Impregnation or diffusion by heating the product to be coated with the required coating metal in powder form for example sherardising (cementation with zinc), calorising (cementation with aluminium) and chromising (with diffusion of chromium)
spraying atomising the molten coating metal and directing the spray onto the product to be coatedmetallisation by evaporating the coating metal in a vacuummetallisation by bombarding the coating metal with ions in a glow discharge (ion plating)coating by cathode vaporisation (sputtering)
Coating methods include:enamelling,varnishing,lacquering,painting surface printingcoating with ceramics or plastics, including special processes such as glow discharge, electrophoresis, electrostatic projection and immersion in an electrostatic fluidised bath followed by radiation firing
Subsequent finishing Finished products may be subjected to further finishing treatments such as mechanical workings (including turning, milling, grinding, perforation or punching) or surface treatments such as polishing, burnishing, artificial oxidation or chemical surface treatment. As a general rule such processes do not affect the heading under which the goods are classified.
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