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Method for directly electrodepositing zinc on magnesium surface

A magnesium alloy and electrodeposition technology, which is applied in the field of metal material surface treatment, can solve the problems of high process cost, complex process, and inability to realize large-scale industrial production, and achieve low cost, low price, and corrosion-free electroplating. Effect

Inactive Publication Date: 2007-03-28
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0012] In view of the shortcomings of the existing magnesium alloy surface treatment process, such as high cost and complicated process, the surface treatment of magnesium alloy has not been able to realize large-scale industrial production so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Put deionized water in a plastic beaker, then electromagnetically stir the deionized water at 200rpm, then put 10g / L zinc fluoride into the stirred deionized water.

[0028] (2) Sodium citrate, potassium sodium tartrate and EDTA complexing agent were respectively added to the above-mentioned stirred zinc fluoride suspension until all the zinc fluoride was dissolved and the zinc fluoride suspension became a clear solution.

[0029] (3) Add water-soluble benzylidene acetone and surfactant to the above-mentioned clear solution zinc fluoride solution.

[0030] (4) The small piece of AZ91D magnesium alloy sheet is pretreated by polishing and degreasing.

[0031] (5) Put the pretreated magnesium alloy into the above-mentioned clarified solution of zinc fluoride for electrodepositing zinc, and the density of the DC power supply is controlled at 0.5-2A / dm 2 , Electrolysis temperature 45-55 ℃.

[0032] (6) Finally, put the zinc-electrodeposited magnesium alloy into a heat ...

Embodiment 2

[0033] Embodiment 2, 3 methods are identical with embodiment 1, and process condition and effect are as follows

[0034] implement

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Abstract

The invention relates to a magnesium alloy surface directly electrodeposited zinc method that includes the following steps: electrodepositing a layer of zinc on the magnesium alloy surface as protecting layer, adding complex agent into zinc fluoride deionized water until the suspension liquid becoming clear, putting the alloy into the solution to take electrodepositing zinc and putting the magnesium alloy to take thermal process in furnace. The method could realize industrialization producing and have no pollution to environment.

Description

technical field [0001] The invention relates to a method for surface treatment of metal materials, in particular to a method for surface treatment of magnesium alloys. Background technique [0002] Magnesium is the lightest metal structural material. Magnesium alloys have attracted much attention due to their small volume and mass, high specific strength, good processability, good electromagnetic shielding, and good vibration reduction, electrical and thermal conductivity. Magnesium alloys have developed greatly since they were used in the aerospace industry in the early days to the current applications in automotive materials, optical instruments, electronic telecommunications, and military industries. But the chemical stability of magnesium is low, the electrode potential is very negative (-2.34V), and the corrosion resistance is poor, which restricts the wide application of magnesium alloy materials to some extent. Therefore, the surface treatment of magnesium alloys and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/22C25D5/30
Inventor 朱萍周鸣吴金华李坤芳周劲
Owner SHANGHAI UNIV
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