Preparation of Superamphiphobic Surface on Al-alloy and Its Corrosion Resistance

doi:10.11902/1005.4537.2021.339

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (6): 966-972 DOI: 10.11902/1005.4537.2021.339

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Preparation of Superamphiphobic Surface on Al-alloy and Its Corrosion Resistance

LI Yuqiao, SI Weiting, GAO Rongjie(

)

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

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LI Yuqiao, SI Weiting, GAO Rongjie. Preparation of Superamphiphobic Surface on Al-alloy and Its Corrosion Resistance. Journal of Chinese Society for Corrosion and protection, 2022, 42(6): 966-972.

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Abstract

Superamphiphobic surface film was prepared on 5083 Al-alloy substrate by using chemical etching and then finishing in an ethanol solution of perfluorodecyl triethoxysilane. Its microscopic morphology, chemical composition, superamphiphobicity and corrosion resistance were characterized by means of field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), contact angle measurements and electrochemical tests. The results showed that the contact angles of water and ethylene glycol on the surface were 158° and 154.3°, respectively, exhibiting good superamphiphobicity. In comparison with the bare alloy, the free corrosion potential of the 5083 Al-alloy with superamphiphobic surface film exhibited significantly positive shift, while the corrosion current decreased from 4.016×10^-6 A·cm^-2 to 1.531×10^-7 A·cm^-2; after immersing in 3.5% (mass fraction) NaCl solution for 5 d, the charge transfer resistance of the alloy with superamphiphobic surface film was still significantly higher than that of the bare alloy, it follows that the superamphiphobic surface finishing can enhance the corrosion resistance of 5083 Al-alloy substrate.

Key words: Al-alloy chemical etching superamphiphobic surface anti-corrosion

Received: 26 November 2021

ZTFLH:

TG174.4

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

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

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.339 OR https://www.jcscp.org/EN/Y2022/V42/I6/966

Fig.1 Process for the preparation of the superamphiphobic surface

Fig.2 SEM surfaces images of bare sample (a), etching and modifying sample (b), etching, athing and modifying sample (c, d)

Fig.3 Optical images of water droplets on the surface of different samples (a) and the optical images of ethylene glycol on the surface of different samples (b)

Fig.4 XRD pattern of the samples with different treatments

Fig.5 XPS spectra of the sample before fluorosilane modification (a) and peaks of O 1s (a) and Al 2p (b)

Fig.6 XPS spectra of the sample after fluorosilane modification (a) and peaks of C 1s (b), O 1s (c) and Si 2p (d)

Fig.7 Potential polarization curves of bare and superamphiphobic samples

Table 1 Fitting parameters of potential polarization curves

Fig.8 Nyquist plots of bare sample and the superamphiphobic sample with different immersing times

Fig.9 Equivalent circuit models of EIS of bare sample (a) and superamphiphobic sample (b)

Table 2 Electrochemical model parameters obtained by fitting Nyquist Plots of bare sample and superamphiphobic sample immersed for different times in Fig.8

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