Characterization and Corrosion Properties of polypyrrole Electropolymerized on AZ31 Mg Alloy

The electrochemical synthesis of polypyrrole (PPy) on AZ31 Mg alloy has been successfully achieved in a solution containing of sodium salicylate and pyrrole using cyclic voltammetry. The effect of monomer concentration and different electropolymerization parameters on the PPy morphology and corrosion properties were analyzed in 3.5%NaCl solution. Scanning electron microscopy studies showed typical cauliflower morphology with nano grain size. Open circuit potential measurement and polarization studies revealed that the PPy coated samples show more positive corrosion potential and lower corrosion current density compared to uncoated AZ31 Mg alloy. Electrochemical impedance spectroscopic (EIS) studies of uncoated and PPy coated Mg alloy in 3.5% NaCl solution showed improvement in the corrosion resistance of PPy coated AZ31 Mg alloy

کلیدواژه ها:

polypyrrole ، AZ31 Mg alloy ، cyclic voltammetry ، electropolymerization ، corrosion resistance