Journal
COATINGS
Volume 12, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/coatings12111717
Keywords
superhydrophobic; mechanical durability; 2024 aluminum alloy; two-step chemical etching method
Categories
Funding
- Sichuan Science and Technology Program
- Deyang Science and Technology Program
- Natural Science Foundation of Sichuan Engineering Technical College
- [2021YFG0283]
- [2020SZZ046]
- [YJ2020KJ-07]
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In this study, a superhydrophobic 2024 aluminum alloy surface with highly enhanced mechanical durability was prepared using a two-step chemical etching method. The results showed that the hierarchical rough surface structure was the key factor for achieving the highly enhanced mechanical durability.
The mechanical durability of a superhydrophobic aluminum alloy surface is an important indicator of its practical use. Herein, we propose a strategy to prepare a superhydrophobic 2024 aluminum alloy surface with highly enhanced mechanical durability by using a two-step chemical etching method, using a NaOH solution as the etchant in step one and a Na2CO3 solution as the etchant in step two. Robust mechanical durability was studied by static contact angle tests before and after an abrasion test, potentiodynamic polarization measurements after an abrasion test and electrochemical impedance spectroscopy tests after an abrasion test. Furthermore, the mechanism for enhanced mechanical durability was investigated through scanning of electron microscopy images, energy-dispersive X-ray spectra, Fourier transform infrared spectra and X-ray photoelectron spectra. The testing results indicate that a hierarchical rough surface consisting of regular micro-scale dents and some nano-scale fibers in the micro-scale dents, obtained with the two-step chemical etching method, contributes to highly enhanced mechanical durability. Meanwhile, the as-prepared superhydrophobic 2024 aluminum alloy surface retained a silvery color instead of the black shown on the superhydrophobic 2024 aluminum alloy surface prepared by a conventional one-step chemical etching method using NaOH solution as the etchant.
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