Corrosion of the wet-seal area in molten carbonate fuel cells. I: Analysis

Severe corrosion can occur in the seal area between the cell housing and the electrolyte tile of a molten carbonate fuel cell even if an optimal selection of the active cell materials has been made. Thermodynamic calculations and an approx. mixed-potential analysis indicate that several minor corrosion cells are active at open circuit and a major corrosion cell is established when the cell is under load. Extensive corrosion can be expected on the anode side of the wet seal, although effects at the cathode side are minor. Materials tested include Cu, Ni, Fe, Co, Cr, Nb, Ta, etc. 22 ref.--AA