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Abstract SUMMARY AND CONCLUSIONS In this study, three Schiff bases were synthesized by the reaction of 3- amino-1,2,4-triazole and three aldehydes namely: salicyldehyde, anisaldehyde and vanillin. The chemical structures of the obtained Schiff bases were confirmed using elemental analysis, infra red spectroscopy and proton nuclear magnetic resonance. The results of the analysis confirmed the expected chemical structures of the prepared Schiff bases as follows: N N N H N HO C H C H OH N OCH3 N N H N C H OCH3 N N N H N (I) (II) (III) The synthesized Schiff bases were evaluated as corrosion inhibitors against the dissolution of carbon steel in acidic medium using weight loss and potentiodynamic measurements. Also, these compounds were evaluated as antimicrobial agents against the growth of gram positive and gram negative bacteria using inhibition zone measurements and minimum inhibition concentrations. The results of the corrosion inhibition measurements showed that these compounds act as efficient corrosion inhibitors. these compounds decreased the corrosion rate of carbon steel in acidic medium. increasing their concentration in the medium decreases the carbon steel dissolution considerably. The chemical structure of the prepared inhibitors has a major influence on their inhibition efficiency. vanillin derivative exhibited the maximum inhibition, while salicylaldehyde and anisaldehyde showed comparable inhibition efficiencies to each other. Potentiodynamic polarization measurements showed that these inhibitors act as mixed type inhibitors. the mixed type of these inhibitors indicate that SUMMARY AND CONCLUSION these inhibitors decreases both the cathodic and anodic reactions, which efficiently decreases the carbon steel dissolution and consequently protect the carbon steel surface in the acidic medium. The antimicrobial activities of these compounds showed their high tendency towards inhibiting and preventing the growth of the gram positive and gram negative bacteria and fungi |