CPC Subgroup
C23C 22/34 containing fluorides or complex fluorides
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 > containing fluorides or complex fluorides
2 direct subcodes
Child Classifications
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- C23C 22/36 containing also phosphates
- C23C 22/37 containing also hexavalent chromium compounds