Abstract
The influence of thiophene and five of its substituted derivatives on the corrosion inhibition of steel in 0.5 m H2SO4 solution was studied using weight-loss, electrochemical polarisation, and impedance measurements. 5-tert-butoxythiophene-2-carbaldehyde phenylhydrazone (TBCP) is the best inhibitor and its inhibition efficiency increases with increase in concentration to attain 87% at 5×10−3 m. Potentiodynamic polarisation studies clearly reveal that it acts essentially as a cathodic inhibitor. The partial π-charge on atoms has been calculated. A correlation between the highest occupied molecular orbital E HOMO and inhibition efficiencies was sought. The inhibition efficiency of TBCP is not affected by rise in temperature in the range 298–353 K. E% values obtained from weight-loss and electrochemical methods were in good agreement. Adsorption of TBCP on steel has an S-shaped adsorption isotherm.
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Bouklah, M., Hammouti, B., Benkaddour, M. et al. Thiophene derivatives as effective inhibitors for the corrosion of steel in 0.5 m H2SO4 . J Appl Electrochem 35, 1095–1101 (2005). https://doi.org/10.1007/s10800-005-9004-z
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DOI: https://doi.org/10.1007/s10800-005-9004-z