Galvanizing passivation is a film forming process used in galvanizing. Because zinc is a reactive metal, if zinc plating is not well post-treated, the coating will soon become dark, and white corrosion products will appear one after another.
In order to reduce the chemical activity of zinc, chromate solution is often used to passivate, so that a chromate conversion film is formed on the surface of the zinc layer. The official name of this film is called \"chromate conversion film\