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

Journal of Oceanology and Limnology 2020年第5期38卷 1537-1547页

作者： YANG Dan HUANG Yanliang LI Jianqiu GAO Yanming ZHAO Xia XU Weichen CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China CSG Power Generation Co. Ltd.Guangzhou 511400China Open Studio for Marine Corrosion and Protection Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237Chin a 5 Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

seawater pumped storage systems have bright prospect for energy storage in the coming *** operational conditions of seawater pumped storage system are complex and harsh,where metal materials suff er from severe general and local *** 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 confi rm that the working pressure aff ected the corrosion resistance of Q235B carbon steel during the whole immersion *** pressure promoted the electrochemical reaction of corrosion process and the corrosion rate increased with pressure at the initial immersion ***,the stable rust layer formed after longtime immersion at diff erent pressures increased the corrosion resistance of carbon steel,and decreased the corrosion degree of carbon ***,the working pressure aff ected the pitting corrosion behavior of Q235B carbon steel during the whole immersion *** pitting corrosion potential was more negative and the tendency of pitting corrosion was higher at 4 MPa during the whole immersion ***,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.

关键词： seawater pumped storage system seawater pipeline pressure corrosion resistance pitting corrosion

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