Sodium phthalamates as corrosion inhibitors for carbon steel in aqueous hydrochloric acid solution

► N-Alkyl-sodium phthalamates as corrosion inhibitors for industry in acidic medium. ► Compounds behaved as mixed type inhibitors and followed Langmuir adsorption isotherm. ► Efficiencies were proportional to aliphatic chain length and inhibitor concentration. ► Iron complexes and chelates with phth...

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Bibliographic Details
Published in:Corrosion science 2011-12, Vol.53 (12), p.3899-3913
Main Authors: Flores, Eugenio A., Olivares, Octavio, Likhanova, Natalya V., Domínguez-Aguilar, Marco A., Nava, Noel, Guzman-Lucero, Diego, Corrales, Mónica
Format: Article
Language:English
Subjects:
A. Mild steel
Applied sciences
B. Polarization
B. XPS
C. Acid corrosion
C. Acid inhibition
Carbon steels
Corrosion
Corrosion environments
Corrosion inhibitors
Corrosion prevention
Exact sciences and technology
Hydrochloric acid
Inhibition
Metals. Metallurgy
Steels
Surface chemistry
X-ray photoelectron spectroscopy
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Summary:► N-Alkyl-sodium phthalamates as corrosion inhibitors for industry in acidic medium. ► Compounds behaved as mixed type inhibitors and followed Langmuir adsorption isotherm. ► Efficiencies were proportional to aliphatic chain length and inhibitor concentration. ► Iron complexes and chelates with phthalamates contributed to carbon steel protection. Three compounds of N-alkyl-sodium phthalamates were synthesized and tested as corrosion inhibitors for carbon steel in 0.5 M aqueous hydrochloric acid. Tests showed that inhibitor efficiencies were related to aliphatic chain length and dependent on concentration. N-1- n-tetradecyl-sodium phthalamate displayed moderate efficiency against uniform corrosion, 42–86% at 25 °C and 25–60% at 40 °C. Tests indicated that compounds behave as mixed type inhibitors where molecular adsorption on steel followed Langmuir isotherm, whereas thermodynamic suggested that a physisorption process occurred. XPS analysis confirmed film formation on surface, where Fe +2 complexes and Fe +2 chelates with phthalamates prevented steel from further corrosion.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2011.07.023