Abstract
The inhibition actions of ethanolic extract of Enicostemma littorale (EL) leaves-Zn2+ for carbon steel (CS) surface in well water has been studied by mass-loss study, Tafel slopes, and Nyquist plots, Impacts of inhibitor concentration (100ppm-500ppm), temperatures (30◦C-70◦C), pH (3,8,12) and submersion period (1,3,7,12) were researched on the prevention capacity of the extract on CS submerged in well water. The adsorption of ethanolic extract of EL leaves onto the surface of CS pursued that as indicated by a Langmuir model. The Enicostemma littorale extract exposed a blended-type corrosion inhibitor in the considered environment as indicated by the electrochemical studies. Theoretical fittings for the corrosion kinetics and thermodynamic parameters have been determined to explain the method of adsorption of ethanolic extract of EL-Zn2+ on the CS surface. ΔGads values are less than -20KJ/mol. From these values, the adsorption of an inhibitor system is physisorption on the CS surface. Energy-dispersive X-ray technique was utilized to identify the elemental composition of the corrosion substances or potentially adsorbed inhibitor film on the CS. Scanning electron microscopy, atomic force microscopy and Fourier transfer infrared assessments affirm the development of a defensive layer by the ethanolic extract of Enicostemma littorale leaves on the CS surface in well-water.
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