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Shenzhen Jinghui Precision Technology Co., Ltd

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Degreasing treatment of metal surface before electroplating
Time:2022-08-12    Views:1485

1、 What is the function of electroplated layer?

1. Improve the corrosion resistance of metal parts in the service environment;

2. Decorate the appearance of parts to make them bright and beautiful;

3. Improve the working performance of parts, such as hardness, wear resistance, conductivity, electromagnetic property, heat resistance, etc.

2、 What are the requirements for the plating layer?

1. The coating and the substrate, including the coating and the substrate, shall have good bonding force;

2. The coating on the main surface of the parts shall have relatively uniform thickness and fine structure;

3. The coating shall have the specified thickness and as few pores as possible;

4. The coating shall have specified indexes, such as surface roughness, hardness, color and salt spray test.

3、 What are cathode coating and anode coating?

Cathodic coating refers to a kind of coating whose potential is higher than that of the base metal under certain conditions, and vice versa. The difference between the potential of the coating under the medium conditions and the potential of the base metal shall determine the coating.

4、 Select the required plating type according to the application of the coating

1. Protective coating: it is mainly used to protect the base metal from corrosion, and does not specify the decoration requirements for products, such as zinc plating and cadmium plating;

2. Protective decorative coating: in addition to protecting the base metal, it also makes the parts beautiful, such as nickel plating, nickel / chromium plating, copper / nickel / chromium plating, etc;

3. Functional coating: in addition to a certain protective effect, it is mainly used for special work purposes, such as tin plating, silver plating, hard chromium plating, etc.

5、 Properties and applications of common electroplated coatings

1. Zinc coating

The zinc coating is an anodic coating on steel parts under atmospheric conditions. After color passivation, the protective performance of the coating is obviously improved and the appearance is improved. It is mainly used to prevent the corrosion of steel parts. Its coating is low in price, excellent in corrosion resistance, and widely used.

2. Cadmium coating

In the environment of ocean and high temperature atmosphere, cadmium coating is an anode coating for steel parts. The coating is relatively stable, has strong corrosion resistance and good lubrication performance. It is widely used in aviation and electronic industry.

3. Tin coating

Tin coating is a cathodic coating for steel parts. Therefore, only when the coating has no pores can the steel parts be mechanically protected from corrosion. It has high chemical stability, has little effect with sulfur and sulfide, has good welding performance and has shielding effect on nitriding.

4. Copper plating

Copper coating is a cathode coating for zinc, iron and other metals. It is often used as the bottom layer or intermediate layer of copper / nickel protective decorative coating on steel or some plastics. It can also be used in printed circuits, electroforming molds and other aspects.

5. Nickel plating

Nickel coating is a cathodic coating for steel parts. It has higher hardness, higher corrosion resistance than copper, and can resist alkali and acid. It is commonly used for copper / nickel / chromium plating of steel parts - the intermediate layer of decorative coatings and the pre plating before acid copper plating.

6. Chromium plating

Chromium coating is a cathodic coating for steel parts. It has high heat resistance, good hardness at normal temperature, good wear resistance and strong light reflection. It is widely used to improve the wear resistance, light reflection, repair size and decoration of parts.

7. Silver plating

Silver coating is a cathode coating for commonly used metals. It has excellent conductivity and brazing performance and stable chemical properties. It is mainly used for conductive parts and welding parts in the electrical industry, and also for protective decorative coatings, such as musical instruments, tableware, optical instruments and processes