Journal
APPLIED SURFACE SCIENCE
Volume 311, Issue -, Pages 864-869Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2014.05.186
Keywords
Superhydrophobicity; Aluminum coating; Suspension flame spray; Corrosion resistance; Polyurethane-alumina coating
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Funding
- China Postdoctoral Science Foundation [2014M551777]
- National Natural Science Foundation of China [31271017, Y30308YM15]
- 100 Talents Program of Chinese Academy of Sciences
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This study aims to further enhance the anti-corrosion performances of Al coatings by constructing superhydrophobic surfaces. The Al coatings were initially arc-sprayed onto steel substrates, followed by deposition of polyurethane (PU)/nano-Al2O3 composites by a suspension flame spraying process. Large-scale corrosion-resistant superhydrophobic PU/nano-Al2O3-Al coatings were successfully fabricated. The coatings showed tunable superhydrophilicity/superhydrophobicity as achieved by changing the concentration of PU in the starting suspension. The layer containing 2.0 wt.%PU displayed excellent hydrophobicity with the contact angle of similar to 151 degrees and the sliding angle of similar to 6.5 degrees for water droplets. The constructed superhydrophobic coatings showed markedly improved anti-corrosion performances as assessed by electrochemical corrosion testing carried out in 3.5 wt.% NaCl solution. The PU/nano-Al2O3-Al coatings with superhydrophobicity and competitive anti-corrosion performances could be potentially used as protective layers for marine infrastructures. This study presents a promising approach for fabricatiing superhydrophobic coatings for corrosion-resistant applications. (C) 2014 Elsevier B.V. All rights reserved.
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