Please use this identifier to cite or link to this item:
|Title:||The corrosion behaviour of copper in neutral tap water. Part I: Corrosion mechanisms|
|Citation:||Feng, Y., Teo, W.-K., Siow, K.-S., Tan, K.-L., Hsieh, A.-K. (1996-03). The corrosion behaviour of copper in neutral tap water. Part I: Corrosion mechanisms. Corrosion Science 38 (3) : 369-385. ScholarBank@NUS Repository. https://doi.org/10.1016/0010-938X(96)00110-2|
|Abstract:||The corrosion behaviour of copper in neutral aerated simulated tap water is investigated using electrochemical methods and XPS. Semi-infinite diffusion behaviour is found in electrochemical impedance spectroscopy (EIS) from intermediate to low frequency. Polarization resistance (Rp) obtained at very low frequency (0.0005 Hz) increases with immersion time, which coincides with the growth of oxide film on copper. The growth of oxide film with immersion time has little effect on the cathodic process, but considerably reduces the anodic dissolution current. The observed results suggest that the diffusion of copper ions in oxide film controls the overall corrosion rate. Under rotating conditions polarization resistance decreases and anodic current increases, which was caused by the decrease of the oxide film thickness. The phenomena of the mixed diffusion of copper ion in oxide film and in solution has been observed at a low pH of 5. Passivation is found when pH = 10. XPS spectra show that the oxide film formed is composed mainly of cuprous oxide. An equivalent circuit representing the corroding interface is proposed with a discussion of theoretical approaches to the calculation of diffusion impedance and polarization resistance.|
|Source Title:||Corrosion Science|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Sep 20, 2018
WEB OF SCIENCETM
checked on Sep 10, 2018
checked on Jul 6, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.