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Chemical nickel phosphor plating method for magnesium alloy

A technology for electroless nickel-phosphorus and magnesium alloy plating, applied in liquid chemical plating, metal material coating process, coating and other directions, can solve the problems of troublesome post-processing, high process cost, complex process, etc. The coating is uniform and dense, and the effect of good corrosion resistance

Inactive Publication Date: 2006-05-10
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process is costly and complex, and requires steps such as cyanide copper plating and activation, especially the solution used as a substrate for cyanide copper plating, because it contains a large amount of copper cyanide, sodium cyanide, potassium cyanide, etc. Cyanide, very toxic, troublesome post-processing, very serious environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) at first prepare nickel-plating phosphorus electroless plating solution, the chemical composition and weight formula thereof of this plating solution are as follows:

[0023] Main salt basic nickel carbonate 15g / L;

[0024] Reducing agent sodium hypophosphite 25g / L;

[0025] Complexing agent citric acid 10g / L;

[0026] Stabilizer thiourea 2mg / L;

[0027] Preservative ammonium bifluoride 15g / L;

[0028] water balance;

[0029] (2) The extruded AZ31D magnesium alloy sample is first degreased, and then pickled; pickling is to put the surface-cleaned magnesium alloy sample into the mixed acid solution of hydrofluoric acid and phosphoric acid; The solution is prepared with a volume ratio of 40% hydrofluoric acid and 68% phosphoric acid; after pickling for 44 seconds, rinse with water;

[0030] (3) Carry out zinc-dipping treatment then, this moment is one-time zinc-dipping; Zinc-dipping is in the mixed solution containing zinc oxide 95g / L, sodium hydroxide 230g / L, po...

Embodiment 2

[0037] The process and steps of this embodiment are completely the same as those of Embodiment 1 above, except that the formulation of the electroless plating solution is different.

[0038] The chemical composition of the plating solution of the present embodiment and its weight formula are:

[0039] Main salt basic nickel carbonate 25g / L;

[0040] Reducing agent sodium hypophosphite 35g / L;

[0041] Complexing agent trisodium citrate 15g / L, succinic acid 4g / L;

[0042] Stabilizer thiourea 3mg / L;

[0043] Preservative ammonium bifluoride 25g / L;

[0044] water balance;

[0045] Then, its process and steps are exactly the same as (2), (3), (4), (5), (6) and (7) in the aforementioned embodiment 1.

[0046] Finally, in this embodiment, a nickel-phosphorus alloy coating with metallic luster can be obtained on the surface of the AZ31D magnesium alloy sample, and the thickness of the coating is 15-20 microns.

[0047] The nickel-plated magnesium alloy sample obtained in this ex...

Embodiment 3

[0049] The process and steps of this embodiment are completely the same as those of Embodiment 1 above, except that the formulation of the electroless plating solution is different.

[0050] The chemical composition of the plating solution of the present embodiment and its weight formula are:

[0051] Main salt basic nickel carbonate 30g / L;

[0052] Reducing agent sodium hypophosphite 40g / L;

[0053] Complexing agent lactic acid 15g / L;

[0054] Stabilizer sodium iodate 8mg / L;

[0055] Preservative ammonium bifluoride 30g / L;

[0056] water balance;

[0057] Then, its process and steps are exactly the same as (2), (3), (4), (5), (6) and (7) in the aforementioned embodiment 1.

[0058] Finally, in this embodiment, a nickel-phosphorus alloy coating with metallic luster can be obtained on the surface of the AZ31D magnesium alloy sample, and the thickness of the coating is 15-20 microns.

[0059] The nickel-plated magnesium alloy sample obtained in this example passed the ther...

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Abstract

This invention relates to a magnesium alloy chemical nickel and phosiphoric coating method, which belongs to the chemistry coating film technology filed. The charater of this invention has the following steps: 1) preparing the chemical plating solution; wherein, the composing and weight as follows: the main salt alkali carbonic nickel 10í½30g / Lú”The reducer hypo-phosphorous natrium 20í½40g / Lú”The complex emulsion 15í½25g / Lú¼the succinic acid 4í½8g / Lú¼the acetic natrium 10í½20g / Lú¼the citric acid 3í½15g / Lú¼then choosing one or more from the raleted complex emulsion; The stabilizer thiourea 0.5í½3.0mg / Lú¼the iodic acid natrium 5í½15mg / Lú¼then choosing one or two from the stabilizer; The antiseptic hydrogen fluoride ammonium 15í½30g / Lú”The rest is water. 2) Degreasing and pouring the magnesium and cleaning its surface. 3) Dipping zinc, withdrawing zinc and twice dipping zinc.4) Chemical plating nickel; the temperature is 80í½90íµ, H 6í½7ú¼the time is 45í½60min. 5) Washing, doing heat treatment with it for 6h under 200íµ; at last obtaining the nickel phosiphoric alloy coating with the thickness of 15í½20 micron.

Description

technical field [0001] The invention relates to a method for chemically plating nickel and phosphorus on a magnesium alloy, and belongs to the technical field of chemical plating technology. Background technique [0002] Magnesium alloy has many excellent physical and mechanical properties, high specific strength and specific stiffness, easy cutting, easy casting, good shock absorption, can withstand large shock and vibration loads, and has good electrical and thermal conductivity, magnetic shielding With excellent performance, it is an ideal modern structural material, and has been widely used in automobiles, machinery manufacturing, aerospace, electronics, communications, military, optical instruments and computer manufacturing and other fields. In order to apply magnesium alloys to different occasions, it is often necessary to change its surface state to improve properties such as corrosion resistance, wear resistance, weldability, and decoration. However, since the elec...

Claims

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Application Information

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IPC IPC(8): C23C18/50C23C18/18
Inventor 成旦红王建泳张炜李科军张庆
Owner SHANGHAI UNIV
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