Before plating, the surface of the substrate should be thoroughly removed from grease, oxides and other impurities to ensure the bonding strength of the plating layer and avoid peeling or blistering.
For severely worn or corroded parts, it is necessary to remove the chrome as a whole, weld the damaged area and then re-chrome plating and fine polishing, which can restore the original brightness and enhance corrosion resistance.
Black passivation is a special passivation process after galvanizing that gives the workpiece a unique appearance and performance by forming a black film layer on the surface of the galvanized layer.