Abstract
The effects of purity and impurities on the corrosion behavior of pure iron in sodium at high temperatures were investigated. High-purity iron and commercial-grade iron test pieces were immersed in sodium containing 4.6 ppm of oxygen and subjected to corrosion testing at 873 K for 4000 h. Mass changes were subsequently measured, and the surface corrosion behavior was observed using optical and polarization microscopes, as well as FE-SEM and TOF-SIMS. The results show that the vicinity of the grain boundary in the commercial grade iron was markedly corroded, whereas the grain boundaries of the high-purity iron remained sound. In addition to penetration of sodium, concentrations of aluminum and silicon were also identified at the grain boundaries of the commercial grade iron, indicating that these impurities reacted with sodium, thereby reducing the corrosion resistance of the grain boundaries.
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