Journal
CORROSION SCIENCE
Volume 209, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2022.110703
Keywords
Extracellular polymeric substances; Fungi; Aspergillus terreus; Aluminum alloy; Pitting corrosion
Funding
- Guangdong Basic and Applied Basic Research Foundation [2019A1515011135]
- Fundamental Research Funds for the Central Universities, Sun Yat-sen University [19lgzd18, 22qntd0801]
- National Natural Science Foundation of China [51901253]
- Open Project Program of Hubei Key Laboratory of Materials Chemistry and Service Failure [2020MCF02]
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This work fully characterizes the extracellular polymeric substances (EPS) secreted by marine fungus and studies the corrosion behavior and mechanism of aluminum alloy caused by EPS. Approximately sixty species of proteins, nine monosaccharides, and seven organic acids have been identified. Electrochemical measurements show that EPS accelerates the corrosion of aluminum alloy, thereby promoting the formation of corrosion pits. However, the formation of a complete EPS film on the specimen surface reduces the acceleration of corrosion.
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.
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