Corrosion of Metal Oxide Ceramics in Molten Lithium‐Potassium Carbonates

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Abstract
A corrosion testing program was used to survey metal oxides potentially useful in a molten carbonate fuel cell environment. Tests included immersion of polycrystalline sintered pellets, powdered samples immersed in molten carbonate under 10 atm of simulated cathode gas, and immersion gravimetric tests using powder samples under 1 atm of simulated cathode gas. All tests were at 700°C using under static (no electrical potential) conditions. ,, , and were very corrosion resistant at both large and small carbonate to ceramic ratios and under 1 and 10 atm of cathode gas. dopants, dopants, , and were not stable at 1 atm pressure with large (150:1) carbonate to ceramic ratios, but were more stable at 10 atm pressure and lower carbonate to ceramic ratios (10:1, 1:1). These effects were explained using solubility and carbonate decomposition thermodynamics.

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