Some nonionic surfactants as inhibitors of the corrosion of iron in acid chloride solutions
- Ecole Normale Superieure de Takaddoum, Rabat (Morocco)
- Faculte des Sciences et Techniques, Tours (France). Lab. de Synthese et d`Etudes Physicochemiques Organiques
- Faculte des Sciences de Rabat (Morocco). Lab. de Chimie Organique
The inhibition effect of the surfactants 1,2-hexanediol (HD), 1,2,3-octanetriol (OT); 1,2,3-nonanetriol (NT); and 3,7-dimethyl-1,2,3,6,7-octanepentol (DOP) on the corrosion of iron in 1 M hydrochloric acid (HCl) was studied. Results obtained from gravimetric methods showed inhibition efficiencies increased with increasing surfactant concentrations and attained a maximum round their critical micellar concentration (cmc). A comparative study of corrosion inhibition of surfactants indicted DOP was the best inhibitor. Polarization measurements showed DOP was a cathodic type-inhibitor and acted on the cathodic reaction without modifying the mechanism of the hydrogen evolution reaction. DOP appeared to function through a general adsorption mode following the Langmuir adsorption isotherm. The effect of temperature on the corrosion behavior of iron in both 1 M HCl and 1 M HCl with addition of various concentrations of DOP was studied in the temperature range from 18 C to 48 C. The associated activation corrosion and free adsorption energies were determined.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 201371
- Journal Information:
- Corrosion, Journal Name: Corrosion Journal Issue: 2 Vol. 52; ISSN 0010-9312; ISSN CORRAK
- Country of Publication:
- United States
- Language:
- English
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