In order to ensure that the decorative coating (plating) layer and the surface of the iron products have a good bonding force, it is necessary to remove the oxide, welding slag, rust, grease, dirt and water on the surface of the iron products as much as possible before the coating (plating) is implemented, otherwise it is easy to cause the coating (plating) layer foaming, cracking, lamination and peeling phenomenon.

1. The main methods of rust removal and removal of oxide welding slag are manual treatment, mechanical treatment, spray treatment, chemical treatment (pickling), electrochemical treatment and flame treatment.

2. oil removal for iron products, generally can be used organic solution, lye, electrochemical and other methods, the current market for various metal cleaning agents are also more suitable.