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Method for electroplating nickel on surface of magnesium alloy

A technology of electroplating nickel and magnesium alloys, which is applied in the direction of superimposed layer plating, metal material coating process, coating, etc., can solve the problems of sensitive plating quality stability, poor stability of electroplating solution, ecological environment pollution, etc. Low cost, light environmental pollution, uniform surface effect

Inactive Publication Date: 2011-02-02
CHANGCHUN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The former uses toxic cyanide, which will cause serious pollution to the ecological environment; the latter has poor stability of the electroplating solution, strict control of pyrophosphate copper plating process parameters, and is very sensitive to the stability of the plating quality, which brings inconvenience to the operator.

Method used

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  • Method for electroplating nickel on surface of magnesium alloy
  • Method for electroplating nickel on surface of magnesium alloy
  • Method for electroplating nickel on surface of magnesium alloy

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0020] The sample for implementation uses AZ91D magnesium alloy with a specification of 30mm×20mm×2mm as the electroplating cathode, which is polished with 240#~600# sandpaper, and is subjected to conventional alkali degreasing and acid derusting treatment.

[0021] 1. Embodiment 1

[0022] The above samples were treated in 40% HF at room temperature for 10 minutes. After the magnesium alloy surface with certain chemical activity is obtained, galvanizing treatment is carried out. The formula and process of the treatment solution are shown in Table 1.

[0023] Formulation and technological conditions of table 1 galvanizing solution

[0024]

[0025] The samples after galvanizing were pre-plated with copper-tin alloy, and the plating solution formula and process conditions are shown in Table 2. After pre-plating copper-tin alloy, the surface morphology can be obtained as follows: figure 1 Copper-tin alloy plating shown. The samples after the pre-plating of copper-tin all...

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Abstract

The invention discloses a method for electroplating nickel on the surface of a magnesium alloy, including the realization of hot-dip galvanizing-cyanide-free copper electroplating pretreatment. The method firstly carries out surface derusting, degreasing and surface activation treatment of the magnesium alloy, then carries out hot-dip galvanizing, adopts stannate plating solution for copper preplating, further adopts watt plating solution for nickel electroplating and adopts ultrasonic agitation during the entire process of the hot-dip galvanizing, the copper preplating and the nickel electroplating. The method does not adopt cyanide plating solution and is characterized by small and dense crystals of all the plating layers, strong anti-plating liquid corrosion and the like.

Description

technical field [0001] The invention relates to a method for anticorrosion of a magnesium alloy surface, in particular to a method for electroplating a surface of a magnesium alloy. Background technique [0002] Magnesium alloy has small specific gravity, good shock absorption performance, high specific strength, specific stiffness and specific modulus of elasticity, good thermal conductivity, electromagnetic shielding performance and so on. However, magnesium alloys have high chemical activity, low electrode potential, and loose oxide film on the surface, resulting in low protection performance, which restricts the application and development of magnesium alloys. This has aroused people's attention to the surface corrosion and protection of magnesium alloy parts, and a lot of research has been done on the surface of magnesium alloys, such as anodic oxidation, chemical conversion film, organic coating, surface plating, etc., especially the use of electroplating nickel method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/30C25D5/42C25D5/12C25D3/38C25D3/58C23C28/02
Inventor 吴化王淮李雪松杨悦
Owner CHANGCHUN UNIV OF TECH
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