Abstract
The effects of chloride and thiosulfate ions on localized corrosion of alloy 800 are investigated through dynamical observation of the change in phase image of the diffusion layer during passive film breakdown using digital holography. The results indicate that solution chemistry has a significant effect on film breakdown and diffusion layer. The phase distribution changes at different applied potentials show that in the process of film breakdown, dissolution of metal ions from pitting is not remarkable in chloride-only solution, whereas dissolution of metal ions is significantly high in thiosulfate and chloride solution. Thiosulfate has a combined effect with chloride ions in passive film degradation.
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Acknowledgments
This work was supported by Natural Sciences and Engineering Research Council of Canada Discovery Grant and National Natural Science Foundation of China (No. 51371124). The authors also gratefully acknowledge R.L. Tapping, P. Angell, Yucheng Lu and Stan J. Klimas of AECL for supporting this work.
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Xia, DH., Luo, JL., Gao, ZM. et al. Monitoring the Diffusion Layer During Passive Film Breakdown on Alloy 800 with Digital Holography. Acta Metall. Sin. (Engl. Lett.) 28, 1170–1174 (2015). https://doi.org/10.1007/s40195-015-0309-6
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DOI: https://doi.org/10.1007/s40195-015-0309-6