Journal
APPLIED SURFACE SCIENCE
Volume 467, Issue -, Pages 1046-1052Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.10.218
Keywords
Corrosion resistance; Aluminum corrosion resistance; Superhydrophobic aluminum surface; Superhydrophilic aluminum surface; Hydrophobic aluminum surface; Wetting morphologies
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Funding
- Basic Research Laboratory Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2016R1A4A1012950]
- Korea Research Institute of Ships & Ocean Engineering (KRISO) [PES9320]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Ministry of Trade, Industry Energy (MOTIE) [20153030091420]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20153030091420] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Korea Institute of Marine Science & Technology Promotion (KIMST) [PES9320] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [22A20130012138] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We investigated the improved corrosion resistance of micro/nanostructured aluminum surfaces by varying wetting morphologies. By combining the wet-chemical oxidation schemes and low surface energy coating, we induced three different wetting morphologies including superhydrophilic, Cassie-mode superhydrophobic and Wenzel-mode hydrophobic on micro/nanostructured aluminum surfaces. The superhydrophilic oxide layers provided approximately 30-76% improvement in the corrosion resistance compared to untreated ones. When a hydrophobic coating was added to the oxide layers and Cassie-mode superhydrophobicity was induced, all types of samples showed over 95% increase in the corrosion resistance compared with untreated ones. When the air trapped on the superhydrophobic surfaces was removed in a vacuum environment, the corrosion resistance decreased but still provided 70-98% increase compared with untreated ones. The present work showed that the superhydrophobic treatment is a very effective way to improve the corrosion resistance but the proper choice of the passivation layer and hydrophobic coating can provide a meaningful increase in the corrosion resistance. The present work further clarified the high corrosion resistance of superhydrophobic aluminum surfaces and will help to develop practical anti-corrosion resistance surfaces.
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