This product is used to remove the weld spot on the stainless steel and improve the passivation ability of parts. This product does not contain fluorine, chlorine, phosphorus and nitrogen elements. It is a rare environment-friendly pickling and passivation solution at present. The surface of the parts treated with this product has a certain gloss, silver white, and the antibacterial rate can reach more than 80% (Staphylococcus aureus and Escherichia coli).