A kinetic model for the dissolution mechanism of copper in acidic sulfate solutions

Danny K.Y. Wong, Bruce A.W. Coller, Douglas R. MacFarlane

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Steady-state polarization curves and impedance data have been obtained for the electrochemical dissolution copper in 1.0 M Na2SO4 solutions at pH 1, 2, 3, 4 and 5. The steady-state polarization curves display only active dissolution in the potential range investigated (from the open circuit potential up to + 100mV vs. sce) and exhibit a Tafel range of 54.8-55.6mV. Two time constants, over a wide spectrum of frequencies (10-3-10-4Hz), have been observed in all complex impedance plots. The experimental results have been quantitatively fitted by a reaction mechanism model which provides an excellent fit to the steady state data and is in qualitative agreement with the impedance data.

Original languageEnglish
Pages (from-to)2121-2127
Number of pages7
JournalElectrochimica Acta
Issue number14
Publication statusPublished - 1 Jan 1993


  • acidic sulfate solutions
  • copper dissolution
  • impedance electrochemistry
  • kinetic and mechanism
  • rotating copper electrode

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