DIFF Subgroup
C23C 22/82 After-treatment
Introduced: January 1985
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 > After-treatment
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
IPC defines codes here since 1985.
Child Classifications
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