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Lotus-Inspired Multiscale Superhydrophobic AA5083 Resisting Surface Contamination and Marine Corrosion Attack

1,2,3,*, 1,2,3, 1,2,3, 1,2,4 and 1,2,3,*
1
CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, No.7 Nanhai Road, Qingdao 266071, China
2
Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology (Qingdao), No.1 Wenhai Road, Qingdao 266237, China
3
Center for Ocean Mega-Science, Chinese Academy of Sciences, No.7 Nanhai Road, Qingdao 266071, China
4
School of Civil Engineering, Qingdao University of Technology, No. 11 Fushun Road, Qingdao 266033, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(10), 1592; https://doi.org/10.3390/ma12101592
Received: 22 April 2019 / Revised: 9 May 2019 / Accepted: 11 May 2019 / Published: 15 May 2019
(This article belongs to the Special Issue Advanced Coatings for Corrosion Protection)
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Abstract

The massive and long-term service of 5083 aluminum alloy (AA5083) is restricted by several shortcomings in marine and industrial environments, such as proneness to localized corrosion attack, surface contamination, etc. Herein, we report a facile and cost-effective strategy to transform intrinsic hydrophilicity into water-repellent superhydrophobicity, combining fluorine-free chemisorption of a hydrophobic agent with etching texture. Dual-scale hierarchical structure, surface height relief and surface chemical elements were studied by field emission scanning electron microscopy (FE-SEM), atomic force microscopy (AFM), energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS), successively. Detailed investigations of the wetting property, self-cleaning effect, NaCl-particle self-propelling, corrosion and long-term behavior of the consequent superhydrophobic AA5083 surface were carried out, demonstrating extremely low adhesivity and outstanding water-repellent, self-cleaning and corrosion-resisting performance with long-term stability. We believe that the low cost, scalable and fluorine-free transforming of metallic surface wettability into waterproof superhydrophobicity is a possible strategy towards anti-contamination and marine anti-corrosion. View Full-Text
Keywords: fluorine free; silanization; superhydrophobic; corrosion protection; self-cleaning fluorine free; silanization; superhydrophobic; corrosion protection; self-cleaning
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Zhang, B.; Xu, W.; Zhu, Q.; Yuan, S.; Li, Y. Lotus-Inspired Multiscale Superhydrophobic AA5083 Resisting Surface Contamination and Marine Corrosion Attack. Materials 2019, 12, 1592.

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