Electrochemical behavior of biocompatible AZ31 magnesium alloy in simulated body fluid |
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| Authors: | Jing Zhang Yanhong Gu Yuanjun Guo Chengyun Ning |
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| Affiliation: | (1) Department of Mechanical Engineering, Purdue School of Engineering and Technology, Indiana University - Purdue University Indianapolis, Indianapolis, IN 46202, USA;(2) Department of Mechanical Engineering, University of Alaska Fairbanks, Fairbanks, AK 99775, USA;(3) College of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, People’s Republic of China; |
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| Abstract: | Dense oxidation coatings have been successfully developed on biocompatible AZ31 magnesium alloy, using microarc oxidation
technique, to improve the corrosion resistance. Three different deposition voltages of 250, 300, and 350 V have been employed.
The effect of voltage on the coating corrosion resistance has been evaluated through electrochemical experiments in a simulated
body fluid (SBF) up to 7 days. Potentiodynamic polarization and electrochemical impedance spectroscopy scans were performed
in the SBF solution, followed by optical microscopy surface inspection. The results indicate that the corrosion rates of the
coatings are in the order of 250 < 300 < 350 V after immersion for 7 days, and the charge transfer resistance (R
ct) of the three samples is in the order of 250 > 300 > 350 V. Both the electrochemical tests and the surface inspection suggest
that the 250 V coating has the highest corrosion resistance, with lowest corrosion current density, highest R
ct, and the best surface quality. |
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