Abstract
Electromotive force (E) measurements were made on an electrochemical cell [CuxHg|CuCl2(m) in a solvent S|AgCl-Ag] (where S is a dilute aqueous solution (0.01 m) of amino acid (glycine, alanine, methionine and glutamic acid) or aliphatic carboxylic acid (formic acid, acetic acid, n-butyric acid and glutaric acid)) at 30 °C. These measured E values were used to compute the dissociation constants (K1 and K2) and the degree of dissociation (α1 and α2) by iterative procedures. The standard cell potential (E°) and the mean activity coefficient (γ±) of CuCl2 were also determined. The E° data were next used to evaluate the Gibbs energy of transfer (Δ Gtr{ring operator}) of CuCl2 from water to dilute aqueous solutions of the amino/carboxylic acids. The negative Δ Gtr{ring operator} values suggested that these acids act as potential corrosion inhibitors. The magnitudes of Δ Gtr{ring operator} values show that the amino acids act as better corrosion inhibitors towards copper than the aliphatic carboxylic acids.
Original language | English |
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Pages (from-to) | 1293-1298 |
Number of pages | 6 |
Journal | Corrosion Science |
Volume | 51 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2009 Jun |
Bibliographical note
Funding Information:D.C. Spah thanks the Korean Federation of Science and Technology Societies (KOFST) and the Yonsei University, Seoul for inviting him as a Visiting Scientist under the Brain Pool Program.
All Science Journal Classification (ASJC) codes
- Chemistry(all)
- Chemical Engineering(all)
- Materials Science(all)