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Electroplating method

A technology of copper plating and plating solution, applied in the field of surface treatment, which can solve problems such as dynamic embrittlement and thermal cracking of the coating surface, and achieve the effect of improving wear resistance and salt spray corrosion resistance

Inactive Publication Date: 2010-12-01
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the electroplating cupronickel-tin product is prone to dynamic embrittlement under the action of compressive stress, causing the defect of thermal cracking on the surface of the coating, thereby providing an electroplating method that is not easy to cause embrittlement and does not generate thermal cracking on the surface of the coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) polishing

[0039] The AZ91D magnesium alloy die-casting is mechanically polished with a 1*10-inch buckle cloth wheel combined with a 1*10-inch small wool wheel polishing method to remove burrs, scale, etc. produced by the raw material itself during the die-casting process and reduce surface roughness High degree, improve the mirror bright effect and enhance the binding force of subsequent electroplating.

[0040] (2) wax removal

[0041] The above-mentioned polished magnesium alloy die castings were dewaxed with Procleaner BR#1 universal dewaxing water from Yongxing Chemical Co., Ltd., the volume of the cylinder was 30ml / L, the working temperature was 80°C, and the wax was removed in an ultrasonic environment for 5min.

[0042] (3) Degreasing:

[0043] The above-mentioned magnesium alloy die casting after dewaxing is degreased by cathodic electrolysis, the electrolyte is: sodium phosphate 30g / L, sodium carbonate 30g / L; the degreasing temperature is 60°C, the degr...

Embodiment 2

[0061] Steps (1)-(6) are the same as in Example 1.

[0062] (7) Pre-plating copper:

[0063] The magnesium alloy die-casting after above-mentioned galvanizing is carried out pre-plating copper, and the plating solution of pre-plating copper is: copper pyrophosphate 15 grams / liter, potassium pyrophosphate 380 grams / liter, ethylenediaminetetraacetic acid 3 grams / liter, lemon Potassium sulfamate 7 g / L, potassium sulfamate 0.6 g / L and potassium dithiocarbonate 0.15 g / L. Adjust the pH value of the plating solution with phosphoric acid to make the pH 7.5, the plating time is 5min, and the current density is 1A / dm 2 .

[0064] (8) Acid bright copper:

[0065] Bright copper plating is carried out on the magnesium alloy die-casting parts after the above pre-copper plating. This process adopts the UB-X series acid bright copper plating electroplating process produced by Yongxing Chemical. The working temperature of acid bright copper plating is 30℃, the working time is 30min, and th...

Embodiment 3

[0073] Steps (1)-(6) are the same as in Example 1.

[0074] (7) Pre-plating copper:

[0075] Pre-plate copper on the magnesium alloy die-casting after the above-mentioned zinc dipping, and the plating solution for pre-plating copper is: copper pyrophosphate 20 grams / liter, potassium pyrophosphate 300 grams / liter, ethylenediaminetetraacetic acid 2 grams / liter, lemon potassium sulfamate 5 g / L, potassium sulfamate 0.3 g / L and potassium dithiocarbonate 0.1 g / L. Adjust the pH value of the plating solution with phosphoric acid to make the pH 7.0, the plating time is 5min, and the current density is 1A / dm 2 .

[0076] (8) Acid bright copper:

[0077] Bright copper plating is carried out on the magnesium alloy die-casting parts after the above-mentioned pre-copper plating. This process adopts the UB-X series acidic bright copper plating electroplating process produced by Yongxing Chemical. The working temperature of acid bright copper plating is 30℃, the working time is 30min, and...

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Abstract

The invention relates to an electroplating method, which belongs to the field of electroplating, and the method comprises the following steps: (a) copper preplating; (b) acid bright copper plating; (c) chemical immersion tin; and (d) white copper tin electroplating. An electroplated product obtained by using the electroplating method with concentration can well solve the phenomena of greater stress of an electroplated white copper tin layer and easy production of dynamic embrittlement, and effectively improve the wear resistance and the anti-salt spray corrosion performance of the plated layer. The electroplating method can be widely applied in decoration of surfaces of metal products.

Description

technical field [0001] The invention relates to a surface treatment method, in particular to an electroplating method. Background technique [0002] Due to its excellent decorative and protective properties, bright nickel plating has been widely used in the decorative protection industry. Whether it is used as an intermediate coating or a decorative coating, the bright nickel coating has high use value. It is widely used in hardware, lighting and clothing, instrumentation, glasses and other industries. At the same time, the bright nickel coating is also an excellent anti-diffusion coating, which is widely used in the jewelry manufacturing industry. [0003] However, direct contact of metal nickel with human skin can cause nickel sensitivity symptoms. There are clear regulations in the world, especially developed countries and regions such as Europe and the United States. Decorative parts such as watches, glasses, pens, and even clothing, etc. Nickel plating is permitted. ...

Claims

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Application Information

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IPC IPC(8): C23C28/02C23C18/52C23C18/38C25D3/38C25D5/10C25D3/56
Inventor 罗鹏李爱华孙继鹏周林
Owner BYD CO LTD
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