Abstract
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°. The corrosion current densities of the anodized and aluminum alloy surfaces are found to be 200 and 400 nA/cm2, respectively. In comparison, superhydrophobic anodic aluminum oxide (SHAAO) shows a much lower value of 88 nA/cm2. Similarly, the charge transfer resistance, Rct, 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.
Highlights
Aluminum (Al) and its alloys are naturally-abundant engineering materials with extensive applications in daily life
We have described the method to prepare the superhydrophobic surfaces on anodic aluminum oxide (AAO) by the electrodeposition process and describe their corrosion resistance properties, both using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS)
SEM images in of 1 reveal the100 evolution differentdistance morphologies as-received an average diameter approximately nm and of anthe inter‐pore of ~137of: nm(a) arethe observed on the aluminum alloy surface; (b) the anodized (AAO)
Summary
Aluminum (Al) and its alloys are naturally-abundant engineering materials with extensive applications in daily life. Nanoporous anodic aluminum oxide (AAO) prepared by electrochemical anodization has found a multitude of applications, such as catalysis [1], drug delivery [2], biosensing [3], template synthesis [4], molecular and ion separation [5], corrosion resistance [6], and so forth. The formation of AAO on the aluminum alloy surface would act as the corrosion barrier. It is necessary to transform the AAO to be superhydrophobic in order to improve the corrosion resistance properties. In the last few decades, a large effort has been devoted to the realization of superhydrophobic surfaces, due to their applications in biology [8], anti-corrosion [9,10,11,12], anti-icing [13], self-cleaning [14], etc
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