Degradation behaviour of pure magnesium in simulated body fluids with different concentrations of [formula omitted

Abstract

Corrosion behaviour of pure magnesium in simulated body fluids (SBF) with HCO 3 − concentrations of 4, 15 and 27 m mol/L is studied. Magnesium is not sensitive to pitting corrosion in all the SBFs. Higher HCO 3 − concentration effectively slow down the corrosion rates. Uniform and compact corrosion product layer preferentially forms in SBF with HCO 3 − of 27 m mol/L. Potentiodynamic polarization test indicates that HCO 3 − of 27 m mol/L dramatically enhance corrosion potential and induce passivation. EIS results further confirm that higher concentration of HCO 3 − induce more effective protection layer, especially in SBF with HCO 3 − of 27 m mol/L.