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)

Child Classifications

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• C23C 8/02 Pretreatment of the material to be coated (C23C8/04 takes precedence)
• C23C 8/04 Treatment of selected surface areas, e.g. using masks
• C23C 8/06 using gases (C23C8/36 takes precedence)
• C23C 8/40 using liquids, e.g. salt baths, liquid suspensions
• C23C 8/60 using solids, e.g. powders, pastes (using liquid suspensions of solids C23C8/40)
• C23C 8/80 After-treatment