Chemical plating nickel-tungsten-phosphorus alloy solution for magnesium alloy and treatment process thereof

A technology of electroless nickel-tungsten-phosphorus plating and alloy solution, which is applied in the field of metal surface treatment, can solve the problems of high cost and high price, and achieve the effects of low cost, high plating speed and convenient operation

Inactive Publication Date: 2012-06-27
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process is relatively simple, but the main salt used is basic nickel carbonate or insoluble nickel acetate, the cost is high, and the raw material price of basic carbonate is more than three times higher than that of nickel sulfate

Method used

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  • Chemical plating nickel-tungsten-phosphorus alloy solution for magnesium alloy and treatment process thereof
  • Chemical plating nickel-tungsten-phosphorus alloy solution for magnesium alloy and treatment process thereof
  • Chemical plating nickel-tungsten-phosphorus alloy solution for magnesium alloy and treatment process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh the reagents according to the following formula: 5 grams of nickel sulfate, 5 grams of sodium tungstate, 20 grams of sodium citrate, 8 grams of sodium carbonate, 12 grams of sodium hypophosphite, 0.5 mg of thiourea, and 8 grams of ammonium bifluoride; The reagents are respectively dissolved in a small amount of water, then mixed, and diluted to 1 liter with water to obtain a magnesium alloy electroless nickel-tungsten-phosphorus plating solution. Adjust the pH to 8-9 with concentrated ammonia water for later use.

[0025] Thoroughly degrease the AZ91D magnesium alloy sample in alkaline degreasing solution and clean water respectively, then put it into a nitric acid solution with a mass concentration of 15% for 40 seconds, wash it with water, and put it into hydrofluoric acid with a mass concentration of 40% Process for 5-10 minutes and wash off in water. Then immerse in the clarified plating solution prepared and filtered above, perform chemical plating at 85°C-9...

Embodiment 2

[0027] Weigh the reagents according to the following formula: 15 grams of nickel sulfate, 7.5 grams of sodium tungstate, 40 grams of sodium citrate, 10 grams of sodium carbonate, 15 grams of sodium hypophosphite, 0.5 mg of thiourea, and 10 grams of ammonium bifluoride; The reagents are respectively dissolved in a small amount of water, then mixed, and diluted to 1 liter with water to obtain a magnesium alloy electroless nickel-tungsten-phosphorus plating solution. Adjust the pH to 8-9 with concentrated ammonia water for later use.

[0028] The AZ91D magnesium alloy sample was thoroughly degreased in alkaline degreasing solution and clear water respectively, and then placed in a nitric acid solution with a mass concentration of 15% for 40 seconds. After washing with water, it was treated in hydrofluoric acid with a mass concentration of 40% for 5 -10 minutes, wash off in water. Then immerse in the above-prepared and filtered clarified plating solution, perform chemical plating...

Embodiment 3

[0030] Weigh the reagents according to the following formula: 20 grams of nickel sulfate, 12 grams of sodium tungstate, 50 grams of sodium citrate, 20 grams of sodium carbonate, 25 grams of sodium hypophosphite, 1 mg of thiourea, and 10 grams of ammonium bifluoride; The reagents are respectively dissolved with a small amount of water, and then mixed and diluted to 1 liter to obtain a magnesium alloy electroless nickel-tungsten-phosphorus plating solution. Adjust the pH to 8-9 with concentrated ammonia water for later use.

[0031] The AZ91D magnesium alloy samples were thoroughly degreased in alkaline degreasing solution and clear water respectively, then placed in a nitric acid solution with a mass concentration of 15% for 40 seconds, washed with water, and then treated in hydrofluoric acid with a mass concentration of 40% Leave on for 5-10 minutes and wash off in water. Then immerse in the prepared and filtered clarified plating solution above, perform chemical plating at 8...

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Abstract

The invention relates to a chemical plating nickel-tungsten-phosphorus alloy solution for a magnesium alloy surface and a treatment process thereof. The prepared chemical plating nickel-tungsten-phosphorus alloy solution for the magnesium alloy is an aqueous solution; the pH value of the aqueous solution is 8-9; and each liter of aqueous solution contains 5-25g of nickel sulfate, 5-20g of sodium tungstate, 20-60g of sodium citrate, 5-20g of sodium carbonate, 10-30g of hypophosphite, 0.5-0.15mg of thiourea and 6-10g of ammonium bifluoride. A process for treating the magnesium alloy surface comprises the following steps of: treating a magnesium alloy component with a clean surface in a nitric acid solution of which the mass concentration is 15 percent for 40-60 seconds; cleaning in water; treating in hydrofluoric acid of which the mass concentration is 40 percent for 5-10 minutes; and cleaning in water, and soaking into the plating nickel-tungsten-phosphorus solution for performing chemical coating at the temperature of 85-90 DEG C. The chemical plating nickel-tungsten-phosphorus alloy solution has the advantages of simple components, convenience for preparing, low cost, variability of component concentration in a large range, high stability, long-term storage and high plating speed.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and relates to a magnesium alloy surface non-electrolytic treatment technology, in particular to a magnesium alloy electroless nickel-tungsten-phosphorus alloy plating solution and a treatment process thereof. Background technique [0002] Magnesium alloy has the smallest density among practical metal structural materials, which can meet the requirements of household appliances, communication electronic devices and automobile lightweight. Magnesium alloy also has superior properties such as high specific strength, high specific stiffness, good damping, good thermal conductivity and good vibration damping, and can replace steel, aluminum alloy, plastic and other parts, so it is widely used in automobiles, electronics, aerospace and other fields It has broad application prospects. With the development of science and technology, the automobile industry of various countries is develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/50
Inventor 张文雪王新刚何成何金国连建设江中浩
Owner CHANGAN UNIV
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