The effect of dissolved oxygen and Shewanella algae on the corrosion mechanism of titanium in a simulated marine environment.

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 TiO 2 content and the thickness of passive film, which enhanced the protective effect and mitigated microbiologically influenced corrosion. [Display omitted] • Shewanella algae accelerated Ti corrosion while dissolved oxygen reduced MIC effect. • Anaerobic environment facilitated the formation of S. algae biofilms on Ti surface. • Dissolved oxygen increased TiO 2 content and the thickness of passive film. • Various EET-related genes of S. algae were overexpressed in anaerobic condition. [ABSTRACT FROM AUTHOR]