A study of passivity and stress corrosion cracking (SCC) of alloy 800 in simulated steam generator crevice solution containing thiosulfate and sulphide species

  • Author / Creator
    Kulandaivel, Santhoshkumar
  • The passivity and stress corrosion cracking (SCC) behavior of Alloy 800 was studied in test solution containing thiosulfate and sulphide species. Cyclic polarization experiments in thiosulfate containing solutions indicated that with an increase in the concentration of thiosulfate, both the pitting potential and the passive range were decreased. The presence of deflection promoted material degradation. Cyclic polarization test in solution containing sulphide indicated that Alloy 800 was susceptible to anodic dissolution. Mott-Schottky results showed that the donor density of the passive film increased with an increase in the concentration of low valence sulphur species. The SCC of Alloy 800, with an applied deflection of 0.356 mm, was studied under different applied potentials in test solution containing 0.075 M thiosulfate. Alloy 800 was susceptible to SCC in transpassive potential region (-110 mV). The x-ray photoelectron spectroscopy (XPS) and secondary ion mass spectroscopy (SIMS) analysis showed that the degradation of the passive film caused by the reduction reaction of thiosulfate was the cause of Sy-SCC.

  • Subjects / Keywords
  • Graduation date
  • Type of Item
  • Degree
    Master of Science
  • DOI
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
  • Language
  • Institution
    University of Alberta
  • Degree level
  • Department
    • Department of Chemical and Materials Engineering
  • Supervisor / co-supervisor and their department(s)
    • Luo, Jingli (Chemical and Materials Engineering)
  • Examining committee members and their departments
    • Yu, Tong ( Civil and Environmental Engineering)
    • Chen, Weixing (Chemical and Materials Engineering)