Publication details

Authors: Xue, D. C.; Tan, Z. Q.; Schulz, M. J.; Vanooij, W. J.; Sankar, J.; Yun, Y. H.; Dong, Z. Y. 
Title: Corrosion studies of modified organosilane coated magnesium-yttrium alloy in different environments 
Type: Journal Article 
Publisher: Materials Science & Engineering C-Materials for Biological Applications 
Year: 2012 
Volume: 32 
Start Page: 1230 
End Page: 1236 
DOI: 10.1016/j.msec.2012.03.013 
Abstract: Magnesium (Mg) and its alloys have numerous potential applications as biodegradable implants, but the fast degradation rate of Mg alloys at the initial implanted stage could be a problem. This paper describes the modification of the water-based bis-[triethoxysilyl] ethane (BTSE) silane applied to the surface of magnesium-yttrium (Mg-4Y) to increase its corrosion resistance. Surface characterization by SEM. FTIR, and EDX showed that the hydrolysis and condensation of the silane resulted in a covalent bonding to the Mg-4Y surface. Corrosion behavior of the uncoated and coated Mg-4Y alloy was evaluated in different environments by using a novel self-developed corrosion probe. Based on the electrochemical results of DC polarization and electrochemical impedance spectroscopy (EIS), we conclude that the epoxy-modified BTSE silane coating successfully increases the corrosion resistance at the initial stage of implantation. The corrosion rates in the flesh of dead mice environments such as body cavity and subcutaneous tissue of the mice were lower than the corrosion rates in in vitro environments. (C) 2012 Elsevier B.V. All rights reserved. 
Keywords: biodegradable magnesium, corrosion, subcutaneous, toxicity, tetrasulfide silane films, sodium-chloride solution, simulated body-fluid, in-vivo corrosion, galvanized steel, cell-culture, aa 2024-t3, rare-earth, protection, implants