Cyclic nitrones as novel organic corrosion inhibitors for carbon steel in acidic media

Abstract

Purpose

To demonstrate corrosion inhibition capabilities of new cyclic nitrones, containing hydrophobic substituents.

Design/methodology/approach

A number of new cyclic nitrones were synthesized. Corrosion inhibition efficiencies of these organic inhibitors were determined by gravimetric and electrochemical methods, using carbon steel as the substrate metal and 1 M HCl at 60°C as the corrosive environment. Concentration of inhibitor was varied between 50 and 400 ppm.

Findings

All compounds exhibited excellent corrosion efficiencies that ranged between 90.0 and 98.3 percent in 1 M HCl at 60°C. Tafel tests corroborated these results.

Research limitations/implications

The inhibitors were tested in acidic medium. It is unknown how these inhibitors will function in the presence of other ions that are typically present in natural corrosive environment.

Originality/value

All organic compounds presented in this work are new and this is the first time their corrosion inhibition characteristics have been evaluated.

Citation

Rahman, S.U., Saeed, M.T. and Ali, S.A. (2005), "Cyclic nitrones as novel organic corrosion inhibitors for carbon steel in acidic media", Anti-Corrosion Methods and Materials, Vol. 52 No. 3, pp. 154-159. https://doi.org/10.1108/00035590510595148