Naslov
Complexities of Corrosion Behaviour of Copper-Nickel Alloys under Liquid Impingement Conditions in Saline Water

Autori
Metikoš-Huković, Mirjana ; Škugor, Ivana ; Grubač, Zoran ; Babić, Ranko

Izvornik
Electrochimica acta (0013-4686) 55 (2010), 9; 3123-3129

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
copper-nickel alloys; flow assisted corrosion; jet impingement; semiconducting oxide film; impedance spectroscopy

Sažetak
Flow-assisted electrochemical corrosion of Cu-Ni disc electrodes, subjected to a submerged impinging jet in saline water, was evaluated and quantified using the anodic current densities (ja), corrosion potentials (Ecorr), interfacial capacitances (C) and polarization resistances (Rp). The Reynolds numbers in the range of applied impinging velocities suggested that the flow between the solution and the electrode is turbulent in the systems investigated. The role of Ni content in the resistance of spontaneously formed barrier oxide film and diethyldithiocarbamate inhibitor film on Cu-Ni alloys (10, 20, 30 and 40 at. % Ni) was examined and evaluated using electrochemical impedance spectroscopy in dependence of the impinging velocity and the immersion time. The results are discussed in terms of the corrosion mechanisms and their relevance to the use of Cu-Ni alloys in desalination plants and in the marine engineering field because fluid hydrodynamics plays an important role in Cu-Ni alloys application. Based on the analysis presented in the paper, it is anticipated that the Cu-10Ni alloy is the best choice for application in the marine environment.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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