Please use this identifier to cite or link to this item:
Title: Copper corrosion in mildly alkaline water with the disinfectant monochloramine
Authors: Zhang, X.
Pehkonen, S.O. 
Kocherginsky, N. 
Andrew Ellis, G.
Keywords: Copper
Electrochemical impedance spectroscopy (EIS)
Polarization resistance (Rp)
Issue Date: Nov-2002
Citation: Zhang, X., Pehkonen, S.O., Kocherginsky, N., Andrew Ellis, G. (2002-11). Copper corrosion in mildly alkaline water with the disinfectant monochloramine. Corrosion Science 44 (11) : 2507-2528. ScholarBank@NUS Repository.
Abstract: The corrosion of pure copper for a period of 2-30 days was investigated in simulated tap water containing monochloramine (normally at 4.0 mg/1) in the pH range of 7.6-8.4, using electrochemical impedance spectroscopy, potentiodynamic scan, X-ray photoelectron spectroscopy (XPS), inductively coupled plasma and scanning electronic microscopy (SEM). The XPS spectra and SEM indicated that after 8 days of immersion, the copper surface was covered by both cupric and cuprous oxides. Diffusion in the oxide film was found having a significant effect on the corrosion process. The results showed that at pH 8.0 the polarization resistance (Rp) increased with time during the first 6 days and reached relative stability after 8 days. An equivalent circuit model was proposed to fit the corrosion process, and the elements extracted from the model predicted a corrosion rate in the order of 0.1 μm/yr at pH of 8.0. The values of Rp increased with higher pH for all 2, 4, 6, and 8-day immersions, but decreased at a higher monochloramine concentration of 20 mg/l. In the control experiment, Rp had the largest value after a 30-day immersion time. Dissolved inorganic carbon (DIC) enhancess the dissolution of copper by a factor of 2, when the concentration of DIC increased from 0.59 to 4.0 mM. Increasing ionic strength from 0.005 to 0.02 M reduced Rp, but the increase of Rp with immersion time was faster at higher ionic strengths. © 2002 Elsevier Science Ltd. All rights reserved.
Source Title: Corrosion Science
ISSN: 0010938X
DOI: 10.1016/S0010-938X(02)00021-5
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Jul 3, 2020


checked on Jul 3, 2020

Page view(s)

checked on Jun 28, 2020

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.