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Received March 30, 2007
Accepted December 19, 2007
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Poly(o-anisidine) on brass: Synthesis and corrosion behavior
Arts and Science Faculty, Department of Chemistry, The University of Mustafa Kemal, 31040, Turkey 1Arts and Science Faculty, Department of Physic, The University of Middle East Technical, 06531, Turkey
Korean Journal of Chemical Engineering, July 2008, 25(4), 846-853(8), 10.1007/s11814-008-0140-0
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Abstract
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.
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References
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Pourbaix, Atlas of electrochemical equilibria in aqueous solutions, NACE, Houston, Texas (1966)
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Mansfeld F, J. Appl. Electrochem., 25(3), 187 (1995)
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