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

✍ Scribed by Danny K.Y. Wong; Bruce A.W. Coller; Douglas R. MacFarlane

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 735 KB
• Volume: 38
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(93)80350-9

✦ Synopsis

Steady-state polarization curves and impedance data have been obtained for the electrochemical dissolution of copper in 1.0 M Na,SO, solutions at pH 1, 2, $4 and 5. The steady-state polarization curves display only active dissolution in the potential range investigated (from the open circuit potential up to + 1OOmV vs. see) and exhibit a Tafel range of 54.&55.6mV. Two time constants, over a wide spectrum of frequencies (10-3-1@H~), have been observed in all complex impedance plots. The experimental results have heen 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.