N-heterocyclic amine derivatives as efficient corrosion inhibitors for carbon steel in acidic medium

A novel heterocyclic amine derivatives,namely n,n'- substituted pyridinyl ethylene diamine tetra acetic acid sodium salt {a} and ethylene diamine n,n'-diacetic acid di (2-methylene tetra hydro furfuryl) acetate {b} were synthesized and their structure confirmations were performed by ftir,1hnmr and 13cnmr spectra. the inhibition effectiveness was evaluated against the corrosion of carbon steel in 1 m hcl by weight loss and polarization techniques. the results showed that the synthesized derivatives are good corrosion inhibitors for carbon steel in 1 m hcl medium,their inhibition efficiency,increased with inhibitor concentration,and {a} is slightly more effective than {b}. the potentiostatic polarization study showed that {a} and {b} are mixed-type inhibitors in 1 m hcl. these compounds prevent carbon steel from corrosion by adsorption to the steel surface and forming insoluble complexes with ferrous species. the weight loss results and potentiostatic polarization studies were in reasonable agreement.