Preparation of Superhydrophobic Surface on Copper Substrate and Its Corrosion Resistance

doi:10.11902/1005.4537.2020.256

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (1): 93-98 DOI: 10.11902/1005.4537.2020.256

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Preparation of Superhydrophobic Surface on Copper Substrate and Its Corrosion Resistance

YIN Xubao, LI Yuqiao, GAO Rongjie(

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School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China

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Abstract

A super-hydrophobic surface is constructed on the Cu substrate by chemical etching, high-temperature oxidation and then modifying with 1-Dodecanethiol as hydrophobic agent, in order to improve the corrosion resistance of the Cu substrate. The results show that when chemical etching for 8 min, high temperature oxidation for 6 h, and 1-Dodecanethiol modification for 15 min, a net-like layered structure with sufficient roughness can form on the Cu surface, which can capture a large amount of air. At this time, the surface of the Cu substrate has the best hydrophobicity with a contact angle of 165.50° for water. The measured potentiodynamic polarization curve shows that in comparison with the bare Cu, the corrosion rate of the superhydrophobic surface is significantly reduced, and the corrosion current density drops from 7.43×10^-5 A·cm^-2 to 4.31×10^-6 A·cm^-2. The results of electrochemical impedance spectroscopy showed that the charge transfer resistance of the superhydrophobic surface was significantly higher than that of the bare Cu substrate, indicating that its corrosion resistance was obviously improved due to the presence of the superhydrophobic surface film. Compared with the current methods for preparing superhydrophobic surfaces, this method is cheaper, simpler and environmentally friendly.

Key words: chemical etching high-temperature oxidation 1-Dodecanethiol superhydrophobic surface anti-corrosion

Received: 08 December 2020

ZTFLH:

TG174.4

Fund: National Natural Science Foundation of China-Shandong Province Joint Fund(U1706221)

Corresponding Authors: GAO Rongjie E-mail: dmh206@ouc.edu.cn

About author: GAO Rongjie, E-mail: dmh206@ouc.edu.cn

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Cite this article:

YIN Xubao, LI Yuqiao, GAO Rongjie. Preparation of Superhydrophobic Surface on Copper Substrate and Its Corrosion Resistance. Journal of Chinese Society for Corrosion and protection, 2022, 42(1): 93-98.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.256 OR https://www.jcscp.org/EN/Y2022/V42/I1/93

Fig.1 SEM surface images of Cu samples after chemical etching for 8 min (a), then oxidation at 160 ℃ for 6 h (b), finally 1-Dodecanethiol modification for 10 min (c), 15 min (d), 24 min (e) and 40 min (f)

Fig.2 XRD patterns of blank and superhydrophobic surfaces of copper

Fig.3 EDS spectrum of sample surface modified by 1-Dodecanethiol

Fig.4 Infrared spectra of superhydrophobic surface and 1-Dodecanethiol

Fig.5 Change of contact angle of water drop on the surface of the sample modified by 1-Dodecanethiol for different time

Fig.6 Photos showing contact angle (a) and rolling (b) of water drop on the superhydrophobic surface

Fig.7 Potential polarization curves of blank, 1-Dodecanethiol unmodified and modified copper samples

Table 1 Fitting parameters of potential polarization curves

Fig.8 Nyquist plot of blank, 1-Dodecanethiol unmodified and modified copper samples

Table 2 Electrochemical model parameters obtained by fitting Nyquist plot in Fig.8

Fig.9 Equivalent circuit models of EIS of Cu samples with blank surface (a) and superhydrophobic surface (b)

Fig.10 Nyquist plots of superhydrohobic specimen after immersion in 3.5%NaCl solution for different time

Table 3 Electrochemical model parameters obtained by fitting Nyquist plot in Fig.10

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