The oxidation behavior of Ni in molten carbonate was evaluated by chronopot
entiometry. The oxidation of Ni in molten carbonate proceeded in a two-step
reaction. The first step of oxidation was independent of the specimens' na
ture and depended on P-CO2. On the other hand, the second step of oxidation
depended on the batch of the specimens, and was independent of P-CO2. The
corrosion product in both oxidation processes was divalent Ni oxide, namely
NiO.