Extracellular polymeric substances secreted by marine fungus Aspergillus terreus: Full characterization and detailed effects on aluminum alloy corrosion. (December 2022)

• Record Type: Journal Article
• Authors: He, Jiaqi; Tan, Yu; Liu, Haixian; Jin, Zhengyu; Zhang, Yuxuan; He, Feixiang; Yan, Zhixiang; Liu, Hongfang; Meng, Guozhe; Liu, Hongwei
• Is Part Of: Corrosion science. Volume 209(2022)
• Publication Date: 2022-12
• Subjects: Extracellular polymeric substances -- Fungi -- Aspergillus terreus -- Aluminum alloy -- Pitting corrosion; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110703
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: In this work, extracellular polymeric substances (EPS) secreted by marine fungus were fully characterized, and corrosion behavior and mechanism of aluminum alloy (AA) caused by EPS were studied. Approximately sixty species of proteins, nine monosaccharides and seven organic acids were characterized. Electrochemical measurements indicated that EPS enable the acceleration of AA corrosion, hence promoting the formation of corrosion pits. The pitting corrosion is formed because of a big cathode and small anode created by EPS. Nevertheless, the formation of a complete EPS film on the specimen surface results in a decreasing acceleration of corrosion. Highlights: Extracellular polymeric substances (EPS) of marine fungi are characterized. Corrosion behavior and mechanism of aluminum alloy (AA) caused by EPS are studied. The specific species of proteins, monosaccharides and organic acids are identified. EPS can accelerate AA corrosion. Corrosion acceleration effect of EPS is related to its concentration.