DIFF Subgroup
C23C 22/05 using aqueous solutions
Introduced: January 1990
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
IPC and CPC are identically structured here. All 3 subcodes exist in both systems.
2 shared codes have differing titles between IPC and CPC.
IPC defines codes here since 1985.
Child Classifications
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- C23C 22/06 using aqueous acidic solutions with pH less than 6 since 1985 IPC+CPC Available in IPC and CPC
- C23C 22/60 using alkaline aqueous solutions with pH greater than 8 since 1985 IPC+CPC Available in IPC and CPC
- C23C 22/68 using aqueous solutions with pH between 6 and 8 since 1985 IPC+CPC Available in IPC and CPC