C23F

NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE working metal by laser beams B23K26/00; desurfacing by applying flames B23K7/00; working of metal by electro-erosion B23H; producing decorative effects by removing surface material, e.g. by engraving, by etching, B44C1/22; electrolytic etching or polishing C25F

INHIBITING CORROSION OF METALLIC MATERIAL OR 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

protective layers or coating compositions or methods of applying them; these are classified in the appropriate places, e.g. B05, B44, C09D, 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 F16L58/00.

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 F01D5/28.

The following IPC group is not in the CPC scheme. The subject matter for this IPC group is classified in the following CPC groups:

C23F1/24

covered by C09K13/00, H01L21/00

In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.

C23F1/00

Etching metallic material by chemical means manufacture of printing surfaces B41C; manufacture of printed circuits H05K

C23F1/02

Local etching

C23F1/04

Chemical milling

C23F1/06

Sharpening files

C23F1/08

Apparatus, e.g. for photomechanical printing surfaces photo- mechanical reproduction G03F

C23F1/10

Etching compositions C23F1/44 takes precedence

C23F1/12

Gaseous compositions

C23F1/14

Aqueous compositions

C23F1/16

Acidic compositions C23F1/42 takes precedence

C23F1/18

for etching copper or alloys thereof

C23F1/20

for etching aluminium or alloys thereof

C23F1/22

for etching magnesium or alloys thereof

C23F1/26

for etching refractory metals

C23F1/28

for etching iron group metals

C23F1/30

for etching other metallic material

C23F1/32

Alkaline compositions C23F1/42 takes precedence

C23F1/34

for etching copper or alloys thereof

C23F1/36

for etching aluminium or alloys thereof

C23F1/38

for etching refractory metals

C23F1/40

for etching other metallic material

C23F1/42

containing a dispersed water-immiscible liquid

C23F1/44

Compositions for etching metallic material from a metallic material substrate of different composition

C23F1/46

Regeneration of etching compositions

C23F3/00

Brightening metals by chemical means

C23F3/02

Light metals

C23F3/03

with acidic solutions

C23F3/04

Heavy metals

C23F3/06

with acidic solutions

C23F4/00

Processes for removing metallic material from surfaces, not provided for in group C23F1/00 or C23F3/00

C23F4/02

by evaporation

C23F4/04

by physical dissolution

C23F11/00

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

C23F11/02

in air or gases by adding vapour phase inhibitors

C23F11/04

in markedly acid liquids

C23F11/06

in markedly alkaline liquids

C23F11/08

in other liquids

C23F11/10

using organic inhibitors

A compound is classified in the last appropriate place.

Esters or anhydrides of organic acids are classified as the relevant acid unless otherwise indicated. Salts of a compound with an inorganic compound are classified as that compound unless specifically provided for.

C23F11/12

Oxygen-containing compounds

C23F11/122

Alcohols; Aldehydes; Ketones

C23F11/124

Carboxylic acids

C23F11/126

Aliphatic acids

C23F11/128

Esters of carboxylic acids

C23F11/14

Nitrogen-containing compounds

C23F11/141

Amines; Quaternary ammonium compounds

C23F11/142

Hydroxy amines

C23F11/143

Salts of amines

C23F11/144

Aminocarboxylic acids

C23F11/145

Amides; N-substituted amides

C23F11/146

containing a multiple nitrogen-to-carbon bond

C23F11/147

containing a nitrogen-to-oxygen bond

C23F11/148

containing a nitrogen-to-nitrogen bond

C23F11/149

Heterocyclic compounds containing nitrogen as hetero atom

C23F11/16

Sulfur-containing compounds

C23F11/161

Mercaptans

C23F11/162

Thioaldehydes; Thioketones

C23F11/163

Sulfonic acids

C23F11/164

containing a -SO₂-N group

C23F11/165

Heterocyclic compounds containing sulfur as hetero atom

C23F11/167

Phosphorus-containing compounds

C23F11/1673

Esters of phosphoric or thiophosphoric acids

C23F11/1676

Phosphonic acids

C23F11/173

Macromolecular compounds

C23F11/18

using inorganic inhibitors

C23F11/181

Nitrogen containing compounds

C23F11/182

Sulfur, boron or silicon containing compounds

C23F11/184

Phosphorous, arsenic, antimony or bismuth containing compounds

C23F11/185

Refractory metal-containing compounds

C23F11/187

Mixtures of inorganic inhibitors

C23F11/188

containing phosphates

C23F13/00

Inhibiting corrosion of metals by anodic or cathodic protection

C23F13/005

Anodic protection

C23F13/02

cathodic

Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions

C23F13/04

Controlling or regulating desired parameters

C23F13/06

Constructional parts, or assemblies of cathodic-protection apparatus

C23F13/08

Electrodes specially adapted for inhibiting corrosion by cathodic protection

Manufacture thereof

Conducting electric current thereto

C23F13/10

Electrodes characterised by the structure C23F13/16 takes precedence

C23F13/12

Electrodes characterised by the material C23F13/16 takes precedence

C23F13/14

Material for sacrificial anodes

C23F13/16

Electrodes characterised by the combination of the structure and the material

C23F13/18

Means for supporting electrodes

C23F13/20

Conducting electric current to electrodes

C23F13/22

Monitoring arrangements therefor

C23F14/00

Inhibiting incrustation in apparatus for heating liquids for physical or chemical purposes adding scale preventives or removers to water C02F5/00

; inhibiting incrustation in polymerisation reactors C23F15/005

C23F14/02

by chemical means

C23F15/00

Other methods of preventing corrosion or incrustation

C23F15/005

Inhibiting incrustation

C23F17/00

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 coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups C23C2/00 - C23C26/00, or by combinations of methods providedfor in subclasses C23C and C25D, C23C28/00

C23F2201/00

Type of materials to be protected by cathodic protection

C23F2201/02

Concrete, e.g. reinforced

C23F2213/00

Aspects of inhibiting corrosion of metals by anodic or cathodic protection

C23F2213/10

Controlling or regulating parameters

C23F2213/11

for structures subject to stray currents

C23F2213/20

Constructional parts or assemblies of the anodic or cathodic protection apparatus

C23F2213/21

combining at least two types of anodic or cathodic protection

C23F2213/22

characterized by the ionic conductor, e.g. humectant, hydratant or backfill

C23F2213/30

Anodic or cathodic protection specially adapted for a specific object

C23F2213/31

Immersed structures, e.g. submarine structures

C23F2213/32

Pipes