Coating Terms

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Removal of oils and oxide layers on a surface with acid solutions, either by saponification of oils to obtain water soluble soaps or by formation of water soluble salts from oxides. Chromic acid and phosphoric acid are especially prefered for surface cleaning because they form metal chromate or metal phosphate layers strongly adhering to the metal and behave as electrochemically inactive metals rather than dissolving the metal oxide layers like most of the other acids do.