Abstract
Four 1,3-diketone malonates compounds were synthesized and tested as corrosion inhibitors for mild steel in 1.0M aqueous hydrochloric acid. Gravimetric and polarization tests showed that inhibitor efficiencies were related to molecular moiety and depended on tautomer concentration, i.e. enol–keto and diketo. Both tautomers displayed relatively high corrosion inhibition efficiency (75–96%) at 100mgL−1, which increased with temperature (25–55°C) and dependent on diketo population. Improvement in corrosion resistance was related to the presence of different substituent groups, from which hydrogen substituent contributed the most, apparently due to easiness of electron acceptance as confirmed by quantum chemical calculations.
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