中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 25 No. 12 December 2015 |
（1. College of Materials Science and Engineering, Shandong University of Science and Technology,
Qingdao 266590, China;
2. 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;
3. College of Chemical and Environmental Engineering, Shandong University of Science and Technology,
Qingdao 266590, China）
Abstract:To enhance the corrosion resistance of magnesium (Mg) alloy and to impart its surface with antibacterial functionality for inhibiting biofilm formation and biocorrosion, Mg(OH)2 films were fabricated on AZ31 magnesium alloy substrates by an in-situ hydrothermal method and well-defined multilayer coatings, consisting of gentamicin sulfate (GS) and poly(sodium 4-styrene sulfonate) (PSS), were prepared via layer-by-layer (LbL) assembly. The morphologies, chemical compositions and corrosion resistance of the obtained (PSS/GS)n/Mg sample were investigated using scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, electrochemical methods and immersion tests. Finally, the bactericidal activity of (PSS/GS)n/Mg samples against Staphylococcus aureus was assessed by the zone of inhibition methods and plate-counting method. The so-synthesized composite coating on the Mg alloy substrates exhibits good corrosion resistance and antibacterial performance, which make them attractive as coatings for medical implanted devices.
Key words: magnesium alloy; corrosion resistance; antibacterial property; layer-by-layer assembly
