Corrosion resistance of Zn-Al layered double hydroxide/poly(lactic acid) composite coating on magnesium alloy AZ31

被引：97
作者：
Zeng, Rong-Chang [1 ,2 ]
Li, Xiao-Ting [1 ,2 ]
Liu, Zhen-Guo [1 ,2 ]
Zhang, Fen [1 ,2 ]
Li, Shuo-Qi [1 ,2 ]
Cui, Hong-Zhi [1 ]
机构：
[1] Shandong Univ Sci & Technol, Coll Mat Sci & Engn, Qingdao 266510, Peoples R China
[2] Shandong Univ Sci & Technol, Shandong Prov & Minist Sci & Technol, State Key Lab Min Disaster Prevent & Control, Qingdao 266590, Peoples R China
来源：
FRONTIERS OF MATERIALS SCIENCE | 2015年 / 9卷 / 04期
关键词：
magnesium; corrosion; layered double hydroxide (LDH); poly(lactic acid) (PLA); ion-exchange; self-healing; HYDROTALCITE CONVERSION FILM; IN-SITU GROWTH; DOUBLE HYDROXIDE; MG ALLOY; CARBONIC-ACID; PROTECTION; CYTOCOMPATIBILITY; ENVIRONMENT; PERFORMANCE; FABRICATION;
D O I：
10.1007/s11706-015-0307-7
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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.
引用
收藏
页码：355 / 365
页数：11
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