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. Impedance spectra characteristics of Fe-20Cr, Fe-20Cr-0.2Dy and Fe-20Cr-1Dy alloys are studied in 0.5K2SO4-0.5KCl mixture in air at 600°C. The two-electrode system is used for electrochemical impedance measurements, and it has been proved effective in the study of solidand molten-salt corrosion. The corrosion of alloys goes through two stages during extended exposure. Impedance spectra of every stage is fitted by an equivalent circuit and corresponding electrochemical elements. The effect of Cr content in Fe-based alloys has been investigated in an attempt to understand corrosion mechanism involving the active/oxidation process of metal Cr. The effect of the additive Dy dissolving and precipitating in Fe-Cr alloy on the hot corrosion has also been investigated. Corrosion products in different stages are analyzed by scanning electron microscopy and the formation and depletion of protective scale in mixed salt is monitored. Corrosion rate and corrosion mechanism of three alloys are discussed.

Impedance Spectra Characteristics of Dy-doped Fe-20Cr Alloys in the Presence of Solid K2SO4-KCl Mixture at 600°C in Air