TECHNOLOGY 出版

标题:Enhancing oxide scale growth and adhesion via electrochemically regulating ion diffusion

作者: Wang, PL (Wang, Peilin); Du, KF (Du, Kaifa); Yin, HY (Yin, Huayi); Wang, DH (Wang, Dihua)

来源出版物: JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 卷: 158 页: 133-144 DOI: 10.1016/j.jmst.2023.02.032 出版年: SEP 20 2023

摘要: Pre-oxidation is a common surface treatment approach to enhance the corrosion resistance of met-als, which suffers from slow ion diffusion kinetics, bad oxide scale adhesion, and weak compactness. Herein, we propose an electrochemical oxidation approach in molten carbonate to improve the oxide scale growth and adhesion via electrochemically regulating ion diffusion in the formed oxide scale. An anodic polarization applied at the metal substrate enlarges the chemical potential gradient of oxygen and offers a favorable electric field across the metal/oxide interface to the oxide scale/molten salt interface, thereby speeding up the oxide scale growth rate in terms of increasing the diffusion rate of metal cations and oxygen ions through the oxide scale. At the same time, the oxide scale adhesion is remarkedly im-proved because the metal vacancies at the oxide/alloy interface are filled by the newly formed oxide. After being treated by electrochemical oxidation, the corrosion rate of the Ni-16Fe-4Mo alloys in molten Li2CO3-Na2CO3-K2CO3 decreased ten-fold. Overall, electrochemical oxidation enables the rapid formation of an adherent and corrosion-resistant oxide scale on the metal substrate, offering a general and effective way to fabricate corrosion-resistant films to survive in various aggressively corrosive media.(c) 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

作者关键词: Molten salt; High-temperature oxidation; Anodic polarization; Corrosion protection; Inert anode

地址: [Wang, Peilin; Du, Kaifa; Yin, Huayi; Wang, Dihua] Wuhan Univ, Sch Resource & Environm Sci, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430072, Peoples R China.

通讯作者地址: Du, KF; Wang, DH (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430072, Peoples R China.

电子邮件地址: dukf@whu.edu.cn; wangdh@whu.edu.cn

影响因子：10.32