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 pl

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

Example Embodiment

[0042] Example 1

[0043] According to the composition of the alkaline electroless nickel plating solution in Table 2, weigh each component, dissolve each component in deionized water, adjust the pH to 10.5 with sodium hydroxide, and then make up 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] Take a magnesium alloy sample and perform nickel plating treatment, including the following steps:

[0046] 1) Ultrasonic degreasing: The treatment temperature is 50~60℃, and the time is 3~6min;

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

[0048] 3) Activation: potassium pyrophosphate 10~15g / L, sodium fluoride 3~5g / L, sodium nitrate 3~5g / L, sodium gluconate 20~30g / L, org...

Example Embodiment

[0056] Example 2

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

[0058] See Table 3 for the composition of alkaline film remover 1#.

[0059] Take a magnesium alloy sample and perform nickel plating treatment, including the following steps:

[0060] 1) Ultrasonic degreasing: The treatment temperature is 50~60℃, and the time is 3~6min;

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

[0062] 3) Ultrasonic alkaline film removal: treatment temperature is 55~65℃, time is 0.5~3min, 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℃, and the time is 0.5~1min;

[0064] 5) Primer with alkaline chemica...

Example

[0070] Examples 3-8

[0071] The process parameters of Examples 3-8 are similar to those of Example 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] Table 2 Composition of the electroless nickel plating solution in each embodiment

[0073]

[0074] Note:

[0075] 1. Alkaline electroless nickel plating solution: the hypophosphite used in Examples 1 to 4 is sodium hypophosphite, and in Examples 5 to 8 is potassium hypophosphite; the water-soluble citrate used in Examples 1 to 5 is citric acid Sodium, potassium citrate used in Examples 6-8; sodium gluconate used in Examples 1 to 4; potassium gluconate used in Examples 5-8; malic acid used in Examples 1-5 The salt is sodium malate, and examples 6 to 8 are potassium malate; the organic polyphosphonate used in examples 1 and 2 is pota...

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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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