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题名: Corrosion resistance of a superhydrophobic surface on micro-arc oxidation coated Mg-Li-Ca alloy
作者: Zhang, C. L.;  Zhang, F.;  Song, L.;  Zeng, R. C.;  Li, S. Q.;  Han, E. H.
发表日期: 2017-12-25
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.
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Recommended Citation:
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.

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