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Alloy design employing high Cr concentrations for Mo-free stainless steels with enhanced corrosion resistance

Authors
Jung, KiMinAhn, SooHoonKim, YoungJunOh, SeKwonRyu, Won-HeeKwon, HyukSang
Issue Date
Aug-2018
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Keywords
Stainless steel (A); Localised corrosion; Repassivation (C); Passive films (C); Molybdenum; Pitting corrosion (C)
Citation
CORROSION SCIENCE, v.140, pp 61 - 72
Pages
12
Journal Title
CORROSION SCIENCE
Volume
140
Start Page
61
End Page
72
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/4402
DOI
10.1016/j.corsci.2018.06.021
ISSN
0010-938X
1879-0496
Abstract
In this study, we demonstrate the strategic replacement of Mo with excess Cr in Fe-Cr alloys and report their corrosion resistances. To better understand pitting corrosion, the electrochemical properties of the passive films observed on different alloys (Fe-20Cr-2Mo and Fe-25Cr) were compared. Mo-free Fe-25Cr offered comparable or better pitting corrosion resistance than Fe-20Cr-2Mo during film breakdown, repassivation, and pit propagation stages. We investigated the reason for enhanced stability against pitting corrosion as a result of Mo exclusion in such alloys. Mo accelerated co-dissolution of Fe and Mo itself, consequently enriching Cr on the surface and ultimately promoting onset of passivity.
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