J. Mater. Sci. Technol. ›› 2021, Vol. 89: 158-166.DOI: 10.1016/j.jmst.2021.02.019

Previous Articles     Next Articles

Correlation between depassivation and repassivation processes determined by single particle impingement: Its crucial role in the phenomenon of critical flow velocity for erosion-corrosion

L.L. Lia,b, Z.B. Wanga,*(), S.Y. Hea,c, Y.G. Zhenga   

  1. aCAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
    bSchool of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
    cDepartment of Physics, Southern University of Science and Technology, Guangdong 518055, China
  • Received:2020-09-07 Revised:2021-01-05 Accepted:2021-02-10 Published:2021-10-30 Online:2021-10-30
  • Contact: Z.B. Wang
  • About author:*E-mail address: zbwang12s@imr.ac.cn (Z.B. Wang).

Abstract:

The correlation between depassivation and repassivation processes, which is significant in erosion-corrosion, was quantitatively investigated by single particle impingement tests at various flow velocities and impact angles. The results show that both repassivation and depassivation processes are associated with the kinetic energy of solid particle, and demonstrate that the repassivation is retarded by depassivation. This phenomenon probably results from the depassivation-induced microstructure evolution. On this basis, the dependence of critical flow velocity (CFV) for erosion-corrosion on the solid particle concentration and diameter is further theoretically predicted and experimentally verified. Accordingly, the crucial role of depassivation-repassivation in CFV phenomenon is further highlighted.

Key words: Erosion-corrosion, Stainless steel, Depassivation-repassivation, Single particle impact, Passive film