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CPC Subgroup
C23C 22/60

using alkaline aqueous solutions with pH greater than 8

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 alkaline aqueous solutions with pH greater than 8

4 direct subcodes

Child Classifications

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  • C23C 22/62 Treatment of iron or alloys based thereon
  • C23C 22/63 Treatment of copper or alloys based thereon
  • C23C 22/64 Treatment of refractory metals or alloys based thereon