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Chemical treatment method for aluminum alloy surface

A technology of aluminum alloy surface and chemical treatment, applied in the direction of metal material coating process, etc., can solve the problems of toxic hexavalent chromium ions, environmental pollution, human health hazards, etc., and achieve excellent surface quality, stable process and low cost Effect

Inactive Publication Date: 2009-06-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: The present invention provides a chemical treatment method for the surface of aluminum alloys, the purpose of which is to solve the problem that toxic and carcinogenic hexavalent chromium ions are contained in the treated products and treatment liquids, which are harmful to human health. Serious harm, serious pollution to the environment

Method used

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  • Chemical treatment method for aluminum alloy surface
  • Chemical treatment method for aluminum alloy surface
  • Chemical treatment method for aluminum alloy surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take a 20×70×2mm LY12 aluminum alloy sample for use.

[0036] (1) Grinding. Sand with water-resistant sandpaper to 800 # .

[0037] (2) Chemical degreasing. First prepare the chemical degreaser, the formula is as follows:

[0038]

[0039]

[0040] Dissolve the above-mentioned components other than the deionized water in deionized water according to the formula ratio, mix to obtain an aqueous solution, and put it into a container for later use. Soak the aluminum alloy sample to be treated in the above aqueous solution, keep the temperature of the solution at 55° C., and soak for 5 minutes.

[0041] (3) Alkali corrosion. The above chemically degreased aluminum alloy sample was immersed in 50g / L sodium hydroxide, the temperature was maintained at 55°C, and the treatment time was 6 minutes.

[0042] (4) Light out. Immerse the above chemically degreased aluminum alloy sample in 200g / L nitric acid, and treat it at room temperature for 3 minutes.

[0043] (5) Ch...

Embodiment 2

[0050] Take a 20×70×2mm LY12 aluminum alloy sample for use.

[0051] (1) Grinding. Sand with water-resistant sandpaper to 800 # .

[0052] (2) Chemical degreasing. First prepare the chemical degreaser, the formula is as follows:

[0053]

[0054] Dissolve the above-mentioned components other than the deionized water in deionized water according to the formula ratio, mix to obtain an aqueous solution, and put it into a container for later use. Soak the aluminum alloy sample to be treated in the above aqueous solution, keep the temperature of the solution at 55° C., and soak for 5 minutes.

[0055] (3) Alkali corrosion. The above chemically degreased aluminum alloy sample was immersed in 50g / L sodium hydroxide, the temperature was maintained at 55°C, and the treatment time was 6 minutes.

[0056] (4) Light out. Immerse the above chemically degreased aluminum alloy sample in 200g / L nitric acid, and treat it at room temperature for 3 minutes.

[0057] (5) Chemical treat...

Embodiment 3

[0064] Take a 20×70×2mm LY12 aluminum alloy sample for use.

[0065] (1) Grinding. Sand with water-resistant sandpaper to 800 # .

[0066] (2) Chemical degreasing. First prepare a chemical degreaser, the formula is as follows:

[0067]

[0068] Dissolve the above-mentioned components other than the deionized water in deionized water according to the formula ratio, mix to obtain an aqueous solution, and put it into a container for later use. Soak the aluminum alloy sample to be treated in the above aqueous solution, keep the temperature of the solution at 55° C., and soak for 5 minutes.

[0069] (3) Alkali corrosion. The above chemically degreased aluminum alloy sample was immersed in 50g / L sodium hydroxide, the temperature was maintained at 55°C, and the treatment time was 6 minutes.

[0070] (4) Light out. Immerse the above chemically degreased aluminum alloy sample in 200g / L nitric acid, and treat it at room temperature for 3 minutes.

[0071] (5) Chemical treatme...

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Abstract

An aluminum alloy surface chemical method belongs to the fine chemical field. The treatment method is to put the aluminum alloy into the bath liquid containing potassium permanganate 0.01 to 10g / L, titanous sulfate 0.01 to 5g / L, wetter sodium dodecylbenzene sulfonate 0.1 to 10g / L, with the pH value being 1 to 4, and the temperature of 40 to 90DEG C to treat for 1 to 8 minutes, and then seal with boiled water for 20 to 30 minutes, and finally an even, fine golden conversion film with certain thickness is obtained on the surface of the aluminum alloy. The conversion film has excellent corrosion resistance performance. The invention can well solve the problems that products or emission during or after treatment of the current chromate solution to the aluminum alloy surface contain sexivalent chromium, which severely pollute the environment and harm the health of human body, etc; and the corrosion resistance of the invention is equal to that after treatment by the chromate solution.

Description

technical field [0001] The invention relates to a chemical treatment method for the surface of aluminum alloy, which is a novel, high-performance, green and environment-friendly method for forming a layer-like dense nano-golden oxide film on the surface of the aluminum alloy through chemical treatment to enhance the corrosion resistance of the aluminum alloy. The aluminum alloy corrosion-resistant surface treatment process and technology belong to the field of fine chemical industry. Background technique [0002] Aluminum is a non-ferrous metal that is second only to steel in terms of output and consumption in the world. With the continuous development of modern science and technology and the continuous emergence of new industrial fields, the use of aluminum is becoming more and more extensive, the demand is increasing day by day, and it is playing an increasingly important role in the national economy. Among the 124 industries in our country, 113 departments use aluminum p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/56C23G1/22C23F1/36
Inventor 熊金平吕勇武左禹
Owner BEIJING UNIV OF CHEM TECH
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