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Fabrication and characterization of hydrophobic microarc oxidation/poly-lactic acid duplex coating on biodegradable Mg-Ca alloy for corrosion protection

被引：68
作者：
Bakhsheshi-Rad, H. R. [1 ,2 ]
Hamzah, E. [1 ]
Ebrahimi-Kahrizsangi, R. [2 ]
Daroonparvar, M. [1 ]
Medraj, M. [3 ,4 ]
机构：
[1] Univ Teknol Malaysia, Fac Mech Engn, Dept Mat Mfg & Ind Engn, Johor Baharu 81310, Johor, Malaysia
[2] Islamic Azad Univ, Najafabad Branch, Dept Mat Engn, Adv Mat Res Ctr, Najafabad, Iran
[3] Concordia Univ, Dept Mech Engn, 1455 De Maisonneuve Blvd West, Montreal, PQ H3G 1M8, Canada
[4] Masdar Inst, Mech & Mat Engn, POB 54224, Abu Dhabi, U Arab Emirates
来源：
VACUUM | 2016年 / 125卷
关键词：
Mg-Ca alloy; Microarc oxidation; Hydrophobic properties; Bio-corrosion behavior; PLASMA ELECTROLYTIC OXIDATION; MAGNESIUM ALLOY; COMPOSITE COATINGS; RESISTANCE; MICROSTRUCTURE; DEPOSITION; BEHAVIOR;
D O I：
10.1016/j.vacuum.2015.12.022
中图分类号：
T [工业技术];
学科分类号：
120111 [工业工程];
摘要：
A double layer coating was prepared on biodegradable Mg-Ca alloy by microarc oxidation (MAO) followed by dip coating process. The results showed that hydrophobic poly-lactic acid (PLA) as a top layer with thickness of 37-40 mu m provides significantly higher corrosion resistance in terms of corrosion current and charge transfer resistance, while the MAO coating alone (8-10 mu m) exhibits lower corrosion resistance. However, both coating scenarios demonstrate better corrosion resistance compared with the uncoated Mg- 1.34wt% Ca alloy. Contact angle (CA) measurements showed that the double layer MAO/PLA coated sample presented hydrophobic properties with a CA of 95.30 degrees which is higher than that of MAO coating (CA = 22.90 degrees). The results also exhibit that hydrophobic PLA is effectively seals the porosities of the MAO layer providing effective protection for the biodegradable Mg alloy in the simulated body fluid (SBF) environment and improving the corrosion protection capacity of the MAO surface treatment. (C) 2016 Elsevier Ltd. All rights reserved.
引用
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页码：185 / 188
页数：4
相关论文
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