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

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-01-30 DOI:10.1016/j.corsci.2025.112756

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

引用次数: 0

Abstract

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.