Journal
METALS
Volume 6, Issue 3, Pages -Publisher
MDPI AG
DOI: 10.3390/met6030047
Keywords
zinc stearate (ZnSA); organic-inorganic; anodized aluminum oxide (AAO); superhydrophobic aluminum; micro-nanostructure; electrochemical impedance spectroscopy (EIS); potentiodynamic polarization; corrosion
Funding
- Natural Science and Engineering Research Council of Canada (NSERC)
- Aluminium Research Centre-REGAL
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The formation of low surface energy hybrid organic-inorganic micro-nanostructured zinc stearate electrodeposit transformed the anodic aluminum oxide (AAO) surface to superhydrophobic, having a water contact angle of 160 degrees. The corrosion current densities of the anodized and aluminum alloy surfaces are found to be 200 and 400 nA/cm(2), respectively. In comparison, superhydrophobic anodic aluminum oxide (SHAAO) shows a much lower value of 88 nA/cm(2). Similarly, the charge transfer resistance, R-ct, measured by electrochemical impedance spectroscopy shows that the SHAAO substrate was found to be 200-times larger than the as-received aluminum alloy substrate. These results proved that the superhydrophobic surfaces created on the anodized surface significantly improved the corrosion resistance property of the aluminum alloy.
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