Journal
RSC ADVANCES
Volume 5, Issue 38, Pages 29639-29646Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra00324e
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Funding
- National Key Scientific Program-Nanoscience and Nanotechnology [2011CB933700]
- National Natural Science Foundation of China [51210008]
- CAS Institute of Physical Science, University of Science and Technology of China [2012FXCX008]
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Superhydrophobic 5052 aluminum alloy substrates with excellent corrosion resistance have been fabricated by a simple and low-cost method of acid treatment and modification of fluoroalkyl-silane combined with surface passivation. Via an etching process with hydrochloric acid, hierarchical convex-concave micro/nano-structures have been formed on 5052 aluminum alloy surfaces. Then they were covered with a flocculent layer after passivation with potassium permanganate. The wettability and corrosion resistance of the as-prepared substrates have been systematically investigated. The results indicate that aluminum alloy substrates with an etching time of 5 min and passivation time of 180 min exhibit good superhydrophobicity with a water contact angle of 153 +/- 0.7 degrees. In addition, corrosion resistance was also explored by potentiodynamic polarization curves and electrochemical impedance spectroscopy. Clearly, the corrosion resistance of the as-prepared aluminum alloy substrates has been greatly enhanced, which will be positive to extend further the applications of Al alloys in engineering fields, such as shipbuilding and oceanographic engineering.
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