（v16preprint61）Corrosion Inhibition of Mild Steel iCorrosion in 1M H2SO4 by Ampicillin asan Inhibitor

摘要

Corrosion behaviour of mild steel in 1M H2SO4 with Ampicillin as corrosion inhibitorhas been investigated by using weight loss, Potentiodynamic polarization, Electrochemicalimpedance spectroscopy, Hydrogen permeation and diffuse reflectance spectroscopicstudies. All these techniques reveal that inhibition efficiency increases with increase in theconcentration of Ampicillin. Scanning electron microscopy (SEM) was carried out tocharacterize the surface morphology of the metal specimens. Polarization studies indicatedthat Ampicillin behaved as cathodic inhibitor. Diffuse reflectance spectroscopy confirmedthe adsorption of inhibitor on the mild steel surface obeying Langmuir adsorption isotherm.A chemoffice 3D simulation technique was used to run the quantum mechanical analysisand established correlations between different types of descriptors and measured corrosioninhibition efficiencies of Ampicillin. The quantum chemical analysis substantiates theinhibition efficiencies of the compound determined by electrochemical methods.