Corrosion resistance of molten-carbonate fuel cells (MCFC) is studied. The dissolution behavior of the oxides of nickel and copper have been investigated in detail, using a potential-sweep method and several conventional analytical techniques. In addition, studies of the direct electrochemical reduction of metal oxides on the cathode are discussed. Nickel is a major component of MCFC anode material, and nickel oxide is used as a cathode material. On account of its favorable economics, copper is also considered to be a suitable anode material.