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Method for forming conductive coating for electroplating on surface of magnesium alloy by physical vapor deposition

A physical vapor deposition, conductive coating technology, applied in the field of surface treatment, can solve the problem that magnesium alloy is not suitable for electroplating method, etc., to achieve the effect of improving corrosion resistance

Active Publication Date: 2016-05-04
宏正(福建)化学品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, magnesium alloys are not suitable for conventional electroplating methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Grinding the LA91 magnesium-lithium alloy, using water-resistant sandpaper from 400# to 1500# step by step, rinse with tap water countercurrently, degrease with lye, rinse with tap water countercurrently and then pickle, rinse with tap water countercurrently, rinse with tap water countercurrently after activation, and rinse with pure water , After quickly drying with a hair dryer, magnetron sputtering metal nickel, and then sequentially alkaline copper plating, acid copper plating, acid tin plating.

Embodiment 2

[0024] Grind the sample of LZ91 magnesium alloy, grind it from 400# to 3000# with water-resistant sandpaper, degrease with lye after washing, rinse with tap water countercurrent and then with pure water, put it into stannate conversion solution to form stannate conversion film , rinsed with tap water, dried and then ion-plated silver on the conversion coating, followed by alkaline electroless nickel plating, alkaline electroplating copper, acidic electroplating copper, and tin-bismuth alloy electroplating.

Embodiment 3

[0026] Grind the sample of LA141 magnesium alloy, grind it from 400# to 1000# with water-resistant sandpaper, remove the oil with lye after washing, rinse with tap water countercurrent and then with pure water, put it into rare earth solution to prepare rare earth conversion coating, rinse with tap water and then with pure water Rinse and dry quickly with a hair dryer. After drying, metal tin is vacuum-deposited on the conversion film, followed by alkaline tin plating, acid tin plating, and tin-cerium alloy plating.

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PUM

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Abstract

The invention discloses a method for forming a conductive coating for electroplating on the surface of a magnesium alloy substrate by physical vapor deposition and belongs to the field of surface treatment. The method particularly comprises the following steps: Step 1, pretreatment for forming the conductive coating; Step 2, forming of the conductive coating; and Step 3, a coating process after the conductive coating is formed. According to the method, through adjustment of the key steps for forming the conductive coating, the coating with a favorable magnesium alloy binding force and favorable conductivity is formed on the surface of magnesium alloy, which lays a solid foundation for follow-up electroplating.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a technique for forming a conductive coating for electroplating on the surface of a magnesium alloy by physical vapor deposition, so as to facilitate subsequent electroplating on the surface of the magnesium alloy to form a solderable conductive layer with high corrosion resistance. Background technique [0002] Magnesium alloy has low density, high unit elastic modulus, high compressive yield limit, good impact toughness, high bending strength, high resistance to high-energy particle penetration, good plasticity, easy processing deformation, and welding forming. The excellent performance of magnesium alloy makes it the most ideal structural material in many fields, such as aerospace, automobile, military industry, electronics and computer and other fields. [0003] However, the electrode potential of magnesium alloy is extremely negative, and the standard electrode pot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/42
CPCC25D5/42
Inventor 周琦
Owner 宏正(福建)化学品有限公司