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Magnesium alloy chemical nickel plating solution and electroplating pretreatment method

A technology of electroless nickel and magnesium alloy plating, applied in liquid chemical plating, metal material coating process, coating and other directions, can solve the problems of large environmental pollution, complex process, weak bonding force between the coating and the substrate, etc., to achieve environmental pollution Less, the process is simple, the surface of the workpiece is smooth and beautiful

Inactive Publication Date: 2010-08-25
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the magnesium alloy electroplating pretreatment method provided in the prior art, such as large environmental pollution, complicated process, or weak bonding force between the coating and the substrate, and provide a method with less environmental pollution, simple process and Magnesium alloy electroless nickel plating solution with strong bonding force between coating and substrate and magnesium alloy electroplating pretreatment method using the electroless nickel plating solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment is used to illustrate the magnesium alloy electroless nickel plating solution and the magnesium alloy electroplating pretreatment method provided by the present invention.

[0027] The experimental material is AZ91D magnesium alloy, and the specific operation steps are as follows:

[0028] Degreasing:

[0029] The degreasing solution formula is: 15 g / L sodium pyrophosphate, 8 g / L sodium carbonate, 3 g / L sodium silicate, 0.3 g / L OP-10 surfactant and the balance of deionized water. Except for ionized water, other components are dissolved in deionized water according to the proportion of the formula, and mixed to obtain an aqueous solution, which is put into a tank for use.

[0030] Heat the aqueous solution prepared above to 50°C, then soak the AZ91D magnesium alloy casting to be treated in the aqueous solution, keep the solution temperature at 50°C, and carry out ultrasonic degreasing for 10 minutes.

[0031] 2. Hot water washing: immerse the castings deg...

Embodiment 2

[0049] Describe the magnesium alloy electroless nickel plating solution and the magnesium alloy electroplating pretreatment method provided by the present invention.

[0050] Prepare electroless nickel plating solution and carry out magnesium alloy electroplating pretreatment according to the method described in embodiment 1, difference is that the prescription of electroless nickel plating solution is: 15 grams per liter of nickel sulfate, 25 grams per liter of sodium hypophosphite, 3 grams / L lactic acid, 2 g / L sodium citrate, 1 mg / L thiourea, 0.8 mg / L cerium nitrate, 15 g / L ammonium hydrogen fluoride, 6 g / L sodium fluoride and the balance deionized water. And the pH value of the electroless nickel plating solution is adjusted to 5.5 with ammonia water having a concentration of 10% by weight, the temperature of the electroless nickel plating solution is 70° C., and the time of the electroless nickel plating is 20 minutes.

Embodiment 3

[0052] This embodiment is used to illustrate the magnesium alloy electroless nickel plating solution and the magnesium alloy electroplating pretreatment method provided by the present invention.

[0053] Preparation of electroless nickel plating solution and pretreatment of magnesium alloy electroplating were carried out according to the method described in Example 1, except that after electroless nickel plating and subsequent cold water rinsing, a pyrophosphoric acid copper plating step and subsequent cold water rinsing were added.

[0054] The formula of pyrophosphate copper plating solution is: 80 g / L copper pyrophosphate trihydrate, 300 g / L potassium pyrophosphate, 3 mL / L ammonia water, 0.9 mL / L CuMac PY XD7443 starter and the balance deionized water. Except deionized water, other components are respectively dissolved in deionized water according to the formula ratio, and mixed to obtain pyrophosphoric acid copper plating solution.

[0055] Adjust the pH value to 9.0 with ...

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Abstract

The invention provides a magnesium alloy chemical nickel plating solution, which contains water, nickel salt, a reducing agent and a compounding agent; wherein, the nickel plating solution also contains cerium nitrate. The invention also provides a magnesium alloy electroplating pretreating method, which comprises the following steps: under the chemical nickel plating condition, the magnesium alloy and the chemical nickel plating solution are contacted; wherein, the chemical nickel plating solution is the one provided by the invention. In the chemical nickel plating solution provided by the invention, as the cerium nitrate is added, the binding force of a base material and a plating layer is obviously increased. The magnesium alloy electroplating pretreating method provided by the invention has simple technique, convenient operation, little pollution to the environment, high binding force of the base material and the plating layer, smooth and beautiful workpiece surfaces, low cost andhigh economic benefit.

Description

technical field [0001] The invention relates to a magnesium alloy electroless nickel plating solution and a magnesium alloy electroplating pretreatment method using the solution. Background technique [0002] Magnesium alloy is a light metal with a density of only 1.7 g / cm 3 , it has high specific strength and specific stiffness, strong absorption of impact and vibration energy, therefore, it is more and more widely used in aviation, aerospace, automobile, instrumentation, electronics and other industries. Magnesium alloy is becoming the third largest metal engineering material after steel and aluminum, and is known as "green engineering material in the 21st century". [0003] However, the chemical properties of magnesium are lively, its oxide film is loose and porous, and its ability to protect the substrate is weak, so it is not suitable for corrosive environments. Therefore, in order to make magnesium alloys widely used in industry, it is necessary to select or develop ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/36C25D5/42
Inventor 游友圆
Owner BYD CO LTD
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