Robust and Chemically Stable Superhydrophobic Aluminum-Alloy Surface with Enhanced Corrosion-Resistance Properties
We report a simple method for fabricating micro-nanoscale structures consisting of irregular microscale plateaus with a self-assembled network of zinc oxide nanopetals on an aluminum alloy substrate. The method involves a combination of chemical etching with a hydrothermal process, followed by Polydimethylsiloxane coating via a simple vapor deposition method. Following the coating, surface displays superhydrophobicity with water contact angle of 161° and a sliding angle of 4°. The effect of morphological changes on wettability is examined by varying the hydrothermal processing time. The chemical stability of the superhydrophobic surfaces is examined in a wide range of corrosive media. After being immersed in a 3.5 wt% NaCl solution for 1 month, the surface retained its superhydrophobicity. The potentiodynamic polarization test results reveal that the superhydrophobic surface highly improves the corrosion resistance performance of the bare aluminum surface by three orders of magnitude. In addition, surface exhibited good mechanical durability against sandpaper abrasion, and long-term stability in the ambient environment. The proposed fabrication technique operating at relatively low temperature is simple and provides a new approach for production of large-scale three-dimensional superhydrophobic surfaces for various applications.
KeywordsSuperhydrophobic Al alloy ZnO Micro-nano Anti-corrosion Durability
This research was supported by the National Research Foundation (NRF) funded by the Ministry of Science, Republic of Korea (Grant number: 2016R1A2B3015530).
- 7.Lee, C., & Kim, C. (2011). Underwater restoration and retention of gases on superhydrophobic surfaces for drag reduction. Journal of Physical Review Letters, 106, 0145021–0145024.Google Scholar
- 22.Boinovich, L. B., Emelyanenko, A. M., Modestov, A. D., Domantovsky, A. G., & Emelyanenko, K. A. (2015). Synergistic effect of superhydrophobicity and oxidized layers on corrosion resistance of aluminum alloy surface textured by nanosecond laser treatment. ACS Applied Materials & Interfaces, 7, 19500–19508.CrossRefGoogle Scholar
- 24.Suh, Y. D., Hong, S. J., Kim, G. H., Hwang, K. I., Choi, J. H., et al. (2016). Selective electro-thermal growth of zinc oxide nanowire on photolithographically patterned electrode for microsensor applications. International Journal of Precision Engineering and Manufacturing, 3(2), 173–177.CrossRefGoogle Scholar
- 35.Liang, J., Hu, Y., Wu, Y., & Chen, H. (2013). Fabrication and corrosion resistance of superhydrophobic hydroxide zinc carbonate film on aluminum substrates. Journal of Nanomaterials, 2013, 139768 (6 pages).Google Scholar