Anticorrosion Performance of Super-Hydrophobic Complex Film of Graphene/stearic Acid on AZ91 Mg-alloy

doi:10.11901/1005.3093.2016.617

Chinese Journal of Materials Research

2017, Vol. 31

Issue (10): 751-757 DOI: 10.11901/1005.3093.2016.617

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Anticorrosion Performance of Super-Hydrophobic Complex Film of Graphene/stearic Acid on AZ91 Mg-alloy

Ningning CHEN, Yanhua WANG(

), Lian ZHONG, Peipei YANG, Jia WANG

Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China

Cite this article:

Ningning CHEN, Yanhua WANG, Lian ZHONG, Peipei YANG, Jia WANG. Anticorrosion Performance of Super-Hydrophobic Complex Film of Graphene/stearic Acid on AZ91 Mg-alloy. Chinese Journal of Materials Research, 2017, 31(10): 751-757.

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Abstract

A super-hydrophobic complex film was prepared on AZ91 Mg-alloy by a two-step process, i.e. first micro-arc oxidizing (MAO) and then applying blended mixture of graphene/stearic acid (G/SA). The surface wettability, morphology and chemical composition of the super-hydrophobic film were characterized by contact angle measurement, scanning electron microscope and FT-IR spectrometer. After applying the G/SA composite, the hydrophilic porous surface of MAO layer could be transformed into a super-hydrophobic one with static contact angle of 162°. In comparison with the bare Mg-alloy, the corrosion current density decreased and the electrochemical impedance increased by four orders of magnitude for the AZ91 alloy with the super-hydrophobic complex film. The high corrosion resistance can be attributed to the high insulation of the MAO film and the blocking effect of graphene.

Key words: materials failure and protection magnesium alloy micro-arc oxidation complex film super-hydrophobic corrosion behavior

Received: 19 December 2016

ZTFLH:

TG174

Fund: Supported by National Natural Science Foundation of China (Nos.51131005 & 40906039), Promotive Research Fund for Excellent Young and Middle-aged Scientisits of Shandong Province (No.BS2012HZ021)

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	Ningning CHEN
	Yanhua WANG
	Lian ZHONG
	Peipei YANG
	Jia WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.617 OR https://www.cjmr.org/EN/Y2017/V31/I10/751

Fig.1 SEM images and contact angles of MAO layer (a), SA composite film (b) and G/SA composite film (c and d)

Fig.2 FT-IR spectra of SA film and G/SA film

Fig.3 Potentiodynamic polarization curves of samples in 3.5%NaCl solution

Table 1 Results of potentiodynamic polarization tests of samples in 3.5%NaCl solution

Fig.4 Nyquist images of samples in 3.5%NaCl solution

Fig.5 Equivalent circuits of bare AZ91 substrate (a), MAO layer (b), SA composite coatings and G/SA composite coatings (c)

Fig.6 Bode images of samples in 3.5%NaCl solution

Fig.7 Photographs of samples before and after 168 h immersion in 3.5%NaCl solution: (a) bare AZ91 substrate; (b) MAO layer; (c) superhydrophobic composite film

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