Corrosion inhibitors performance for mild steel in CO2 containing solutions

The Electrochemical Impedance Spectroscopy (EIS), was used to evaluate and compare the behavior of three different corrosion inhibitors: quaternary amine (QA), oleic imidazoline (OI) and amino coco propionic acid (ACP), on the corrosion of mild steel in 3% NaCl solutions, saturated with CO2 gas, und...

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Bibliographic Details
Published in:Materials and corrosion 2007-06, Vol.58 (6), p.427-437
Main Authors: Zavala Olivares, G., Hernández Gayosso, M. J., Mora Mendoza, J. L.
Format: Article
Language:English
Subjects:
adsorption
Applied sciences
CO2 corrosion
Corrosion
Corrosion environments
Corrosion inhibitors
Corrosion prevention
Electrochemical impedance spectroscopy
Exact sciences and technology
inhibitor
Metals. Metallurgy
mild steel
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Summary:The Electrochemical Impedance Spectroscopy (EIS), was used to evaluate and compare the behavior of three different corrosion inhibitors: quaternary amine (QA), oleic imidazoline (OI) and amino coco propionic acid (ACP), on the corrosion of mild steel in 3% NaCl solutions, saturated with CO2 gas, under static conditions. Two pH values: 3.8 and 5.5 were considered. Under the conditions considered in this work, the results indicated film formation at the metal surface, probable due to the formation of iron carbonate. This condition modified the values of the resistance and double layer capacitance of the system. In general terms, the ACP inhibitor exhibited better performance, compared to the QA and OI. During the impedance measurements with OI and ACP, some deviations were observed at high frequencies, indicating probably that the inhibitors adsorption occurs in different way to the QA inhibitor and the amine adsorption is weaker than the other two inhibitors adsorption.
ISSN:0947-5117
1521-4176
DOI:10.1002/maco.200604023