C
SECTION C — CHEMISTRY; METALLURGY
 C

Note(s)

In section C, the definitions of groups of chemical elements are as follows:

  • Alkali metals: Li, Na, K, Rb, Cs, Fr
  • Alkaline earth metals: Ca, Sr, Ba, Ra
  • Lanthanides: elements with atomic numbers 57 to 71 inclusive
  • Rare earths: Sc, Y, Lanthanides
  • Actinides: elements with atomic numbers 89 to 103 inclusive
  • Refractory metals: Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W
  • Halogens: F, Cl, Br, I, At
  • Noble gases: He, Ne, Ar, Kr, Xe, Rn
  • Platinum group: Os, Ir, Pt, Ru, Rh, Pd
  • Noble metals: Ag, Au, Platinum group
  • Light metals: alkali metals, alkaline earth metals, Be, Al, Mg
  • Heavy metals: metals other than light metals
  • Iron group: Fe, Co, Ni
  • Non-metals: H, B, C, Si, N, P, O, S, Se, Te, noble gases, halogens
  • Metals: elements other than non-metals
  • Transition elements: elements with atomic numbers 21 to 30 inclusive, 39 to 48 inclusive, 57 to 80 inclusive, 89 upwards

  
METALLURGY
 C23
COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL (decorating textiles by metallising D06Q 1/04); CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (for specific applications, see the relevant places, e.g. for manufacturing resistors H01C 17/06); INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL (treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D, C25F)  [2]
 C23

Note(s)

In this class, the following expression is used with the meaning incicated: [4]

  • "metallic material" covers[4]
    1. metals; [4]
    2. alloys, including: [4]
      1. alloys containing at least 50% by weight of one or more of borides, carbides, nitrides, oxides or silicides and binding metal; [4]
      2. non-ferrous alloys containing at least 5% by weight but less than 50% by weight of borides, carbides, nitrides, oxides or silicides of refractory metals, whether added as such or formed in situ[4]

 C23F
NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACES (desurfacing by applying flames B23K 7/00; working metal by laser beam B23K 26/00; working of metal by electro-erosion B 23 P 1/00; producing decorative effects by removing surface-material, e.g. by engraving, by etching, B44C 1/22; electrolytic etching or polishing C25F); INHIBITING CORROSION OF METALLIC MATERIAL; INHIBITING INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25  [4]
 C23F

Note(s)

  1. This subclass covers inhibiting corrosion or incrustation in general, whether of or on metallic or non-metallic surfaces, subject to Note (2) below.
  2. This subclass does not cover:
 C23F 1/00
Etching metallic material by chemical means (manufacture of printing surfaces B41C; manufacture of printed circuits H05K)  [2]
 C23F 1/02
·  Local etching
 C23F 1/04
·  ·  Chemical milling
 C23F 1/06
·  Sharpening files
 C23F 1/08
·  Apparatus, e.g. for photomechanical printing surfaces (photomechanical reproduction G03F)
 C23F 1/10
·  Etching compositions (C23F 1/44 takes precedence)  [4]
 C23F 1/12
·  ·  Gaseous compositions  [4]
 C23F 1/14
·  ·  Aqueous compositions  [4]
 C23F 1/16
·  ·  ·  Acidic compositions (C23F 1/42 takes precedence)  [4]
 C23F 1/18
·  ·  ·  ·  for etching copper or alloys thereof  [4]
 C23F 1/20
·  ·  ·  ·  for etching aluminium or alloys thereof  [4]
 C23F 1/22
·  ·  ·  ·  for etching magnesium or alloys thereof  [4]
 C23F 1/24
·  ·  ·  ·  for etching silicon or germanium  [4]
 C23F 1/26
·  ·  ·  ·  for etching refractory metals  [4]
 C23F 1/28
·  ·  ·  ·  for etching iron group metals  [4]
 C23F 1/30
·  ·  ·  ·  for etching other metallic material  [4]
 C23F 1/32
·  ·  ·  Alkaline compositions (C23F 1/42 takes precedence)  [4]
 C23F 1/34
·  ·  ·  ·  for etching copper or alloys thereof  [4]
 C23F 1/36
·  ·  ·  ·  for etching aluminium or alloys thereof  [4]
 C23F 1/38
·  ·  ·  ·  for etching refractory metals  [4]
 C23F 1/40
·  ·  ·  ·  for etching other metallic material  [4]
 C23F 1/42
·  ·  ·  containing a dispersed water-immiscible liquid  [4]
 C23F 1/44
·  Compositions for etching metallic material from a metallic material substrate of different composition  [4]
 C23F 1/46
·  Regeneration of etching compositions  [4]
 C23F 3/00
Brightening metals by chemical means  [2]
 C23F 3/02
·  Light metals
 C23F 3/03
·  ·  with acidic solutions  [4]
 C23F 3/04
·  Heavy metals
 C23F 3/06
·  ·  with acidic solutions  [4]
 C23F 4/00
Processes for removing metallic material from surfaces, not provided for in group C23F 1/00 or C23F 3/00  [4]
 C23F 4/02
·  by evaporation  [4]
 C23F 4/04
·  by physical dissolution  [4]
 C23F 5/00 - 
C23F 9/00
( transferred to C23C )
 C23F 11/00
Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent (adding inhibitors to mineral oil, fuels, or lubricants C10; adding inhibitors to pickling solutions C23G)
 C23F 11/02
·  in air or gases by adding vapour phase inhibitors
 C23F 11/04
·  in markedly acid liquids
 C23F 11/06
·  in markedly alkaline liquids
 C23F 11/08
·  in other liquids
 C23F 11/10
·  ·  using organic inhibitors
 C23F 11/12 - 
C23F 11/18

Note(s)

In groups C23F 11/12-C23F 11/18, in the absence of an indication to the contrary, a compound is classified in the last appropriate place.

 C23F 11/12
·  ·  ·  Oxygen-containing compounds
 C23F 11/14
·  ·  ·  Nitrogen-containing compounds
 C23F 11/16
·  ·  ·  Sulphur-containing compounds
 C23F 11/167
·  ·  ·  Phosphorus-containing compounds  [4]
 C23F 11/173
·  ·  ·  Macromolecular compounds  [4]
 C23F 11/18
·  ·  using inorganic inhibitors
 C23F 13/00
Inhibiting corrosion of metals by anodic or cathodic protection
 C23F 13/02
·  cathodic  [4]
 C23F 14/00
Inhibiting incrustation in apparatus for heating liquids for physical or chemical purposes (adding scale preventives or removers to water C02F 5/00)  [2]
 C23F 14/02
·  by chemical means
 C23F 15/00
Other methods of preventing corrosion or incrustation
 C23F 17/00
Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25 (C23C 28/00 takes precedence)