not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates

Full Title

Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals > using aqueous solutions > using aqueous acidic solutions with pH less than 6 > not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates

Child Classifications

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• C23C 22/50 Treatment of iron or alloys based thereon
• C23C 22/52 Treatment of copper or alloys based thereon
• C23C 22/53 Treatment of zinc or alloys based thereon
• C23C 22/54 Treatment of refractory metals or alloys based thereon
• C23C 22/56 Treatment of aluminium or alloys based thereon
• C23C 22/57 Treatment of magnesium or alloys based thereon
• C23C 22/58 Treatment of other metallic material