1. Bright chrome: bright like a mirror;
2. Sub-chrome: matt;
3. Electrophoresis: black, with brightness, under the action of external DC, the charged particles move in the direction of the dispersed medium to the cathode or anode to promote the separation of substances;
4. Phosphating: black, but the gloss is dark, the material is immersed in the phosphating solution, and deposited on the surface to form a layer of water-insoluble crystalline phosphorus, which is a process of hydrochloric acid conversion.
5. Gray Nickel: It is a new surface treatment method with strong anti-rust ability and will increase the service life of the product.
6. Others are black, pearl nickel and titanium plating.
