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The present study investigates the influence of HO and KCl on the high-temperature corrosion of the FeCrAl alloy Kanthal AF. Polished samples, with and without applied KCl, were exposed isothermally to O or O + HO at 600 °C. The samples were investigated using TGA, XRD, SEM/EDX, AES and IC. It was found that KCl accelerates corrosion and that a rapidly growing iron, chromium-rich oxide forms in both environments. Chromate formation and alloy chlorination are shown to initiate the formation of non-protective oxide scales. In addition, aluminium nitrides form in the alloy substrate in both environments. [ABSTRACT FROM AUTHOR]