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Temporary Inhibition of the Corrosion of AZ31B Magnesium Alloy by Formation of Bacillus subtilis Biofilm in Artificial Seawater

1
School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
2
State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, Kunming 650091, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(3), 523; https://doi.org/10.3390/ma12030523
Received: 10 December 2018 / Revised: 8 January 2019 / Accepted: 26 January 2019 / Published: 10 February 2019
(This article belongs to the Section Corrosion and Materials Degradation)
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Abstract

It is well known that microorganisms tend to form biofilms on metal surfaces to accelerate/decelerate corrosion and affect their service life. Bacillus subtilis was used to produce a dense biofilm on an AZ31B magnesium alloy surface. Corrosion behavior of the alloy with the B. subtilis biofilm was evaluated in artificial seawater. The results revealed that the biofilm hampered extracellular electron transfer significantly, which resulted in a decrease of icorr and increase of Rt clearly compared to the control group. Moreover, an ennoblement of Ecorr was detected under the condition of B. subtilis biofilm covering. Significant reduction of the corrosion was observed by using the cyclic polarization method. All of these prove that the existence of the B. subtilis biofilm effectively enhances the anti-corrosion performance of the AZ31B magnesium alloy. This result may enhance the usage of bio-interfaces for temporary corrosion control. In addition, a possible corrosion inhibition mechanism of B. subtilis on AZ31B magnesium alloy was proposed. View Full-Text
Keywords: AZ31B magnesium alloy; biofilm; cyclic voltammetry; corrosion mechanism AZ31B magnesium alloy; biofilm; cyclic voltammetry; corrosion mechanism
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Kang, Y.; Li, L.; Li, S.; Zhou, X.; Xia, K.; Liu, C.; Qu, Q. Temporary Inhibition of the Corrosion of AZ31B Magnesium Alloy by Formation of Bacillus subtilis Biofilm in Artificial Seawater. Materials 2019, 12, 523.

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