Cyanideless electro-coppering method for magnesium alloy casting parts

A magnesium alloy and copper electroplating technology, which is applied in the field of magnesium alloy copper electroplating, can solve the problems of high porosity, poor bonding force of the coating, unstable plating solution, etc., and achieve low porosity, good bonding force, throwing ability and deep Excellent plating ability

Inactive Publication Date: 2008-08-20
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing magnesium alloy cyanide-free copper plating technology has the disadvantages of poor coating bonding force, high porosity, and unstable plating solution that limit its large-scale application; and provide a cyanide-free magnesium alloy casting Copper Plating Method

Method used

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  • Cyanideless electro-coppering method for magnesium alloy casting parts
  • Cyanideless electro-coppering method for magnesium alloy casting parts
  • Cyanideless electro-coppering method for magnesium alloy casting parts

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specific Embodiment approach 1

[0014] Embodiment 1: In this embodiment, the method for cyanide-free copper plating of magnesium alloy castings is realized by the following steps: 1. Alkali washing: under the condition of 40-60°C, the magnesium alloy castings are soaked in alkaline washing solution 8 to 10 minutes, then washed three to five times with water; 2. Organic pickling: at room temperature, soak the magnesium alloy castings treated in step 1 in organic pickling solution for 5 to 30 seconds, and then wash with water three to five times 3. Activation: Activate the magnesium alloy castings treated in step 2 in a magnesium alloy surfactant for 5-15 minutes at room temperature, and then wash with water three to five times; 4. Dip zinc alloy: a. Under the condition of 90 ℃, the magnesium alloy casting is soaked in the zinc alloy immersion solution for 5~15min; Activate in the solution for 2-10s, and then operate once according to the process of step a; 5. Copper electroplating: at a temperature of 20-50°C...

specific Embodiment approach 2

[0017] Depend on figure 1 It can be seen that the porosity of the copper coating obtained in this embodiment is low. When the thickness of the electroplated copper layer reaches more than 10 microns, the porosity of the copper layer is zero, and the protective performance of the coating is superior, which can well meet the requirements for the porosity of the coating. Require. Depend on figure 2 It can be explained that the crystal grains of the copper coating obtained microscopically are relatively fine, and the appearance of the coating is relatively smooth. Depend on image 3 It can be seen that the glossiness of the copper plating layer obtained in this embodiment is good, and the current adaptability range is wide. Adopt the scratch test method to verify that this embodiment obtains the binding force of the copper coating: use a steel needle to draw criss-cross parallel lines 2 mm apart on the copper coating surface, and the scratches reach the substrate, and the resu...

specific Embodiment approach 3

[0018] Embodiment 3: The difference between this embodiment and Embodiment 1 is that each liter of alkali washing solution in step 1 is composed of 30-60 g of sodium hydroxide, 15-25 g of sodium phosphate and the rest of water. Others are the same as in the first embodiment.

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Abstract

A method for no cyanide copper plating of a magnesium alloy casting relates to a method for the electro-coppering of a magnesium alloy. The invention solves the defects of the existing copper plating technique of the magnesium alloy of poor combining force of a plating coat, high void ratio and unstable plating bath. The method of the invention is as follows: first, alkaline cleaning; second, organic acid washing; third, activating in a magnesium alloy surface active agent under the condition of room temperature and water washing; fourth, soaking zinc alloy; fifth, plating in electro-coppering bath under the condition that the temperature is 20-50 DEG C and the intensity of cathode current is Dk=0.5-2.5A / dm<2>. The invention is not only used for strike copper plating of the magnesium alloy but also for thickening an electro-coppering coat. The copper plating coat has bright appearance, good combining force, low void ratio and convenient maintenance. The copper plating bath has good uniform coverage ability and covering power. The method has simple technique. The magnesium alloy casting that adopts the method to plate copper has wide application range and is applicable to the fields of electronic product, car and parts thereof, vessels, aerospace, etc.

Description

technical field [0001] The invention relates to a method for electroplating copper on a magnesium alloy. Background technique [0002] Magnesium alloys have many unique and superior properties. Therefore, magnesium alloys have been widely used in aviation industry, automobile industry and electronic communication industry. However, the corrosion resistance of magnesium is poor, and it is prone to severe corrosion in humid air, sulfur-containing atmosphere and marine atmosphere, thus greatly limiting its application. Only proper treatment of the surface of magnesium alloys can make magnesium alloys meet the needs of corrosion resistance and wear resistance. At present, there are many methods for magnesium alloy surface treatment. The commonly used method for magnesium alloy electroplating is to dip zinc first, then pre-plate copper with cyanide system, and then electroplate other metals. However, the above pretreatment process uses highly toxic cyanide. People are constant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/38C25D5/34
Inventor 李宁于元春高鹏胡会利曹立新马颖
Owner HARBIN INST OF TECH
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