Corrosion Resistance of Mg-4Zn Alloy with Amorphous Micro-Arc Oxidation Coating in Simulated Body Fluid

Abstract:

A binary Mg-4Zn alloy was fabricated as a potential degradable biomaterial. To improve the corrosion resistance of Mg-4Zn alloy, an amorphous micro-arc oxidation (MAO) coating was prepared on the Mg-4Zn substrate. Electrochemical measurements and immersion tests were employed to evaluate the corrosion resistance of the specimen in simulated body fluid (SBF). Electrochemical measurements show that the Mg-4Zn alloy covered with a MAO coating has a much lower corrosion current density and a much greater polarization resistance. Immersion tests suggest that the degradation of Mg-4Zn substrate is relatively serious during the initial 8 h of immersion although it has been protected by a MAO coating. When most micro-pores within the MAO coating have been filled with precipitates resulted from the corrosion of the metal substrate, the degradation of the Mg-4Zn substrate is significantly delayed.

• Periodical: Materials Science Forum (Volume 852)
• Pages: 1325-1333
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.852.1325
• Online since: April 2016
• Authors: Li Chen Zhao, Shuang Jin Liu, Yu Min Qi, Chun Xiang Cui
• Keywords: Corrosion Resistance, Degradable Material, Magnesium Alloy, Micro-Arc Oxidization (MAO)

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