The corrosion behavior of three Fe-15Cr-xAl alloys (x=0, 5, 10 at.%) beneath KCl-ZnCl2 deposits in air was investigated at 773K. All the alloys suffered from accelerated corrosion characterized by the formation of non-protective porous oxide scales. The addition of aluminum was only slightly beneficial for the corrosion resistance of the base alloy. The effect of aluminum is attributed to the increase of the Al2O3 content in the inner region of the scale, which may act as a barrier by retarding the rapid migration of the reactants.
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