Benzodiazepine derivatives as corrosion inhibitors for mild steel in sulphuric acid medium

4-(2-hydroxy phenyl)-2-phenyl-2,3-dihydro-1H-1,5-benzo diazepine(SATD),4-(2-hydroxy phenyl)-2-methyl-2,3- dihydro-1H-1,5-benzodiazepine (SAD), 4-methyl-2-phenyl-2,3-dihydro-1H-1,5-benzodiazepine (BAD) were synthesized by the condensation of o-phenylenediamine and chalkones and characterized by FTIR spectra. Corrosion inhibition property on mild steel in sulphuric acid medium of the benzodiazepines was investigated by weight loss and electrochemical method. Scanning electron microscopic studies (SEM) were carried out to study the surface morphology of the inhibited and uninhibited metal samples. The results showed that inhibition efficiency of the inhibitors depended on concentration of inhibitor and temperature. The thermodynamic parameters such as Ea, ΔG0, ΔH0, ΔS0 have been evaluated. The inhibition efficiency has been synergistically enhanced by the addition of halide ions.

Author(s): T. Sasikala,K. Parameswari, S. Chitra and A. Kiruthika

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