Journal
FRONTIERS OF MATERIALS SCIENCE
Volume 9, Issue 4, Pages 355-365Publisher
HIGHER EDUCATION PRESS
DOI: 10.1007/s11706-015-0307-7
Keywords
magnesium; corrosion; layered double hydroxide (LDH); poly(lactic acid) (PLA); ion-exchange; self-healing
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Funding
- Scientific Research Foundation of Shandong for Outstanding Young Scientist [BS2013CL009]
- Doctoral Program Foundation of State Education Ministry [20133718120003]
- Applied Basic Research Foundation of Qingdao [13-1-4-217-jch]
- SDUST Research Fund [2014TDJH104]
- Joint Innovative Centre for Safe and Effective Mining Technology and Equipment of Coal Resources, Shandong Province
- Taishan Scholarship Project of Shandong Province [TS20110828]
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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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