Surface finishing is a broad range of industrial processes that alter the surface of a manufactured item for achieve a certain property. Finishing processes may be employed to: improve appearance, adhesion or wettability, solderability, corrosion resistance, tarnish resistance, chemical resistance, wear resistance, hardness, modify electrical conductivity, remove burrs and other surface flaws, and control the surface friction. In limited cases some of these techniques can be used to restore original dimensions to salvage or repair an item.
Surface finishing processes can be categorized by how they affect the workpiece:
Adding or altering finishing: such as Galvanizing, Anodizing, Power Coating, Mechanical Plating;
Removing or reshaping finishing: such as sandblasting, burnishing, shot-peening,
Mechanical processes may also be categorized together because of similarities of the final surface finish.