Study on Composition Design of Enamel Coating and Its Resistance to Active Metal Vapor Corrosion

Abstract

After evaporation of cerium metal (simulated radioactive substance) in a stainless steel plate in a production process, Ce and Fe elements are interdiffused at the bonding interface and Ce-Fe solid solution is formed. There are problems such as incomplete recovery of attached materials and increased surface roughness at the interface, which cannot be reused. In order to reduce radioactive iste generation, metallic enamel coating is prepared on stainless steel substrate with SiO2, Al2O3, Na2O, K2O, CaF2 and CoO and its resistance to active metal vapor corrosion at high temperature is studied. The results show that the enamel coating is closely bonded to the substrate, forming a chemical bond of Fe-Co rich phase. The enamel coating can stably form a film with cerium metal atoms, and the evaporation coating does not fall off. The microstructure results show that cerium oxide is formed at the bonding interface between the enamel coating and cerium metal, forming a stable chemical bond. Compared with stainless steel substrate, there is no interfacial corrosion caused by mutual diffusion between enamel coating and cerium metal at the bonding interface, so it can only desorb cerium metal without damaging the coating and realize multiple reuse.