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

It is well known that microorganisms tend to form biofilms on metal surfaces to accelerate/decelerate corrosion and affect their service life. was used to produce a dense biofilm on an AZ31B magnesium alloy surface. Corrosion behavior of the alloy with the biofilm was evaluated in artificial seawater. The results revealed that the biofilm hampered extracellular electron transfer significantly, which resulted in a decrease of and increase of clearly compared to the control group. Moreover, an ennoblement of was detected under the condition of biofilm covering. Significant reduction of the corrosion was observed by using the cyclic polarization method. All of these prove that the existence of the 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 on AZ31B magnesium alloy was proposed.