3D printing of living microbial coating for metal corrosion protection

摘要

The corrosion failure of marine engineering materials leads to significant economic losses and may trigger safety accidents. Traditional corrosion pr evention strategies have been hindered by their environmental hazards, complex processes, and high costs. Recently, the application of living microbes for corrosion protection has attracted much attention, but this approach is limited by the dynamic nature of microbial biofilms. Herein, we designed a bio -ink composed of sodium alginate, gelatin, and sodium lignosulfonate by screening for adhesive strength and mechanical properties. By incorporating Vibrio natriegens with strong mineralization capabilities, a living coating that exhibits excellent corrosion protection performance was developed. It was corrobarated by electrochemical corrosion tests, morphological characterization, and corrosion product analysis. Furthermore, we optimized the 3D printing param eters of the bio-adhesive coating, enabling its application in corrosion protection under special environment. This study provides a novel approach for the development of environmentally friendly, renewable, and cost -effective corrosion protection technologies based on living microbes.