CPC Main Group
C23C 22/00 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
7 direct subcodes
Child Classifications
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- C23C 22/02 using non-aqueous solutions
- C23C 22/05 using aqueous solutions
- C23C 22/70 using melts
- C23C 22/73 characterised by the process
- C23C 22/78 Pretreatment of the material to be coated
- C23C 22/82 After-treatment
- C23C 22/86 Regeneration of coating baths