Zinc modified polypyrrole coating on mild steel

Polypyrrole (PPy) films (∼1.7 μm thick) have been electrodeposited on mild steel (MS) substrates from 0.1 M pyrrole containing aqueous oxalic acid solution, by using cyclic voltammetry technique. Then, the polymer coatings were modified with deposition of zinc particles (∼1 mg/cm2), at a constant po...

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Bibliographic Details
Published in:Surface & coatings technology 2006-12, Vol.201 (6), p.2782-2790
Main Author: TUKEN, Tune
Format: Article
Language:English
Subjects:
ac impedance
Applied sciences
Corrosion
Corrosion environments
Exact sciences and technology
Metals. Metallurgy
Polypyrrole
Zinc deposition
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Summary:Polypyrrole (PPy) films (∼1.7 μm thick) have been electrodeposited on mild steel (MS) substrates from 0.1 M pyrrole containing aqueous oxalic acid solution, by using cyclic voltammetry technique. Then, the polymer coatings were modified with deposition of zinc particles (∼1 mg/cm2), at a constant potential value of −1.20 V in 0.2 M ZnSO4 solution. The corrosion performance of zinc modified PPy coating has been investigated in 3.5% NaCl solution, by using electrochemical impedance spectroscopy and anodic polarisation curves. Also, the corrosion behaviours of zinc modified PPy coated platinum and single PPy coated MS samples have been investigated, for comparison. It was shown that zinc modified coating exhibited very low permeability and provided important cathodic protection to MS for considerably long immersion period. The voluminous zinc corrosion products are formed during exposure time in aggressive solution, giving rise to a blocking effect on the porous structure and led to effective barrier behaviour of zinc modified PPy coating, even after 96 h of exposure time to corrosive solution.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2006.05.017