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Nickel-tungsten-phosphorus bath for chemical plating of magnesium alloy

A technology for electroless nickel-tungsten-phosphorus and magnesium alloy plating, applied in the field of magnesium alloy multi-chemical plating solution formula, can solve the problems of serious environmental pollution, poor corrosion resistance, high pretreatment process, etc., to reduce process complexity and Effects of environmental pollution, improvement of corrosion resistance, and small porosity of the coating

Inactive Publication Date: 2010-07-07
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional magnesium alloy electroless plating process is long, difficult to operate, difficult to control the process, and high in cost
The traditional Ni-P coating has a large porosity and poor corrosion resistance, and the protection of the nickel layer to the magnesium alloy substrate is limited.
[0005] According to the retrieval results, the electroless nickel-tungsten-phosphorus bath formula for magnesium alloys mainly uses basic nickel carbonate or sodium acetate as the main salt. In recent studies, nickel sulfate is often used as the main salt and hydrogen fluoride is used as the corrosion inhibitor, which is inconvenient to prepare. Requires high pretreatment process, strict requirements, and serious environmental pollution

Method used

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  • Nickel-tungsten-phosphorus bath for chemical plating of magnesium alloy
  • Nickel-tungsten-phosphorus bath for chemical plating of magnesium alloy
  • Nickel-tungsten-phosphorus bath for chemical plating of magnesium alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1: Take medicine according to the following ratio: nickel sulfate 11.5g, sodium tungstate 7.6g, sodium citrate 30.3g, sodium hypophosphite 15.2g, sodium carbonate 15.2g, ammonium bifluoride 6.0g, potassium iodate 0.0001 g. Dissolve the above-mentioned medicines with a small amount of distilled water respectively, then mix and dilute to 1L, and adjust the pH value of the plating solution to 9.0 with ammonia water.

[0021] Divide the area to 7cm 2 Magnesium alloy AZ91D is degreased by acetone, degreased by alkali, one-step activation treatment, put into chemical plating solution heated to 85±2℃, and plated by ultrasonic vibration for 2 hours.

[0022] After testing, the binding force of the coating is qualified, and the microhardness (Hv) of the coating on the surface is 465.

[0023] from figure 1 It can be clearly seen that the AZ91D sample is actively dissolved, while the electroless Ni-W-P sample not only greatly improves the self-corrosion potential, bu...

Embodiment 2

[0025] Embodiment 2: In addition, nickel sulfate 18, sodium tungstate 13g, sodium citrate 40g, sodium hypophosphite 18g, sodium carbonate 18g, ammonium bifluoride 10g, thiourea 0.0001g

[0026] Divide the area to 7cm 2 Magnesium alloy AZ91D is degreased by acetone, degreased by alkali, one-step activation treatment, put into chemical plating solution heated to 85±2℃, and plated by ultrasonic vibration for 2 hours. The substrate can be successfully electroless plated, and each index is better than the performance of the coating in Example 1.

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Abstract

The invention provides a chemical nickel tungsten phosphorus plating solution for magnesium alloy, which consists of 10-20 g / L of nickel sulfate, 7-15 g / L of sodium tungstate, 29-50 g / L of sodium citrate, 14-30 g / L of sodium hypophosphite, 14-30 g / L of sodium carbonate, 5-12 g / L of ammonium bifluoride, additive accounting for 0.00005-0.003 percent of total weight and the balance being water. The solution uses the nickel sulfate instead of basic nickel carbonate for introduction and has the sodium tungstate added in, so as to ensure that a plating layer is better in corrosion resistance and wear resistance, and the plating solution is convenient to prepare and much lower in cost. The solution solves the problem that the chemical nickel plating layer is low in corrosion resistance and wear resistance.

Description

(1) Technical field [0001] The invention relates to an electroless plating solution formula, in particular to a magnesium alloy multi-element electroplating solution formula. (2) Background technology [0002] Magnesium alloy is the lightest structural metal in industrial applications. Due to its small specific gravity, high strength, good thermal conductivity, and good damping and shock absorption and electromagnetic shielding functions, it can replace engineering plastics that are difficult to recycle and be used as shell structures. It is used in mobile phones, notebook computers and other electronic products to meet the requirements of light, thin, short, small and good heat dissipation of electronic products, and improve the working efficiency and service life of the machine. At present, my country's primary magnesium production ranks first in the world. [0003] In order to prevent the corrosion of magnesium alloys, electroless nickel plating is generally used to prot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/36
Inventor 张涛游仲邵亚薇孟国哲王福会
Owner HARBIN ENG UNIV