Electrogalvanizing: also known as cold galvanizing in the industry, is the use of electrolysis, the formation of uniform, dense, well combined metal or alloy deposition layer on the surface of the parts. Compared with other metals, zinc is a relatively cheap and easy plating of a metal, a low value corrosion prevention electroplating, is widely used to protect iron and steel parts, especially to prevent atmospheric corrosion, and used for decoration. Plating techniques include groove plating (or hanging plating), roll plating (suitable for small parts), blue plating, automatic plating and continuous plating (suitable for wire and strip). Principle: chemical oil removal → hot water washing → water washing → electric oil removal → hot water washing → water washing → strong corrosion → water washing → electrogalvanized iron alloy → water washing → light out → passivation → water washing → drying.