Research progress of surface coatings on corrosion control of materials in sub/supercritical water environment
[Introduction]Subcritical/supercritical water oxidation technology is one of the effective methods to treat solid waste and refractory wastewater.However,the harsh reaction conditions lead to equipment corrosion problems,limiting the development of sub/supercritical water oxidation technology.How to improve the corrosion resistance of alloys in this environment has become the focus and difficulty of research,and coating technology is an effective means of retarding metal corrosion.[Method]The corrosion resistance mechanism of traditional alloy coatings,ceramic coatings,composite coatings,and high-entropy alloy(HEA)coatings in sub/supercritical water environment and the coating failure mechanisms were summarized.[Result]Traditional alloy coatings,ceramic coatings,and composite coatings are mainly used to isolate the corrosive media from reacting with the elements in substrate by forming a compact and continuous oxide layer on its surface.HEA coatings can improve the corrosion resistance of materials by forming a spinel structure and an oxide layer.[Conclusion]The main cause of the failure of anticorrosive coatings in sub/supercritical water environment is the destruction of the integrity of surficial oxide layer,while different types of coatings also have different failure processes.The future development directions of anticorrosive coatings in sub/supercritical water were predicted.
sub/supercritical waterhigh temperature and high pressurecorrosion resistance mechanismcoatingreview
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