|  | C |
SECTION C — CHEMISTRY AND METALLURGY

METALLURGY

|  | C23 |
WORKING OR TREATMENT OF METALS, OTHER THAN BY MECHANICAL MEANS; COVERING MATERIALS WITH METALS (decorating textiles by metallising Fulltext... Hierarchy... Expanded...D06Q 1/04); INHIBITING CORROSION OR INCRUSTATION IN GENERAL (treating metal surfaces or coating of metals by electrolysis or electrophoresis Fulltext... Hierarchy... Expanded...C25D, Fulltext... Hierarchy... Expanded...C25F)

|  | C23B |
( transferred to Fulltext... Hierarchy... Expanded...C25D )

|  | C23C |
APPARATUS AND PROCESSES FOR WHICH PROVISION IS NOT MADE ELSEWHERE, e.g. IN CLASSES Fulltext... Hierarchy... Expanded...B05, Fulltext... Hierarchy... Expanded...B44 OR IN SUB-CLASSES Fulltext... Hierarchy... Expanded...C03C, Fulltext... Hierarchy... Expanded...C23D, Fulltext... Hierarchy... Expanded...C23F, Fulltext... Hierarchy... Expanded...C25D, Fulltext... Hierarchy... Expanded...F27B, FOR COVERING METALS OR COVERING OTHER MATERIALS WITH METALS; DIFFUSION PROCESSES FOR SURFACE TREATMENT OF METALS

|  | C23D |
ENAMELLING OF, AND APPLYING A VITREOUS LAYER TO, METALS (chemical composition of the enamels Fulltext... Hierarchy... Expanded...C03C)

|  | C23F |
CHEMICAL SURFACE TREATMENT OF METALS NOT COVERED BY SUB-CLASSES Fulltext... Hierarchy... Expanded...C23D, Fulltext... Hierarchy... Expanded...C25D; INHIBITING CORROSION OR INCRUSTATION IN GENERAL

|  | C23F |
Note(s) This sub-class is the general place for inhibiting corrosion or incrustation in general, whether of or on metallic or non-metallic surfaces. It does not include, however: protective layers or coating compositions or methods of applying them; these are classified in the relevant class, e.g. Fulltext... Hierarchy... Expanded...B05, Fulltext... Hierarchy... Expanded...B44, Fulltext... Hierarchy... Expanded...C09D; mechanical devices or constructional features of particular articles; these are classified in the relevant class, e.g. pipes, pipe fittings Fulltext... Hierarchy... Expanded...F16L; articles characterised by being made of materials selected for their properties of resistance to corrosion or incrustation; these are classified in the relevant class, e.g. turbine blades Fulltext... Hierarchy... Expanded...F01D 5/28.

|  | C23G |
CLEANING AND DE-GREASING OF METALLIC OBJECTS BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS (polishing compositions Fulltext... Hierarchy... Expanded...C09G; detergents in general Fulltext... Hierarchy... Expanded...C11D)