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The Effect of Impurity Concentration and Cr Content on the Passive Oxide Films in Ferritic Stainless Steels

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Title: The Effect of Impurity Concentration and Cr Content on the Passive Oxide Films in Ferritic Stainless Steels
Authors: Ohtsuka, Toshiaki Browse this author →KAKEN DB
Abe, Masatoshi Browse this author
Ishii, Tomohiro Browse this author
Issue Date: 2015
Publisher: The Electrochemical Society (ECS)
Journal Title: Journal of the electrochemical society
Volume: 162
Issue: 10
Start Page: C528
End Page: C535
Publisher DOI: 10.1149/2.0621510jes
Abstract: The properties of passive oxides on three steels consisting of 11%Cr, 18%Cr, and 30%Cr-2%Mo were studied in acidic sulfate solution by the Mott-Schottky relation for semiconducting properties, potential modulation reflectance (PMR) spectroscopy for light absorption properties, X-ray photoelectron spectroscopy (XPS) for composition estimation, and Fe3+/Fe2+ redox current measurement for properties of electron transfer. The influence of the impurity concentration in the steels was also studied. The donor density in n-type semiconducting passive oxides as estimated from the Mott-Schottky plot decreased with a higher Cr content and with a lower impurity concentration. Cr enrichment occurred in the passive oxide and, for example, for 30Cr-2Mo steels, the ratio of Cr ions to total metallic ions in the passive oxide was approximately 70 wt%. The light absorption edge of the passive oxide measured by PMR was approximately 2.4 eV, irrespective of the Cr content and impurity concentration. The redox current on the passive oxide was much inhibited compared with that on the Pt electrode. The redox current decreased in a similar manner as the donor density. The inhibition of the redox current was assumed to be due to the space charge layer in the n-type semiconducting passive oxide.
Rights: © The Electrochemical Society, Inc. 2015. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in J. Electrochem. Soc., Volume 162, Issue 10, pp. C528-C535, 2015.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大塚 俊明

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