Electrochemical and quantum chemical study of 4-[(E)-[(2,4-dihydroxy phenyl) methylidine] amino]-6-methyl-3-sulphanylidine-2,3,4,5-tetra hydro-1,2,4-triazin-5-one [DMSTT]

Electrochemical and quantum chemical study of 4-[(E)-[(2,4-dihydroxy phenyl) methylidine] amino]-6-methyl-3-sulphanylidine-2,3,4,5-tetra hydro-1,2,4-triazin-5-one [DMSTT]

The inhibition of mild steel in aerated 1 M hydrochloric acid solution was studied using conventional weight loss method, potentiodynamic polarization studies (Tafel), linear polarization studies (LPR), electrochemical impedance spectroscopy (EIS) and quantum chemical calculation in the presence and...

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Bibliographic Details
Published in:Materials chemistry and physics Vol. 123; no. 1; pp. 218 - 224
Main Authors: John, Sam, Joseph, Bincy, Balakrishnan, K.V., Aravindakshan, K.K., Joseph, Abraham
Format: Journal Article
Language:English
Published: Elsevier B.V 01-09-2010
Subjects:
Adsorption
Carbon steels
Corrosion inhibitor
Corrosion inhibitors
EIS
Electrochemical impedance spectroscopy
Inhibition
Mathematical analysis
Mild steel
Phenyls
Quantum chemical calculation
Quantum chemistry
Surface chemistry
Mild steel
Quantum chemical calculation
Corrosion inhibitor
EIS
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Summary:The inhibition of mild steel in aerated 1 M hydrochloric acid solution was studied using conventional weight loss method, potentiodynamic polarization studies (Tafel), linear polarization studies (LPR), electrochemical impedance spectroscopy (EIS) and quantum chemical calculation in the presence and absence of different concentrations of DMSTT. The inhibition efficiency increased markedly with increase in the additive concentrations, but slightly decreased with increasing temperature. The presence of DMSTT decreases the double layer capacitance and increases the charge-transfer resistance. The value of activation energy ( E a) for mild steel corrosion and thermodynamic parameters such as adsorption equilibrium constant ( K ads), free energy of adsorption (Δ G ads) values were calculated and discussed. The inhibitor molecule first adsorbed on mild steel surface according to Langmuir adsorption isotherm.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2010.03.085