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A Pragmatic Study of Corrosion Current Density of Cu Using Potentiodynamic Polarization
Current Issue
Volume 3, 2016
Issue 3 (December)
Pages: 13-16   |   Vol. 3, No. 3, December 2016   |   Follow on         
Paper in PDF Downloads: 46   Since Dec. 13, 2016 Views: 1507   Since Dec. 13, 2016
Authors
[1]
Chioma O. Ibe, Dept of Chemistry, Alvan Ikoku Federal College of Education, Owerri, Nigeria.
[2]
Emeka E. Oguzie, Department of Chemistry, Federal University of Technology, Owerri, Nigeria.
[3]
Lynda C. Ngozi-Olehi, Dept of Chemistry, Alvan Ikoku Federal College of Education, Owerri, Nigeria.
[4]
Ikechukwu Ukaga, Department of Chemistry, Federal University of Technology, Owerri, Nigeria.
[5]
Blessing E. Okenyi, Dept of Chemistry, Alvan Ikoku Federal College of Education, Owerri, Nigeria.
Abstract
The corrosion current density (Icorr), which is a measure of corrosion rate of copper in aqueous media has been studied using potentiodynamic polarization technique. This is aimed at determining the corrosion behaviour of copper in aqueous aggressive environments. Copper specimens cut out from pure cold-rolled polycrystalline copper test sheets and wet-polished with silicon carbide abrasive paper (from grade #150- #1200), degreased in acetone and dried in warm air were used for the study. The polarization result shows that the corrosion current density of Cu was lower in Na2CO3 than in the acid solutions (H2SO4 and HCl). Cu could more steadily passivate (in a two step process) in the Na2CO3 than in the acid solutions. The two step passivation was attributed to the transformation of Cu+ into Cu2+. The anodic current density value increased in the order: H2SO4>HCl>>Na2CO3, while the corrosion potential (Ecorr) values shifted to more negative (cathodic) potentials. Generally, corrosion rate of Cu metal increased with an increase in the concentration of the electrolyte solutions.
Keywords
Corrosion, Corrosion Current Density, Corrosion Potential, Copper, Polarization
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