Pitting corrosion behavior and mechanism of 316L stainless steel induced by marine fungal extracellular polymeric substances

被引：16
作者：
Liu, Haixian [1 ,2 ]
He, Jiaqi [1 ,2 ]
Jin, Zhengyu [1 ,2 ]
Liu, Hongwei [1 ,2 ,3 ]
机构：
[1] Sun Yat Sen Univ, Sch Chem Engn & Technol, Zhuhai 519082, Peoples R China
[2] Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519082, Peoples R China
[3] Sun Yat Sen Univ, Guangdong Engn Technol Res Ctr Platform Chem Marin, Zhuhai 519082, Peoples R China
来源：
CORROSION SCIENCE | 2023年 / 224卷
基金：
中国国家自然科学基金;
关键词：
Extracellular polymeric substances; Marine fungi; Aspergillus terreus; Pitting corrosion; 316L stainless steel; MIC; MICROBIOLOGICALLY INFLUENCED CORROSION; CARBON-STEEL; 304-STAINLESS-STEEL; BIOMINERALIZATION;
D O I：
10.1016/j.corsci.2023.111485
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this study, effect of extracellular polymeric substances (EPS) secreted by fungus Aspergillus terreus on the pitting corrosion of 316L stainless steels (SS) was deeply investigated by electrochemical measurements and surface analysis. Results demonstrated that adsorption of EPS can change surface wettability of 316L SS leading to a much more hydrophilic steel-water interface. EPS not only accelerates uniform corrosion but enhances pitting corrosion of 316L SS. EPS can promote the formation of metastable pitting corrosion and the subsequent growth of corrosion pits. The density of corrosion pits (>2 mu m) reach (5.6 +/- 0.5) x 10(3) pits/cm(2) when EPS is 400 mg/L.
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页数：16
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