C
SECTION C — CHEMISTRY AND METALLURGY
  
METALLURGY
 C23
WORKING AND TREATMENT OF METALS, OTHER THAN BY MECHANICAL MEANS; COVERING MATERIALS WITH METALS (decorating textiles by metallising D06Q 1/04); INHIBITING CORROSION OR INCRUSTATION IN GENERAL
 C23B
ELECTROLYTIC SURFACE TREATMENT OF OR WITH METALS, e.g. ELECTROPLATING (Electrolytic processes or apparatus in general B01K); ELECTROLIFORMING; COATING METALS BY ELECTROPHORESIS

 C23C
APPARATUS AND PROCESSES FOR WHICH PROVISION IS NOT MADE ELSEWHERE, e.g. IN CLASSES B05, B44, C03C, C08, OR IN C23B, C23D, C23F, F27B, FOR COVERING METALS OR COVERING 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 C03C)

 C23F
CHEMICAL SURFACE TREATMENT OF METALS NOT COVERED BY C23B OR C23D; 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;

  1. protective layers or coating compositions or methods of applying them; these are classified in the relevant class, e.g. B05, B44, C09D.
  2. mechanical devices or constructional features of particular articles; these are classified in the relevant class, e.g. pipes, pipe fittings F16L.
  3. 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 F01D 5/28.


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