中性NaCl溶液中高电位条件下锰在不锈钢中的反直觉钝化作用

IF 10.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Corrosion Science Pub Date : 2025-04-15 Epub Date: 2025-01-30 DOI:10.1016/j.corsci.2025.112756

K.P. Yu, X.L. Chen, K.Q. Ye, M.X. Huang

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引用次数: 0

摘要

研究了铸态Fe-20.7Cr-17.7Mn-20.2Co-1.7Si合金在3.5 wt% NaCl溶液中的钝化行为，重点研究了Mn的钝化作用。观察到两个阶段的钝化过程：初始的cr基钝化，然后是710 mV/SCE左右的mn基二次钝化。随着电势的增大，钝化膜中的氧化物逐渐转变为氢氧化物，膜本身的缺陷也越来越大。MnO2的形成驱动了二次钝化，通过减少缺陷和增加钝化膜的厚度来提高耐腐蚀性。这项研究提供了锰在高电位下意外钝化行为的见解。

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Counterintuitive passivation role of manganese in stainless steel under high potential in neutral NaCl solution

The passivation behavior of a cast Fe-20.7Cr-17.7Mn-20.2Co-1.7Si alloy in a 3.5 wt% NaCl solution was investigated with an inclined focus on the passivation role of Mn. A two-stage passivation process was observed: initial Cr-based passivation, followed by Mn-based secondary passivation around 710 mV/SCE. As the potential increases, oxides in the passive film gradually transform into hydroxides, and the film itself becomes more defective. MnO₂ formation drives the secondary passivation, enhancing corrosion resistance by reducing defects and increasing the thickness of the passive film. This study provides insights into the unexpected passivation behavior of Mn at high potentials.

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.