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Issue
Korean Journal of Chemical Engineering,
Vol.25, No.4, 846-853, 2008
Poly(o-anisidine) on brass: Synthesis and corrosion behavior
Ozyilmaz AT, Ozyilmaz G, Yilmaz E, Colak N
The electrochemical synthesis of poly(o-anisidine) (POA) was achieved on brass (CuZn) electrode by applying two scan rates (50 and 20 mVs.1). The synthesized polymer films were strongly adherent and homogeneous in both cases. Their corrosion performance was investigated by AC impedance spectroscopy (EIS) technique, anodic polarization plots and open circuit potential-time curves, in 3.5% NaCl solution. It was clearly seen that poly(o-anisidine) films provided a significant physical protection for longer exposure time. It was shown that polymer film coated at high scan rate (CuZn/POA-H) exhibited better barrier property against the attack of corrosive agents when compared with polymer film obtained at low scan rate (CuZn/POA-L). It was found out that poly(o-anisidine) film synthesized at high scan rate caused a significant increase in corrosion resistance by its catalytic behavior on formation of protective oxide layers on the surface in longer time.
Keywords: Coatings; Corrosion; Brass; Poly(o-anisidine); AC Impedance
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