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Thiazole derivatives as corrosion inhibitors for C-steel in sulphuric acid solution Fouda, Abd El-Aziz Al-Sarawy, Ahmed El-Katori, Emad Corrosion inhibitors C-steel Weight loss Synergistic effect Polarization Thiazole derivatives 5-phenylazo-2-thioxo-thiazolidin-4-one and four of its derivatives have been investigated as corrosion inhibitors for C-steel in 1 M sulphuric acid solution using weight-loss and galvanostatic polarization techniques. The efficiency of the inhibitors increases with increase in inhibitor concentration but decreases with a rise in temperature. The conjoint effect of the thiazole derivatives and KBr, KSCN and KI has also been studied. The apparent activation energy (Ea*) and other thermodynamic parameters (ΔS*, ΔH* and ΔG*ads) for the corrosion process have also been calculated. The galvanostatic polarization data indicated that, the inhibitors were of mixed-type, but the cathode is more polarized than the anode. The slopes of the cathodic and anodic Tafel lines (ßc and ßa) are approximately constant and independent of the inhibitor concentration. The adsorption of these compounds on C-steel surface has been found to obey the Temkin's adsorption isotherm. The mechanism of inhibition was discussed in the light of the chemical structure of the undertaken inhibitors. Atlanta Publishing House LLC 2010-12-22 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://www.eurjchem.com/index.php/eurjchem/article/view/105 10.5155/eurjchem.1.4.312-318.105 European Journal of Chemistry; Vol. 1 No. 4 (2010): December 2010; 312-318 2153-2257 2153-2249 eng https://www.eurjchem.com/index.php/eurjchem/article/view/105/PDF