A New Design Inorganic Silicate Composite Coating and Its Oxidation Behavior at High Temperature in Steam Atmosphere

doi:10.11900/0412.1961.2021.00044

Acta Metall Sin

2022, Vol. 58

Issue (8): 1083-1092 DOI: 10.11900/0412.1961.2021.00044

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A New Design Inorganic Silicate Composite Coating and Its Oxidation Behavior at High Temperature in Steam Atmosphere

CONG Hongda¹, WANG Jinlong¹(

), WANG Cheng²^,³, NING Shen¹, GAO Ruoheng¹, DU Yao², CHEN Minghui¹, ZHU Shenglong², WANG Fuhui¹

^1.Shenyang National Key Laboratory for Materials Science, Northeastern University, Shenyang 110819, China
^2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.Jiangsu JITRI Road Engineering Technology and Equipment Research Institude Co. Ltd., Xuzhou 220005, China

Cite this article:

CONG Hongda, WANG Jinlong, WANG Cheng, NING Shen, GAO Ruoheng, DU Yao, CHEN Minghui, ZHU Shenglong, WANG Fuhui. A New Design Inorganic Silicate Composite Coating and Its Oxidation Behavior at High Temperature in Steam Atmosphere. Acta Metall Sin, 2022, 58(8): 1083-1092.

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Abstract

CB2 steel (ZG12Cr9Mo1Co1NiVNbNB) is a ferritic stainless steel with excellent creep properties at high temperature (550-700^oC) and is mainly used in 600^oC 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 650^oC 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.

Key words: CB2 steel inorganic potassium silicate coating steam atmosphere oxidation high-temperature oxidation

Received: 22 January 2021

ZTFLH:

TG178

Fund: 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)

About author: WANG Jinlong, associate professor, Tel: (024)83691562, E-mail: wangjinlong@mail.neu.edu.cn

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	Hongda CONG
	Jinlong WANG
	Cheng WANG
	Shen NING
	Ruoheng GAO
	Yao DU
	Minghui CHEN
	Shenglong ZHU
	Fuhui WANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2021.00044 OR https://www.ams.org.cn/EN/Y2022/V58/I8/1083

Table 1 The changes of color and state of different fillers after oxidation at 650^oC

Table 2 The solidification behaviors of AlH₂P₃O₁₀ in potassium silicate

Fig.1 Schematic of high-temperature oxidation device for corrosion test in steam atmosphere

Fig.2 Oxidation kinetic curves of CB2 steel and its inorganic coating after oxidized in high temperature steam atmosphere at 650^oC for 1000 h (a) and its locally enlarged part for the first 200 h (b)

Fig.3 XRD spectra of CB2 steel (a) and its inorganic coating (b) after oxidized in high-temperature steam atmosphere at 650^oC for 1000 h

Fig.4 Surface morphologies of CB2 specimen (a, c) and its inorganic coating (b, d) in high-temperature steam atmosphere at 650^oC for 500 h (a, b) and 1000 h (c, d)

Fig.5 Cross-sectional morphologies of CB2 specimen (a, c) and its inorganic coating (b, d) in high-temperature steam atomsphere at 650^oC for 500 h (a, b) and 1000 h (c, d) (The right figures in Fig.5c are the corresponding EDS result, and the inset in Fig.5d is the local enlargement of the box)

Table 3 EDS analyses of positions 1-4 in Fig.5

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