Inhibiting Effects of Two Derivatives of Amino-Thiophenol on the Corrosion of Copper by Electrochemical Methods

Corrosion inhibition of the two thio compounds, 2-{[(2-sulfanyl-phenyl)imino]methyl}phenol (SIMP) and 2-{[(Z)-1-(4-methyl-phenyl)methylidene]amino}-1-benzenthiol (MMAB), as corrosion inhibitors for copper in 15% hydrochloric acid (HCl) have been investigated by potentiodynamic polarization measureme...

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Bibliographic Details
Published in:Corrosion (Houston, Tex.) Tex.), 2012-12, Vol.68 (12), p.1119-1125
Main Authors: Behpour, M, Mohammadi, N
Format: Article
Language:English
Subjects:
ACTIVATION ENERGY
Adsorption
Analytical methods
ANODES
Anodic polarization
Chloride
Confidence intervals
Copper
Copper compounds
CORROSION
Corrosion effects
CORROSION INHIBITORS
Corrosion potential
Corrosion tests
Electrochemical impedance spectroscopy
Electrochemistry
Electrode polarization
Electrodes
Enthalpy
ENTROPY
Ethanol
Free energy
Gibbs free energy
Heat
Hydrochloric acid
Inhibition
Inhibitors
MICA
Phenols
Polarization
Software
Spectroscopy
Spectrum analysis
Surface chemistry
Thiophenol
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Summary:Corrosion inhibition of the two thio compounds, 2-{[(2-sulfanyl-phenyl)imino]methyl}phenol (SIMP) and 2-{[(Z)-1-(4-methyl-phenyl)methylidene]amino}-1-benzenthiol (MMAB), as corrosion inhibitors for copper in 15% hydrochloric acid (HCl) have been investigated by potentiodynamic polarization measurements and electrochemical impedance spectroscopy. Potentiodynamic polarization results show that corrosion potentials shift more toward the anodic region in the presence of thio compounds than that of blank solution. The adsorption of inhibitors on the copper surface follows from Langmuir adsorption isotherm. Activation energy (Ea), Gibbs free energy (ΔGads0), enthalpy (ΔH*), and entropy (ΔS*) of corrosion process are calculated by using the experimental measurements.
ISSN:0010-9312
1938-159X
DOI:10.5006/0607