The influence of Y and Nb addition on the corrosion resistance of Fe-Cr-Al-Ni model alloys exposed to oxygen-containing molten Pb

Abstract

Abstract The corrosion behaviour of four different alumina-forming austenitic model alloys (Fe-Cr-Al-Ni based) in oxygen-containing molten Pb at 600 and 650\u2009°C has been investigated. A thin protective oxide layer is formed on all alloys after 2000\u2009h at 600\u2009°C, whereas increasing the temperature to 650\u2009°C accelerates the oxidation and promotes dissolution attack. Only one composition with minor additions of Y and Nb and low Ni concentration shows corrosion resistance at 650\u2009°C. Y and Nb have significant positive influence on the corrosion resistance and the phase composition of the alloys.