Some organic and inorganic compounds as inhibitors for carbon steel corrosion in 3.5 percent NaCl solution

Abstract

Purpose

To study the effects of the sodium salts of molybdate, tungstate and monovanadate as well as some derivatives of Neville‐Winter acid azo dyes on the corrosion of carbon steel in 3.5 percent NaCl solution.

Design/methodology/approach

Open circuit potential measurement and potentiostatic polarization techniques have been used.

Findings

It was found that all the compounds had inhibition effects on carbon steel dissolution. Inhibition efficiency (IE) increased with increase in inhibitor concentration. The process of inhibition was attributed to the formation of an adsorbed film on the metal surface, which protects the metal against the corrosive medium. The adsorption of these compounds on the steel/chloride interface was found to follow Freundlich adsorption isotherm behaviour.

Originality/value

Proves the effectiveness of the sodium salts of molybdate, tungstate and monovanadate as well as some derivatives of Neville‐Winter acid azo dyes on the corrosion of carbon steel in 3.5 percent NaCl solution.

Citation

Abdallah, M., El‐Etre, A.Y., Soliman, M.G. and Mabrouk, E.M. (2006), "Some organic and inorganic compounds as inhibitors for carbon steel corrosion in 3.5 percent NaCl solution", Anti-Corrosion Methods and Materials, Vol. 53 No. 2, pp. 118-123. https://doi.org/10.1108/00035590610650820