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PCE
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DIFF Subgroup
C23C 8/40

using liquids, e.g. salt baths, liquid suspensions

Introduced: January 1985

Full Title

Full titles differ between systems:

IPC:

Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals > using liquids, e.g. salt baths, liquid suspensions

CPC:

Solid state diffusion of only non-metal elements into metallic material surfaces (diffusion of silicon C23C10/00); Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals (C23C14/00 takes precedence) > using liquids, e.g. salt baths, liquid suspensions

IPC and CPC are identically structured here. All 3 subcodes exist in both systems.

IPC defines codes here since 1985.

Child Classifications

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  • C23C 8/58 more than one element being applied in more than one step since 1985 IPC+CPC Available in IPC and CPC