Electrochemical Performance Estimation of Anodized AZ31B Magnesium Alloy as Function of Change in the Current Density
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JMEPEG DOI: 10.1007/s11665-017-2808-2
Electrochemical Performance Estimation of Anodized AZ31B Magnesium Alloy as Function of Change in the Current Density L. Giro´n, W. Aperador, L. Tirado, F. Franco, and J.C. Caicedo (Submitted June 14, 2016; in revised form April 26, 2017) The anodized AZ31B magnesium alloys were synthesized via electrodeposition processes. The aim of this work was to determine the electrochemical behavior of magnesium alloys by using anodized alloys as a protective coating. The anodized alloys were characterized by x-ray diffraction, exhibiting the crystallography orientation for Mg and MgO phases. The x-ray photoelectron spectroscopy was used to determine the chemical composition of anodized magnesium alloys. By using electrochemical impedance spectroscopy and Tafel curves, it was possible to estimate the electrochemical behavior of anodized AZ31B magnesium alloys in HankÕs balanced salt solution (HBSS). Scanning electron microscopy was performed to analyze chemical changes and morphological surface changes on anodized Mg alloys due to the reaction in HBSS/ anodized magnesium surface interface. Electrochemical behavior in HBSS indicates that the coatings may be a promising material for biomedical industry. Keywords
AZ31B magnesium alloy, anodization processes, electrochemical impedance spectroscopy (EIS)
1. Introduction Scientific literature has reported that metallic materials, like stainless or titanium alloys, can be used as temporal implants due to high corrosion resistance and biocompatibility. However, these materials in high time of implantation release metallic cations that intoxicate the implanted body, and must be removed in a second surgery (Ref 1). Medicine and materials engineering has focused on developing novel materials with significant applications in the biomedical industry, but some problems of biodegradation have occurred, although some among those biodegradable materials may be removed or resorbed in different processes (e.g., bone regeneration). However, the generation of a large accumulation of the hydrogen bubbles in gas pockets adjacent to the metal implant (magnesium) and the rapid corrosion are the major impediments in using them as an implant material; this necessitates the study of surface modification methods for generating and evaluating a protective coat in the base material as a potential answer (Ref 2). Therefore, magnesium anodization presents an alternative solution to prevent severe corrosion phenomena in physiological medium, due to that anodizing processes can
L. Giro´n and J.C. Caicedo, Tribology, Powder Metallurgy and Processing of Solid Recycling Research Group, Universidad del Valle, Cali, Colombia; W. Aperador, Department of Engineering, Universidad Militar Nueva Granada, Bogota´, Colombia; L. Tirado, Laboratorio de Optoelectro´nica, Universidad del Quindı´o, Armenia, Colombia; and F. Franco, Grupo de Materiales Compuestos, Universidad del Valle, Cali, Colombia. Contact e-mails: [email protected] and [email protected].
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