{"title":"腐植酸介导的细胞外电子转移加速不锈钢钝化膜的降解","authors":"Yuntian Lou , Shengyu He , Weiwei Chang , Hao Zhang , Jingzhi Yang , Hongchang Qian , Xiangping Hao , Dawei Zhang","doi":"10.1016/j.corsci.2025.112696","DOIUrl":null,"url":null,"abstract":"<div><div>The influence of humic acid-mediated extracellular electron transfer (EET) of <em>Shewanella putrefaciens</em> CN32 in microbiologically influenced corrosion (MIC) on 304 stainless steel was investigated. Humic acid plays a key role in accelerating passive film degradation in the presence of <em>S. putrefaciens</em> CN32, with a concentration-dependent effect; but has no effect when alone. It facilitated the formation of larger biofilm and increased Fe and Cr dissolution, resulting in a thinner, weakened passive film and intensified pitting corrosion. In-situ scanning electrochemical microscopy demonstrated <em>S. putrefaciens</em> CN32 utilized humic acid to perform outward EET, injecting electrons into the passive film and accelerating MIC.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"245 ","pages":"Article 112696"},"PeriodicalIF":7.4000,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Accelerated degradation of stainless-steel passive film by humic acid-mediated extracellular electron transfer\",\"authors\":\"Yuntian Lou , Shengyu He , Weiwei Chang , Hao Zhang , Jingzhi Yang , Hongchang Qian , Xiangping Hao , Dawei Zhang\",\"doi\":\"10.1016/j.corsci.2025.112696\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>The influence of humic acid-mediated extracellular electron transfer (EET) of <em>Shewanella putrefaciens</em> CN32 in microbiologically influenced corrosion (MIC) on 304 stainless steel was investigated. Humic acid plays a key role in accelerating passive film degradation in the presence of <em>S. putrefaciens</em> CN32, with a concentration-dependent effect; but has no effect when alone. It facilitated the formation of larger biofilm and increased Fe and Cr dissolution, resulting in a thinner, weakened passive film and intensified pitting corrosion. In-situ scanning electrochemical microscopy demonstrated <em>S. putrefaciens</em> CN32 utilized humic acid to perform outward EET, injecting electrons into the passive film and accelerating MIC.</div></div>\",\"PeriodicalId\":290,\"journal\":{\"name\":\"Corrosion Science\",\"volume\":\"245 \",\"pages\":\"Article 112696\"},\"PeriodicalIF\":7.4000,\"publicationDate\":\"2025-04-01\",\"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/S0010938X2500023X\",\"RegionNum\":1,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"2025/1/9 0:00:00\",\"PubModel\":\"Epub\",\"JCR\":\"Q1\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Corrosion Science","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0010938X2500023X","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/1/9 0:00:00","PubModel":"Epub","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Accelerated degradation of stainless-steel passive film by humic acid-mediated extracellular electron transfer
The influence of humic acid-mediated extracellular electron transfer (EET) of Shewanella putrefaciens CN32 in microbiologically influenced corrosion (MIC) on 304 stainless steel was investigated. Humic acid plays a key role in accelerating passive film degradation in the presence of S. putrefaciens CN32, with a concentration-dependent effect; but has no effect when alone. It facilitated the formation of larger biofilm and increased Fe and Cr dissolution, resulting in a thinner, weakened passive film and intensified pitting corrosion. In-situ scanning electrochemical microscopy demonstrated S. putrefaciens CN32 utilized humic acid to perform outward EET, injecting electrons into the passive film and accelerating MIC.
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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