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Effect of hydrodynamics on a copper-nickel alloy rotating disc electrode in a marine environment

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Abstract

The impact of hydrodynamic conditions on the electrochemical corrosion behavior of a Cu90–Ni10 alloy in an artificial marine environment and a sulfide-contaminated marine environment in the absence and presence of 5-(3-aminophenyl)tetrazole (APT) is discussed. Electrochemical impedance spectroscopy, potentiodynamic polarization and cyclic voltammetry (CV) and surface analytical techniques, viz., X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), are applied to evaluate the APT performance. Both the Rct and Rfilm values are reduced with an increase in the rotation speed in sulfide-polluted marine water and without APT. Interestingly, in the presence of APT, in the absence and presence of sulfide, both the Rct and Rfilm values are increased enormously. Potentiodynamic polarization studies suggest that APT performs as a mixed inhibitor. XRD and XPS techniques suggest the presence of CuO, Cu2O, CuCl, CuS and Cu2S in seawater and sulfide-contaminated seawater in the absence of APT. However, the above products are completely absent in the presence of APT film.

Graphical abstract: Effect of hydrodynamics on a copper-nickel alloy rotating disc electrode in a marine environment

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Publication details

The article was received on 01 May 2017, accepted on 22 Aug 2017 and first published on 23 Aug 2017


Article type: Paper
DOI: 10.1039/C7NJ01458A
Citation: New J. Chem., 2017, Advance Article
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    Effect of hydrodynamics on a copper-nickel alloy rotating disc electrode in a marine environment

    K. Chaitanya Kumar, B. V. Appa Rao, S. Srinivasa Rao and K. Vimal Kumar, New J. Chem., 2017, Advance Article , DOI: 10.1039/C7NJ01458A

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