Corrosion behaviour of AZ31B magnesium alloy in NaCl solutions saturated with CO_2

摘要

Corrosion behaviour of AZ31B magnesium alloy in different concentrations of NaCl solution saturated with CO_2 was studied by electrochemical techniques, Fourier transform infrared spectroscopy, scanning electron microscopy and energy dispersive X-ray. The corrosion rate increases with increasing NaCl concentration both in the presence and absence of CO_2. The corrosion rate in NaCl solution saturated with CO_2 is bigger than that in single NaCl solution. The inhibitive effect of CO_2 is also observed with immersion time increased in NaCl solution saturated with CO_2, showing that CO_2 reduces the average corrosion rate due to the formation of insoluble products.