{"title":"Counterintuitive passivation role of manganese in stainless steel under high potential in neutral NaCl solution","authors":"K.P. Yu, X.L. Chen, K.Q. Ye, M.X. Huang","doi":"10.1016/j.corsci.2025.112756","DOIUrl":null,"url":null,"abstract":"<div><div>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. MnO<sub>2</sub> 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.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"246 ","pages":"Article 112756"},"PeriodicalIF":7.4000,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Corrosion Science","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0010938X25000836","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
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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.
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.
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