| Corrosion resistance of Zn–Al layered double hydroxide/poly(lactic acid) composite coating on magnesium alloy AZ31 |
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| 引用本文： | Rong-Chang ZENG,Xiao-Ting LI,Zhen-Guo LIU,Fen ZHANG,Shuo-Qi LI,Hong-Zhi CUI. Corrosion resistance of Zn–Al layered double hydroxide/poly(lactic acid) composite coating on magnesium alloy AZ31[J]. 材料科学前沿(英文版), 2015, 9(4): 355-365. DOI: 10.1007/s11706-015-0307-7 |
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| 作者姓名： | Rong-Chang ZENG Xiao-Ting LI Zhen-Guo LIU Fen ZHANG Shuo-Qi LI Hong-Zhi CUI |
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| 摘 要： |
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Corrosion resistance of Zn–Al layered double hydroxide/ poly(lactic acid) composite coating on magnesium alloy AZ31 |
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| Rong-Chang Zeng,Xiao-Ting Li,Zhen-Guo Liu,Fen Zhang,Shuo-Qi Li,Hong-Zhi Cui. Corrosion resistance of Zn–Al layered double hydroxide/ poly(lactic acid) composite coating on magnesium alloy AZ31[J]. Frontiers of Materials Science, 2015, 9(4): 355-365. DOI: 10.1007/s11706-015-0307-7 |
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| Authors: | Rong-Chang Zeng Xiao-Ting Li Zhen-Guo Liu Fen Zhang Shuo-Qi Li Hong-Zhi Cui |
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| Affiliation: | 1. College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266510, China2. State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China |
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| Abstract: | A Zn–Al layered double hydroxide (ZnAl-LDH) coating consisted of uniform hexagonal nano-plates was firstly synthesized by co-precipitation and hydrothermal treatment on the AZ31 alloy, and then a poly(lactic acid) (PLA) coating was sealed on the top layer of the ZnAl-LDH coating using vacuum freeze-drying. The characteristics of the ZnAl-LDH/PLA composite coatings were investigated by means of XRD, SEM, FTIR and EDS. The corrosion resistance of the coatings was assessed by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results showed that the ZnAl-LDH coating contained a compact inner layer and a porous outer layer, and the PLA coating with a strong adhesion to the porous outer layer can prolong the service life of the ZnAl-LDH coating. The excellent corrosion resistance of this composite coating can be attributable to its barrier function, ion-exchange and self-healing ability. |
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| Keywords: | magnesium corrosion layered double hydroxide (LDH) poly(lactic acid) (PLA) ion-exchange self-healing |
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