Controlling corrosion kinetics of magnesium alloys by electrochemical anodization and investigation of film mechanical properties
By Rahman, Zia Ur; Deen, K. M.; Haider, Waseem
Published in Applied Surface Science
2019
Abstract
The rapid corrosion of magnesium alloys in physiological environment constraints its applications to employ it as a biodegradable implant material. AZ31 and ZK60 alloys were executed to anodization in alkaline solution as a function of time and investigated their electrochemical and mechanical properties. The scanning electron microscopy reveals the compact passive film formation subsequently to anodization. The high-resolution spectra of x-ray photoelectron spectroscopy confirmed the existence of MgO, Mg(OH)2 and traces of CO3?2 within the anodized layer. The quasi-static with displacement-controlled mode of indentation was performed to investigate the mechanical properties of the anodized films. Anodized ZK60 has an average hardness of 0.49 GPa, greater than the hardness of anodized AZ31-Ano (0.35 GPa). Similarly, the stiffness and film elastic modulus for anodized ZK60 were higher when compared with anodized AZ31. The surface roughness of anodized ZK60 (473.54
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