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Chemical nickel-plating solution electroplating chromium on surface of magnesium alloy die casting

A technology of electroless nickel plating and die casting, which is applied in the field of electroless nickel plating solution for electroplating chromium on the surface of magnesium alloy die castings to achieve a strong bonding effect

Inactive Publication Date: 2014-07-02
无锡市锡山区鹅湖镇荡口青荡金属制品厂
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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
Comparison scheme
Effect test

Embodiment 1

[0015] An electroless nickel plating solution for electroplating chromium on the surface of a magnesium alloy die-casting part, the plating solution of the electroless nickel plating consists of: nickel sulfate 40g / L, sodium hypophosphite 68g / L, trisodium citrate 35g / L, lactic acid 38g / L, acetic acid 36g / L, sodium fluoride 6.0g / L, NH 4 HF 2 6.0g / L, thiourea 7mg / L, the balance is water; the process conditions are: pH value 4.5-5.5; temperature 60-70℃, time 2.0h.

Embodiment 2

[0017] A kind of electroless nickel plating solution for electroplating chromium on the surface of a magnesium alloy die casting, the plating solution of the described electroless nickel plating consists of: nickel sulfate 50g / L, sodium hypophosphite 62g / L, trisodium citrate 41g / L, lactic acid 32g / L, acetic acid 42g / L, sodium fluoride 2.0g / L, NH 4 HF 2 9.0g / L, thiourea 3mg / L, the balance is water; the process conditions are: pH value 4.5-5.5; temperature 60-70℃, time 4.0h.

Embodiment 3

[0019] An electroless nickel plating solution for electroplating chromium on the surface of a magnesium alloy die-casting part, the plating solution of the electroless nickel plating consists of: nickel sulfate 45g / L, sodium hypophosphite 65g / L, trisodium citrate 38g / L, lactic acid 35g / L, acetic acid 39g / L, sodium fluoride 4.0g / L, NH 4 HF 2 7.5g / L, thiourea 5mg / L, and the balance is water.

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PUM

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Abstract

The invention discloses a chemical nickel-plating solution electroplating chromium on the surface of a magnesium alloy die casting. The chemical nickel-plating solution comprises the following components: 40-50g / L of nickel sulfate, 62-68g / L of sodium hypophosphite, 35-41g / L of trisodium citrate, 32-38g / L of lactic acid, 36-42g / L of acetic acid, 2.0-6.0g / L of sodium fluoride, 6.0-9.0g / L of NH4HF2, 3-7mg / L of thiourea and the balance of water.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to an electroless nickel plating solution for electroplating chromium on the surface of a magnesium alloy die casting. 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...

Claims

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Application Information

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IPC IPC(8): C25D5/42C23C18/36
Inventor 钱永清
Owner 无锡市锡山区鹅湖镇荡口青荡金属制品厂