Abstract
The hot corrosion behavior of 304 stainless steel (304SS) and the enamel coating in KCl–ZnCl2 salts is studied. The corrosion kinetics of the samples shows that the mass loss of enamel coating is far lower than that of 304SS, indicating that the enamel coating can effectively block the diffusion of Cl element to the enamel coating/alloy interface due to its high chemical stability in chloride salts and low grain boundary density. Fe2O3 and (Fe,Cr)2O3 are mainly formed on the surface of 304SS covered by KCl–10%ZnCl2, whereas no corrosion products are found on the surface of the enamel coating. When the content of ZnCl2 is increased to 55%, Fe2O3 and Cr2O3 are mainly formed on the surface of 304SS, and Zn2SiO4 is formed on the surface of the enamel coating. In the two salts, the corrosion layer of 304SS is composed of Fe-rich oxides (external) and Cr rich oxides (internal). The enrichment of high amounts of Cl element near the interface between the corrosion products and alloy matrix indicate that metal chlorides are formed at the interface. These results are in line with the characteristics of “active oxidation” mechanism.
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