TY - GEN
T1 - BIOACTIVITY AND CORROSION BEHAVIOR OF MAGNESIUM ALLOYS TREATED BY PLASMA ELECTROLYTIC OXIDATION
AU - Jin, Fanya
AU - Liu, Xiangmei
AU - Chu, Paul K.
AU - Xu, Guidong
AU - Shen, Liru
AU - Tong, Honghui
PY - 2006/6
Y1 - 2006/6
N2 - As a lightweight and nontoxic metal with mechanical properties similar to those of natural bones, magnesium based materials have attracted much interest in biomedical engineering. As the materials are both bio compatible and biodegradable, they can be used in many orthopedic and load-bearing applications. However, the poor corrosion resistance of magnesium-based biomedical implants in a physiological environment has hampered their use as substitutes for human hard tissues. Recently, plasma electrolytic oxidation (PEO) that is derived from anodic oxidation technology has been applied to treat valve-metals such as Al, Mg, Ti and their alloys. By utilizing micro-arc plasma discharges sustained at a high voltage in aqueous solutions, various oxide films can be formed on these metals to improve their surface properties such as wear and corrosion resistance as well as bio activity. In this work, PEO treatments are conducted on magnesium alloys in different electrolytes and different voltage modes. The corrosion resistance is determined in simulated body fluids (SBF) based on the potentiodynamic polarization curves, and the surface bio activity is investigated by monitoring the apatite inducing capability. The structure and chemistry of the plasma-formed surface oxide which exhibits a porous structure are evaluated. Our results show that the corrosion resistance and bio activity of the PEO Mg alloys are much improved.
AB - As a lightweight and nontoxic metal with mechanical properties similar to those of natural bones, magnesium based materials have attracted much interest in biomedical engineering. As the materials are both bio compatible and biodegradable, they can be used in many orthopedic and load-bearing applications. However, the poor corrosion resistance of magnesium-based biomedical implants in a physiological environment has hampered their use as substitutes for human hard tissues. Recently, plasma electrolytic oxidation (PEO) that is derived from anodic oxidation technology has been applied to treat valve-metals such as Al, Mg, Ti and their alloys. By utilizing micro-arc plasma discharges sustained at a high voltage in aqueous solutions, various oxide films can be formed on these metals to improve their surface properties such as wear and corrosion resistance as well as bio activity. In this work, PEO treatments are conducted on magnesium alloys in different electrolytes and different voltage modes. The corrosion resistance is determined in simulated body fluids (SBF) based on the potentiodynamic polarization curves, and the surface bio activity is investigated by monitoring the apatite inducing capability. The structure and chemistry of the plasma-formed surface oxide which exhibits a porous structure are evaluated. Our results show that the corrosion resistance and bio activity of the PEO Mg alloys are much improved.
UR - http://www.cityu.edu.hk/phy/appkchu/plasma/Paul%20Chu/paul_chu.htm
U2 - 10.1109/PLASMA.2006.1707207
DO - 10.1109/PLASMA.2006.1707207
M3 - RGC 32 - Refereed conference paper (with host publication)
SN - 1-4244-0125-9
T3 - IEEE Conference Record - Abstracts
SP - 336
BT - The 33rd IEEE International Conference on Plasma Science, ICOPS 2006
PB - IEEE
T2 - 33rd IEEE International Conference on Plasma Science (ICOPS 2006)
Y2 - 4 June 2006 through 8 June 2006
ER -