IPC 6 English version  C23F-C23F01700
SECTION C– CHEMISTRY; METALLURGY

C 23

COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL (by metallising textiles D 06 M 11/83; decorating textiles by locally metallising D 06 Q 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 H 01 C 17/06); INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL (treating metal surfaces or coating of metals by electrolysis or electrophoresis C 25 D, C 25 F) [2]

C 23 F

NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACES (working of metal by electro-erosion B 23 H; desurfacing by applying flames B 23 K 7/00; working metal by laser beam B 23 K 26/00; producing decorative effects by removing surface-material, e.g. by engraving, by etching, B 44 C 1/22; electrolytic etching or polishing C 25 F); 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 C 23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C 21 D OR C 22 F OR CLASS C 25 (inhibition or prevention of corrosion or incrustation during processing of hydrocarbons C 10 G 7/10, C 10 G 9/16, C 10 G 75/00) [4]

Notes

(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:

–

protective layers or coating compositions or methods of applying them; these are classified in the appropriate places, e.g. B 05, B 44, C 09 D, C 10 M, C 23 C;

–

mechanical devices or constructional features of particular articles for inhibiting incrustation; these are classified in the appropriate places, e.g. in pipes or pipe fittings F 16 L 58/00;

–

articles characterised by being made of materials selected for their properties of resistance to corrosion or incrustation; these are classified in the appropriate places, e.g. turbine blades F 01 D 5/28.

(3)

Processes using enzymes or micro-organisms in order to:

(i)

liberate, separate or purify a pre-existing compound or composition, or to

(ii)

treat textiles or clean solid surfaces of materials

are further classified in subclass C 12 S. [5]

1/

00

Etching metallic material by chemical means (manufacture of printing surfaces B 41 C; manufacture of printed circuits H 05 K) [2]
 

1/

02

. 

Local etching

1/

04

. . 

Chemical milling

1/

06

. 

Sharpening files

1/

08

. 

Apparatus, e.g. for photomechanical printing surfaces (photomechanical reproduction G 03 F)

1/

10

. 

Etching compositions (C 23 F 1/44 takes precedence) [4]

1/

12

. . 

Gaseous compositions [4]

1/

14

. . 

Aqueous compositions [4]

1/

16

. . . 

Acidic compositions (C 23 F 1/42 takes precedence) [4]

1/

18

. . . . 

for etching copper or alloys thereof [4]

1/

20

. . . . 

for etching aluminium or alloys thereof [4]

1/

22

. . . . 

for etching magnesium or alloys thereof [4]

1/

24

. . . . 

for etching silicon or germanium [4]

1/

26

. . . . 

for etching refractory metals [4]

1/

28

. . . . 

for etching iron group metals [4]

1/

30

. . . . 

for etching other metallic material [4]

1/

32

. . . 

Alkaline compositions (C 23 F 1/42 takes precedence) [4]

1/

34

. . . . 

for etching copper or alloys thereof [4]

1/

36

. . . . 

for etching aluminium or alloys thereof [4]

1/

38

. . . . 

for etching refractory metals [4]

1/

40

. . . . 

for etching other metallic material [4]

1/

42

. . . 

containing a dispersed water-immiscible liquid [4]

1/

44

. 

Compositions for etching metallic material from a metallic material substrate of different composition [4]

1/

46

. 

Regeneration of etching compositions [4]

3/

00

Brightening metals by chemical means [2]

3/

02

. 

Light metals

3/

03

. . 

with acidic solutions [4]

3/

04

. 

Heavy metals

3/

06

. . 

with acidic solutions [4]

4/

00

Processes for removing metallic material from surfaces, not provided for in group C 23 F 1/00 or C 23 F 3/00 [4]

4/

02

. 

by evaporation [4]

4/

04

. 

by physical dissolution [4]

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 oils, fuels or lubricants C 10; adding inhibitors to pickling solutions C 23 G)

11/

02

. 

in air or gases by adding vapour phase inhibitors

11/

04

. 

in markedly acid liquids

11/

06

. 

in markedly alkaline liquids

11/

08

. 

in other liquids

11/

10

. . 

using organic inhibitors

Note

In groups C 23 F 11/12 to C 23 F 11/18, in the absence of an indication to the contrary, a compound is classified in the last appropriate place.

11/

12

. . . 

Oxygen-containing compounds

11/

14

. . . 

Nitrogen-containing compounds

11/

16

. . . 

Sulfur-containing compounds

11/

167

. . . 

Phosphorus-containing compounds [4]

11/

173

. . . 

Macromolecular compounds [4]

11/

18

. . 

using inorganic inhibitors

13/

00

Inhibiting corrosion of metals by anodic or cathodic protection

13/

02

. 

cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions [5]

13/

04

. . 

Controlling or regulating desired parameters [5]

13/

06

. . 

Constructional parts, or assemblies of cathodic-protection apparatus [5]

13/

08

. . . 

Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto [5]

13/

10

. . . . 

Electrodes characterised by the structure (C 23 F 13/16 takes precedence) [5]

13/

12

. . . . 

Electrodes characterised by the material (C 23 F 13/16 takes precedence) [5]

13/

14

. . . . . 

Material for sacrificial anodes [5]

13/

16

. . . . 

Electrodes characterised by the combination of the structure and the material [5]

13/

18

. . . . 

Means for supporting electrodes [5]

13/

20

. . . . 

Conducting electric current to electrodes [5]

13/

22

. . . . 

Monitoring arrangements therefor [5]

14/

00

Inhibiting incrustation in apparatus for heating liquids for physical or chemical purposes (adding scale preventives or removers to water C 02 F 5/00) [2]

14/

02

. 

by chemical means

15/

00

Other methods of preventing corrosion or incrustation

17/

00

Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C 23 and at least one process covered by subclass C 21 D or C 22 F or class C 25 (C 23 C 28/00 takes precedence) [4]
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