Title: Effect of Anodizing Parameters on Corrosion Resistance of Coated Purified Magnesium,
Abstract: Magnesium and its alloys are being considered for biodegradable biomaterials.
However, high and uncontrollable corrosion rates have limited the use of
magnesium and its alloys in biological environments. In this research, high
purified magnesium (HP-Mg) was coated with stearic acid in order to improve the
corrosion resistance of magnesium. Anodization and immersion in stearic acid
were used to form a hydrophobic layer on magnesium substrate. Different DC
voltages, times, electrolytes, and temperatures were tested. Electrochemical
impedance spectroscopy and potentiodynamic polarization were used to measure
the corrosion rates of the coated HP-Mg. The results showed that optimum
corrosion resistance occurred for specimens anodized at +4 volts for 4 minutes
at 70°C in borate benzoate. The corrosion resistance was temporarily
enhanced by 1000x.