NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACES; 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 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS OR OR CLASS

Introduced: September 1968

Last revised: January 1985

Classification Context

Section:: CHEMISTRY; METALLURGY
Class:: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
Subclass:: NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACES; 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 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS OR OR CLASS

Description

C23F covers chemical and electrochemical methods for removing metallic material from surfaces without mechanical action, such as pickling, etching, and electropolishing processes. The subclass also encompasses corrosion inhibition techniques using chemical treatments, coatings, or inhibitor compounds, and methods for preventing incrustation (scale formation) on metallic and non-metallic surfaces. Additionally, C23F includes multi-step surface treatment processes that combine techniques from class C23 with those from adjacent subclasses or classes, such as combining chemical cleaning with subsequent coating or diffusion treatments. This classification excludes purely mechanical removal methods, which fall under different technical fields.

Scope Notes

Glossary: alloys alloy include: metallic composite materials containing a substantial proportion of fibres or other somewhat larger particles; ceramic compositions bonded by free metal, containing free metal bonded to carbides, diamond, oxides, borides, nitrides or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides or sulfides, other than as macroscopic reinforcing agents. applying corrosion inhibitors applying corrosion inhibitor applying corrosion inhibitors to a metallic surface layer is not considered to be applying a protective coating corrosion deterioration of a metallic material due to a change of valence state caused by reactions with its environment | Limiting references: Working of metal by electro-erosion De-surfacing by applying flames Working metal by laser beam Adding scale preventives or removers to water Electrolytic etching or polishing | Application references: Preventing formation of scale in cooking vessels Producing decorative effects by removing surface-material, e.g. by engraving or by etching Mechanical methods for preventing fouling in hull protection Preventing incrustations during destructive distillation of carbonaceous materials Inhibition or prevention of corrosion or incrustation during processing of hydrocarbons , , Use of additives to fuels or fires for minimising corrosion or incrustation Adding corrosion inhibitors to lubricants , Adding corrosion inhibitors to pickling solutions Preventing incrustation in pipes

Related Keywords

ANTI-CORROSION compositionsANTI-CORROSION in generalANTI-FOULING compositions for preventing incrustationBRIGHTENING of metals chemicallyPREVENTING scale or incrustationPREVENTING scale or incrustation by adding agents to water

8 direct subcodes

Child Classifications

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C23F 1/00 Etching metallic material by chemical means
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
C23F 13/00 Inhibiting corrosion of metals by anodic or cathodic protection
C23F 14/00 Inhibiting incrustation in apparatus for heating liquids for physical or chemical purposes
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 and at least one process covered by subclass or or class
C23F 3/00 Brightening metals by chemical means
C23F 4/00 Processes for removing metallic material from surfaces, not provided for in group or