 1) Surface pretreatment of the aluminum alloy: polish the surface of the aluminum alloy until bright; rinse with deionized water; soak in methanol for 1 hour at 60°C; rinse with deionized water after taking it out; Soak in / L sodium hydroxide solution for 5 minutes, take it out and rinse it with deionized water.

[0025] 2) Immerse the pretreated aluminum alloy in the cobalt oxalate conversion liquid dissolved with organic silicon, and a film-forming reaction occurs on the surface of the aluminum alloy to form a corrosion-resistant film; the cobalt oxalate conversion liquid dissolved with organic silicon consists of the following components Composition: cobalt oxalate 30g / L, hydrogen peroxide 30g / L, vinyltrimethoxysilane 14g / L, propylene glycol butyl ether 8g / L, copper hydride 14g / L, pH=3.6.

[0026] 3) The aluminum alloy after film formation is taken out, washed with deionized water, and dried.

Embodiment 3

[0028] 1) Surface pretreatment of the aluminum alloy: polish the surface of the aluminum alloy until bright; rinse with deionized water; soak in methanol for 1 hour at 60°C; rinse with deionized water after taking it out; Soak in / L sodium hydroxide solution for 5 minutes, take it out and rinse it with deionized water.

[0029] 2) Immerse the pretreated aluminum alloy in the cobalt oxalate conversion liquid dissolved with organic silicon, and a film-forming reaction occurs on the surface of the aluminum alloy to form a corrosion-resistant film; the cobalt oxalate conversion liquid dissolved with organic silicon consists of the following components Composition: cobalt oxalate 28g / L, hydrogen peroxide 30g / L, vinyltrimethoxysilane 14g / L, propylene glycol butyl ether 8g / L, copper hydride 14g / L, pH=3.6.

[0030] 3) The aluminum alloy after film formation is taken out, washed with deionized water, and dried.

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PUM

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Abstract

The invention relates to a preparation method for aluminum alloy with a cobalt corrosion-resistant membrane. The preparation method comprises the following steps that 1, surface pretreatment is conducted on the aluminum alloy; 2, the pretreated aluminum alloy is immersed in cobalt oxalate transformation liquid dissolved with organic silicon, a membrane forming reaction is conducted on the surface of the aluminum alloy, the corrosion-resistant membrane is formed, the cobalt oxalate transformation liquid dissolved with the organic silicon is composed of cobalt oxalate of 22-30 g / L, hydrogen peroxide of 30 g / L, vinyl trimethoxy silane of 14 g / L, propanediol butyl ether of 8 g / L and copper hydride of 14 g / L, and pH is 3.6; and 3, the aluminum alloy with the membrane formed is taken out, washed with deionized water and dried. The preparation method for the aluminum alloy with the cobalt corrosion-resistant membrane is simple in step, does not need complex machining equipment, is lower in cost, ensures that the even and stable cobalt corrosion-resistant membrane is formed on the surface of the aluminum alloy by setting the proper parameter conditions, and can obviously improve the corrosion resistance performance of the aluminum alloy.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a method for preparing an aluminum alloy with a cobalt corrosion-resistant film. Background technique [0002] Aluminum alloy is the most widely used non-ferrous metal structural material in industry, and has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industry. With the rapid development of industrial economy, the demand for welded structural parts of aluminum alloy is increasing day by day, so that the research on weldability of aluminum alloy is also in-depth. [0003] At present, the protection method of aluminum alloy usually uses chromate to form a corrosion-resistant film on the surface of aluminum alloy. However, hexavalent chromium is a carcinogen. With the strengthening of environmental protection awareness, governments and enterprises in various countries are gradually restricting the use of such substa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/46
Inventor 裴秀琴
Owner 裴秀琴