Вид документа : Статья из журнала Шифр издания : 620.193/J 10 Автор(ы) : Tsygankova L. E., Vigdorovich V. I., Kichigin V. I., Kuznetsova E. Заглавие : Inhibition of carbon steel corrosion in media with H2S studied by impedance spectroscopy method Место публикации : Surface and Interface Analysis. - 2008. - Vol. 40, Issue 3-4. - С. 303-306 УДК : 620.193 ББК : 34.66 Предметные рубрики: Инженерное дело. Техника в целом Дефекты материалов и их выявление (контроль). Химические и физико-химические воздействия. Коррозия. Эрозия Ключевые слова (''Своб.индексиров.''): carbon steel--electrochemical impedance spectroscopy--equivalent circuits--hydrogen sulfide--organic solvents--carbon steel corrosion--protective effect--corrosion resistance Аннотация: Investigations of carbon steel corrosion were conducted in the model stratum water saturated with hydrogen sulfide. Inhibitive properties of AMDORIC-6, that is, mixture of 10% aminoparafine C12-C18 and 10% imidazoline dissolved in specific mixture of organic solvents, EM-10 (imino-bis-[(ethyl-2)-(C-alkyl of tall oil acids)-(1,3-diazocyclopenten-2)]) and EM-11 (1-(3,6-diazo-8-amine)-(C-alkyl of coco oil acids)-1,3-diazocyclopenten- 2) have been studied by the electrochemical impedance spectroscopy (EIS) and for comparison by the weight loss and polarization measurements. The inhibitor concentration was equal to 25-200mg/l. EIS measurements (60 kHz-10 mHz) were carried out at the corrosion potential (Ecor), anodic and cathodic polarization. The suggested equivalent circuit consists of four parallel branches and satisfactorily fits the experimental data obtained in the solutions with and without the inhibitors at Ecor. The observed values of double layer capacity Cdl 1 ?F/cm2 testify that multilayer adsorption of the inhibitors takes place on the electrode surface. It causes a retardation of the anodic reaction and slightly influences the cathodic one. Inhibitor efficiencies calculated on basis of impedance data qualitatively correlate with those obtained from the weight loss tests and the polarization measurements. Доп.точки доступа: Tsygankova, L. E.; Vigdorovich, V. I.; Kichigin, V. I.; Kuznetsova, E. |