Please use this identifier to cite or link to this item:
|Title:||Corrosion Mechanisms and Products of Copper in Aqueous Solutions at Various pH Values||Authors:||Feng, Y.
Scanning electron microscopy
X-ray photoelectron spectroscopy
|Issue Date:||1997||Citation:||Feng, Y.,Siow, K.-S.,Teo, W.-K.,Tan, K.-L.,Hsieh, A.-K. (1997). Corrosion Mechanisms and Products of Copper in Aqueous Solutions at Various pH Values. Corrosion 53 (5) : 389-398. ScholarBank@NUS Repository.||Abstract:||The corrosion behavior of copper in aqueous solutions of different pH values was investigated using electrochemical and surface analysis methods. It was shown that the corrosion mechanism changed with pH and was associated with morphology of the surface films formed. In solution of pH 3, the copper surface was covered with porous corrosion products of cuprous oxide (Cu2O). Corrosion was controlled predominately by diffusion in solution. In solutions of pH 4 to pH 5, formation of cubic Cu2O on the copper surface provided a diffusion barrier to copper dissolution. The anodic process was controlled by a mixed diffusion of copper ions in oxide films and in solution. In solutions of pH 6 to pH 9, the oxide films (Cu2O) became more protective. Diffusion in the oxide films became a rate-determining step of anodic dissolution. In pH 10 solution, a thin, compact Cu2O film formed, and spontaneous passivation was observed. At pH 12 and pH 13, analysis by x-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) demonstrated that the copper surface was covered mainly with a protective monoclinic cupric oxide (CuO) layer. Alternating current impedance measurement results suggested the corrosion process possibly was controlled by diffusion in the oxide films.||Source Title:||Corrosion||URI:||http://scholarbank.nus.edu.sg/handle/10635/91428||ISSN:||00109312|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Sep 7, 2019
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.