Acknowledgment

potential. Nickel ion may migrate hrough the oxide layer from the metal surface toward the electrode/electrolyte in-terface, and is deposited as fluoride in a well-dehydrated melt. The concentration ratio NiF = to NiO = on the outer surface of oxide layer is large in comparison with that on the inside. The oxide layer deposited in molten CsF. NH~F 9 4HF containing water is less electrically conductive than that in a well-dehydrated melt mainly because of the for-mation of the thicker oxide layer on the nickel anode9 The current loss caused by dissolution of the nickel an-ode is approximately I ~ 5 % of the total depending on the potential. The corrosion rate is increased with increasing polarization potential, but the current loss decreases with increasing potential since the gas evolution is stimulated