Oxidation Behavior of Three Different Ni-Cr Coatings in 630oC/25 MPa Supercritical Water

doi:10.11902/1005.4537.2023.042

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (1): 119-129 DOI: 10.11902/1005.4537.2023.042

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Oxidation Behavior of Three Different Ni-Cr Coatings in 630^oC/25 MPa Supercritical Water

YUAN Xiaohu¹^,², LI Dingjun², WANG Tianjian², GUO Xianping², ZHANG Naiqiang³, ZHU Zhongliang³(

)

^1.School of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
^2.State Key Laboratory of Long-Life High Temperature Materials, Dongfang Electric Corporation Dongfang Turbing Co., Ltd., Deyang 618000, China
^3.Key Laboratory of Power Station Energy Transfer, Conversion and System, Ministry of Education, North China Electric Power University, Beijing 102206, China

Cite this article:

YUAN Xiaohu, LI Dingjun, WANG Tianjian, GUO Xianping, ZHANG Naiqiang, ZHU Zhongliang. Oxidation Behavior of Three Different Ni-Cr Coatings in 630^oC/25 MPa Supercritical Water. Journal of Chinese Society for Corrosion and protection, 2024, 44(1): 119-129.

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Abstract

Oxidation behavior of FB2 steel for steam turbine and FB2 steel coated with three different coatings was comparatively investigated in 630^oC/25 MPa supercritical water (SCW). The three coatings are supersonic flame spraying Ni-Cr coating (SFS-NiCr), glass shot peened SFS-NiCr and emery belt grinded SFS-NiCr. Their oxidation mass change was intermittently measured by electron balance, while their microstructure and phase composition were characterized by means of SEM, XRD and XPS before and after oxidation test. Results show that the oxidation kinetics curve of FB2 material deviated from the parabola due to the spallation of the formed oxide scale during the oxidation process. The oxidation kinetics curves of coatings prepared by different processes seriously deviated also from the parabola. A double-layered oxide scale formed on FB2 steel, consisting of an Fe-rich outer Fe₃O₄, Fe₂O₃ and a Cr-rich inner oxide layer. The oxide scale formed on the three coatings are mainly composed of chromium-rich oxide. The phase composition of the oxide scales formed on FB2 steel and the three coatings changed with the increase of oxidation time. Finally, the oxidation mechanism of FB2 steel and three coatings in supercritical water was discussed.

Key words: coating oxidation supercritical water oxidation mechanism oxide film

Received: 21 February 2023 32134.14.1005.4537.2023.042

ZTFLH:

TK245

Fund: National Key R&D Project of China(2022YFB4100403)

Corresponding Authors: ZHU Zhongliang, E-mail: zhzl@ncepu.edu.cn

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	YUAN Xiaohu
	LI Dingjun
	WANG Tianjian
	GUO Xianping
	ZHANG Naiqiang
	ZHU Zhongliang

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.042 OR https://www.jcscp.org/EN/Y2024/V44/I1/119

Fig.1 Mass gains of FB2 steel (a) and three sprayed coatings with different treatments (b) during exposure in SCW at 630^oC

Fig.2 Surface morphologies of sprayed coatings treated by shot peening (a) and grinding (b)

Fig.3 Surface morphologies of FB2 steel (a1-a3) and sprayed coatings untreated (b1-b3) and treated by shot peening (c1-c3) and grinding (d1-d3) after exposure in 630^oC/25 MPa SCW for 100 h (a1-d1), 1000 h (a2-d2) and 3000 h (a3-d3)

Fig.4 Surface morphologies of FB2 steel (a, b) and Ni-Cr thermally sprayed coatings untreated (c, d) and treated by shot peening (e, f) and grinding (g, h) after exposure in 630℃/25 MPa SCW for 100 h

Table 1 Elements content of oxide scale formed on FB2 substrate and Ni-Cr Coating with different treatment processes after oxidation for 100 h

Fig.5 Surface morphologies of FB2 steel (a, b) and Ni-Cr thermally sprayed coatings untreated (c, d) and treated by shot peening (e, f) and grinding (g, h) after exposure in 630^oC/25 MPa SCW for 1000 h

Fig.6 Surface morphologies of the spallation zones of the oxide scale formed on FB2 steel exposed in 630^oC/25 MPa SCW for 3000 h: (a) low-magnification view, (b) high-magnification view of location 1, (c) low-magnification view, (d) high-magnification view of location 2, (e) high-magnification view of location 3, (f) high-magnification view of location 4

Fig.7 Surface morphologies of sprayed Ni-Cr coatings untreated (a, b) and treated by shot peening (c, d) and grinding (e, f) after exposure in 630^oC/25 MPa SCW for 3000 h

Table 2 The contents of EDS detected elements in marked points in Fig.7

Fig.8 XRD patterns of FB2 steel (a) and Ni-Cr coatings untreated (b) and treated by shot peening (c) and grinding (d) after exposure in 630^oC SCW for 100 and 3000 h

Fig.9 XPS spectra of the surfaces of FB2 steel after oxidation in SCW at 630^oC for 3000 h: (a) Fe 2p, (b) O 1s

Fig.10 XPS spectra of the surfaces of three Ni-Cr coatings after oxidation in SCW at 630^oC for 3000 h: (a) general spectrum, (b) Ni 2p, (c) Cr 2p, (d) O 1s

Fig.11 Cross-sectional morphologies (a1-d1) and corresponding elemental depth profiles (a2-d2) of FB2 alloy (a1, a2) and thermally sprayed Ni-Cr coatings untreated (b1, b2) and treated by shot peening (c1, c2) and grinding (d1, d2) after exposure in SCW at 630^oC for 3000 h

Fig.12 Equilibrium oxygen partial pressures of Fe and Cr oxides at different temperatures

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