Corrosion resistance of a superhydrophobic surface on micro-arc oxidation coated Mg-Li-Ca alloy

CORC > 金属研究所 > 中国科学院金属研究所

	Corrosion resistance of a superhydrophobic surface on micro-arc oxidation coated Mg-Li-Ca alloy
	Zhang, C. L.; Zhang, F.; Song, L.; Zeng, R. C.; Li, S. Q.; Han, E. H.; Zhang, F; Song, L (reprint author), Shandong Univ Sci & Technol, Coll Mat Sci & Engn, Qingdao 266590, Peoples R China.
刊名	ELSEVIER SCIENCE SA
	2017-12-25
卷号	728 页码:815-826
关键词	Magnesium Alloy Micro-arc Oxidation Superhydrophobicity Corrosion Resistance
ISSN号	0925-8388
英文摘要	A superhydrophobic surface was successfully fabricated on micro-arc oxidation (MAO) coating on Mg-1Li- 1Ca magnesium alloy via surface modification with stearic acid (SA). The microstructure, composition and superhydrophobic characteristics of the MAO/SA composite coatings were investigated by means of SEM, EDS, XRD, XPS, FT-IR, and contact angle (CA). The corrosion resistance of the coatings was assessed by potentiodynamic polarization, electrochemical impedance spectrum (EIS), and immersion test in 3.5 wt % NaCl solution. The results demonstrated that the morphology of the porous MAO surface was transformed to a novel petal-like clusters after modified with SA. The magnesium stearate and SA were deposited in/on the micro-pores and the surface of the MAO coating. The CA of the SA-modified surface reached 155.5 degrees. The corrosion current density of the MAO/SA-7h coating decreased about three orders of the magnitude compared to the substrate. The SA-modified surface can provide a long-term corrosion protection for the Mg-1Li-1Ca alloy. Additionally, the coating formation mechanism as well as the corrosion mechanism were proposed and discussed. (C) 2017 Elsevier B.V. All rights reserved.; A superhydrophobic surface was successfully fabricated on micro-arc oxidation (MAO) coating on Mg-1Li- 1Ca magnesium alloy via surface modification with stearic acid (SA). The microstructure, composition and superhydrophobic characteristics of the MAO/SA composite coatings were investigated by means of SEM, EDS, XRD, XPS, FT-IR, and contact angle (CA). The corrosion resistance of the coatings was assessed by potentiodynamic polarization, electrochemical impedance spectrum (EIS), and immersion test in 3.5 wt % NaCl solution. The results demonstrated that the morphology of the porous MAO surface was transformed to a novel petal-like clusters after modified with SA. The magnesium stearate and SA were deposited in/on the micro-pores and the surface of the MAO coating. The CA of the SA-modified surface reached 155.5 degrees. The corrosion current density of the MAO/SA-7h coating decreased about three orders of the magnitude compared to the substrate. The SA-modified surface can provide a long-term corrosion protection for the Mg-1Li-1Ca alloy. Additionally, the coating formation mechanism as well as the corrosion mechanism were proposed and discussed. (C) 2017 Elsevier B.V. All rights reserved.
学科主题	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
资助机构	National Natural Science Foundation of China [51601108, 51571134, 21676285]; Natural Science Foundation of Shandong Province [2016ZRB01A62]; Qingdao Indigenous Innovation Program [15-9-1-76-jch]; SDUST Research Fund [2014TDJH104]
公开日期	2018-01-10
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/78927]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhang, F; Song, L (reprint author), Shandong Univ Sci & Technol, Coll Mat Sci & Engn, Qingdao 266590, Peoples R China.
推荐引用方式 GB/T 7714	Zhang, C. L.,Zhang, F.,Song, L.,et al. Corrosion resistance of a superhydrophobic surface on micro-arc oxidation coated Mg-Li-Ca alloy[J]. ELSEVIER SCIENCE SA,2017,728:815-826.
APA	Zhang, C. L..,Zhang, F..,Song, L..,Zeng, R. C..,Li, S. Q..,...&Song, L .(2017).Corrosion resistance of a superhydrophobic surface on micro-arc oxidation coated Mg-Li-Ca alloy.ELSEVIER SCIENCE SA,728,815-826.
MLA	Zhang, C. L.,et al."Corrosion resistance of a superhydrophobic surface on micro-arc oxidation coated Mg-Li-Ca alloy".ELSEVIER SCIENCE SA 728(2017):815-826.