Surface protection of copper in aerated 3.5% sodium chloride solutions by 3-amino-5-mercapto-1,2,4-triazole as a copper corrosion inhibitor

Surface protection of copper in aerated 3.5% NaCl solutions by 3-amino-5-mercapto-1,2,4-triazole (AMTA) has been reported. The study has been carried out using weight loss, pH, potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), and chronoamperometric (CA) measurements...

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Bibliographic Details
Published in:Journal of applied electrochemistry 2010-08, Vol.40 (8), p.1555-1562
Main Authors: Sherif, El-Sayed M., Almajid, Abdulhakim A.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Copper
CORROSION
CORROSION INHIBITORS
Corrosion prevention
CORROSION PROTECTION
Electrochemical impedance spectroscopy
Electrochemistry
Industrial Chemistry/Chemical Engineering
Inhibition
Original Paper
Physical Chemistry
POLARIZATION
SCANNING ELECTRON MICROSCOPY
SODIUM CHLORIDE
Surface chemistry
TRIAZOLE
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Summary:Surface protection of copper in aerated 3.5% NaCl solutions by 3-amino-5-mercapto-1,2,4-triazole (AMTA) has been reported. The study has been carried out using weight loss, pH, potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), and chronoamperometric (CA) measurements along with scanning electron microscopy (SEM) and energy dispersive X-ray (EDS) investigations. Weight-loss data indicated that the dissolution rate and the pH of the solution decreased to a minimum after 24 days of copper immersion due to the inhibitive action of AMTA. PDP, CA, and EIS measurements showed that AMTA decreased the corrosion rates and increased the polarization resistance and inhibition efficiency. This effect was increased with increasing AMTA concentration as well as the immersion time of the copper electrode to 50 h before measurements. SEM micrograph and EDS analysis proved that the inhibition of copper corrosion takes place due to adsorption of AMTA onto the surface. These results together confirmed that AMTA is a good mixed-type inhibitor and the inhibition of copper corrosion is achieved by strong adsorption of AMTA molecules.
ISSN:0021-891X
1572-8838
DOI:10.1007/s10800-010-0140-8