corrosion behavior of zinc in 1.0 n hydrochloric acid with cnidoscolus chayamansa – a green approach

Inhibition effect of Cnidoscolus Chayamansa leaves extract on corrosion of Zinc in 1.0 N HCl was investigated by mass loss measurement with various period, contact and temperature. The observed result indicates that the corrosion inhibition efficiency was increased with increase of inhibitor concentration and temperature. The thermodynamic parameters (viz; Ea, ΔHads, ΔGads, ΔSads) were evaluated for corrosion process, which suggest that the adsorption is endothermic, spontaneous and chemisorptions. The inhibitor follows Langmuir and Temkin adsorption isotherm. The protective film formed on the metal surface was analyzed by using various spectroscopic studies viz; UV, FT-IR , XRD and SEM-EDX techniques.