Influence of Zeolite Coating on the Corrosion Resistance of AZ91D Magnesium Alloy

P Chakraborty Banerjee; Ren Ping Woo; Sam Matthew Grayson; Amrita Majumder; R K Singh Raman

doi:10.3390/ma7086092

Influence of Zeolite Coating on the Corrosion Resistance of AZ91D Magnesium Alloy

Materials (Basel). 2014 Aug 22;7(8):6092-6104. doi: 10.3390/ma7086092.

Authors

P Chakraborty Banerjee¹, Ren Ping Woo², Sam Matthew Grayson³, Amrita Majumder⁴, R K Singh Raman^{5

6}

Affiliations

¹ Departments of Mechanical and Aerospace Engineering, Monash University, Melbourne, VIC 3800, Australia. parama.banerjee@monash.edu.
² Department of Chemical Engineering, Monash University, Melbourne, VIC 3800, Australia. rpwoo1@student.monash.edu.
³ Department of Chemical Engineering, Monash University, Melbourne, VIC 3800, Australia. smgra10@student.monash.edu.
⁴ Department of Chemical Engineering, Monash University, Melbourne, VIC 3800, Australia. amrita.majumder@monash.edu.
⁵ Departments of Mechanical and Aerospace Engineering, Monash University, Melbourne, VIC 3800, Australia. raman.singh@monash.edu.
⁶ Department of Chemical Engineering, Monash University, Melbourne, VIC 3800, Australia. raman.singh@monash.edu.

Abstract

The protective performance of zeolite coating on AZ91D magnesium alloy was evaluated using potentiodynamic polarisation and electrochemical impedance spectroscopy (EIS) in 0.1 M sodium chloride solution (NaCl). Electrical equivalent circuit (EEC) was developed based upon hypothetical corrosion mechanisms and simulated to correspond to the experimental data. The morphology and the chemical nature of the coating were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis. Post corrosion morphologies of the zeolite coated and the uncoated AZ91D alloy were investigated using SEM. The corrosion resistance of the zeolite coated specimen was at least one order of magnitude higher than the uncoated specimen.

Keywords: AZ91; corrosion; electrochemical impedance spectroscopy; magnesium alloys; zeolite coating.