The effect of dissolved oxygen and Shewanella algae on the corrosion mechanism of titanium in a simulated marine environment
Jiaqi Li (Northeastern University)
Yuting Jin (Liaoning Academy of Materials)
Jiahang Li (Northeastern University)
Zhong Li (Northeastern University)
Mingxing Zhang (Northeastern University)
Dake Xu (Northeastern University)
JMC Mol (TU Delft - Team Arjan Mol)
Fuhui Wang (Northeastern University)
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Abstract
The influence of dissolved oxygen (DO) and Shewanella algae on the corrosion behavior of pure titanium were systematically studied in this work. The formation of S. algae biofilms on titanium surface was facilitated by the anaerobic environment, which accelerated titanium corrosion. Upon the breakdown of passive film, S. algae acquired electrons from the titanium base substrate through extracellular electron transfer (EET) processes. Various EET-related genes were overexpressed by the low DO condition, leading to enhanced EET kinetics. High concentration DO increased TiO2 content and the thickness of passive film, which enhanced the protective effect and mitigated microbiologically influenced corrosion.