Application of electrochemical impedance spectroscopy to study hydrogen sulphide corrosion of steel and its inhibition: a review

Abstract

The review summarises the results of EIS analysis of sulphide films formed on steel during hydrogen sulphide and microbiologically induced corrosion, as well as inhibition of these processes. The issues of the effectiveness of anticorrosive protection of pipeline systems, the possibility of chemical modelling of biocorrosion activity of media, identifying the contribution of corrosion inhibitors to the barrier action of surface films on the corroded steel are considered as well. The information presented in the review will be of interest to employees of the anti-corrosion protection services of oil and gas producing and transporting companies.

Innovative Method for Coating of Natural Corrosion Inhibitor Based on Artemisia vulgaris

“…Y 0 is a constant phase element associated with the electronic double layer capacitance, created on the interface surface of the working and solution electrode; however, since it is not an ideal capacitance due to roughness and possible pores on the surface of the steel, with an ideality factor α, the gerischer element G, that is found only in the equivalent circuit of the treated steel, is an indication of the porosity of the organic coating with a porosity factor K, the gerischer element is necessary to explain the reaction of the organic coating, because the reactions between the two surfaces, the surface of the steel and the organic coating, cannot be distinguished from each other [ 28 ]. Finally, R p is the polarization resistance or corrosion resistance of the material [ 27 , 29 , 30 ]. This variable is the one of interest for the study.…”

Electrochemical Anodic Synthesis and Analysis of TiO2 Nanotubes for Biomedical Applications

“…The bode, phase angle, and Nyquist plots were shown in Figure 4 after immersion of 30 minutes in SBF solution. According to electrochemical theory, a current flow may also be obtained by charging and discharging the double layer at the interface or by oxidizing/reducing chemicals on the electrode or in solution [22,23]. The fitting model for the EIS analysis equivalent electrical simple model circuit (two times constant) is shown in Figure 4(c) as EEC.…”

Corrosion inhibition of copper in ferric chloride solutions with organic inhibitors

“…All five Nyquist plots reveal only one, slightly depressed, semicircle. Such non-perfect semicircles have been described by a semi-ellipse model and have been attributed, among others, to a non-ideal electrochemical behavior at the electrode/solution interphase due to heterogeneities at the metal surface [41][42][43] . No capacitive loops are apparent in the Nyquist plots.…”

“…5b. Similar equivalent circuits have been proposed to describe the corrosion of copper-based alloys and steels in sulfide-and chloride-containing environments, with and without inhibitors [41][42][43]45 . Table 4 summarizes the data extracted from the Nyquist plots and fitted to these equivalent circuits.…”