Corrosion inhibitive effect of N-(6-methoxyquinolin-8-yl)-pentane-1,4-diamine on mild steel / sulphuric acid solution interface

Corrosion inhibition of mild steel by n-(6-methoxyquinolin-4-yl)-pentane-1,4-diamine (mpd) on mild steel / sulphuric acid solution interface using weight loss,electrochemical impedance spectroscopy (eis) and polarization studies. the inhibitor showed 99.1% inhibition efficiency at 4×10-4 mmpd concentration. polarization studies showed that mpd is a mixed type inhibitor. adsorption of mpd molecules follows langmuir adsorption isotherm on mild steel surface in sulphuric acid medium. sem studies supported data evaluated by different techniques by showing the less rough surface in presence of inhibitor than in absence of inhibitor.contact angle experiments show the hydrophobic nature of mild steel surface with the mpd molecules.