CPC Subgroup
C23C 22/02 using non-aqueous solutions
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 non-aqueous solutions
2 direct subcodes
Child Classifications
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- C23C 22/03 containing phosphorus compounds
- C23C 22/04 containing hexavalent chromium compounds