Protective Performance of a Novel Inorganic Composite Coatings on CB2 Ferritic Heat Resistant Steel at 650℃ in Oxygen Flow with Water Vapor

doi:10.11901/1005.3093.2020.309

Chinese Journal of Materials Research

2021, Vol. 35

Issue (9): 675-681 DOI: 10.11901/1005.3093.2020.309

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Protective Performance of a Novel Inorganic Composite Coatings on CB2 Ferritic Heat Resistant Steel at 650℃ in Oxygen Flow with Water Vapor

CHEN Yiwen¹, WANG Cheng¹^,³(

), LOU Xia¹, LI Dingjun¹, ZHOU Ke¹, CHEN Minghui⁴^,⁵, WANG Qunchang⁴, ZHU Shenglong²^,⁴^,⁵, WANG Fuhui⁴^,⁵

^1.State Key Laboratory of Long-life High Temperature Materials, Dong Fang Turbine Co. , Ltd. Deyang, 61800, China
^2.Shichangxu Advanced Materials Innovation Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
^3.Jiangsu JITRI Road Engineering Technology and Equipment Research Institute Co. , Ltd. Xuzhou 220005, China
^4.School of Materials Science and Engineering, Northeastern University, Shenyang 110189, China
^5.Shenyang National Laboratory for Materials Science, Shenyang 110016, China

Cite this article:

CHEN Yiwen, WANG Cheng, LOU Xia, LI Dingjun, ZHOU Ke, CHEN Minghui, WANG Qunchang, ZHU Shenglong, WANG Fuhui. Protective Performance of a Novel Inorganic Composite Coatings on CB2 Ferritic Heat Resistant Steel at 650℃ in Oxygen Flow with Water Vapor. Chinese Journal of Materials Research, 2021, 35(9): 675-681.

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Abstract

A novel inorganic silicate composite coating was prepared by physical blending process with potassium silicate of module 3.25 as binder, alpha alumina, copper chromium black and white mica as pigment, and proper amount curing agent. Then the oxidation behavior of the ZG12Cr9Mo1Co1NiVNbNB (CB2) ferritic heat resistant steel without and with the composite coating was comparatively investigated at 650°C in atmosphere of oxygen flow with 20% water vapors. The results show that serious oxidation of CB2 steel occurred, which follows the parabolic law in different periods and resulted in the formation of a two-layered oxide scale of poorly protective Fe₂O₃. The application of the composite coating could reduce markedly the oxidation rate of the CB2 steel, meanwhile the coating presented also excellent resistance to cyclically thermal shock. Furthermore, a thin and continuous Cr-rich oxide layer could be detected on the steel surface beneath the composite coating after the oxidation test, to which the enhancement of oxidation resistance of the coated CB2 steel may be ascribed.

Key words: materials failure and protection inorganic compound coatings high temperature water vapor oxidation CB2 heat resistance steel

Received: 23 July 2020

ZTFLH:

TG174.45

Fund: State Key Laboratory of Long-life High Temperature Materials(DTCC28EE190229);National Key R&D Program of China(2018YFB2003601)

About author: WANG Cheng, Tel: (024)23904856, E-mail: chengjitri@163.com

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	Articles by authors
	Yiwen CHEN
	Cheng WANG
	Xia LOU
	Dingjun LI
	Ke ZHOU
	Minghui CHEN
	Qunchang WANG
	Shenglong ZHU
	Fuhui WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.309 OR https://www.cjmr.org/EN/Y2021/V35/I9/675

Fig.1 Oxidation kinetics of CB2 steel in an environment containing water vapor at 650℃

Table 1 Parabolic rate constant K_p of CB2 at 650℃

Fig.2 Surface (a) and sectional (b) SEM morphologies of CB2 steel after oxidation in an environment coating water vapor at 650℃

Fig.3 XRD patterns of CB2 steel

Fig.4 Surface (a) and sectional (b) SEM morphologies of coated CB2 steel after oxidation in an environment coating water vapor at 650℃

Fig.5 Surface (a) and sectional (b) SEM morphologies of coatings after 50 thermal shocks

Fig.6 EDS line scanning of coated CB2 steel after oxidation (a) SEM (b) element distribution

Fig.7 Cr rich oxides at the interface of the coatings and CB2 steel

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