Corrosion behaviour of AZ31B magnesium alloy in NaCl solutions saturated with CO2

Corrosion behaviour of AZ31B magnesium alloy in different concentrations of NaCl solution saturated with CO2 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 CO2. The corrosion rate in NaCl solution saturated with CO2 is bigger than that in single NaCl solution. The inhibitive effect of CO2 is also observed with immersion time increased in NaCl solution saturated with CO2, showing that CO2 reduces the average corrosion rate due to the formation of insoluble products.

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► Corrosion behaviour of AZ31B in NaCl solution saturated with CO2 was studied.
► Corrosion rate increased with increasing NaCl concentration with and without CO2.
► Corrosion rate in NaCl solution with CO2 was bigger than in single NaCl solution.
► Inhibitive effect of CO2 was observed after 8 h immersion in NaCl solution with CO2.