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Electrochemical and XPS studies of 2,5-bis(n-pyridyl)-1,3,4-thiadiazoles adsorption on mild steel in perchloric acid solution
- Source :
-
Applied Surface Science . Jan2002, Vol. 185 Issue 3/4, p197. 9p. - Publication Year :
- 2002
-
Abstract
- The effect of isomers of 2,5-bis(n-pyridyl)-1,3,4-thiadiazole (n-PTH) on the corrosion of mild steel in perchloric acid solution (1 M HClO4) has been investigated using weight loss, electrochemical impedance spectroscopy and potentiodynamic polarisation. Inhibition efficiency is dependent upon the thiadiazole structure, with 3-PTH serving as a better inhibitor than 2-PTH. 2-PTH stimulates corrosion at low concentrations. Polarisation curves indicate that 3-PTH acts as an anodic-type inhibitor whereas 2-PTH is of the cathodic-type. X-ray photoelectron spectroscopy were also carried out to establish the mechanism of corrosion inhibition of 3-PTH and stimulation corrosion of 2-PTH of mild steel in acid solution. Adsorption of 3-PTH on the mild steel surface in 1 M HClO4 follows the Langmuir adsorption isotherm model. [Copyright &y& Elsevier]
- Subjects :
- *MILD steel
*PERCHLORIC acid
*STEEL corrosion
*X-ray photogrammetry
Subjects
Details
- Language :
- English
- ISSN :
- 01694332
- Volume :
- 185
- Issue :
- 3/4
- Database :
- Academic Search Index
- Journal :
- Applied Surface Science
- Publication Type :
- Academic Journal
- Accession number :
- 7744915
- Full Text :
- https://doi.org/10.1016/S0169-4332(01)00650-X