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CORROSION Corrosion is a galvanic process by which metals deteriorate through oxidation usually but not always to their oxides. For example when exposed to air, iron (Fe)is rusts, Silver (Ag) tarnishes , and Copper (Cu) and brass acquire a bluish green surface called a patina. Of the various metals subject to corrosion, Iron is by fast the most important commercially. RUSTING OF IRON TARNISHING IN COPPER TARNISHING IN SILVER Corrosion is a redox process. The oxidation of most of metals is thermodynamically spontaneous with the notable exception of gold and platinum. RUSTING OF IRON Rust is a combination of several different oxides of iron . Rust is an iron ox...