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Electrochemical behavior of biocompatible AZ31 magnesium alloy in simulated body fluid

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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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Acknowledgements

The authors, Chengyun Ning and Yuanjun Guo, gratefully acknowledge the financial support of the National Basic Research Program of China (2012CB619100) and the National Natural Science Foundation of China (grant no. 51072057). The study was partially supported by NSF grant (award no. 0723244) to Jing Zhang, and the UAF Graduate School Fellowship to Yanhong Gu.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Purdue School of Engineering and Technology, Indiana University - Purdue University Indianapolis, Indianapolis, IN, 46202, USA

    Jing Zhang

  2. Department of Mechanical Engineering, University of Alaska Fairbanks, Fairbanks, AK, 99775, USA

    Yanhong Gu

  3. College of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, People’s Republic of China

    Yuanjun Guo & Chengyun Ning

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  1. Jing Zhang
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  2. Yanhong Gu
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  3. Yuanjun Guo
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  4. Chengyun Ning
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Correspondence to Chengyun Ning.

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Zhang, J., Gu, Y., Guo, Y. et al. Electrochemical behavior of biocompatible AZ31 magnesium alloy in simulated body fluid. J Mater Sci 47, 5197–5204 (2012). https://doi.org/10.1007/s10853-012-6403-5

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  • DOI: https://doi.org/10.1007/s10853-012-6403-5

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