Corrosion behavior of Q235B carbon steel in simulated seawater pumped storage system under operational conditions -- Journal of Oceanology and Limnology,2020,38(5):1537-1547

	Cite this paper:
	YANG Dan, HUANG Yanliang, LI Jianqiu, GAO Yanming, ZHAO Xia, XU Weichen. Corrosion behavior of Q235B carbon steel in simulated seawater pumped storage system under operational conditions[J]. Journal of Oceanology and Limnology, 2020, 38(5): 1537-1547

Corrosion behavior of Q235B carbon steel in simulated seawater pumped storage system under operational conditions

YANG Dan^1,2,4,5, HUANG Yanliang^1,4,5, LI Jianqiu³, GAO Yanming³, ZHAO Xia^1,4,5, XU Weichen^1,4,5

1 CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 CSG Power Generation Co., Ltd., Guangzhou 511400, China;
4 Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China;
5 Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China

Abstract:

Seawater pumped storage systems have bright prospect for energy storage in the coming years. The operational conditions of seawater pumped storage system are complex and harsh, where metal materials suffer from severe general and local corrosion. The corrosion behavior of Q235B carbon steel in simulated seawater pumped storage system under operational conditions was studied by potentiodynamic polarization, cyclic potentiodynamic polarization, and scanning electron microscope (SEM). The results confirm that the working pressure affected the corrosion resistance of Q235B carbon steel during the whole immersion period. The pressure promoted the electrochemical reaction of corrosion process and the corrosion rate increased with pressure at the initial immersion period. However, the stable rust layer formed after longtime immersion at different pressures increased the corrosion resistance of carbon steel, and decreased the corrosion degree of carbon steel. Meanwhile, the working pressure affected the pitting corrosion behavior of Q235B carbon steel during the whole immersion period. The pitting corrosion potential was more negative and the tendency of pitting corrosion was higher at 4 MPa during the whole immersion period. However, pressure also accelerated the formation rate of protective rust layer on the steel surface. Q235B carbon steel has higher susceptibility to pitting corrosion at 4 MPa in the static seawater.

Key words: seawater pumped storage system|seawater pipeline|pressure|corrosion resistance|pitting corrosion

Received: 2020-01-18 Revised: 2020-03-11

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Articles by YANG Dan

Articles by HUANG Yanliang

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Articles by XU Weichen

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