Abstract
Purpose To study the effects of the sodium salts of molybdate, tungstate and monovanadate as well as some derivatives of NevilleWinter acid azo dyes on the corrosion of carbon steel in 3.5 percent NaCl solution. Designmethodologyapproach 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 steelchloride interface was found to follow Freundlich adsorption isotherm behaviour. Originalityvalue Proves the effectiveness of the sodium salts of molybdate, tungstate and monovanadate as well as some derivatives of NevilleWinter acid azo dyes on the corrosion of carbon steel in 3.5 percent NaCl solution.