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Method for preparing chemical conversion film on aluminum alloy surface on basis of molybdate

A chemical conversion coating, aluminum alloy surface technology, applied in the field of aluminum alloy surface treatment, can solve the problem of solution stability, application limitation, colorless film and other problems, achieve low cost, low component content, neutral salt resistance good fog effect

Active Publication Date: 2014-06-18
WUHAN RES INST OF MATERIALS PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Generally speaking, the corrosion resistance of the film layer obtained by the organic single or composite passivation technology can temporarily reach the level of chromate, but its solution stability has a big problem, the film layer is colorless, the cost is high, and the application is greatly affected. limit

Method used

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  • Method for preparing chemical conversion film on aluminum alloy surface on basis of molybdate
  • Method for preparing chemical conversion film on aluminum alloy surface on basis of molybdate
  • Method for preparing chemical conversion film on aluminum alloy surface on basis of molybdate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Proceed as follows:

[0031] (1) Configuration of the treatment solution: 0.5g / L sodium molybdate, 2g / L potassium fluotitanate, 0.8g / L potassium fluozirconate, 0.8g / L tricitric acid in distilled water in sequence Sodium treatment solution 500ml, adjust the pH value of the solution in the range of 3.0-3.4 with dilute nitric acid for later use.

[0032] (2) Aluminum alloy pretreatment: Soak 6036 aluminum alloy in commercially available acid degreasing solution for 5min-10min, then rinse with tap water for 1min-2min, then rinse with distilled water until the oil is removed, and finally dry it for later use.

[0033] (3) Chemical conversion of aluminum alloy: the aluminum alloy cleaned in step (2) is placed in the above treatment solution for chemical conversion, the temperature is controlled at 25°C-30°C, and the treatment time is 5 minutes.

[0034] (4) Wash and dry the aluminum alloy transformed in step (3), and it can be seen that there is a golden yellow conversion fi...

Embodiment 2

[0037] Proceed as follows:

[0038] (1) Configuration of treatment liquid: 0.3g / L sodium molybdate, 2g / L potassium fluotitanate, 0.8g / L potassium fluozirconate, 0.8g / L tricitric acid were prepared in distilled water in sequence Sodium treatment solution 500ml, adjust the pH value of the solution in the range of 3.0-3.4 with dilute nitric acid for later use.

[0039] (2) Aluminum alloy pretreatment: Soak 6036 aluminum alloy in acid degreasing solution for 5min-10min, then rinse with tap water for 1min-2min, then rinse with distilled water until the oil is removed, and finally dry it for later use.

[0040] (3) Chemical transformation of aluminum alloy: the aluminum alloy cleaned in step (2) is placed in the above treatment solution for chemical transformation, the temperature is controlled at 30°C-31°C, and the treatment time is 5 minutes.

[0041] (4) Wash and dry the aluminum alloy transformed in step (3), and it can be seen that there is a golden yellow conversion film on t...

Embodiment 3

[0044] Proceed as follows:

[0045] (1) Configuration of the treatment solution: 0.6g / L sodium molybdate, 2g / L potassium fluotitanate, 0.8g / L potassium fluozirconate, 0.4g / L tricitric acid in distilled water in sequence Sodium treatment solution 500ml, adjust the pH value of the solution in the range of 3.0-3.4 with dilute nitric acid for later use.

[0046] (2) Aluminum alloy pretreatment: Soak 6036 aluminum alloy in acid degreasing solution for 5min-10min, then rinse with tap water for 1min-2min, then rinse with distilled water until the oil is removed, and finally dry it for later use.

[0047] (3) Chemical transformation of aluminum alloy: the aluminum alloy cleaned in step (2) is placed in the above treatment solution for chemical transformation, the temperature is controlled at 30°C-31°C, and the treatment time is 5 minutes.

[0048] (4) Wash and dry the aluminum alloy transformed in step (3), and it can be seen that there is a golden yellow conversion film on the surfa...

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Abstract

The invention discloses a method for preparing a chemical conversion film on an aluminum alloy surface on the basis of molybdate and belongs to the technical field of aluminum alloy surface treatment. According to the method, chemical conversion treating fluid for preparing the chemical conversion film consists of molybdate, titanium fluoride, zirconium fluoride and a complexing agent component; according to the formula, the molybdate, the titanium fluoride, the zirconium fluoride and the complexing agent component are added into distilled water in sequence to prepare uniform mixed solution; pH of the solution is regulated to a determined value by dilute nitric acid, thus obtaining the chemical conversion treating fluid; in the chemical conversion treatment, the aluminum alloy is treated for 4-6 minutes at 25 DEG C-30 DEG C, washed with water, and blown to dry to form an uniform golden yellow conversion film on the aluminum alloy surface. According to the method, the chemical conversion treating fluid is low in cost, simple in treatment process, does not contain chromium and does not need after-treatment; and the formed conversion film has good corrosion resistance and binding force, can replace the conventional hexavalent chromium treatment technique for the aluminum alloy surface and can be used for surface treatment of the aluminum alloy.

Description

technical field [0001] The invention discloses a method for preparing a chemical conversion film on the surface of an aluminum alloy based on molybdate, belonging to the technical field of aluminum alloy surface treatment. Background technique [0002] Chromate chemical oxidation technology is widely used in the surface protection of aluminum alloy products because of its stable process, excellent corrosion resistance and stability of passivation film, and uniform color of film. However, hexavalent chromium is highly toxic and carcinogenic. The European Union has issued a series of RoHS directives prohibiting the use of six harmful substances such as hexavalent chromium, the 2002 / 95 / EC directive for electrical and electronic equipment, and the 2000 / 53 / EC directive for the automotive industry. my country has also promulgated corresponding regulations to prohibit the use of products containing hexavalent chromium in electronic and electrical equipment put on the market. The c...

Claims

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Application Information

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IPC IPC(8): C23C22/44C23C22/46
Inventor 占稳刘晓辉欧阳贵
Owner WUHAN RES INST OF MATERIALS PROTECTION
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