... metals, especially copper and steel, with aluminum as a sacrificial anode Chemistry, Electrochemistry, and Electrochemical Applications | Aluminum For cathodic protection applications, it is important ... below À 1.8 V At higher potentials, aluminum dissolves in both acids and Chemistry, Electrochemistry, and Electrochemical Applications | Aluminum Al3+ zone (Acidic corrosion) 0.8 Al2O3 3H2O ... metals and alloys: 3MO þ 2Al-Al2 O3 þ 3M ½IV Aluminum and its alloys are stable in many molten salts Some aluminum alloys can be heat-treated by immersion Chemistry, Electrochemistry, and Electrochemical...