experimental and theoretical study on corrosion inhibitive property of self-assembled nano films formed by salpn molecules on carbon steel surface in hydrochloric acid

Salpn has been evaluated as corrosion inhibition for iron in 0.1 m hcl when the monolayers films of—n,n'-bis (salicylaldehyde)-1,3-diaminopropane salpn were self-assembled on the surface of iron to improve anticorrosion property of the substrate. monolayer formation takes place when carbon steel is precoated in hot ethanolic/aqueous 1 mm salpn solution for 10, 20 and 30 min, and rinsing the physisorbed molecules in distilled water and heating in a hot air oven. the films of salpn inhibitor were characterized by weight loss method and electrochemical impedance spectroscopy, electrochemical polarization curves. results revealed that salpn performed excellently as a corrosion protection for iron in hcl solution. the formations of monolayers were confirmed by sem study and atr-ftir spectra. taken together, the outcomes of present study exhibited that precoating of salpn on the substrate surface is able to provide protection efficiency up to 95% and escalating of the soaking time in corrosive environment up to 24 h only reduces slightly protection efficiency (around 6%) implying this layer act as effective corrosion inhibitors.