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A
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HUMAN NECESSITIES
B
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PERFORMING OPERATIONSTRANSPORTING
C
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CHEMISTRYMETALLURGY
C01
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CHEMISTRY
C01
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INORGANIC CHEMISTRY
C02
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TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
C03
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GLASSMINERAL OR SLAG WOOL
C04
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CEMENTSCONCRETEARTIFICIAL STONECERAMICSREFRACTORIES [4]
C05
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FERTILISERSMANUFACTURE THEREOF [4]
C06
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EXPLOSIVESMATCHES
C07
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ORGANIC CHEMISTRY [2]
C08
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ORGANIC MACROMOLECULAR COMPOUNDSTHEIR PREPARATION OR CHEMICAL WORKING-UPCOMPOSITIONS BASED THEREON
C09
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DYESPAINTSPOLISHESNATURAL RESINSADHESIVESCOMPOSITIONS NOT OTHERWISE PROVIDED FORAPPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
C10
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PETROLEUM, GAS OR COKE INDUSTRIESTECHNICAL GASES CONTAINING CARBON MONOXIDEFUELSLUBRICANTSPEAT
C11
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ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXESFATTY ACIDS THEREFROMDETERGENTSCANDLES
C12
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BIOCHEMISTRYBEERSPIRITSWINEVINEGARMICROBIOLOGYENZYMOLOGYMUTATION OR GENETIC ENGINEERING
C13
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SUGAR INDUSTRY [4]
C14
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SKINSHIDESPELTS OR LEATHER
C21
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METALLURGY
C21
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METALLURGY OF IRON
C22
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METALLURGYFERROUS OR NON-FERROUS ALLOYSTREATMENT OF ALLOYS OR NON-FERROUS METALS
C23
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COATING METALLIC MATERIALCOATING MATERIAL WITH METALLIC MATERIALCHEMICAL SURFACE TREATMENTDIFFUSION TREATMENT OF METALLIC MATERIALCOATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERALINHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL [2]
C23C
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COATING METALLIC MATERIALCOATING MATERIAL WITH METALLIC MATERIALSURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTIONCOATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C 23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D 39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B 41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M 11/83; decorating textiles by locally metallising D06Q 1/04) [4]
C23C 2/00
Coating by applying the coating material in the molten state [4]
C23C 2/00
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Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shapeApparatus therefor [4, 2006.01]
C23C 4/00
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Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge (build-up welding B23K, e.g. B23K 5/18, B23K 9/04) [4, 2006.01, 2016.01]
C23C 6/00
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Coating by casting molten material on the substrate [4, 2006.01]
C23C 8/00
Solid state diffusion into metallic material surfaces [4]
C23C 8/00
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Solid state diffusion of only non-metal elements into metallic material surfaces (diffusion of silicon C23C 10/00)Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals (C23C 14/00 takes precedence) [4, 2006.01]
C23C 10/00
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Solid state diffusion of only metal elements or silicon into metallic material surfaces [4, 2006.01]
C23C 12/00
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Solid state diffusion of at least one non-metal element other than silicon and at least one metal element or silicon into metallic material surfaces [4, 2006.01]
C23C 14/00
Coating by vacuum evaporation, by sputtering or by ion implantation [4]
C23C 14/00
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Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material [4, 2006.01]
C23C 16/00
Chemical deposition or plating by decompositionContact plating [4]
C23C 16/00
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Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes (reactive sputtering or vacuum evaporation C23C 14/00) [4, 2006.01]
C23C 18/00
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Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coatingContact plating [4, 2006.01]
C23C 20/00
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Chemical coating by decomposition of either solid compounds or suspensions of the coating forming compounds, without leaving reaction products of surface material in the coating [4, 2006.01]
C23C 22/00

C23C 22/00
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Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals [4, 2006.01]
C23C 22/02
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using non-aqueous solutions [4, 2006.01]
C23C 22/03
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. . containing phosphorus compounds [4, 2006.01]
C23C 22/04
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. . containing hexavalent chromium compounds [4, 2006.01]
C23C 22/05
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using aqueous solutions [5, 2006.01]
C23C 22/06
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. . using aqueous acidic solutions with pH < 6 [4, 5, 2006.01]
C23C 22/07
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. . . containing phosphates [4, 5, 2006.01]
C23C 22/08
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. . . . Orthophosphates [4, 5, 2006.01]
C23C 22/10
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. . . . . containing oxidants [4, 5, 2006.01]
C23C 22/12
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. . . . . containing zinc cations [4, 5, 2006.01]
C23C 22/13
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. . . . . . containing also nitrate or nitrite anions [4, 5, 2006.01]
C23C 22/14
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. . . . . . containing also chlorate anions [4, 5, 2006.01]
C23C 22/16
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. . . . . . containing also peroxy-compounds [4, 5, 2006.01]
C23C 22/17
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. . . . . . containing also organic acids [4, 5, 2006.01]
C23C 22/18
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. . . . . containing manganese cations [4, 5, 2006.01]
C23C 22/20
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. . . . . containing aluminium cations [4, 5, 2006.01]
C23C 22/22
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. . . . . containing alkaline earth metal cations [4, 5, 2006.01]
C23C 22/23
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. . . . Condensed phosphates [4, 5, 2006.01]
C23C 22/24
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. . . containing hexavalent chromium compounds [4, 5, 2006.01]
C23C 22/26
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. . . . containing also organic compounds [4, 5, 2006.01]
C23C 22/27
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. . . . . Acids [4, 5, 2006.01]
C23C 22/28
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. . . . . Macromolecular compounds [4, 5, 2006.01]
C23C 22/30
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. . . . containing also trivalent chromium [4, 5, 2006.01]
C23C 22/32
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. . . . containing also pulverulent metals [4, 5, 2006.01]
C23C 22/33
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. . . . containing also phosphates [4, 5, 2006.01]
C23C 22/34
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. . . containing fluorides or complex fluorides [4, 5, 2006.01]
C23C 22/36
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. . . . containing also phosphates [4, 5, 2006.01]
C23C 22/37
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. . . . containing also hexavalent chromium compounds [4, 5, 2006.01]
C23C 22/38
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. . . . . containing also phosphates [4, 5, 2006.01]
C23C 22/40
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. . . containing molybdates, tungstates or vanadates [4, 5, 2006.01]
C23C 22/42
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. . . . containing also phosphates [4, 5, 2006.01]
C23C 22/43
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. . . . containing also hexavalent chromium compounds [4, 5, 2006.01]
C23C 22/44
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. . . . containing also fluorides or complex fluorides [4, 5, 2006.01]
C23C 22/46
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. . . containing oxalates [4, 5, 2006.01]
C23C 22/47
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. . . . containing also phosphates [4, 5, 2006.01]
C23C 22/48
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. . . not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates [4, 5, 2006.01]
C23C 22/50
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. . . . Treatment of iron or alloys based thereon [4, 5, 2006.01]
C23C 22/52
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. . . . Treatment of copper or alloys based thereon [4, 5, 2006.01]
C23C 22/53
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. . . . Treatment of zinc or alloys based thereon [4, 5, 2006.01]
C23C 22/54
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. . . . Treatment of refractory metals or alloys based thereon [4, 5, 2006.01]
C23C 22/56
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. . . . Treatment of aluminium or alloys based thereon [4, 5, 2006.01]
C23C 22/57
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. . . . Treatment of magnesium or alloys based thereon [4, 5, 2006.01]
C23C 22/58
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. . . . Treatment of other metallic material [4, 5, 2006.01]
C23C 22/60
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. . using alkaline aqueous solutions with pH > 8 [4, 5, 2006.01]
C23C 22/62
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. . . Treatment of iron or alloys based thereon [4, 5, 2006.01]
C23C 22/63
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. . . Treatment of copper or alloys based thereon [4, 5, 2006.01]
C23C 22/64
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. . . Treatment of refractory metals or alloys based thereon [4, 5, 2006.01]
C23C 22/66
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. . . Treatment of aluminium or alloys based thereon [4, 5, 2006.01]
C23C 22/67
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. . . . with solutions containing hexavalent chromium [4, 5, 2006.01]
C23C 22/68
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. . using aqueous solutions with pH between 6 and 8 [4, 5, 2006.01]
C23C 22/70
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using melts [4, 2006.01]
C23C 22/72
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. . Treatment of iron or alloys based thereon [4, 2006.01]
C23C 22/73
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characterised by the process [4, 2006.01]
C23C 22/74
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. . for obtaining burned-in conversion coatings [4, 2006.01]
C23C 22/76
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. . Applying the liquid by spraying [4, 2006.01]
C23C 22/77
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. . Controlling or regulating of the coating process [4, 2006.01]
C23C 22/78
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Pretreatment of the material to be coated [4, 2006.01]
C23C 22/80
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. . with solutions containing titanium or zirconium compounds [4, 2006.01]
C23C 22/82
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After-treatment [4, 2006.01]
C23C 22/83
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. . Chemical after-treatment [4, 2006.01]
C23C 22/84
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. . Dyeing [4, 2006.01]
C23C 22/86
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Regeneration of coating baths [4, 2006.01]
C23C 24/00
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Coating starting from inorganic powder (spraying of the coating material in molten state C23C 4/00; solid state diffusion C23C 8/00-C23C 12/00) [4, 2006.01]
C23C 26/00
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Coating not provided for in groups C23C 2/00-C23C 24/00 [4, 2006.01]
C23C 28/00
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Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups C23C 2/00-C23C 26/00, or by combinations of methods provided for in subclasses C23C and C25D [4, 2006.01]
C23C 30/00
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Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process (C23C 26/00, C23C 28/00 take precedence) [4, 2006.01]
C23D
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ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
C23F
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NON-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)INHIBITING CORROSION OF METALLIC MATERIALINHIBITING INCRUSTATION IN GENERAL (treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D, C25F)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]
C23G
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CLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
C25
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ELECTROLYTIC OR ELECTROPHORETIC PROCESSESAPPARATUS THEREFOR [4]
C30
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CRYSTAL GROWTH [3]
C40
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COMBINATORIAL TECHNOLOGY [2006.01]
C40
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COMBINATORIAL TECHNOLOGY [2006.01]
C99
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SUBJECT MATTER NOT OTHERWISE PROVIDED FOR IN THIS SECTION [2006.01]
D
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TEXTILESPAPER
E
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FIXED CONSTRUCTIONS
F
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MECHANICAL ENGINEERINGLIGHTINGHEATINGWEAPONSBLASTING
G
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PHYSICS
H
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ELECTRICITY

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