Abstract
The corrosion of Ni and FeAl in molten (0.62Li, 0.38K)2CO3 mixtures at 650°Cin air has been examined by the electrochemical-impedance spectroscopy (EIS)technique. The impedance spectra for Ni showed the typical characteristics ofa diffusion-controlled reaction, i.e., a semicircle at the high-frequency portand a line at the low-frequency port. The corrosion of FeAl also presentedthe feature of a diffusion-controlled reaction during initial immersion. However,the impedance spectra were composed of two capacitance loops after someimmersion time. The change of the impedance spectra with immersion time maybe ascribed to the formation of continuous external LiFeO2 and an innerAl2O3 layer. Equivalent circuits representing the featuresof the corrosion of Ni and FeAl were proposed to fit the impedance spectra andelectrochemical parameters in the equivalent circuits were also calculated. Basedon the measurement of diffusion impedance, the diffusion ofO−2 was proposed to be the predominant feature of oxygen reduction.
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