标题：Experimental investigation on the corrosion inhibition characteristics of mild steel by 5-(2-hydroxyphenyl)-1,3,4-oxadiazole-2-thiol in hydrochloric acid medium
期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2016
卷号：7
期号：8
页码：2971-2988
出版社：University of Mohammed Premier Oujda
摘要：5-(2-Hydroxyphenyl)-1,3,4-oxadiazole-2-thiol (5-HOT) was studied as corrosion inhibitor for mild steel in 1 M HCl using different methods ( weight loss measurements and electrochemical techniques. The results showed that this compound is good corrosion inhibitor for studied system, and its inhibition efficiency increased with inhibitor concentration, reaching a maximum of 95 % with 0.5 mM of 5-HOT at 303 K. Potentiodynamic polarization study revealed that 5-HOT acts as mixed inhibitor and The ac impedance study showed that the double-layer capacitance decreased and charge-transfer resistance increased with increase in the inhibitor concentration, involving increased in inhibition efficiency. The influence of the temperature on the inhibitor efficiency was also studied. The adsorption of 5-HOT was well described by the Langmuir adsorption isotherm. Activation and the adsorption thermodynamic parameters were calculated and discussed. The chemical composition of the protective film was determined by X-Ray Photoelectron Spectroscopy (XPS).
关键词：A. Mild steel; A. Acid solutions; B. XPS; B. EIS; C. Acid inhibition
