Fabrication of Super-hydrophobic Surface on AM60 Mg-alloy and Its Corrosion Resistance

doi:10.11902/1005.4537.2021.088

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (2): 301-308 DOI: 10.11902/1005.4537.2021.088

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Fabrication of Super-hydrophobic Surface on AM60 Mg-alloy and Its Corrosion Resistance

DAI Weili¹^,²(

), WANG Jinghang¹, LUO Shuai¹, DU Ning¹, LIU Fan¹, XU Lidong¹, ZHANG Jun¹, SONG Yuehong¹^,², LIU Yanfeng¹^,²^,³

^1.Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources, Shangluo University, Shangluo 726000, China
^2.Shaanxi Engineering Research Center for Mineral Resources Clean & Efficient Conversion and New Materials, Shangluo University, Shangluo 726000, China
^3.School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China

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Abstract

The hydrophobic surface film on AM60 Mg-alloy was prepared by chemical etching, and then soaking in stearic acid ethanol solution. The microstructure, hydrophobic properties and corrosion resistance of hydrophobic surface were characterized by means of scanning electron microscope, contact angle tester and electrochemical workstation. The results showed that the AM60 Mg-alloy was super hydrophilic after etching with hydrochloric acid. When the etching time was 25 min, the contact angle reached a maximum value, which was 125% higher than that of the untreated surface. With the increase of soaking time in the stearic acid ethanol solution, the contact angle increases first and then decreases. When soaked for 12 h, the contact angle reaches the maximum of 150.18° and the rolling angle is less than 10°. At this time, the hydrophobic film presents a micro/nano rough surface with low-surface energy, which have superior hydrophobic properties. The hydrophobic AM60 Mg-alloy has good corrosion resistance, and its corrosion current density is 88.19% lower than that of untreated matrix material, and the corresponding corrosion voltage is 19.72% higher, which significantly improves the corrosion resistance of the AM60 Mg-alloy. At the same time, the treated AM60 Mg-alloy has also good self-cleaning performance to dust and aqueous solution.

Key words: AM60 Mg-alloy chemical etching super-hydrophobic corrosion resistance self-cleaning

Received: 20 April 2021

ZTFLH:

TG17

Fund: Natural Science Basic Research Program of Shaanxi Province(2019JQ-156);Key Project of Shaanxi Province Education Department Science and Technology(19JS026);Shangluo Science and Technology Innovation Team(SK2019-75);Doctoral Research Program of Shangluo University(17SKY019)

Corresponding Authors: DAI Weili E-mail: dweili@126.com

About author: DAI Weili, E-mail: dweili@126.com

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	Weili DAI
	Jinghang WANG
	Shuai LUO
	Ning DU
	Fan LIU
	Lidong XU
	Jun ZHANG
	Yuehong SONG
	Yanfeng LIU

Cite this article:

DAI Weili, WANG Jinghang, LUO Shuai, DU Ning, LIU Fan, XU Lidong, ZHANG Jun, SONG Yuehong, LIU Yanfeng. Fabrication of Super-hydrophobic Surface on AM60 Mg-alloy and Its Corrosion Resistance. Journal of Chinese Society for Corrosion and protection, 2022, 42(2): 301-308.

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.088 OR https://www.jcscp.org/EN/Y2022/V42/I2/301

Fig.1 XRD patterns of AM60 Mg-alloy before and after surface treatments

Fig.2 Raman spectra of AM60 Mg-alloy with different surface treatments

Fig.3 SEM images and surface contact angles of AM60 Mg-alloy samples without (a) and with surface treatments of etching for 10 min in HCl solution (b); etching for 10 min in HCl solution and then soaking for 12 h in SA ethanol solution (c); soaking for 12 h in SA ethanol solution (d)

Fig.4 Effect of soaking time on surface contact angle

Fig.5 SEM surface images and contact angles of AM60 Mg-alloy samples surfaces etched for 25 min in HCl solution and then soaked in SA ethanol solution for 0 h (a), 6 h (b, c), 12 h (d, e) and 16 h (f, g) (the insets are the magnified images)

Fig.6 Schematic illustration of Cassie model on contact angles of drop on hydrophobic (a) and super hydrophobic (b) surfaces

Fig.7 Polarization curves of AM60 Mg-alloy samples with different surface treatments in 3.5%NaCl solution

Table 1 Corrosion current densities and corrosion voltages of AM60 magnesium alloy samples without and with surface treatments

Fig.8 SEM images of AM60 Mg-alloy without (a) and with (b) surface treatment after soaking in 3.5%NaCl solution (etched for 25 min in HCl solution and then soaked in SA for 12 h)

Fig.9 Photos of self-cleaning effect of M60 Mg-based alloy with hydrophobic surface for powder dust (a, b) and ink (c, d)

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