Corrosion behaviour of Fe–6·5 wt-%Si atomised powders

Abstract

This paper reports our investigation on the corrosion resistance and corrosion behaviour of Fe-6?5 wt-%Si atomised powders. Results showed that corrosion resistance was strongly related to powder sizes. When powder sizes were ,38 mm, they showed excellent corrosion resistance compared with the larger ones. Analysis suggested that most of the corrosion started from corrosion pits when the powder sizes were .53 mm. Weaker corrosion resistance can be explained by severe Si content heterogeneity and more grain boundaries in the larger sizes atomised powders.