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


Other title
alloy 800
low valence sulphur
Type of item
Degree grantor
University of Alberta
Author or creator
Kulandaivel, Santhoshkumar
Supervisor and department
Luo, Jingli (Chemical and Materials Engineering)
Examining committee member and department
Yu, Tong ( Civil and Environmental Engineering)
Chen, Weixing (Chemical and Materials Engineering)
Department of Chemical and Materials Engineering

Date accepted
Graduation date
Master of Science
Degree level
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.
License granted by SANTHOSHKUMAR KULANDAIVEL ( on 2011-09-14 (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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File title: Chapter 1 Introduction
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