Acta Metallurgica Sinica (English Letters)

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Self-Assembled Silane Film and Silver Nanoparticles Coating on Magnesium Alloys for Corrosion Resistance and Antibacterial Applications

Rongchang ZENG1), Lijun LIU1), Shuoqi LI1), Yuhong ZOU2), Fen ZHANG1), Yanan YANG2), Hongzhi CUI1), En-hou HAN3)   

  1. 1) College of Material Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
    2) College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China
    3) State Key laboratory for Corrosion and Protection, Institute of Metals Research, Chinese Academy of Sciences, Shenyang 110016, China
  • Received:2013-07-13 Revised:2013-08-24 Online:2013-12-25 Published:2014-02-28
  • Contact: Rongchang ZENG
  • Supported by:

    National Natural Science Foundation of China (No. 51241001), NSF of Shandong Province (No. ZR2011EMM004), the open foundation of State Key Laboratory for Corrosion and Protection (No. SKLCP21012KF03), Taishan Scholarship Project of Shandong Province (No. TS20110828) and the Basic Research Project of Qingdao Science and Technology Program (No. 13-1-4-171-jch).

Abstract:

Contamination resulting from microbial adhesion on magnesium alloys is very common in many applications. Self-assembly technology was employed to prepare an antibacterial composite coating by fixing silver nanoparticles (AgNPs) onto the surface of magnesium alloys. The AgNPs were immobilized on the surface of 3-aminopropyltrimethoxysilane (APTMS)-modified magnesium alloy AZ31 (APTMS/Mg) through electrostatic inter-attraction between partially protonated amino groups and negatively charged citrate-capped AgNPs, resulting in the AgNPs attached APTMS/Mg (AgNPs/APTMS/Mg) substrate. The prepared Ag colloid and functionalized AZ31 alloy were characterized by ultraviolet-visible (UV-vis) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and electrochemical methods. Finally, the bactericidal activity of AgNPs/APTMS/Mg substrate against Escherichia coli was assessed by the inhibition zone. The results demonstrated that Si-O-Si covalent bonds existed on the substrate with the formation of inorganic Si-O-Mg bonds. AgNPs were immobilized and well-dispersed, forming a uniform submonolayer on the silane film in two dimensions. The AgNPs/APTMS-pretreated AZ31 alloys exhibited better corrosion resistance and excellent antibacterial performance.

Key words: Magnesium alloy, Nanoparticles, Self-assembly, Corrosion, Antibacterial effect