alexa Investigation of the adsorption characteristics of someselectedsulphonamidederivatives as corrosion inhibitorsatmildsteel hydrochloricacid interface: Experimental, quantum chemical and QSAR studies.


Journal of Steel Structures & Construction

Author(s): Murulana LC Kabanda MM Ebens

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Five sulphonamides derivatives namely, sulphanilamide (SNA), sulphamethoxazole (SMX), sulphadimethoxine (SDM), sulphisoxazole (SSZ), and sulphamethizole (SMZ) have been selected as corrosion inhibitors for mild steel in hydrochloric acid solutions utilizing electrochemical techniques as well as theoretical method (using DFT). These compounds were found to protect mild steel through spontaneous adsorption on to mild steel surface, thereby blocking the active sites. The obtained thermodynamic and kinetic parameters deduced that sulphonamides adopt a Langmuir adsorption isotherm mechanism. Results from electrochemical impedance and potentiodynamic polarization showed exceptional correlation and revealed that these compounds are mixed-type inhibitors. The formation of the adsorption film on the mild steel surface was confirmed by SEM, EDS and FTIR. Quantum chemical calculations and quantitative...

This article was published in Journal of MolecularLiquids and referenced in Journal of Steel Structures & Construction

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