Abstract
The influence of marine aerobic biofilms on the corrosion of 316L stainless steel (SS) in aerated and deaerated seawater was studied by electrochemical impedance spectroscopy (EIS), potentiodynamic polarisation curves, current-potential curves and scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS). EIS and SEM-EDS results showed that the aerobic biofilms inhibited 316L SS corrosion within the test duration. Comparison of results under aerated and deaerated conditions revealed that O2 enhanced the inhibition efficiency of the aerobic biofilms. This result indicated that living cells were necessary for the aerobic biofilms to inhibit the corrosion of 316L SS. Polarization curves indicated that the biofilms mainly inhibited anode action. Current-potential curves under deaerated conditions showed that electron transfer processes occurred between microorganisms and electrodes. Moreover, 316L SS as an electron acceptor was protected from corrosion.
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Foundation Item: Item Sponsored by National Basic Research Program (973 Program) of China (2014CB643304, 2014CB643305); National Natural Science Foundation of China (51131008); The Open Fund of Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences (CKF201409)
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Xu, Fl., Duan, Jz., Lin, Cg. et al. Influence of marine aerobic biofilms on corrosion of 316L stainless steel. J. Iron Steel Res. Int. 22, 715–720 (2015). https://doi.org/10.1016/S1006-706X(15)30062-5
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DOI: https://doi.org/10.1016/S1006-706X(15)30062-5