Influence of pH and chloride concentration on the corrosion behavior of unalloyed copper in NaCl solution : a comparative study between the micro and macro scales
- Author
- Farzin Arjmand Gholenji (UGent) and Mieke Adriaens (UGent)
- Organization
- Abstract
- The effects of pH and chloride concentration on the electrochemical corrosion of copper in aqueous sodium chloride (NaCl) media were studied at the micro scale using a microcapillary droplet cell and at the macro scale using a conventional large scale cell. Using an experimental design strategy, electrochemical response surface models of copper versus pH and NaCl concentration were constructed with the minimum number of experiments required. Results show that the electrochemical behavior of copper under corrosive media shows significant differences between the micro and macro scale experiments. At the micro scale, the pit initiation of copper occurs at more negative potentials for high NaCl concentrations and alkaline pH values. Also, the micro scale potentiostatic measurements indicate higher stabilised passive currents at high NaCl concentrations and low (acidic) pH values. At the macro scale, the pH is shown to have a greater influence on the corrosion potential. The chloride concentration is the most significant factor in the passive current case while at the micro scale the effect of these two factors on the passive current was found to be the same. The surface morphology of the formed patina on the corroded copper in both micro and macro systems reveal a more significant role of the chloride concentration on the structure and the grain size of the patinas. Finally, micro and macro electrochemical impedance spectroscopy of copper at various NaCl concentrations and pH values demonstrates a different behavior of copper after several potentiodynamic polarization cycles.
- Keywords
- polarization, copper, EIS, pitting corrosion, experimental design, ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY, SQUARE-WAVE VOLTAMMETRY, PIPELINE STEEL, METAL-COMPLEXES, CAPILLARY CELL, ELECTRODISSOLUTION, MICROELECTRODES, ELECTRODES, SEAWATER, LABILITY
Downloads
-
MaterialsArjmand2012.pdf
- full text
- |
- open access
- |
- |
- 2.83 MB
Citation
Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-3097358
- MLA
- Arjmand Gholenji, Farzin, and Mieke Adriaens. “Influence of PH and Chloride Concentration on the Corrosion Behavior of Unalloyed Copper in NaCl Solution : A Comparative Study between the Micro and Macro Scales.” MATERIALS, vol. 5, no. 12, 2012, pp. 2439–64, doi:10.3390/ma5122439.
- APA
- Arjmand Gholenji, F., & Adriaens, M. (2012). Influence of pH and chloride concentration on the corrosion behavior of unalloyed copper in NaCl solution : a comparative study between the micro and macro scales. MATERIALS, 5(12), 2439–2464. https://doi.org/10.3390/ma5122439
- Chicago author-date
- Arjmand Gholenji, Farzin, and Mieke Adriaens. 2012. “Influence of PH and Chloride Concentration on the Corrosion Behavior of Unalloyed Copper in NaCl Solution : A Comparative Study between the Micro and Macro Scales.” MATERIALS 5 (12): 2439–64. https://doi.org/10.3390/ma5122439.
- Chicago author-date (all authors)
- Arjmand Gholenji, Farzin, and Mieke Adriaens. 2012. “Influence of PH and Chloride Concentration on the Corrosion Behavior of Unalloyed Copper in NaCl Solution : A Comparative Study between the Micro and Macro Scales.” MATERIALS 5 (12): 2439–2464. doi:10.3390/ma5122439.
- Vancouver
- 1.Arjmand Gholenji F, Adriaens M. Influence of pH and chloride concentration on the corrosion behavior of unalloyed copper in NaCl solution : a comparative study between the micro and macro scales. MATERIALS. 2012;5(12):2439–64.
- IEEE
- [1]F. Arjmand Gholenji and M. Adriaens, “Influence of pH and chloride concentration on the corrosion behavior of unalloyed copper in NaCl solution : a comparative study between the micro and macro scales,” MATERIALS, vol. 5, no. 12, pp. 2439–2464, 2012.
@article{3097358, abstract = {{The effects of pH and chloride concentration on the electrochemical corrosion of copper in aqueous sodium chloride (NaCl) media were studied at the micro scale using a microcapillary droplet cell and at the macro scale using a conventional large scale cell. Using an experimental design strategy, electrochemical response surface models of copper versus pH and NaCl concentration were constructed with the minimum number of experiments required. Results show that the electrochemical behavior of copper under corrosive media shows significant differences between the micro and macro scale experiments. At the micro scale, the pit initiation of copper occurs at more negative potentials for high NaCl concentrations and alkaline pH values. Also, the micro scale potentiostatic measurements indicate higher stabilised passive currents at high NaCl concentrations and low (acidic) pH values. At the macro scale, the pH is shown to have a greater influence on the corrosion potential. The chloride concentration is the most significant factor in the passive current case while at the micro scale the effect of these two factors on the passive current was found to be the same. The surface morphology of the formed patina on the corroded copper in both micro and macro systems reveal a more significant role of the chloride concentration on the structure and the grain size of the patinas. Finally, micro and macro electrochemical impedance spectroscopy of copper at various NaCl concentrations and pH values demonstrates a different behavior of copper after several potentiodynamic polarization cycles.}}, author = {{Arjmand Gholenji, Farzin and Adriaens, Mieke}}, issn = {{1996-1944}}, journal = {{MATERIALS}}, keywords = {{polarization,copper,EIS,pitting corrosion,experimental design,ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY,SQUARE-WAVE VOLTAMMETRY,PIPELINE STEEL,METAL-COMPLEXES,CAPILLARY CELL,ELECTRODISSOLUTION,MICROELECTRODES,ELECTRODES,SEAWATER,LABILITY}}, language = {{eng}}, number = {{12}}, pages = {{2439--2464}}, title = {{Influence of pH and chloride concentration on the corrosion behavior of unalloyed copper in NaCl solution : a comparative study between the micro and macro scales}}, url = {{http://doi.org/10.3390/ma5122439}}, volume = {{5}}, year = {{2012}}, }
- Altmetric
- View in Altmetric
- Web of Science
- Times cited: