43.3 COATINGS

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A coating can be applied to protect surfaces and/or improves appearances.

Processes include,

Chrome plating - a reaction with chromic acid leaves a chrome plating on a part

Phosphate plating - a reaction with phosphoric acid leaves a phosphoric coating on a part

Electroplating - thin metal coatings are made by dissolving an anode in an electrolytic solution with an electric current

Hot dip coating - parts are dipped in molten metal and get a new coating

Vacuum deposition (ion plating) - metals are vaporized in a vacuum chamber and these deposit in thin layers on a surface