Insights into the mechanism of Mo protecting CoCrFeNi HEA from pitting corrosion—A quantitative modelling study on passivation and repassivation processes

doi:10.1016/j.jmst.2023.09.032

Abstract

Abstract: Mo has been widely reported as a conducive element for the corrosion resistance of massive alloy systems. However, the mechanism of Mo optimizing the corrosion resistance is complicated, and in-depth studies are still required. The present work comprehensively and quantitatively studied the critical influences of Mo on the passivation and repassivation behavior of CoCrFeNi HEA based on the dissolution-diffusion-deposition model proposed in our previous work. The experimental results indicated that Mo remarkably eliminated the metastable pitting corrosion, significantly improved the breakdown potential and perfectly protected the CoCrFeNiMo_0.2 HEA from pitting corrosion. The modelling and X-ray photoelectron spectroscopy (XPS) results both show that in the passivation process, MoO₂ was the last product to deposit, thereby existing in the outer layer of the passive film. Mo addition increased the Cr content by weakening the deposition of Fe₂O₃ and Fe₃O₄ and also improved the Cr₂O₃/Cr(OH)₃ ratio by promoting deprotonation of Cr(OH)₃, thus enhancing the quality of passive film. Besides, when pitting corrosion occurred, MoO₂, MoO₃, and FeMoO₄ were the first products to deposit and accelerated the repassivation process of HEA by timely covering the matrix in the pit cavity, thereby preventing further corrosion of the matrix.

Key words: High entropy alloy, Modelling studies, Passive films, Pitting corrosion, Repassivation process

Jing Dai, Hao Feng, Hua-Bing Li, Hong-Chun Zhu, Shu-Cai Zhang, Jin-Dong Qu, Tong He, Zhou-Hua Jiang, Tao Zhang. Insights into the mechanism of Mo protecting CoCrFeNi HEA from pitting corrosion—A quantitative modelling study on passivation and repassivation processes[J]. J. Mater. Sci. Technol., 2024, 182: 152-164.

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