Research on the preparation and corrosion resistance of integrated NiTi alloy bionic superhydrophobic corrosion-resistant surface based on additive manufacturing technology

Abstract

Wettable surfaces on metal substrates have garnered significant attention due to their critical role in aerospace and medical applications, particularly in enhancing corrosion resistance. However, achieving a transition in metal surface wettability often necessitates secondary processing of the substrate surface, which is typically limited to components with simple geometries. The direct fabrication of corrosion-resistant structures on complex component surfaces remains a considerable challenge. This paper proposes a novel method for the direct preparation of corrosion-resistant structures on intricate parts utilizing additive manufacturing technology, successfully fabricating three bionic corrosion-resistant structures. The results indicate that the bionic lotus leaf structure sample, with a height of 500 μm, exhibits the best corrosion resistance, demonstrating an order of magnitude improvement over the original sample and achieving the highest contact angle value of 150.1°. Notably, the bionic lotus leaf structure (I_corr = 9.8 ± 0.8 × 10⁻⁸ A/cm²) outperforms both the bionic cicada wing structure (I_corr = 1.2 ± 0.7 × 10^-6 A/cm²) and the bionic shark skin structure (I_corr = 1.7 ± 0.7 × 10⁻⁷ A/cm²) in terms of corrosion resistance.