Characteristic and corrosion studies of rare earth (REE) based anodizing on AZ91D magnesium alloy
Date
2014-01Author
Khalid Azadi, Mat Akhir
Mohd Zamzuri, Mohammad Zain
Mohd Nazree, Derman, Dr.
Siti Norbahiyah, Mohamad Badari
Metadata
Show full item recordAbstract
Oxide coatings on AZ91D magnesium alloy were prepared using anodizing technique with 10mA/cm2 current density for 5 minutes in electrolyte containing Mg (NO₃)₂ with NaVO₃ as an additive. The corrosion behaviors of different coatings condition were evaluated by immersion test in 5.0% NaCl electrolyte for 72 hours. The microstructures were analyzed by Optical Microscope (OM) and Scanning Electron Microscope (SEM). It was found that coatings with the addition of NaVO₃ produced homogeneous primary α-matrix and bigger β-phase (Mg₁₇Al₁₂) compared to untreated AZ91D magnesium alloy. The oxide film formed by anodizing in electrolyte with NaVO₃ enhances the corrosion resistance of the AZ91D magnesium alloy significantly.