Journal
CHEMICAL ENGINEERING JOURNAL
Volume 362, Issue -, Pages 638-649Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.01.086
Keywords
Superhydrophobic; Heat dissipation; Plasma electrolytic oxidation; Electrodeposition; Corrosion resistance; Adhesion strength
Categories
Funding
- NSFC [51571077, 51621091, 51771079]
- National Basic Science Research Program [2012CB933900]
- Aviation Science Foundation of China [20163877014]
- Fundamental Research Funds for the Central Universities [201202]
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To enhance the heat dissipation and anti-corrosion performance simultaneously, a superhydrophobic Al2O3/cerium hexadecanoate (Al2O3/CH) composite coating with high adhesion strength has been fabricated by plasma electrolytic oxidation and subsequent electrodeposition. The Al2O3/CH composite coating with a contact angle of 165.5 degrees shows excellent water repelling and self-cleaning ability owing to the micro/nano structure and low surface energy. The composite coating enhances the corrosion potential of pure Al from -0.742 to -0.730 V and lowers the corrosion current density by two orders of magnitude. Thanks to the high emissivity in the wavelength range from 2.5 to 25 mu m, the Al2O3/CH coated sample enables the operation temperature of a 5 W LED to drop approximately by 9.3 degrees C compared with Al substrate. In addition, the Al2O3/CH composite coating exhibits higher adhesion strength than that of the CH single layer. Therefore, the superhydrophobic coating is expected to be a promising candidate for heat dissipation and anti-corrosion applications.
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