... aluminum, cold rolled steel with various plating;3.Surface treatment:kinds of plating (Zinc, Nikel, Chrome, Tin ... Painting, Powder, Anodizing, E-coating, Silkscreen, Heat treatment, Black oxid;4.Standard/ specification:OEM service as per ... copper, nickel, chromium plating, aluminum parts surface oxidation treatment, chemical, electrolytic oxidation, static electricity spurting, painting, electrophoresis ...