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

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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.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2018-08
Language
English
Article Type
Article
Keywords

NICKEL-BASE ALLOYS; PASSIVE FILMS; PITTING CORROSION; CREVICE CORROSION; CHLORIDE SOLUTIONS; FE-CR; REPASSIVATION KINETICS; CHEMICAL-COMPOSITION; ELECTRONIC-STRUCTURE; SULFIDE INCLUSIONS

Citation

CORROSION SCIENCE, v.140, pp.61 - 72

ISSN
0010-938X
DOI
10.1016/j.corsci.2018.06.021
URI
http://hdl.handle.net/10203/244954
Appears in Collection
MS-Journal Papers(저널논문)
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