Corrosion behavior of Q235B carbon steel in simulated seawater pumped storage system under operational conditions
- PDF / 3,076,855 Bytes
- 11 Pages / 595.276 x 841.89 pts (A4) Page_size
- 33 Downloads / 229 Views
Corrosion behavior of Q235B carbon steel in simulated seawater pumped storage system under operational conditions* YANG Dan1, 2, 4, 5, HUANG Yanliang1, 4, 5, **, LI Jianqiu3, GAO Yanming3, ZHAO Xia1, 4, 5, XU Weichen1, 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, Guangdong 511400, China
4
Open Studio for Marine Corrosion and Protection, Qingdao National Laboratory for Marine Science and Technology, Qingdao
5
Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
266237, China
Received Jan. 18, 2020; accepted in principle Mar. 11, 2020; accepted for publication Jul. 14, 2020 © Chinese Society for Oceanology and Limnology, Science Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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. Keyword: seawater pumped storage system; seawater pipeline; pressure; corrosion resistance; pitting corrosion
1 INTRODUCTION Pumped storage system (PSS) is the most mature and the most competitive technology for energy storage at a large-scale all over the world. PSS plays an extremely significant role in the power grid in China (Wu et al., 2019). Coastal regions have the abundant renewable resources and the advanced economies that required huge electricity support (Ozkan and Mayo, 2019). Wind farms, solar photovoltaic, solar thermal power stations, tidal power stations, and wave power stations are developed
increasingly for electricity generation that wi
Data Loading...