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Magnesium-alloy chemical nickel plating solution and nickel plating process thereof

A technology of electroless nickel and magnesium alloy plating, which is applied in the direction of liquid chemical plating, metal material coating technology, coating, etc., can solve the problems of localized corrosion, large limitations, and fast deposition speed, etc., to reduce corrosion and improve Stability and the effect of improving the yield rate

Active Publication Date: 2013-07-24
江门市瑞期精细化学工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a large amount of hydrofluoric acid or fluoride is added to the electroless nickel plating solution to protect the magnesium alloy from corrosion, it is still susceptible to corrosion under high temperature and neutral conditions.
Especially for the magnesium-aluminum alloy AZ-91D die castings used in actual production, due to the uneven distribution of surface components due to segregation phases, localized corrosion will occur in the chemical nickel plating solution, and nickel cannot be completely coated, resulting in unstable production yields
Moreover, when other metal coatings are continuously electroplated on this chemical nickel layer, as the thickness increases, the bonding force between the coating and the substrate becomes worse and worse. The main reason is that the deposition speed is fast and the stress of the nickel layer is relatively large. This process has great limitations in actual production

Method used

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  • Magnesium-alloy chemical nickel plating solution and nickel plating process thereof
  • Magnesium-alloy chemical nickel plating solution and nickel plating process thereof
  • Magnesium-alloy chemical nickel plating solution and nickel plating process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] According to the composition of the alkaline electroless nickel plating solution in Table 2, each component was weighed, each component was dissolved in deionized water, and the pH was adjusted to 10.5 with sodium hydroxide, and then supplemented to 100% with deionized water;

[0044] According to the composition of the neutral electroless nickel plating solution in Table 2, dissolve each component in deionized water, adjust the pH to 6.0 with ammonia water, and then make up to 100% with deionized water.

[0045] Get magnesium alloy sample, carry out nickel plating treatment, comprise the following steps:

[0046] 1) Ultrasonic degreasing: the treatment temperature is 50-60°C, and the time is 3-6 minutes;

[0047] 2) Pickling: Phosphoric acid 5-10g / L, citric acid 10-15g / L, urotropine 0.1-0.5g / L, the balance is water; the temperature is 20-30°C, and the time is 1-2min;

[0048] 3) Activation: potassium pyrophosphate 10-15g / L, sodium fluoride 3-5g / L, sodium nitrate 3-5g / ...

Embodiment 2

[0057] The preparation of alkaline electroless nickel solution and neutral electroless nickel solution is the same as in Example 1.

[0058] The composition of alkaline film remover 1# is shown in Table 3.

[0059] Get magnesium alloy sample, carry out nickel plating treatment, comprise the following steps:

[0060] 1) Ultrasonic degreasing: the treatment temperature is 50-60°C, and the time is 3-6 minutes;

[0061] 2) Pickling: Phosphoric acid 5-10g / L, citric acid 10-15g / L, urotropine 0.1-0.5g / L, the balance is water; the temperature is 20-30°C, and the time is 1-2min;

[0062] 3) Ultrasonic alkaline film removal: the treatment temperature is 55-65°C, the time is 0.5-3min, and the ultrasonic frequency is 20-40KHz;

[0063] 4) Activation: potassium pyrophosphate 10-15g / L, sodium fluoride 3-5g / L, sodium nitrate 3-5g / L, sodium gluconate 20-30g / L, organic phosphonate 50-80g / L , the balance is water; the temperature is 50-60°C, and the time is 0.5-1min;

[0064] 5) Base electr...

Embodiment 3～8

[0071] The process parameter of embodiment 3~8 is similar to embodiment 2. The composition of the electroless nickel plating solution used in each embodiment is shown in Table 2, the composition of the alkaline film remover is shown in Table 3, and the process parameters and nickel plating effect are shown in Table 4.

[0072] The composition of electroless nickel plating solution in each embodiment of table 2

[0073]

[0074] Note:

[0075] 1, alkaline electroless nickel plating solution: used hypophosphite is sodium hypophosphite among the embodiment 1~4, is potassium hypophosphite among the embodiment 5~8; Used water-soluble citrate among the embodiment 1~5 is citric acid Sodium, potassium citrate among the embodiments 6~8; Water-soluble gluconate used in the embodiments 1~4 is sodium gluconate, potassium gluconate among the embodiments 5~8; Malic acid used in the embodiments 1~5 The salt is sodium malate, which is potassium malate in Examples 6 to 8; the organic poly...

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PUM

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Abstract

The invention discloses a magnesium-alloy chemical nickel plating solution and a nickel plating process thereof. The magnesium-alloy chemical nickel plating solution disclosed by the invention comprises alkaline chemical nickel plating liquid and neutral chemical nickel plating liquid; and a special complexing system is used in a plating liquid system, so that the corrosion action on magnesium metal is reduced, and the stability of plating liquid and the bonding force between a base material and a nickel layer are improved. The invention further provides a magnesium-alloy two-step chemical nickel plating process, wherein the alkaline chemical nickel plating liquid is used for priming, and then, the neutral chemical nickel plating liquid is used for carrying out thickening treatment. Furthermore, according to the nickel plating process, a pretreatment process of ultrasonic alkaline membrane removal is adopted before two-step chemical nickel plating, so that an oxidized membrane and a residual demolding agent on the surface of a magnesium-alloy workpiece are cleaned thoroughly, and then, the yield of nickel-plated products is further increased.

Description

technical field [0001] The invention belongs to the field of metal protection, in particular to a magnesium alloy electroless nickel plating solution and a nickel plating process thereof. Background technique [0002] Magnesium alloy is known as the green metal structural material in the 21st century. It has low density, high specific strength and specific stiffness, and excellent damping, machinability, and casting performance. It has been increasingly widely used in the automotive industry, aerospace industry, and electronics industry. Applications. [0003] However, the chemical nature of magnesium alloy is active and its corrosion resistance is poor, so it needs anti-corrosion treatment on its surface, such as electroplating, electroless plating, conversion coating, anodic oxidation, thermal spraying and vapor deposition ion implantation, etc. Among them, the electroless nickel plating method can significantly improve the corrosion resistance and wear resistance of magn...

Claims

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Application Information

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IPC IPC(8): C23C18/36
Inventor 洪条民
Owner 江门市瑞期精细化学工程有限公司
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