Preparation method of aluminum alloy surface silanization conversion film

A technology of aluminum alloy surface and silanization, applied in the direction of metal material coating process, etc., can solve the problems of high pollution, personal injury of construction personnel and personnel in the machine, and achieve the effect of good adhesion

Active Publication Date: 2016-10-12
SHENYANG AIRCRAFT CORP
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Problems solved by technology

However, chromate conversion coatings contain highly toxic and highly polluting hexavalent chromium, which is a carcinogenic species explicitly prohibited

Method used

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  • Preparation method of aluminum alloy surface silanization conversion film
  • Preparation method of aluminum alloy surface silanization conversion film
  • Preparation method of aluminum alloy surface silanization conversion film

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Embodiment Construction

[0019] A method for preparing a silanized conversion film on the surface of an aluminum alloy, the steps of which are as follows:

[0020] (1) Pre-processing:

[0021] (1.1) Grinding: Polish the aluminum alloy surface with 400# sandpaper, wash it with deionized water, dry it, and set it aside;

[0022] (1.2) Alkali washing: Alkali washing is carried out with alkaline washing liquid to completely remove the oxide film on the surface of the aluminum alloy, revealing a pure metal matrix, and providing a good foundation for the subsequent chemical film formation;

[0023] The composition of alkaline washing solution is as follows:

[0024]

[0025] The alkali washing condition is normal temperature, and the time is 3 minutes.

[0026] (1.3) Pickling: After the aluminum alloy material is alkali-washed, a layer of taupe or gray-black hanging ash will adhere to the surface, which is mainly composed of intermetallic compounds such as copper, iron, silicon, etc. that are insoluble...

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Abstract

A preparation method of an aluminum alloy surface silanization conversion film comprises the following steps: 1, pretreatment: grinding, carrying out alkali washing, and carrying out acid washing; and 2, coating: preparing a plating solution which comprises the following components: a silane coupling agent KH560 5 g/L, ethanol 20 g/L, phytic acid 1 g/L, sodium hexametaphosphate 1g/L and the balance of water, placing a workpiece in the plating solution after acid washing, standing for 1-3 minutes, forming a film at the room temperature, and drying for 40 minutes at the temperature of 150 DEG C to obtain the aluminum alloy surface silanization conversion film. According to the scheme, the surface of a sample does not have obvious corrosion substances after 168h neutral salt spray test; and a silanization conversion film test piece is taken, after an adhesive tape is adhered to the silanization conversion film test piece and torn from the silanization conversion film test piece by a cross-hatch method, the silanization conversion film test piece does not face, a coating does not drop, and therefore, the silanization conversion film test piece has good adhesion.

Description

technical field [0001] The invention relates to a preparation method for forming a silanized chemical conversion film on the surface of an aluminum alloy. Background technique [0002] The chromic acid conversion coating has the characteristics of good protective performance and easy mail coating combination, etc., and has been widely used in aerospace. However, chromate conversion coatings contain highly toxic and highly polluting hexavalent chromium, which is a carcinogenic species explicitly prohibited by RoHS directives and other environmental regulations, and will definitely cause serious harm to construction workers and machine workers. personal injury. Therefore, no matter from the perspective of environmental protection and safety, or the future development trend, hexavalent chromium will be replaced by chromium-free environmental protection treatment technology. Contents of the invention [0003] The purpose of the present invention is to provide a method for ch...

Claims

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Application Information

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IPC IPC(8): C23C22/07C23G1/22C23G1/12
CPCC23C22/07C23C2222/20C23G1/125C23G1/22
Inventor 乔永莲董宇周石磊刘建国
Owner SHENYANG AIRCRAFT CORP
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