التفاصيل البيبلوغرافية
| العنوان: |
TEMPERATURE EFFECT ON THE ELECTROCHEMICAL IMPEDANCE SPECTRA IN PRESENCE OF QUATERNARY AMMONIUM BROMIDES IN ACID MEDIA. |
| المؤلفون: |
Popova, Angelina K.1 apopova@uctm.edu, Vasilev, Aleksej A.2 |
| المصدر: |
Journal of Chemical Technology & Metallurgy. 2023, Vol. 58 Issue 1, p116-124. 9p. |
| مصطلحات موضوعية: |
*TEMPERATURE effect, *AMMONIUM bromide, *STEEL corrosion, *ELECTROCHEMICAL analysis, *MILD steel, *IMPEDANCE spectroscopy, *ELECTROLYTIC corrosion |
| مستخلص: |
The inhibitive properties of two quaternary ammonium bromides are studied in respect to mild steel corrosion in 1 M HCl in the temperature range of 30oC - 60oC. Both compounds are synthesized for this particular purpose and are investigated as inhibitors for the first time. Their inhibitive properties are verified by two methods - those of the alternating current method of the electrochemical impedance spectroscopy (EIS) and the direct current method of the polarization resistance (Rp-method). It is found that the temperature affects the frequency dispersion of the interface impedance in presence of both compounds. Two structural models are advanced describing the impedance data. They present the processes at mild steel/1 M HCl + an inhibitor interface at various temperature values. The quantitative analysis of the electrochemical impedance spectra is based on the physical model of electrochemical corrosion with hydrogen depolarization controlled by a charge transfer step. The double layer capacitance is modeled by a frequency distributed element Constant Phase Element (CPE). The adsorption capacitance is also modeled by CPE. The values of the electrochemical parameters referring to both inhibitors in the temperature interval studied are calculated on the ground of the models derived. The values of the resistances obtained by EIS method are compared to those of the polarization resistance RPDC. A very good coincidence is observed. The inhibitive effect of the compounds studied is estimated. A tendency of increase of the protective effect with temperature increase is observed. Both compounds have very good and similar protective properties. Those of the oxazole compound are slightly better. [ABSTRACT FROM AUTHOR] |
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