Abstract
The present work deals with the corrosion behavior of mild steel in acidic medium. The inhibitive effect of substituted 1, 3, 4-Thiadiazol-2-amines on the corrosion of mild steel in 1 M H2SO4has been studied by weight loss and electrochemical methods. The electrochemical parameters for mild steel in acidic solution with and without inhibitor were calculated. The effect of temperature on the corrosion rate, activation energy and free energy of adsorption were also calculated. The synergistic effect has been studied by weight loss and electrochemical methods. The electrochemical parameters for mild steel in acidic solution were also calculated.
Highlights
Most of the acid inhibitors are organic compounds nitrogen, sulphur and/or oxygen atoms
In acidic solution these compounds exists as protonated species. These protonated species may adsorb on the cathodic sites of mild steel and decrease the evolution of hydrogen. It is apparent from the molecular structures that these compounds are able to get adsorbed on the metal surface through π electrons of aromatic ring and lone pair of electrons of N,O and S atoms
The inhibition of corrosion by thiadiazolines is due to the physical adsorption on the metal surface
Summary
Most of the acid inhibitors are organic compounds nitrogen, sulphur and/or oxygen atoms. It has been reported that many heterocyclic compounds containing heteroatoms like N, O, S have been proved to be effective inhibitor for the corrosion of steel in acid media. The influence of such organic compounds, on the corrosion of mild steel in acidic solution has been investigated by several authors. The planarity and lone electron pairs in the heteroatoms are important features that determine the adsorption of these molecules on the metallic surface They can adsorb on the metal surface, block the active sites on the surface and there by reduce the corrosion rate
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