Some nonionic surfactants as inhibitors of the corrosion of iron in acid chloride solutions

Journal Article · Thu Feb 01 04:00:00 EST 1996 · Corrosion

DOI:https://doi.org/10.5006/1.3292100· OSTI ID:201371

Elachouri, M; Hajji, M S; Salem, M; Kertit, S; Aride, J ^[1]; Coudert, R ^[2]; Essassi, E ^[3]

---

1. Ecole Normale Superieure de Takaddoum, Rabat (Morocco)
2. Faculte des Sciences et Techniques, Tours (France). Lab. de Synthese et d`Etudes Physicochemiques Organiques
3. 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

Related Subjects

36 MATERIALS SCIENCE
ADSORPTION HEAT
ADSORPTION ISOTHERMS
CONCENTRATION RATIO
CORROSION INHIBITORS
CORROSION PROTECTION
CORROSIVE EFFECTS
GLYCOLS
HYDROCHLORIC ACID
IRON
PERFORMANCE
TEMPERATURE DEPENDENCE