Inhibition effect of adsorption layer of 1-phenyl-4-(4-nitrophenyl) thiosemicarbazide on the corrosion of 18 Ni 250-grade welded maraging steel in 1.0 M hydrochloric acid medium
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Date
2015
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Publisher
Kluwer Academic Publishers
Abstract
The thiosemicarbazide derivative, 1-phenyl-4-(4-nitrophenyl)thiosemicarbazide (PNPT), was synthesized and its inhibiting action on the corrosion of welded maraging steel in 1.0 M hydrochloric acid was investigated by electrochemical methods of potentiodynamic (Tafel) polarization and electrochemical impedance spectroscopy. The inhibitor, PNPT, acted essentially as a mixed-type inhibitor with predominant cathodic action. The inhibition efficiency increased with the increase in inhibitor concentration. An inhibition efficiency of about 86 % was exhibited at 30 °C, which decreased with the increase in the temperature. The adsorption of the inhibitor layer formed was through predominant physical adsorption process. © 2014 Springer Science+Business Media Dordrecht.
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Keywords
Adsorption, Corrosion, Electrochemical impedance spectroscopy, Hydrochloric acid, Maraging steel, Polarization, Welding, Corrosion inhibition, EIS, ELectrochemical methods, Hydrochloric acid medium, Inhibition efficiency, Inhibitor concentration, Physical adsorption, Thiosemicarbazide derivatives, Electrochemical corrosion
Citation
Research on Chemical Intermediates, 2015, 41, 10, pp. 7095-7113