High Temperature Corrosion Behavior of F22 Base Metal and Weld in Simulated Coastal Atmosphere

doi:10.11902/1005.4537.2022.182

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (3): 594-600 DOI: 10.11902/1005.4537.2022.182

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High Temperature Corrosion Behavior of F22 Base Metal and Weld in Simulated Coastal Atmosphere

LIU Zhihao¹, LIU Guangming¹(

), HE Sifan², DONG Meng², LI Yu¹, LI Futian¹, ZHU Ting¹

^1.School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
^2.DEC Dongfang Boiler Group Co. Ltd., Zigong 643001, China

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Abstract

The high temperature corrosion behavior of F22 base metal and weld at 510 ℃ in simulated coastal atmosphere was studied. The corrosion kinetic curves of base metal and weld was measured. The microstructure, chemical composition, phase constituent, surface and cross-sectional morphology of corrosion products were characterized by means of optical metallography, XRD and SEM/EDS. The results showed that both the weld and base metal of F22 steel showed mass gain during the corrosion process. The mass gain rate in the initial 250 h is faster than that in the subsequent corrosion process, while the corrosion rate of the weld is slightly greater than that of the base material. The kinetics followed parabolic law after 250 h corrosion. The corrosion product scale had a duplex microstructure, the outer layer was Fe₂O₃, and the inner layer was a mixture of Fe₂O₃, Fe₃O₄. Due to the low Cr content of the alloy, a protective Cr₂O₃ film did not form on the sample surface. The corrosion mechanism is briefly discussed too.

Key words: F22 steel coastal air high temperature corrosion

Received: 05 June 2022 32134.14.1005.4537.2022.182

ZTFLH:

TG172

Fund: National Natural Science Fundation of China(51961028)

Corresponding Authors: LIU Guangming, E-mail: gemliu@126.com

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	LIU Zhihao
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	LI Futian
	ZHU Ting

Cite this article:

LIU Zhihao, LIU Guangming, HE Sifan, DONG Meng, LI Yu, LI Futian, ZHU Ting. High Temperature Corrosion Behavior of F22 Base Metal and Weld in Simulated Coastal Atmosphere. Journal of Chinese Society for Corrosion and protection, 2023, 43(3): 594-600.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.182 OR https://www.jcscp.org/EN/Y2023/V43/I3/594

Fig.1 Physical drawing of F22 plate welding

Table 1 Chemical compositions of F22 base metal and weld joint

Fig.2 Schematic diagram of the coastal air environment simulating device

Fig.3 Metallographic photos of F22 base metal (a) and weld joint (b)

Fig.4 Corrosion kinetics (a) and fitting (b) curves of F22 base metal and weld joint during exposure at 510 ℃ for 3000 h in simulating coastal air

Fig.5 Surface morphologies (a, b) and EDS results (c, d) of F22 base metal (a, c) and weld joint (b, d) after exposure at 510 ℃ for 3000 h in simulating coastal air

Fig.6 Cross-sectional morphologies (a, b) and EDS line scannings (c, d) of F22 base metal (a, c) and weld joint (b, d) after exposure at 510 ℃ for 3000 h in simulating coastal air

Table 2 Elemental contents in the regions marked in Fig.6a and b (atomic fraction / %)

Fig.7 XRD patterns of F22 base metal and weld joint after exposure at 510 ℃ for 3000 h in simulating coastal air (a) and subsequently removing oxide layers with different thickness (b)

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