کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1471233 | 990345 | 2009 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermodynamic studies on corrosion inhibition of aqueous solutions of amino/carboxylic acids toward copper by EMF measurement
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
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 (ÎGtrâ) of CuCl2 from water to dilute aqueous solutions of the amino/carboxylic acids. The negative ÎGtrâ values suggested that these acids act as potential corrosion inhibitors. The magnitudes of ÎGtrâ values show that the amino acids act as better corrosion inhibitors towards copper than the aliphatic carboxylic acids.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Corrosion Science - Volume 51, Issue 6, June 2009, Pages 1293-1298
Journal: Corrosion Science - Volume 51, Issue 6, June 2009, Pages 1293-1298
نویسندگان
Manjula Spah, Dal Chand Spah, Balraj Deshwal, Seungmoon Lee, Yoon-Keun Chae, Jin Won Park,