The corrosion behavior of three Fe-15Cr-xAl(x=0, 5, 10%) alloys below KCl-ZnCl2 deposits in air was investigated at 600 ℃. Compared to their oxidation in air, all the alloys suffered from enhanced corrosion with the formation of non-protective porous scale, particularly in combination with internal attack of matrix. The corrosion rates decreased with increasing aluminum content. The effect of aluminum was mainly attributed to the enrichment of Al2O3 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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