Method for preparing trivalent chromium and phosphomolybdiumtungstic acid hybrid film on surface of aluminum alloy and film forming solution for method

A technology of aluminum alloy surface and film-forming liquid, which is applied in the coating process of metal materials, etc., can solve the problems of anti-corrosion performance, large pollution, high cost, etc., and achieve the effect of improving anti-corrosion performance, low concentration and low cost

Inactive Publication Date: 2012-08-01
GUANGXI UNIV FOR NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These preparation methods have high concentration, high cost, and large pollution, and their anti-corrosion performance needs to be improved.

Method used

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  • Method for preparing trivalent chromium and phosphomolybdiumtungstic acid hybrid film on surface of aluminum alloy and film forming solution for method
  • Method for preparing trivalent chromium and phosphomolybdiumtungstic acid hybrid film on surface of aluminum alloy and film forming solution for method
  • Method for preparing trivalent chromium and phosphomolybdiumtungstic acid hybrid film on surface of aluminum alloy and film forming solution for method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1 Trivalent chromium chromization of 2024 aluminum alloy

[0018] A. Build a 450L degreasing bath: Please clean the container thoroughly before building the bath. For new containers or new production lines, first wash with 50L of 10% sulfuric acid solution, then wash with water twice, each time with 100L of water, and then add Henkel's degreasing agent 9KGRidoline212, and then diluted to 450L with deionized water, the pH is controlled within the range of 7 to 8, and mixed evenly.

[0019] B. Build a 450L activation bath: Please clean the container thoroughly before building the bath. For a new container or a new production line, first clean it with 10% sulfuric acid solution, then clean it with water, add the required 9KG of sodium hydroxide, Then dissolve it with deionized water and dilute it to 450L with deionized water, and stir evenly. The temperature was maintained at 30°C.

[0020] C. Build a 450L chromium bath: Please clean the container thoroughly befo...

Embodiment 2

[0025] Example 2 Trivalent chromium chromization of 3003 aluminum alloy

[0026] A. Build a 450L degreasing bath: Please clean the container thoroughly before building the bath. For new containers or new production lines, first wash with 50L of 10% sulfuric acid solution, then wash with water twice, each time with 100L of water, and then add Henkel's degreasing agent 8KGRidoline212, and then diluted to 450L with deionized water, the pH is controlled within the range of 7-8, and mixed evenly.

[0027] B. Building an activation bath: Please clean the container thoroughly before building the bath. For a new container or a new production line, first clean it with 10% sulfuric acid solution, then clean it with water, add the required 12KG of sodium hydroxide, and then Dissolve with deionized water and then dilute to 450L with deionized water, stir evenly. The temperature was maintained at 20°C.

[0028] C. Build a 450L chromium bath: Please clean the container thoroughly before b...

Embodiment 3

[0033] Example 3 Trivalent chromium chromization of 4032 aluminum alloy

[0034] A. Build a 450L degreasing bath: Please clean the container thoroughly before building the bath. For new containers or new production lines, first wash with 50L of 10% sulfuric acid solution, then wash with water twice, each time with 100L of water, and then add Henkel's degreaser 9KGRidoline212, then diluted to 450L with deionized water, PH control in the range of 7-8, mix well.

[0035] B. Build a 450L activation bath: Please clean the container thoroughly before building the bath. For a new container or a new production line, first clean it with 10% sulfuric acid solution, then clean it with water, add the required 15KG of sodium hydroxide, Then dissolve it with deionized water and dilute it to 450L with deionized water, and stir evenly. The temperature was maintained at 15°C.

[0036] C. Build a 450L chromium bath: Please clean the container thoroughly before building the bath. For new conta...

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Abstract

The invention discloses a method for preparing a trivalent chromium and phosphomolybdiumtungstic acid hybrid film on the surface of aluminum alloy and a film forming solution for the method. Inorganic corrosion inhibitors, namely phosphomolybdic acid and phosphotungstic acid and amino trimethylene phosphonic acid or 1-hydroxyethane-1,1-diphosphonic acid or ethylene diamine tetra (methylene phosphonic acid) sodium corrosion inhibitors are added into the film forming solution; and when the film forming solution is used for treating an aluminum or aluminum alloy workpiece, a trivalent chromium, phosphomolybdic acid, phosphotungstic acid and amino trimethylene phosphonic acid or 1-hydroxyethane-1,1-diphosphonic acid or ethylene diamine tetra (methylene phosphonic acid) sodium hybrid film on the surface of the aluminum alloy. Compared with a single-layer trivalent chromium conversion film, the trivalent chromium and phosphomolybdiumtungstic acid hybrid film can improve the corrosion resistance of the aluminum alloy and can achieve the anticorrosion effect of a hexavalent chromium chemical conversion film.

Description

technical field [0001] The invention relates to aluminum alloy surface treatment, in particular to a method for preparing an aluminum alloy high-performance trivalent chromium hybrid conversion film and a film-forming solution thereof. Background technique [0002] In order to improve the corrosion resistance of aluminum and other metals such as zinc and steel, the traditional method is to use hexavalent chromium conversion coating. However, hexavalent chromium is toxic. In the electrical and electronic industries, the EU RoHS regulations (Restriction of Hazardous Substances, "Instructions on Restricting the Use of Certain Hazardous Substances in Electrical and Electronic Equipment") prohibit the use of hexavalent chromium compounds. In order to meet the needs of environmentally friendly processes, various hexavalent chromium-free conversion coatings have been developed. Recent research involves new conversion coatings such as titanium, tungsten, tin, zinc and rare earth sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/42
Inventor 余会成黄小小雷福厚谭学才韩燕燕韦冬萍
Owner GUANGXI UNIV FOR NATITIES
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