Direct chemical nickel-phosphate plating solution and chemical nickel-phosphate plating coating process for magnesium alloy

A technology for electroless nickel-phosphorus and magnesium alloy plating, applied in metal material coating process, liquid chemical plating, coating and other directions, can solve the problems that the electroless nickel-phosphorus alloy coating technology cannot be directly applied to magnesium alloys and environmental hazards, etc. Achieve the effect of remarkable wear resistance, improved corrosion resistance and simple process flow

Active Publication Date: 2013-03-27
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the object of the present invention is to provide a direct electroless nickel-phosphorus plating solution and electroless nickel-phosphorus coating process for magnesium all...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] AZ91D magnesium alloy was selected, and the magnesium alloy was degreased by volume fraction of 50% acetone + 50% petroleum ether. After washing with water, put it into a mixed solution of 50g / L sodium hydroxide, 15g / L potassium carbonate, 20g / L sodium nitrate and the rest of water, and wash it with alkali at 60°C for 6 minutes. After taking it out, wash it fully with water, and put it into the following plating solution for plating:

[0065] NiSO 4 ·6H 2 O 30g / L;

[0066] NaH 2 PO 2 ·H 2 O 20g / L;

[0067] h 4 HF 2 18g / L;

[0068] Sodium citrate 20g / L;

[0069] Glycine 10g / L;

[0070] CH 3 COONa·3H 2 O 5g / L;

[0071] CdCl 2 0.25mg / L;

[0072] The balance is water.

[0073] AZ91D magnesium alloy was plated in the above bath at 92°C, with a deposition rate of 6 μm / h and a deposition time of 3 h. The plating solution is stable, the obtained nickel-phosphorus alloy coating has no defects such as blistering and peeling, the coating...

Embodiment 3

[0085] AZ91D magnesium alloy was selected, and petroleum ether was used to degrease the magnesium alloy. After washing with water, put it into a mixed solution of 70g / L sodium hydroxide, 30g / L potassium carbonate, 15g / L sodium nitrate and the rest of water, and wash it with alkali at 50°C for 10 minutes. After taking it out, wash it fully with water, and put it into the following plating solution for plating:

[0086] Ni(CH 3 COO) 2 4H 2 O 25g / L;

[0087] NaH 2 PO 2 ·H 2 O 25g / L;

[0088] h 4 HF 2 22g / L;

[0089] Sodium citrate 20g / L;

[0090] Glycine 10g / L;

[0091] Sodium succinate 5g / L;

[0092] CH 3 COONa·3H 2 O 10g / L;

[0093] CdCl 2 1mg / L;

[0094] The balance is water.

[0095] AZ91D magnesium alloy was plated in the above bath at 85°C, with a deposition rate of 7 μm / h and a deposition time of 6 h. The plating solution is stable, the obtained nickel-phosphorus alloy coating has no defects such as blistering and peeling...

Embodiment 4

[0097] The ZM6 magnesium alloy was selected, and the magnesium alloy was degreased by volume fraction of 30% acetone + 70% petroleum ether. After washing with water, put it into a mixed solution of 80g / L sodium hydroxide, 5g / L potassium carbonate, 8g / L ammonium nitrate and the rest of water, and wash it with alkali at 65°C for 5 minutes. After taking it out, wash it fully with water, and put it into the following plating solution for plating:

[0098] Ni(CH 3 COO) 2 4H 2 O 25g / L;

[0099] NaH 2 PO 2 ·H 2 O 20g / L;

[0100] NH 4 HF 2 15g / L;

[0101] Sodium citrate 16g / L;

[0102] Sodium succinate 5g / L;

[0103] CH 3 COONa·3H 2 O 15g / L;

[0104] CdCl 2 0.25mg / L;

[0105] The balance is water.

[0106] The AM50 magnesium alloy was plated in the above-mentioned plating solution at 80°C, the deposition rate was 8 μm / h, and the deposition time was 5 h. The plating solution is stable, the obtained nickel-phosphorus alloy coating has no...

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PUM

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Abstract

The invention relates to magnesium alloy surface treatment technology, in particular to a direct chemical nickel-phosphate plating solution and chemical nickel-phosphate plating coating process for magnesium alloy, belonging to the field of magnesium alloy surface treatment. A chemical nickel-phosphate plating coating takes nickel acetate or nickel sulfate as main salts, phosphinic acid as a reducing agent, sodium citrate, glycine or sodium succinate as a complexing agent, ammonium bifluoride as a corrosion inhibitor, sodium acetate as a buffering agent and cadmium chloride as a stabilizer, and the plating application temperature is 80-95 DEG C. The chemical nickel-phosphate plating coating process comprises the steps: organic solvent oil removal, blow-drying, alkaline washing, water washing, chemical nickel-phosphate plating, water washing and roasting in sequence. According to the process, the problems that the chemical nickel-phosphate alloy plating coating technology in the prior can not be directly applied to magnesium alloy and causes harm to the environment can be solved.

Description

technical field [0001] The invention relates to a magnesium alloy surface treatment technology, in particular to a process for direct electroless nickel-phosphorus plating solution and electroless nickel-phosphorus plating layer on a magnesium alloy, and belongs to the field of magnesium alloy surface treatment. Background technique [0002] Magnesium alloy has the characteristics of low density and high specific strength. The density is equivalent to engineering plastics. It is the lightest engineering structure material. It has good thermal conductivity, easy processing, easy casting, good dimensional stability, shock absorption and Electromagnetic shielding and easy recyclability have been more and more widely used in daily life and industrial fields, such as automobiles, mobile phones, computers, sporting goods and other fields, and are known as "green engineering materials" in the 21st century. As an emerging structural material, its poor corrosion resistance seriously ...

Claims

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Application Information

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IPC IPC(8): C23C18/36
Inventor 王成王文王群昌吴航朱圣龙王福会
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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