Electropolishing (electrochemical polishing) is similar to electroplating, except that in electropolishing, metal is selectively removed rather than deposited. Under proper conditions, metal is removed uniformly, thus causing smoothening and/or brightening. In addition to smoothening and brightening operations, electropolishing is used for many other applications, including the reduction of friction, fatigue, and out-gassing.

Electropolishing provides superior results in antistick and release properties, wear and corrosion resistance, and passivity. It is also used as a means of inspecting metal surfaces and welds, and as a means of controlling size and/or weight. Electropolishing is applicable to a great variety of metals and alloys, the most popular being: aluminum and aluminum alloys, copper and copper alloys, iron, steel, and stainless steels. KEYWORDS for this definition: electropolishers