Effects of Sucrose on Anodized Film Formed on AZ31B Magnesium Alloy in Environmental-Friendly Electrolyte

An environmental-friendly electrolyte, which contained an addition of sucrose, was used to prepare an anodized film on AZ31B magnesium alloy under the constant current density of 1 A/dm(2) at room temperature. Effects of sucrose on the properties of anodized film were characterized by scanning electron microscopy (SEM), energy dispersion spectrometry (EDS), X-ray diffraction (XRD), potentiodynamic polarization and electrochemical impedance spectroscopy (EIS), respectively. The results show that the anodized film formed in the electrolyte with addition of 10g/L sucrose has superior uniform surface and higher corrosion resistance than that obtained in other conditions.