Abstract
Al films and TiO2 films were separately coated on AZ31 magnesium alloy substrates by means of magnetron sputtering method. The surface properties of the samples were explored and compared. Scanning electron microscope (SEM) observed the compact structure characteristics of as-deposited Al films and TiO2 films. After heat treatment under 200oC for half an hour the films kept the compact structure characteristics and there didn’t exist structural defects on the surface of the films. Nano-indentation measurement results display that the micro-hardness of as-deposited Al film and TiO2 film reaches about 1.90 Gpa and 1.51 Gpa, separately. Al film is a bit harder than TiO2 film. Finally, the corrosion experiments in simulated body fluid initially indicate the different corrosion properties for Al film and TiO2 film. Al film presents more effective anti-corrosion properties than TiO2 film.
Highlights
For several decades, as excellent light metal and structural materials, magnesium alloys have been widely used in industrial fields such as transportation, building, electronic products, etc[1,2,3,4,5,6,7,8]
During the process of magnetron sputtering, the dried AZ31 chips were fixed onto the sample holder in the cavity of the JGP 450 magnetron sputtering equipment, which was manufactured by SKY Technology Development Co., Ltd, Chinese Academy of Sciences
Based on the above results and discussions, it could be concluded that the degradation properties of magnesium alloys could be adjusted by using proper coating layer, which is vital to clinical application
Summary
As excellent light metal and structural materials, magnesium alloys have been widely used in industrial fields such as transportation, building, electronic products, etc[1,2,3,4,5,6,7,8]. Due to high hardness and non-toxic properties, TiN film is considered as a competitive coating layer for surface modification on magnesium alloy[11,12]. Many studies on structural and mechanical properties of Al film and TiN film coated on magnesium alloys were reported[4,16,17]. Considering the biocompatibility of the coating materials in the filed of medical application, TiO2 film might be a desirable choice for the modification of magnesium alloy[18]. Before using as biomedical materials, the degradation mechanism of the coating layers on magnesium alloys should be explored. The deposition of Al films and TiO2 films on AZ31 magnesium alloy substrates by means of magnetron sputtering was reported.
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