CPC Subgroup
C23C 22/06 using aqueous acidic solutions with pH less than 6
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
6 direct subcodes
Child Classifications
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- C23C 22/07 containing phosphates
- C23C 22/24 containing hexavalent chromium compounds
- C23C 22/34 containing fluorides or complex fluorides
- C23C 22/40 containing molybdates, tungstates or vanadates
- C23C 22/46 containing oxalates
- C23C 22/48 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates