Chemical oxidation liquid for aluminum alloy

A chemical oxidation, aluminum alloy technology, applied in the direction of metal material coating process, etc., can solve the problems of poor corrosion resistance of the film layer, colorless film layer, high temperature, etc., and achieve the effects of low cost, convenient purchase, and convenient production control

Inactive Publication Date: 2011-10-19
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the environmental protection problems of chromate oxidation in the above-mentioned prior art and the high temperature and long time of the existing chromate-free oxidation process, the film is colorless, and the corrosion resistance of the obtained film is relatively poor To meet the shortcomings, provide an environmentally friendly and economical aluminum alloy chemical oxidation solution with simple composition, reasonable formula, obvious change in appearance after oxidation, good corrosion resistance of the film layer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A kind of aluminum alloy chemical oxidation solution, its composition formula is: ammonium molybdate 5g / L, triammonium phosphate 2g / L, sodium fluorosilicate 3g / L, sodium fluoride 3g / L, sodium citrate 2g / L, high Potassium manganate 3g / L, solution pH 5.

[0015] The following process is used to oxidize the aluminum alloy of model 5052:

[0016] (1) Use an alkaline degreasing solution to remove the oil stains on the surface of the aluminum alloy parts, and then wash them with water;

[0017] (2) Wash with water after removing the oxide film on the surface of the aluminum alloy parts with an acidic solution;

[0018] (3) Oxidation in the oxidation treatment solution, the treatment temperature is 50 ° C, and washed with water after treatment for 1 minute;

[0019] (4) Blow dry with cold wind. The obtained film layer is uniform light yellow, and the film layer is smooth.

Embodiment 2

[0021] A kind of aluminum alloy chemical oxidation solution, its composition formula is: ammonium molybdate 15g / L, trisodium phosphate 10g / L, sodium fluorosilicate 5g / L, ammonium citrate 5g / L, manganese sulfate 0.5g / L, solution The pH is 6.

[0022] The aluminum alloy of type 6063 is oxidized by the following process during use:

[0023] (1) Use an alkaline degreasing solution to remove the oil stains on the surface of the aluminum alloy parts, and then wash them with water;

[0024] (2) Wash with water after removing the oxide film on the surface of the aluminum alloy parts with an acidic solution;

[0025] (3) Oxidation in the oxidation treatment solution, the treatment temperature is 40 ° C, and washed with water after treatment for 5 minutes;

[0026] (4) Blow dry with cold wind. The obtained film layer is light yellow and smooth.

Embodiment 3

[0028] A kind of aluminum alloy chemical oxidation solution, its composition formula is: sodium molybdate 12g / L, ammonium dihydrogen phosphate 5g / L, manganese sulfate 3g / L, potassium sodium tartrate 5g / L, sodium fluoride 5g / L, solution pH The value is 4.5.

[0029] Use the following process to oxidize the aluminum alloy of model 5052;

[0030] (1) Use an alkaline degreasing solution to remove the oil stains on the surface of the aluminum alloy parts, and then wash them with water;

[0031] (2) Wash with water after removing the oxide film on the surface of the aluminum alloy parts with an acidic solution;

[0032] (3) Oxidation in the oxidation treatment solution, the treatment temperature is 30 ° C, and washed with water after treatment for 10 minutes;

[0033] (4) Blow dry with cold wind. The resulting film is yellow and smooth.

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Abstract

The present invention relates to a chemical oxidation liquid for an aluminum alloy. The chemical oxidation liquid has a pH value of 4.0-6.0 and is composed of the following components of: molybdate, phosphate, fluoride, a manganese compound, organic acid (salt) and water, wherein the molybdate content in the solution is 1.0-15 g / L, the phosphate content is 0.5-10 g / L, the manganese content is 0.1-3 g / L, the fluoride content is 0.5-5 g / L and the organic acid (salt) content is 0.3-5 g / L. The solution provided by the present invention can be produced at room temperature, and is subjected to impregnation treatment to form an oxide film with a good binding force. All components in the chemical oxidation liquid are non-toxic or low-toxicity compounds and are free of heavy metals such as hexavalent chromium, cadmium and lead, and the components in the solution are free of noble metals and are conventional commercial products, so that the cost is low. After the oxidation process, a sealing process is omitted, thus simplifying process, and the production is convenient to control. The solution provided by the present invention can be used for the oxidation treatment of deformed aluminum alloy products such as aluminum alloy profiles.

Description

technical field [0001] The invention relates to the surface treatment of aluminum and aluminum alloy, in particular to an aluminum alloy chemical oxidation solution. Background technique [0002] Aluminum alloy has excellent physical and chemical properties such as light weight, good electrical and thermal conductivity, strong reflectivity, easy processing, etc., and also has the advantages of low price. Wide range of applications. However, the aluminum alloy has active chemical properties and poor corrosion resistance, and the aluminum alloy material has low hardness and poor wear resistance. Therefore, the aluminum alloy must undergo corresponding surface treatment before use to improve its hardness, wear resistance and corrosion resistance. At present, the common aluminum alloy surface treatment processes include chemical oxidation, anodic oxidation and micro-arc oxidation. Among them, the chemical oxidation method can form an oxide film with a thickness of about 0.5-4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/44
Inventor 刘海萍毕四富曹立新马吉伟
Owner HARBIN INST OF TECH AT WEIHAI
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