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Magnesium alloy chemical nickel plating solution and preparation method thereof, and nickel plating method

A technology of electroless nickel plating solution and magnesium alloy, which is applied in the direction of liquid chemical plating, metal material coating process, coating, etc., can solve the problems of unguaranteed coating bonding force, unfavorable nickel layer deposition, falling off, etc., to achieve Guarantee the density of the coating, good nickel plating effect, and reduce corrosion effect

Active Publication Date: 2016-07-27
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Normally, magnesium alloys will react violently with the acid / alkaline solution in the process, and the same violent reaction will also occur in the nickel plating solution, but this is not conducive to the deposition of the nickel layer on the surface of the substrate, often resulting in Pinholes and missing plating are now present, and at the same time, the bonding force of the coating cannot be guaranteed, and problems such as bubbles and shedding are prone to occur

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0017] According to the preparation method provided by the present invention, preferably, the soluble nickel salt 15-25g / L, complexing agent 20-65g / L, buffer 10-20g / L, resist 10-30g / L, reduction Agent 20-30g / L, stabilizer 0.001-0.003g / L and salicylaldehyde 2-7g / L.

[0018] According to the preparation method provided by the present invention, preferably, the soluble nickel salt is one or more of nickel sulfate and nickel chloride; and the complexing agent is ammonium citrate, ethylenediamine, sodium acetate, and lactic acid. One or more of, malic acid, citric acid, succinic acid, and propionic acid; the buffer is boric acid; the anti-corrosion is hydrofluoric acid, ammonium bifluoride, sodium fluoride, potassium fluoride One or more; the reducing agent is one or more of sodium hypophosphite, sodium borohydride, borane, and hydrazine; the stabilizer is one of thiourea, potassium thiocyanate, and urea Or multiple.

[0019] According to the preparation method provided by the present...

Embodiment 1

[0024] 1. Preparation of magnesium alloy electroless nickel plating solution

[0025] Add ammonium citrate, ethylenediamine, sodium acetate, lactic acid, thiourea, boric acid and sodium hypophosphite to the aqueous solution of nickel sulfate and stir well; then add hydrofluoric acid, ammonium bifluoride and salicylaldehyde, and finally adjust with ammonia The pH value is 8, and nickel plating solution A1 can be obtained. Among them, nickel sulfate 20g / L, ammonium citrate 25g / L, ethylenediamine 3g / L, sodium acetate 7g / L, lactic acid 10g / L, thiourea 0.002g / L, boric acid 15g / L, sodium hypophosphite 25g / L, hydrofluoric acid 8g / L, ammonium bifluoride 10g / L and salicylaldehyde 4g / L.

[0026] 2. Nickel plating on magnesium alloy surface

[0027] 1) Substrate pretreatment: select AZ91D magnesium alloy as the substrate, and put the substrate into the degreasing solution (formulation: sodium carbonate 20g / L, sodium phosphate 20g / L, sodium citrate 10g / L, ten Sodium dialkyl sulfate 1g / L), so...

Embodiment 2

[0032] Add ammonium citrate, ethylenediamine, sodium acetate, lactic acid, thiourea, boric acid and sodium hypophosphite to the aqueous solution of nickel sulfate and stir well; then add hydrofluoric acid, ammonium bifluoride and salicylaldehyde, and finally adjust with ammonia The pH value is 8.5, and nickel plating bath A2 can be obtained. Among them, nickel sulfate 18g / L, ammonium citrate 22g / L, ethylenediamine 2g / L, sodium acetate 6g / L, lactic acid 8g / L, thiourea 0.001g / L, boric acid 12g / L, sodium hypophosphite 22g / L, hydrofluoric acid 7g / L, ammonium bifluoride 9g / L and salicylaldehyde 4g / L.

[0033] According to the method of Example 1, nickel plating solution A2 is used to plate the magnesium alloy with nickel to obtain plated article Y2.

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PUM

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Abstract

The invention provides a magnesium alloy chemical nickel plating solution; the nickel plating solution contains a soluble nickel salt, a complexing agent, a buffering agent, a corrosion inhibitor, a reducing agent, a stabilizer and salicylaldehyde. The invention also provides a preparation method of the nickel plating solution and a magnesium alloy surface nickel plating method. Salicylaldehyde contained in the nickel plating solution can effectively reduce corrosion of a magnesium alloy zinc-dipping layer in the chemical nickel plating solution, promotes a reaction to be gently carried out, and is beneficial to deposition of a nickel layer, so as to improve plating layer density and solve the problems of pinholes and plating leakage. At the same time, with the addition of salicylaldehyde, the usage times of the nickel plating solution can be further prolonged.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to an electroless nickel plating solution for the surface of a magnesium alloy, a preparation method and a nickel plating method thereof. Background technique [0002] Magnesium alloy has been widely concerned because of its unique properties and abundant resources, and it is highly respected as an environmentally friendly material in this century. However, due to the immature electroplating process of magnesium alloy, the problem of poor corrosion resistance has become the main obstacle to exert its superiority, thus limiting its wider application to a large extent. [0003] Therefore, it is particularly important to effectively decorate and prevent the surface of magnesium alloys. The commonly used treatment technology is electroplating, but magnesium alloys are not stable in conventional electroplating baths, and the surface needs to be pretreated to adapt to conventional ...

Claims

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Application Information

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IPC IPC(8): C23C18/34
Inventor 韦家亮
Owner BYD CO LTD