If the coating by coating the composition of the coating can be divided into a single metal coating, alloy coating and composite coating three categories.

E functional coating single metal plating of high-grade metal mirror plating has been more than 170 years of history, has a history of more than 100 years of history, The periodic table has 33 kinds of metal mirror can be obtained from the aqueous solution of electrodeposition.

Commonly used electro-galvanized, nickel, chromium, copper, tin, iron, cobalt, cadmium, lead, gold, silver and other l0 species. In the cathode at the same time the accumulation of two or more elements formed by the coating for the alloy coating. The alloy coating has the structure and properties of a single metallized mirror coating, such as an amorphous Ni-P alloy, a stainless steel alloy not present in the phase diagram, and a special decorative appearance, and particularly high corrosion resistance And excellent weldability, magnetic alloy coating and so on.

Composite coating is the solid particles in the bath with metal or alloy co-deposition, constitute a metal-based composite appearance of the process of information to meet the specific application requirements. Based on the electrochemical properties between the coating and the base metal classification, electroplating high-grade mirror can be divided into anodic coating and cathodic coating two categories. Where the coating metal relative to the base metal potential is negative, the composition of the corrosion micro-cell coating is the anode, so called anode coating, such as iron and steel pieces on the galvanized layer; and the coating metal on the base metal potential is positive, Formed corrosion micro-cell coating for the cathode, so called cathodic coating, such as iron and steel on the nickel layer and tin layer.