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Article – Journal of Advanced Electrochemistry

Journal of Advanced Electrochemistry, Volume 2,Issue 4,2016 Pages 121-125

Inhibition of Oxadiazole Derivatives for the Control of Corrosion of Copper-Nickel Alloy in Sea Water
K. Chadrasekaran, B.S. Alwar, R. Ravichandran*

Inhibitive action of four oxadiazole derivatives namely 2,5-diphenyl-1,3,4-oxadiazole (DPOX), 2-Amino-5-(4-methoxyphenyl)-1,3,4-oxadiazole(AMOX),2,5-Bis(4-diethylaminophenyl)-1,3,4-oxadiazole(BPOX) and 2,5-Bis-(4-aminophenyl)-1,3,4-oxadiazole (BAOX) on the corrosion of copper-nickel alloy in natural sea water has been studied. Weight loss, potentio-dynamic polarisation measurement and electrochemical impedance spectroscopy (EIS) has been employed to analyse their inhibition behavior of oxadiazole derivatives. Polarization measurements showed that the oxadiazole derivative inhibits the corrosion of copper-nickel alloy by blocking the active sites of the metal surface. Changes in the impedance parameters (charge transfer resistance (Rct) and double layer capacitance (Cdl)) are related to adsorption of organic inhibitors on the metal surface, leading to the formation of a protective film. BAOX showed better protection over the other inhibitor used. The dissolution of copper and nickel in the presence and absence of oxadiazoles was analysed by ICP-AES.

Keywords: Copper-Nickel Alloy; Oxadiazoles; Sea Water; Impedance; Arrhenius Plot;