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Novel chemical nickel-plating method for magnesium alloy

A technology for electroless nickel plating and magnesium alloy plating, which is applied in the field of metal surface treatment and electroless nickel plating for magnesium alloys. It can solve problems such as the need to improve the bonding force of the plating layer, poor bonding force of the plating layer, and complicated process, so as to improve the salt spray corrosion resistance. Good coating performance and the effect of overcoming high porosity

Inactive Publication Date: 2012-07-18
CHENGDU QINGYUAN MAGNESIUM SCI & TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

The direct electroless nickel plating method adopts direct electroless plating of nickel sulfate solution, which has the characteristics of simple process and low cost, but the coating bonding force of this method is poor, and a large amount of hexavalent chromium in the plating solution brings great harm to the environment. On this basis, a galvanizing-copper plating-nickel plating method has been developed. Although this method has improved the bonding force of the nickel plating layer, it still has the following technical defects:
[0004] 1. The bonding strength of the coating needs to be improved, and it is difficult to meet the requirements of the national military standard;
[0005] 2. The nickel-plated layer on the surface has large unit cells, high porosity, and poor salt spray corrosion resistance, which is difficult to meet the requirements of the national military standard;
[0006] 3. The plating solution uses a large amount of fluorine salt and cyanide, which seriously endangers the environment;
[0007] 4. The process is complicated and the cost is high

Method used

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  • Novel chemical nickel-plating method for magnesium alloy

Examples

Experimental program
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Effect test

example 1

[0025] Example 1: Extruded profile with domestic AZ31B magnesium alloy, cut into 100×50×4mm 3 Samples, according to the following steps for electroless nickel plating treatment:

[0026] 1. Alkaline washing: dissolve 15g of industrial grade sodium hydroxide (99%) in 100ml distilled water, dissolve 15g of industrial grade trisodium phosphate in 100ml distilled water; dissolve 1g of analytically pure sodium lauryl sulfate in 100ml distilled water ; Pour the above three solutions into a 1000ml beaker, add 700ml of distilled water, and mix completely to form a 1000ml alkali washing solution. Heat the alkali washing solution to 70°C in a constant temperature water bath, and immerse the sample in the alkaline washing solution for 7 minutes; after taking out the sample, rinse it with a large amount of distilled water at room temperature.

[0027] 2. Pickling: Dissolve 50ml of analytically pure acetic acid into 100ml of distilled water, 5g of potassium sodium tartrate into 100ml of d...

example 2

[0031] Example 2: Using domestic AZ91 magnesium alloy ingot, cut into 100×50×4mm 3 For the samples, perform electroless nickel plating according to the following steps.

[0032] The processing method is the same as Example 1.

example 3

[0033] Example 3: Cast ingot with domestic ZK60 magnesium alloy, cut into 100×50×4mm 3 For the samples, perform electroless nickel plating according to the following steps.

[0034] 1. Alkaline washing: dissolve 15g of industrial grade sodium carbonate in 100ml distilled water, dissolve 10g of industrial grade trisodium phosphate in 100ml distilled water; dissolve 1g of analytically pure OP-10 in 100ml of distilled water; Dissolve 1g of sodium in 100ml of distilled water; pour the above three solutions into a 1000ml beaker, add 600ml of distilled water, and mix completely to form 1000ml of alkali washing solution. Heat the alkali washing solution to 70°C in a constant temperature water bath, and immerse the sample in the alkaline washing solution for 7 minutes; after taking out the sample, rinse it with a large amount of distilled water at room temperature.

[0035] 2. Pickling: the same as item 2 in Example 1;

[0036] 3. Activation: Dissolve 10ml of analytically pure sulfu...

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Abstract

The invention relates to a novel chemical nickel-plating method for magnesium alloy, which comprises alkaline washing, acid washing, activation, conversion, nickel plating and other processes, solves the technical problems of easy blistering, poor bonding force and poor corrosion resistance in the chemical nickel-plating process of the magnesium alloy and has the advantages of being simple in process, low in cost and the like. A nickel-phosphorus alloy coating prepared by means of the method is smooth, flat, even, compact and strong in bonding force with basic materials, and meets the technical requirements of a military standard GJB150A-2009 thermal shock test (220 DEG C) and a salt spray test (96 hours).

Description

technical field [0001] The invention relates to a new electroless nickel plating method for magnesium alloy, which belongs to metal surface treatment technology. Background technique [0002] Magnesium alloy has the characteristics of low density, high specific strength and rigidity, excellent impact resistance, electromagnetic shielding performance, and good machining performance. It has a wide range of applications in military weapons and equipment, aerospace, consumer electronics, machinery, high-speed rail, and automobiles. prospect. my country is the world's largest producer and exporter of primary magnesium, accounting for 75% of the world's total output. To develop magnesium alloys, our country not only has huge resource advantages, but also has huge market demand. Therefore, solving the key technology of magnesium alloy materials and surface treatment technology is an urgent task for the magnesium industry, and it is also an urgent task for the magnesium industry at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/18C23C18/36
Inventor 钟辉方小强
Owner CHENGDU QINGYUAN MAGNESIUM SCI & TECH
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