Abstract
ABSTRACTNaCl-52 wt-%MgCl2 is a good thermal storage medium at medium–high temperature. But the corrosion of chlorate on metal is serious and the mechanism is unclear. In this paper, the corrosion kinetics curves of Fe and three kinds of Fe-based superalloys were measured by the immersion salt corrosion method at 520°C. The microstructure and composition on the surface and cross-section were characterised by a scanning electron microscopy with EDS analysis and X-ray diffraction. The results show that corrosion kinetics curves obey linear law, and the average mass loss rate of Fe is the lowest of all. After corrosion for 20 h, the main composition on Fe surface was mainly magnesia (MgO) and Fe. Shell structure appeared on the surface of three alloys, the composition of shell was MgO, while matrix had Fe, Ni and its compounds. After corrosion for 160 h, the surfaces of four samples became loose, and they generated different corrosion products. The cross-sectional morphology and line scanning analysis results show that Fe corrosion is relatively mild, while Fe-based alloys presented obvious corrosion layer, and the content of Fe and Cr near corrosion layer decreased. The corrosion mechanism of Fe-based superalloys mainly involves oxidation–chlorination.
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