Process for chemically plating nickel on magnesium alloy

A technology for electroless nickel and magnesium alloy plating, applied in liquid chemical plating, metal material coating process, coating, etc., to reduce health effects and reduce pollution

Pending Publication Date: 2021-06-11
SHENYANG FORTUNE PRECISION EQUIP CO LTD
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[0009] A process for electroless nickel plating on magnesium alloys, comprising the following steps: step 1, polishing, grinding, and degreasing the surface of a magnesium alloy piece; In the solution, the magnesium alloy to be plated is used as the anode, the stainless steel plate is used as the cathode, and the saturated calomel electrode is used as the reference electrode; a potential polarization of -0.4 to -1.0 is applied for 30 to 120s;

[0010] Step 2, removing the applied voltage, directly performing electroless nickel plating on the anodized magnesium alloy parts in the electroless nickel plating solution, and plating for 30-50 minutes to obtain a dense and bright coating with a thickness of 8-15um;

[0011] Step 3, taking out the plated magnesium alloy parts, washing with deionized water, rinsing and air-drying naturally.

[0012] The degreasing reagent used in the step 1 is an alkaline degreasing reagent, and the stainless steel cathode plate used is 304 stainless s...

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Abstract

The invention relates to a process for chemically plating nickel on a magnesium alloy. The process comprises the following steps that step 1, the surface of a magnesium alloy part is polished, ground and degreased; then the magnesium alloy part is put into a chemical nickel plating solution with the temperature of 80-90 DEG C and the pH value of 5-6, the magnesium alloy part to be plated is taken as an anode, a stainless steel plate is taken as a cathode, and a saturated calomel electrode is taken as a reference electrode; a potential of-0.4 to-1.0 is applied and polarization is carried out for 30-120 s; step 2, external voltage is removed, the magnesium alloy part subjected to anodic polarization is directly subjected to chemical nickel plating in the chemical nickel plating solution, plating is conducted for 30-50 min, a compact and bright plating layer is obtained, and the thickness of the plating layer is 8-15 microns; and 3, the plated magnesium alloy part is taken out, washed with deionized water, rinsed and naturally air-dried. According to the process for chemically plating nickel on the magnesium alloy, zinc immersion or passivation treatment is not needed, the process is simplified, and the cost is reduced; and the magnesium alloy is suitable for large-scale mass production.

Description

technical field [0001] The invention is mainly applied to the fields of electromechanical, material, petrochemical and aerospace, and is especially applied to the electroless nickel plating treatment of magnesium alloy structural parts in the aviation industry. Background technique [0002] Magnesium alloys are more and more widely used in aviation, automobiles, and electronics industries. This is because magnesium alloys have characteristics of low density and good rigidity. But magnesium is a very active metal, which will be strongly corroded in acidic medium, especially in systems containing chloride ions. Therefore, various surface protections should be carried out on magnesium alloys. This patent applies electroless nickel plating to magnesium alloys, because electroless nickel plating can not only obtain high corrosion resistance and wear resistance, but also can obtain a coating with uniform thickness on castings with complex shapes. Contents of the invention [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/32C25D3/12C23C18/18
CPCC23C18/32C25D3/12C23C18/1848
Inventor 郭昊
Owner SHENYANG FORTUNE PRECISION EQUIP CO LTD
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