Abstract
Focusing on alloy system, a facile strategy was proposed to fabricate a micro/nano-structured bionic superhydrophobic surface with enhanced anti-corrosion performance. It was implemented on iron carbon alloy substrate by combining one-step anodic oxidation with designed annealing to realize a protective armor. The study verified that the metallographic features in the alloy system and heredity during the anodic oxidation were crucial preconditions to construct bionic surface. The reconstruction of the anodized oxide films triggered by designed annealing changed the wetting mechanism as well as switching the hydrophilic/hydrophobic state by forming a smaller size point-to-point contact (Cassie-Baxter State) with the droplets. The synergistic effect of this unique bionic structures and low surface energy coating made the sample surface exhibit superhydrophobic state and excellent corrosion resistance. Such combination strategy lays the foundation for constructing functional surfaces of alloy systems. More importantly, it can be extended to multicomponent alloy systems, by selecting structure features even modulating feature components to simply realize a devisable protective armor, which provides more in-depth thinking for solving the longstanding corrosion problems of engineering materials.
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