Electrochemical adsorption studies of urea on copper surface in alkaline medium

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• 作者：Fouzia Altaf ; ^{fzali212@yahoo.com} ; Rumana Qureshi ; Safeer Ahmed ; Athar Y. Khan ; Amtul Naseer
• 关键词：Copper ; Cyclic voltammetry ; EIS ; Adsorption
• 刊名：Journal of Electroanalytical Chemistry
• 出版年：2010
• 出版时间：1 April 2010
• 年：2010
• 卷：642
• 期：1
• 页码：98-101
• 全文大小：360 K

文摘

The inhibitive action of urea on the corrosion behavior of copper was investigated in borate buffer pH (8.4) by means of cyclic voltammetry and electrochemical impedance spectroscopy (EIS). A consistent trend of increase in inhibition efficiency was observed as a function of concentration of urea. The adsorption of urea on copper surface was found to obey the Langmuir adsorption isotherm with ¦¤G = ?5.2 kJ/mole and adsorption constant K = 2.7 ¡Á 10⁴ dm³/mole. Impedance spectroscopic measurements confirmed that charge transfer resistance increases in presence of urea upon increasing its concentration.