Corrosion Behaviors of Mg-7Gd-5Y-1Nd-0.5Zr Alloys in CO 2 Atmosphere under Different Relative Humidity

The corrosion behaviors of peak-aged Mg-7Gd-5Y-1Nd-0.5Zr alloys in CO2 atmosphere under different relative humidity were investigated by OM, SEM. The weight loss rates, corrosion morphology and residual mechanical properties were also analyzed. The corrosion rates of specimens in CO2 atmosphere at 70% relative humidity were highest than others. Relevancy of the influence factors included relative humidity and concentration of CO2 were researched. The results show that relative humidity and concentration of CO2 in the environment both played an important role in corrosion behaviors.