Corrosion behavior of dispersion-strengthened ferritic Fe-13Cr-2Mo steel in lead melt
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The corrosion behavior of dispersion-strengthened ferritic Fe-13Cr-2Mo (TiO2) steel in oxygen-containing lead melt is investigated at 550 and 650°C. It is determined that duplex magnetite scale is formed on the steel surface at 550°C and oxygen concentration of about 10−3 wt.% in the lead melt. The scale grows symmetrically with regard to the initial steel-melt interface toward the liquid metal and matrix. The outer oxide layer consists of Fe3O4, the upper part of which contains plumboferrites, while the inner oxide is Cr-rich spinel Fe1+xCr2−xO4. As the scale grows, the imperfection of the duplex oxide increases. The oxidation intensifies as interaction temperature increases to 650°C. The scale loses its protective properties and becomes penetrable for lead. With decreasing oxygen concentration in the lead melt (10−5 wt.%), the scale growth becomes slower while the corrosion resistance of steel increases.
KeywordsFe-13Cr-2Mo (TiO2) steel lead melt oxidation
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