IPC 7 English version
C23F-C23F01700

SECTION C – CHEMISTRY; METALLURGY


C 23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL (by metallising textiles D06M 11/83; decorating textiles by locally 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]


C 23 FNON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACES (working of metal by electro-erosion B23H; desurfacing by applying flames B23K 7/00; working metal by laser beam B23K 26/00; 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 (inhibition or prevention of corrosion or incrustation during processing of hydrocarbons C10G 7/10, C10G 9/16, C10G 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. B05, B44, C09D, C10M, C23C;

 –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 F16L 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 F01D 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 C12S.  [5]


Subclass Index

ETCHING, BRIGHTENING, COMPOSITIONS THEREFOR 

C23F 1/00, C23F 3/00 

OTHER REMOVING OF METALLIC MATERIAL 

C23F 4/00 

INHIBITING CORROSION OR INCRUSTATION 

C23F 11/00 to C23F 15/00 

MULTI-STEP SURFACE TREATMENTS 

C23F 17/00 


1/

00Etching metallic material by chemical means (manufacture of printing surfaces B41C; manufacture of printed circuits H05K) [2]

1/

02.Local etching

1/

04..Chemical milling

1/

06.Sharpening files

1/

08.Apparatus, e.g. for photomechanical printing surfaces (photomechanical reproduction G03F)

1/

10.Etching compositions (C23F 1/44 takes precedence)  [4]

1/

12..Gaseous compositions  [4]

1/

14..Aqueous compositions  [4]

1/

16...Acidic compositions (C23F 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 (C23F 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/

00Brightening 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/

00Processes for removing metallic material from surfaces, not provided for in group C23F 1/00 or C23F 3/00  [4]

4/

02.by evaporation  [4]

4/

04.by physical dissolution  [4]


11/

00Inhibiting 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 C10; adding inhibitors to pickling solutions C23G)

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 C23F 11/12 to C23F 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/

00Inhibiting 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 (C23F 13/16 takes precedence)  [5]

13/

12....Electrodes characterised by the material (C23F 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/

00Inhibiting incrustation in apparatus for heating liquids for physical or chemical purposes (adding scale preventives or removers to water C02F 5/00) [2]

14/

02.by chemical means


15/

00Other methods of preventing corrosion or incrustation


17/

00Multi-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) [4]