Effect of solvents on the corrosion inhibition of copper by 1,2,3-benzotriazole

Manjula Spah, Dal Chand Spah, Krishan Chander Singh, Vibha Gupta, Ho Jun Song, Jin Won Park

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Electromotive force (E) measurements have been made at 303.15 K on the cell, Cux Hg/CuCl2 (m) in solvent S′ [S′=W or FD or DMF each containing 15 ppm of 1,2,3-benzotriazole (BTA)] /AgCl/Ag (where W, FD and DMF represent the solvents water, formamide and N,N-dimethylformamide, respectively). The Emf data have been compared with the corresponding data under the same conditions in pure W, FD and DMF; the Emf values change from negative to very positive in the presence of BTA in these solutions and suggest the possibility that the presence of BTA in W, FD and DMF helps to bind copper ions with solvent molecules through formation of new complex structures of the film formed on the metal surface. We have suggested the probable mechanism of formation of a protective film through complex formation. The higher Emf values in the presence of BTA indicate strong ion-solvent interactions and the order of interactions was found to be as: FD≥DMF>W. Further iterative procedures were employed to evaluate K1,K2 (dissociation constants), α12 (degrees of dissociation), γ± (mean activity coefficient) and Eo (standard cell potential) making use of the measured E values. The standard molar Gibbs energy of transfer, ΔGtr o , of CuCl2 from the pure S to S′ were calculated using the computed standard cell potentials. The calculated ΔGtro values were found to be negative which was indicative of strong ion-solvent interactions and reasonably supported the trend of ion-solvent interactions. From these studies we concluded that BTA acts as a better corrosion inhibitor towards copper in FD and DMF than water.

Original languageEnglish
Pages (from-to)1197-1206
Number of pages10
JournalJournal of Solution Chemistry
Volume37
Issue number9
DOIs
Publication statusPublished - 2008 Sep 1

Fingerprint

Corrosion
Copper
corrosion
copper
Ions
ions
Electric potential
cells
interactions
dissociation
Dimethylformamide
Electromotive force
electromotive forces
Water
Energy Transfer
Activity coefficients
Protective coatings
Corrosion inhibitors
Gibbs free energy
inhibitors

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Physical and Theoretical Chemistry

Cite this

Spah, Manjula ; Spah, Dal Chand ; Singh, Krishan Chander ; Gupta, Vibha ; Song, Ho Jun ; Park, Jin Won. / Effect of solvents on the corrosion inhibition of copper by 1,2,3-benzotriazole. In: Journal of Solution Chemistry. 2008 ; Vol. 37, No. 9. pp. 1197-1206.
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Effect of solvents on the corrosion inhibition of copper by 1,2,3-benzotriazole. / Spah, Manjula; Spah, Dal Chand; Singh, Krishan Chander; Gupta, Vibha; Song, Ho Jun; Park, Jin Won.

In: Journal of Solution Chemistry, Vol. 37, No. 9, 01.09.2008, p. 1197-1206.

Research output: Contribution to journalArticle

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