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Influence of hydrostatic pressure on corrosion behavior of superhydrophobic surfaces on bare and oxidized aluminum substrates junfei ou, xinzuo fang, wenjie zhao, sheng lei, mingshan xue, fajun wang, changuqna li, yalin lu, and Wen li Langmuir, Just Accepted Manuscript • DOI: 10.1021/acs.langmuir.8b01100 • Publication Date (Web): 25 Apr 2018 Downloaded from http://pubs.acs.org on April 26, 2018
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Langmuir
Influence of hydrostatic pressure on corrosion behavior of superhydrophobic surfaces on bare and oxidized aluminum substrates J. F. Oua,*, X. Z. Fanga, W. J. Zhaob, S. Leia, M. S. Xue a, F. J. Wanga, C. Q. Lia, Y. L. Lua, W. Lia,* a b
School of Materials and Engineering, Jiangsu University of Technology, Changzhou 213001, P. R. China
Key Laboratory of Marine Materials and Related Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Science, Ningbo 315201, P. R. China *
Correspondence authors. Email:
[email protected] Abstract: It is generally recognized that superhydrophobic surfaces into water may be used for the corrosion resistance due to the entrapped air in the solid / liquid interface and could be found potential applications in the protection of ship hull. For a superhydrophobic surface, as its immersion depth into water increases, the resultant hydrostatic pressure is also increased, and the entrapped air can be squeezed out much more easily. It is therefore predicted that high hydrostatic pressure would cause an unexpected decrease in corrosion resistance for the vessels in deep water (e.g., submarines) because of the unstable entrapped air. In this work, in order to clarify the role of hydrostatic pressure in the corrosion behavior of superhydrophobic surfaces, two typical superhydrophobic surfaces (SHSs) were prepared on bare and oxidized aluminum substrates, respectively, and then were immersed into the NaCl aqueous solutions with different depths of ~0 cm (hydrostatic pressure ~0 kPa), 10 cm (1 kPa), and 150 cm (15 kPa). It was found out for the SHSs on the oxidized Al, as the hydrostatic pressure increased, the corrosion behavior became severe. However, for the SHSs on the bare Al, their corrosion behavior was complex due to hydrostatic pressure. It was found that the corrosion resistance under 1 kPa was the highest. Further mechanism analysis revealed that this alleviated corrosion behavior under 1 kPa resulted from suppressing the oxygen diffusion through the liquid and reducing the subsequent corrosion rate as compared with 0 kPa, whereas the relatively low HP could stabilize the entrapped air and hence enhance the corrosion resistance, compared with 15 kPa. The present study therefore provided a fundamental 1
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understanding for the applications of SHSs to prevent the corrosion, especially, for various vessels into deep water. Keywords: entrapped air; hydrostatic pressure; oxygen depolarization corrosion
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Introduction The lotus-inspired superhydrophobic surface (SHS) has attracted lots of attention due to its special static and dynamic wettability, viz., the high water contact angle (>150°) and low sliding angle (
