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Electropolishing, also referred to as electrochemical polishing, is an electrochemical process which is used for smoothing and polishing of metal surfaces by removing a microscopic amount of material from the work piece. Typically, the metal work piece is immersed in a temperature controlled bath of electrolyte and connected to the positive terminal (anode) of a DC power supply, the negative terminal being attached to an auxiliary electrode (cathode). An ionic current passes from the anode where metal is oxidized to the cathode where a reduction reaction, normally hydrogen evolution, takes place. Electrolytes used for electropolishing are most often concentrated acid solutions having a high viscosity such as mixtures of sulfuric acid and phosphoric acid. Other electropolishing electrolytes reported in the literature include mixtures of perchlorates with acetic anhydride and methanolic solutions of sulfuric acid.
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|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Electropolishing". A list of authors is available in Wikipedia.|