|  | C |
SECTION C — CHEMISTRY AND METALLURGY

|  | C |
Note(s) Definitions for Section C: Alkali metals: Li, Na, K, Rb, Cs, Fr Alkaline earth metals: Ca, Sr, Ba, Ra Lanthanides: elements with atomic numbers 57 to 71 inclusive Rare earths: Sc, Y, Lanthanides Actinides: elements with atomic numbers 89 to 103 inclusive Refractory metals: Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W Halogens: F, Cl, Br, I, At Noble gases: He, Ne, Ar, Kr, Xe, Rn Platinum group: Os, Ir, Pt, Ru, Rh, Pd Noble metals: Ag, Au, Platinum group Light metals: alkali metals, alkaline earth metals, Be, Al, Mg Heavy metals: metals other than light metals Iron group: Fe, Co, Ni Non-metals: H, B, C, Si, N, P, O, S, Se, Te, noble gases, halogens Metals: elements other than non-metals Transition elements: elements with atomic numbers 21 to 30 inclusive, 39 to 48 inclusive, 57 to 80 inclusive, 89 upwards

METALLURGY

|  | C23 |
WORKING OR TREATMENT OF METALS, OTHER THAN BY MECHANICAL MEANS; COVERING MATERIALS WITH METALS (decorating textiles by metallising Fulltext... Hierarchy... Expanded...D06Q 1/04); INHIBITING CORROSION OR INCRUSTATION IN GENERAL (treating metal surfaces or coating of metals by electrolysis or electrophoresis Fulltext... Hierarchy... Expanded...C25D, Fulltext... Hierarchy... Expanded...C25F) [2]

|  | C23G |
CLEANING AND DE-GREASING OF METALLIC OBJECTS BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS (polishing compositions Fulltext... Hierarchy... Expanded...C09G; detergents in general Fulltext... Hierarchy... Expanded...C11D)

|  | C23G 1/00 |
Cleaning or pickling metals with solutions or molten salts (with organic solvents Fulltext... Hierarchy... Expanded...C23G 5/02)

|  | C23G 1/02 |
· | with acid solutions

|  | C23G 1/04 |
· · | using inhibitors

|  | C23G 1/06 |
· · · | organic inhibitors

|  | C23G 1/08 |
· · | iron or steel

|  | C23G 1/10 |
· · | other heavy metals

|  | C23G 1/12 |
· · | light metals

|  | C23G 1/14 |
· | with alkaline solutions

|  | C23G 1/16 |
· · | using inhibitors

|  | C23G 1/18 |
· · · | organic inhibitors

|  | C23G 1/20 |
· · | heavy metals

|  | C23G 1/22 |
· · | light metals

|  | C23G 1/24 |
· | with neutral solutions

|  | C23G 1/26 |
· · | using inhibitors

|  | C23G 1/28 |
· | with molten salts

|  | C23G 1/30 |
· · | using inhibitors

|  | C23G 1/32 |
· · | heavy metals

|  | C23G 1/34 |
· · | light metals

|  | C23G 1/36 |
· | Regeneration of waste pickling liquors

|  | C23G 3/00 |
Apparatus for cleaning or pickling metals (apparatus for continuously conveying articles into baths Fulltext... Hierarchy... Expanded...B65G)

|  | C23G 3/02 |
· | for cleaning wires, strips, filaments continuously

|  | C23G 3/04 |
· | for cleaning pipes

|  | C23G 5/00 |
Cleaning or de-greasing metals by other methods

|  | C23G 5/02 |
· | using organic solvents

|  | C23G 5/04 |
· · | Apparatus