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Published on: May 6, 2019
Enhancing microbiologically influenced corrosion of Al-Zn-In-Cd sacrificial anode by Pseudomonas sp. in marine tidal
Hui Su1, Boxin Wei2, Enze Zhou3
1School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China.
Abstract:
This study investigated the microbiologically influenced corrosion (MIC) of Al-Zn-In-Cd sacrificial anode in the simulated marine tidal environment, elucidating the corrosion mechanism arising from the interaction between microorganisms and dynamic marine tide. Results revealed significant spatial variations in corrosion distribution, with the fully immersed zone (FIZ) exhibiting the most severe corrosion. Metabolic activity of Pseudomonas sp. enhanced anodic dissolution, markedly increasing the corrosion rate and raising the corrosion current density (icorr) by an order of magnitude. Furthermore, it altered the composition of corrosion products, forming loose and porous iron-rich products that compromised the protective qualities of corrosion products. Periodic wet-dry cycles further destabilized the corrosion products and accelerated pitting. These findings offer insights that inform the optimization of material design and improve the service life of Al-Zn-In-Cd sacrificial anodes in marine tidal environments.
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