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A New Green Ionic Liquid-Based Corrosion Inhibitor for Steel in Acidic Environments.

Molecules (Basel, Switzerland) (2015-06-20)
Ayman M Atta, Gamal A El-Mahdy, Hamad A Al-Lohedan, Abdel Rahman O Ezzat
ABSTRACT

This work examines the use of new hydrophobic ionic liquid derivatives, namely octadecylammonium tosylate (ODA-TS) and oleylammonium tosylate (OA-TS) for corrosion protection of steel in 1 M hydrochloric acid solution. Their chemical structures were determined from NMR analyses. The surface activity characteristics of the prepared ODA-TS and OA-TS were evaluated from conductance, surface tension and contact angle measurements. The data indicate the presence of a double bond in the chemical structure of OA-TS modified its surface activity parameters. Potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) measurements, scanning electron microscope (SEM), Energy dispersive X-rays (EDX) analysis and contact angle measurements were utilized to investigate the corrosion protection performance of ODA-TS and OA-TS on steel in acidic solution. The OA-TS and ODA-TS compounds showed good protection performance in acidic chloride solution due to formation of an inhibitive film on the steel surface.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
p-Toluenesulfonic acid monohydrate, ACS reagent, ≥98.5%
Sigma-Aldrich
Oleylamine, technical grade, 70%
Sigma-Aldrich
Hydrochloric acid solution, 1.0 N, BioReagent, suitable for cell culture
Sigma-Aldrich
Hydrochloric acid, 36.5-38.0%, BioReagent, for molecular biology
Supelco
Hydrochloric acid solution, volumetric, 0.1 M HCl (0.1N), endotoxin free
Sigma-Aldrich
p-Toluenesulfonic acid monohydrate, ReagentPlus®, ≥98%
Sigma-Aldrich
Trichostatin A, ≥98% (HPLC), from Streptomyces sp.
Sigma-Aldrich
Octadecylamine, ≥99% (GC)
Sigma-Aldrich
Hydrogen chloride, ReagentPlus®, ≥99%
Sigma-Aldrich
Hydrochloric acid solution, 32 wt. % in H2O, FCC
Sigma-Aldrich
Hydrochloric acid solution, ~6 M in H2O, for amino acid analysis
Oleylamine, ≥98% (primary amine)
Sigma-Aldrich
Hydrogen chloride solution, 3 M in cyclopentyl methyl ether (CPME)
Sigma-Aldrich
Octadecylamine, ≥99.0% (GC)
Sigma-Aldrich
p-Toluenesulfonic acid monohydrate, ≥99% (calc. to H2O free subst.)
Sigma-Aldrich
Octadecylamine, technical grade, 90%