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Fabrication of Self-Cleaning Superhydrophobic Surfaces with Improved Corrosion Resistance on 6061 Aluminum Alloys

School of Mechanical Engineering, Shandong University of Technology, Zibo 255000, China
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Micromachines 2020, 11(2), 159; https://doi.org/10.3390/mi11020159
Received: 28 December 2019 / Revised: 27 January 2020 / Accepted: 28 January 2020 / Published: 1 February 2020
(This article belongs to the Section D:Materials and Processing)
Aluminum alloys are widely used, but they are prone to contamination or damage under harsh working environments. In this paper, a self-cleaning superhydrophobic aluminum alloy surface with good corrosion resistance was successfully fabricated via the combination of sand peening and electrochemical oxidation, and it was subsequently covered with a fluoroalkylsilane (FAS) film. The surface morphology, surface wettability, and corrosion resistance were investigated using a scanning electron microscope (SEM), an optical contact angle measurement, and an electrochemical workstation. The results show that binary rough structures and an FAS film with a low surface energy on the Al alloy surfaces confer good superhydrophobicity with a water contact angle of 167.5 ± 1.1° and a sliding angle of 2.5 ± 0.7°. Meanwhile, the potentiodynamic polarization curve shows that the corrosion potential has a positively shifted trend, and the corrosion current density decreases by three orders of magnitude compared with that of the original aluminum alloy sample. In addition, the chemical stability of the as-prepared superhydrophobic surface was evaluated by dripping test using solutions with different pH values for different immersion time. It indicates that the superhydrophobic surface could provide long-term corrosion protection for aluminum alloys. Consequently, the as-prepared superhydrophobic surface has excellent contamination resistance and self-cleaning efficacy, which are important for practical applications. View Full-Text
Keywords: superhydrophobic; sand peening; electrochemical oxidation; aluminum alloy; self-cleaning; corrosion resistance superhydrophobic; sand peening; electrochemical oxidation; aluminum alloy; self-cleaning; corrosion resistance
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MDPI and ACS Style

Dong, X.; Meng, J.; Hu, Y.; Wei, X.; Luan, X.; Zhou, H. Fabrication of Self-Cleaning Superhydrophobic Surfaces with Improved Corrosion Resistance on 6061 Aluminum Alloys. Micromachines 2020, 11, 159.

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