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Electroplating process for chrome plating on surface of magnesium alloy pressure casting

An electroplating process, surface chrome plating technology, applied in the field of electroplating, to achieve the effects of strong bonding, uniform coating thickness, and stable performance of the plating solution

Active Publication Date: 2014-07-02
佛山市诺诚科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Magnesium alloy die castings have been widely used in the fields of automobiles, transportation, aerospace and other fields, and the application of some die castings requires electroplating on the surface. However, there are few reports on the electroplating technology of magnesium alloy die castings in the prior art

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0013] An electroplating process for chrome plating on the surface of a magnesium alloy die-casting, said process comprising the following steps: alkaline cleaning → pickling → activation → zinc immersion → cyanide-free copper plating → electroless nickel plating → electrochrome plating, the electrochrome plating bath The composition is: chromium sulfate 130g / L, sodium sulfate 240g / L; ammonium bromide 0.5mol / L; boric acid 1.8mol / L; sodium hypophosphite 0.5mol / L; oxalic acid 1.4mol / L; 0.02mol / L, ferrous sulfate 0.08mol / L, the balance is water; electroplating process: pH value 2.0-3.5; process temperature 45-55 ℃, cathode current density 17-19A / dm 2 , Plating time 15 minutes.

Embodiment 2

[0015] An electroplating process for chrome plating on the surface of a magnesium alloy die-casting, said process comprising the following steps: alkaline cleaning → pickling → activation → zinc immersion → cyanide-free copper plating → electroless nickel plating → electrochrome plating, the electrochrome plating bath The composition is: chromium sulfate 150g / L, sodium sulfate 210g / L; ammonium bromide 0.9mol / L; boric acid 1.2mol / L; sodium hypophosphite 0.9mol / L; oxalic acid 1.0mol / L; 0.06mol / L, ferrous sulfate 0.04mol / L, the balance is water; electroplating process: pH value 2.0-3.5; process temperature 45-55 ℃, cathode current density 17-19A / dm 2 , Plating time 25 minutes.

Embodiment 3

[0017] An electroplating process for chrome plating on the surface of a magnesium alloy die-casting, said process comprising the following steps: alkaline cleaning → pickling → activation → zinc immersion → cyanide-free copper plating → electroless nickel plating → electrochrome plating, the electrochrome plating bath The composition is: chromium sulfate 140g / L, sodium sulfate 225g / L; ammonium bromide 0.7mol / L; boric acid 1.5mol / L; sodium hypophosphite 0.7mol / L; oxalic acid 1.2mol / L; 0.04mol / L, ferrous sulfate 0.06mol / L, the balance is water; electroplating process: pH value 2.0-3.5; process temperature 45-55 ℃, cathode current density 17-19A / dm 2 , Plating time 20 minutes.

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PUM

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Abstract

The invention discloses an electroplating process for chrome plating on the surface of a magnesium alloy pressure casting. The process comprises the steps of alkaline washing, acid pickling, activating, zinc immersing, cyanide-free electro-coppering, chemical nickel-plating and chrome electroplating; a plating solution of the chrome electroplating is composed of 130-150g / L of chromium sulfate, 210-240g / L of sodium sulfate, 0.5-0.9mol / L of ammonium bromide, 1.2-1.8mol / L of boric acid, 0.5-0.9mol / L of sodium hypophosphite, 1.0-1.4mol / L of oxalic acid, 0.02-0.06mol / L of lauryl sodium sulfate, 0.04-0.08mol / L of ferrous sulfate and the balance of water; the electroplating process is as follows: a pH value ranges from 2.0 to 3.5, a process temperature ranges from 45 to 55 DEG C, the cathode-current density ranges from 17 to 19A / dm<2>, and the electroplating time is 15-25 minutes.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to an electroplating process for chrome-plating the surface of magnesium alloy die-casting parts. Background technique [0002] Magnesium alloy is known as the green metal structural material in the 21st century. It has low density, high specific strength and specific stiffness, and excellent damping, machinability, and casting performance. It has been increasingly widely used in the automotive industry, aerospace industry, and electronics industry. application. Magnesium is rich in raw materials and ranks eighth among natural resources, but as a structural material, its poor corrosion resistance restricts its wider use. [0003] The standard electrode potential of magnesium is -2.34V, which has high reactivity. In air or solution, magnesium alloy will quickly form a very thin passivation film, which will lead to the metal coating and magnesium substrate during electroplatin...

Claims

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Application Information

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IPC IPC(8): C25D3/06C25D5/42
Inventor 钱永清
Owner 佛山市诺诚科技有限公司