1. Characteristics and main uses of copper plating:The copper coating has a beautiful rose red color, soft characteristics, is quite plastic, easy to polish and polish, and has excellent heat transfer and electrical conductivity. However, it is easy to oxidize in the air, and it is fast and dull, so it is not suitable as a "surface" layer of art protection coating.
The copper coating is mainly used as the "bottom" layer for double-layer plating of steel parts, and is also often used as the "bottom" layer for tin plating, electroplating and gold plating. ) The adhesion of the coating is also beneficial to the accumulation of the surface coating. When the copper coating has no holes, it can improve the corrosion resistance of the surface coating. For example, in the safety protection-Art Deco double-layer plating, the advantages of the thick copper thin nickel plating process depend on this, and can save Precious metal nickel.
2. The characteristics and main uses of nickel plating:Nickel metal has a strong passivation work ability, which can be quickly converted into a thin passivation film on the surface of the product, which can resist the corrosion of air and some acids, so the reliability of the nickel coating in the air is very high . In the simple nickel-salt lithium battery electrolyte, a very fine crystal coating can be obtained, which has high-quality polishing properties. The polished nickel coating has the same gloss as mirror glass, and it can always maintain its gloss in the air. In addition, the nickel coating also has high strength and wear resistance. According to the characteristics of nickel coating, it is mainly used as the bottom layer, inner layer and overall surface layer of safety protection-Art Deco coating, such as nickel-chromium coating, nickel-copper-nickel-chromium coating, copper-nickel- Chrome coating and copper-nickel coating, etc.
Because the porosity of the nickel coating is high, it can only be considered as non-porous when the thickness of the coating is above 25 μm, so it is generally unnecessary to use the nickel coating as a protective coating.
The total production of nickel coatings is quite large, and the amount of nickel consumed by electroplating nickel accounts for about 10% of the global total nickel output value.