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Decorative chromium plating method of aluminum and aluminum alloy parts

A technology of aluminum alloy parts and pre-nickel plating, which is applied in the direction of liquid chemical plating, metal material coating process, coating, etc., can solve the problems of poor bonding force, peeling, blistering, etc., and achieve the solution of blistering and peeling Effect

Inactive Publication Date: 2011-10-19
HARBIN
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] The present invention solves quality problems such as blistering, peeling and poor bonding force after electrochrome plating of aluminum alloys by improving the process of chemical galvanizing and pre-nickel plating in the aluminum and aluminum alloy decorative chrome plating method

Method used

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  • Decorative chromium plating method of aluminum and aluminum alloy parts
  • Decorative chromium plating method of aluminum and aluminum alloy parts
  • Decorative chromium plating method of aluminum and aluminum alloy parts

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Experimental program
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Effect test

Embodiment Construction

[0010] The embodiment of chemical galvanizing among the present invention is as follows:

[0011] The electroplating effect on aluminum and aluminum alloy substrates mainly depends on the meticulousness of the pre-plating preparation, so the chemical galvanizing process is strictly controlled as a key step in the entire electroplating process. According to the process requirements, the aluminum parts that have undergone pretreatments such as degreasing and alkali corrosion are chemically galvanized in zincate. Aluminum is more active, and when the oxide film on the surface and aluminum are dissolved in the solution, an equal amount of zinc is replaced, and the reaction is as follows:

[0012] 2Al+3Zn 2+ →3Zn+2Al 3+

[0013] The reaction stops when the very thin zinc layer is completely covered.

[0014] The zinc dipping process used in the existing electroplating decorative chromium process is as follows, and the zinc dipping solution is as follows:

[0015] Zinc oxide 95...

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Abstract

The invention belongs to field of protection decoration of aluminum and aluminum alloy parts, in particular relates to a chromium plating method. The decorative chromium plating method of the aluminum and aluminum alloy part comprises the steps of: pre-treating before plating, dipping zinc chemically, pre-plating nickel and plating chromium, wherein the step of dipping zinc chemically comprises two times of zinc dipping, dipping zinc, removing zinc and dipping zinc once again; and the method of pre-plating nickel comprises plating and polishing the nickel. In the invention, the processes of dipping zinc chemically and pre-plating zinc are improved, such that the problems that the aluminum alloy which is plated with chromium can be foamed and peeled and the bonding force is poor are solved.

Description

technical field [0001] The invention belongs to the technical field of aluminum and aluminum alloy protective decoration, and in particular relates to a method for electroplating chromium. Background technique [0002] In the production of aircraft parts, in order to achieve the purpose of improving the protection of aluminum parts - decorative performance and certain mechanical properties, in addition to protective methods such as anodizing and painting, it is also possible to use aluminum parts decorative chrome plating process for parts of such substrates to process. Because aluminum is an amphoteric metal that can react with both acid and alkali, the electroplating of aluminum and aluminum alloys is much more difficult than electroplating of other metal materials. At present, the most common aluminum and aluminum alloy electroplating decorative chromium process in production is: pre-plating treatment - chemical zinc immersion - pre-nickel plating - polishing - degreasin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/44C25D3/04C23C18/54C25D3/12
Inventor 王朝琳姜春玉李晖万杰李连军魏亚芳李世英
Owner HARBIN
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