A New Design Inorganic Silicate Composite Coating and Its Oxidation Behavior at High Temperature in Steam Atmosphere
Received date: 2021-01-22
Revised date: 2021-03-22
Online published: 2021-05-20
Supported by
National Natural Science Foundation of China(51671053);National Natural Science Foundation of China(51801021);Ministry of Industry and Information Technology Project(MJ-2017-J-99)
CB2 steel (ZG12Cr9Mo1Co1NiVNbNB) is a ferritic stainless steel with excellent creep properties at high temperature (550-700oC) and is mainly used in 600oC ultrasupercritical units. The poor oxidation resistance of the material limits its practical applications in harsh, high-temperature environments, in which the steam unit faces high-temperature water vapor for a long period of time. Therefore, surface modification or coating has become an important means to improve the high-temperature oxidation resistance of the material. An inorganic silicate coating has the advantages of high thermal-chemical stability, similar thermal expansion coefficient, and simple preparation process, which can significantly improve the oxidation and corrosion resistance of the material. In this study, a new type of inorganic silicate composite coating was designed, based on the CB2 steel. The oxidation behavior of CB2 steel and coated specimens at 650oC high-temperature steam atmosphere for 1000 h was studied by using a high-temperature water vapor simulation device. The results showed that the oxidation rate of the coated CB2 steel was 30 times slower than that of uncoated CB2 steel; thus, the coating exhibited a good protective effect. After 1000 h of oxidation, the oxide scale on the CB2 steel was loose and cracked with obvious voids and the oxidation product was mainly composed of Fe2O3. The inorganic silicate composite coating significantly improved the oxidation resistance of CB2 steel; after 1000 h of oxidation, no spallation areas or cracks were found.
Hongda CONG , Jinlong WANG , Cheng WANG , Shen NING , Ruoheng GAO , Yao DU , Minghui CHEN , Shenglong ZHU , Fuhui WANG . A New Design Inorganic Silicate Composite Coating and Its Oxidation Behavior at High Temperature in Steam Atmosphere[J]. Acta Metall Sin, 2022 , 58(8) : 1083 -1092 . DOI: 10.11900/0412.1961.2021.00044
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