In-situ construction of multilayered Fe2O3/CdZnS/ZnS composite film on EH40 steel with anti-corrosion and bacterial anti-adhesion capability in seawater

A nanostructured Fe2O3/CdZnS/ZnS composite film was constructed on EH40 steel using anodization, hydrothermal, and successive ionic layer absorption and reaction method. The film can inhibit the diffusion of dissolved oxygen to the substrate steel in aerobic seawater, and anodic dissolution of the substrate steel in D. vulgaris containing anaerobic seawater, respectively. The film can inactivate bacteria by producing active chlorine under light, which improves its anti-adhesion efficiency. The film prepared by 50 times of ZnS deposition reaches the highest anti-adhesion efficiency of 71.0 % and 63.3 % toward P. aeruginosa and D. vulgaris under dark, and 98.5 % and 96.0 % under light, respectively.