CPC Subgroup
C23C 22/08 Orthophosphates
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 phosphates > Orthophosphates
5 direct subcodes
Child Classifications
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- C23C 22/10 containing oxidants
- C23C 22/12 containing zinc cations
- C23C 22/18 containing manganese cations
- C23C 22/20 containing aluminium cations
- C23C 22/22 containing alkaline earth metal cations