海洋湖沼学报(英文) · 2020年第5期1537-1547,共11页

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

作者:YANG Dan,HUANG Yanliang,LI Jianqiu,GAO Yanming,ZHAO Xia,XU Weichen

摘要: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 suff er 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 confi rm that the working pressure aff ected 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 diff erent pressures increased the corrosion resistance of carbon steel,and decreased the corrosion degree of carbon steel.Meanwhile,the working pressure aff ected 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.

发文机构:CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling University of Chinese Academy of Sciences CSG Power Generation Co. Open Studio for Marine Corrosion and Protection a 5 Center for Ocean Mega-Science

关键词:seawaterpumpedstoragesystemseawaterpipelinepressurecorrosionresistancepittingcorrosion

分类号: TG1[金属学及工艺—金属学]

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