Electrochemical Behavior of Magnesium Alloys as Biodegradable Materials in Phosphate Buffer Saline Solution

The electrochemical behavior of extruded AZ31E and AZ91E alloys was investigated in Phosphate Buffer Saline (PBS) Solution of pH 7.4 at 37 C. The behavior of the two alloys was studied with immersion time by using electrochemical impedance spectroscopy (EIS). Polarization measurements are carried out to study the corrosion rate. It was found that the corrosion resistance of AZ91E alloy is higher than that of AZ31E using EIS tests and this is confirmed by polarization tests. Also, the effect of adding 10-3 M concentration of 2-thiouracil and L-tyrosine as inhibitor in PBS solution for AZ91E alloy was studied. The corrosion was inhibited by addition of L-tyrosine more than 2-thiouracil.