Journal of Shanghai Jiaotong University ›› 2016, Vol. 50 ›› Issue (02): 215-221.

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Electrochemical Investigation of Corrosion Behavior of 304 and 316L Stainless Steels in HighTemperature Water

DUAN Zhengang1,DU Donghai1,ZHANG Lefu1,MENG Fanjiang2,SHI Xiuqiang2   

  1. (1. School of Nuclear Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. Shanghai Nuclear Engineering Research and Design Institute, Shanghai 200233, China)
  • Received:2014-12-22 Online:2016-02-29 Published:2016-02-29

Abstract: Abstract: The effects of temperature and dissolved oxygen (DO) on electrochemical behaviors and the oxide films formed on type 304 and 316L stainless steels in primary water in simulated pressured water reactor (PWR) were investigated by means of potentiodynamic polarization measurements, scanning electron microscope (SEM) observation and energy dispersive Xray spectrum (EDS). The results revealled that the passivity of the oxide films degraded with increasing solution temperature. The corrosion potential (Ecorr) shifted to positive direction while corrosion current density (Jcorr) decreased significantly with the increase of DO. The oxide films formed on 304 and 316L stainless steels showed a doublelayer characteristic, and the size of oxide particles and the space between oxide particles on outer layer increased with increasing temperature but decreased with increasing DO. The type 316L stainless steels exhibited superior corrosion resistant characteristics than 304 SS in all investigated conditions.

Key words: Key words: stainless steel, pressured water reactor (PWR), hightemperature, electrochemistry behavior, corrosion behavior

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