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Research Article

Bio-inspired superhydrophobic magnesium alloy surfaces with active anti-corrosion and self-healing properties

Qiang Li1, Xudong Zhang1, Shuang Ben1, Zhihong Zhao1, Yuzhen Ning2( ), Kesong Liu1( ), Lei Jiang1
Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology School of Chemistry, Beihang University, Beijing 100191, China
School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China
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Graphical Abstract

A micro/nano structure-functional molecule superhydrophobic composite coating with active anti-corrosion and self-healing dual-function properties was constructed on the surface of Mg alloys. The dual-function superhydrophobic composite anti-corrosion coating could reduce the corrosion rate though trapping the corrosive Cl− meanwhile releasing corrosion inhibitive ion, and the damaged coating could self-healing by heat treatment.

Abstract

Bio-inspired superhydrophobic magnesium (Mg) alloy surfaces are of increasing interest in corrosion protection due to superior barrier and shielding effects. However, superhydrophobic (SHB) anti-corrosion surfaces are susceptible to damage, which limit their extensive applications. To this end, a micro/nano structure-functional molecule SHB composite coating with self-healing and active anti-corrosion dual-function properties was designed on Mg alloys substrate. The dual-function SHB composite anti-corrosion coating based on lauric acid (La) intercalated and modified hydrotalcite (La-LDH) consisted of three-layer structure, namely La-LDH powder/polydimethylsiloxane (PDMS)/La-LDH film. The anti-corrosion performance of as-prepared coatings was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results indicate that the SHB coating shows excellent active corrosion resistance. Moreover, we also examined the self-healing and anti-corrosion properties of SHB coating upon physical damage and explained the healing mechanism. After heat treatment, the damaged SHB coating regain its surface microstructure and corrosion protection property. This work expands new insights for the wide application of Mg alloys and the research in the field of metal protection.

Keywords

magnesium alloysanti-corrosion coatingsuperhydrophobicself-healingactive anti-corrosion property

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Nano Research
Volume 16 Issue 2,
February 2023
Pages 3312-3319
DOI: 10.1007/s12274-022-4937-7
Cite this article:
Li Q, Zhang X, Ben S, et al. Bio-inspired superhydrophobic magnesium alloy surfaces with active anti-corrosion and self-healing properties. Nano Research, 2023, 16(2): 3312-3319. https://doi.org/10.1007/s12274-022-4937-7
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Received: 01 July 2022
Revised: 08 August 2022
Accepted: 18 August 2022
Published: 17 October 2022
© Tsinghua University Press 2022
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