Journal
CORROSION SCIENCE
Volume 147, Issue -, Pages 32-40Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2018.11.005
Keywords
Ni-Cr-Mo; Hastelloy; Transpassive; Repassivation; Molybdenum; AESEC
Funding
- National Sciences and Engineering Research Council of Canada (NSERC)
- Chinese Scholarship Council (CSC)
- ECS H. H. Uhlig Summer Fellowship
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The role of alloyed Mo during transpassive dissolution of four commercially available Ni-based alloys in neutral chloride solution was investigated by atomic emission spectroelectrochemistry. Time-resolved dissolution rates of Ni, Cr, Mo, and Fe were obtained as a function of applied potential. Mo enrichment occurred at the trans passive potentials and redissolved when the potential returned to the passive domain. These results suggest a mechanism of Mo enrichment and release that could play a significant role in repassivation in initially neutral electrolytes such as occurs during crevice corrosion. It is proposed that Mo precipitation and redissolution are driven by local pH changes.
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