Improvement in the protective performance and adhesion of polypyrrole coating on AZ31 Mg alloys

The electrochemical synthesis of polypyrrole(Ppy) coating on AZ31 magnesium alloy was successfully achieved in a solution containing sodium salicylate and monomer of pyrrole through cyclic voltammetry technique.The effect of potential range,passivation pretreatment and number of cycles of polymeriza...

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Bibliographic Details
Published in:Progress in natural science 2015-10, Vol.25 (5), p.478-485
Main Authors: Hatami, Maryam, Saremi, Mohsen, Naderi, Reza
Format: Article
Language:English
Subjects:
AZ31 Mg
Corrosion protection
Cyclic voltammetry
Electropolymerization
Mg
Cyclic
PolyPyrrole
PolyPyrrole
AZ31
protection
voltammetry
Electropolymerization
Corrosion
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Summary:The electrochemical synthesis of polypyrrole(Ppy) coating on AZ31 magnesium alloy was successfully achieved in a solution containing sodium salicylate and monomer of pyrrole through cyclic voltammetry technique.The effect of potential range,passivation pretreatment and number of cycles of polymerization on the quality and protective performance of the coatings was evaluated using surface analysis and electrochemical techniques.Through taking the advantage of charge transfer resistance,current density,corrosion potential,optical microscopy images and SEM micrographs,the optimum condition of synthesis of a Ppy coating with the best adhesion and corrosion protection was determined.The optimal PPy coating synthesized over AZ31 increases the polarization resistance and decreases the corrosion current more than one order of magnitude and shift the corrosion potential about 200 mV toward nobler potentials.The SEM studies showed that Ppy coating have cauliflower morphology of Ppy grains with a diameter ranging from 20 nm to 60 nm.
ISSN:1002-0071
DOI:10.1016/j.pnsc.2015.10.001