Characterization of the passive layer on ferrite and austenite phases of super duplex stainless steel

E. Rahimi, Ali Kosari, S. Hosseinpour*, Ali Davoodi, H. Zandbergen, Johannes M.C. Mol

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    8 Citations (Scopus)
    2 Downloads (Pure)

    Abstract

    In this study, we report on a combined microscopic, analytical and electrochemical characterization of the nanoscopic passive layer on a tungsten‑molybdenum-containing super duplex stainless steel. We used scanning transmission electron microscopy/energy dispersive X-ray spectroscopy, scanning Kelvin probe force microscopy, scanning tunneling spectroscopy, and Mott–Schottky electrochemical impedance spectroscopy analysis to correlate the local chemical composition and electronic properties of passive layers on austenite and ferrite phases. The passive layer on the ferrite phase contains a higher amount of Mo, W, and Cr, which accommodates a higher nobility of ferrite and a higher local energy of the band gap compared to those on the austenite. The two aforementioned phases exhibit a different composition and semi-conductive properties of their passive layers leading to dissimilar local corrosion susceptibility. These findings are of pivotal importance in further studies of austenite and ferrite phase resolved corrosion resistance of duplex stainless steel demanding a dedicated alloying strategy.

    Original languageEnglish
    Article number143634
    Number of pages8
    JournalApplied Surface Science
    Volume496
    DOIs
    Publication statusPublished - 2019

    Bibliographical note

    Accepted Author Manuscript

    Keywords

    • A. Stainless steel
    • B. SKPFM
    • B. STEM/EDS
    • B. STS
    • C. Passive film

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