Electrochemical Impedance Spectroscopy Investigation of Alloy Inconel 718 in Molten Salts at High Temperature

Sánchez-Carrillo, M.; Sandoval-Jabalera, R.; Martínez‐Villafañe, A.

doi:10.1016/s1452-3981(23)15005-x

Cited by 43 publications

(3 citation statements)

References 11 publications

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“…Generally, when a nonideal frequency response is obtained, distributed circuit elements can be employed in the equivalent circuits. The constant phase element (CPE) is the most widely used and has a noninteger power dependence on the frequency . Therefore, in this study, the equivalent circuit shown in Figure S9 was used to investigate the impedance spectra, where R s represents the solution resistance, R ct the charge-transfer resistance, and CPE the interfacial capacitance.…”

Section: Resultsmentioning

confidence: 99%

“…The constant phase element (CPE) is the most widely used and has a noninteger power dependence on the frequency. 56 Therefore, in this study, the equivalent circuit shown in Figure S9 was used to investigate the impedance spectra, where R s represents the solution resistance, R ct the charge-transfer resistance, and CPE the interfacial capacitance. The values of R s and R ct obtained from EIS fitting and IE% are listed in Table 6 .…”

Section: Resultsmentioning

confidence: 99%

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Tunable Anticorrosive Effects of Newly Synthesized Benzothiazole Azo Dyes by Potassium Iodide Synergism for Carbon Steel in 1 M HCl: Combined Experimental and Theoretical Studies

et al. 2023

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Herein, we synthesized three novel benzothiazole azo dyes, including 4-chloro-2-(4-methyl-benzothiazol-2-ylazo)-phenol (CMBTAP), 1-(6-chloro-benzothiazol-2-ylazo)-naphthalen-2-ol (CBAN), and 2-(6-chloro-benzothiazol-2-ylazo)-4-methyl-phenol (CBAMP), and investigated their corrosion inhibition effect on carbon steel. The dyes were characterized by Fourier transform infrared spectroscopy, 1H nuclear magnetic resonance (NMR), 13C NMR, and mass spectroscopy. Weight loss, electrochemical impedance spectroscopy, and potentiodynamic polarization measurements were performed to investigate the corrosion inhibition effect of the dyes on carbon steel in a 1.0 M HCl solution. The synergistic effects of the dyes with potassium iodide (KI) were also investigated. The inhibition efficiency (IE%) was enhanced by increasing the dose of the dyes (1 × 10–5 to 2 × 10–4 M) and decreased as the temperature increased from 25 to 45 °C. The addition of KI to a 1.0 M HCl solution containing the dyes improved the performance and efficiency as iodide ions promoted the formation of inhibition films on the surface of carbon steel. The dyes are mixed-type inhibitors, according to Tafel polarization. Scanning electron microscopy and energy dispersive X-ray analysis were used to evaluate the surface morphology of carbon steel sheets. Quantum theory calculations were utilized to evaluate the relationship between the dyes’ chemical structures and their inhibitory efficiency, which confirmed the experimental results. The calculations revealed that the dyes have low energy gap and Milliken and Fukui indices. Among all of the dyes, CMBTAP showed the highest adsorption energy. The corrosion IE was in the order CMBTAP > CBAMP > CBAN.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Tunable Anticorrosive Effects of Newly Synthesized Benzothiazole Azo Dyes by Potassium Iodide Synergism for Carbon Steel in 1 M HCl: Combined Experimental and Theoretical Studies

et al. 2023

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“…The EEC fitting parameters are described in Tables 3-5. The use of EEC suggests that the passive film contains porosities in which the electrolyte penetrates [39,46]. The expression of the total impedance of the EEC is given by Equation (4).…”

Section: Spontaneous Growth Of Passive Films On Stainless Steels and ...mentioning

confidence: 99%

Passive Films Formed on Fe- and Ni-Based Alloys in an Alkaline Medium: An Insight into Complementarities between Electrochemical Techniques and Near-Field Microscopies (AFM/SKPFM)

Benaioun,

Moulayat,

Hakiki

et al. 2023

Applied Sciences

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This study investigates the natural passivation process of two types of stainless steels (AISI 316 and AISI 304) and a nickel-based alloy (Inconel 600) as a function of immersion time in an alkaline medium. As shown by Atomic Force Microscopy (AFM), the oxide film growth on each substrate is only influenced by trenches formed during the polishing step and does not depend on the chemical composition. The evolution of EIS measurements is explained by this growth mode. After 3 days of immersion, the formed film constitutes a protective barrier against alloy dissolution, as shown by Scanning Kelvin Probe Microscopy (SKPFM).

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High temperature corrosion and electrochemical behavior of HVOF sprayed Inconel 718 coating using an innovative device: HTCMD

Galedari

Jazi

Azarmi

et al. 2017

Materials & Corrosion

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Inconel 718 is one of the most commonly used nickel‐based superalloy materials in petroleum industry due to its high temperature mechanical properties and corrosion resistance. Generally, corrosion resistance assessment of materials at high temperature condition is a challenging task and most of the previous studies in this area were based on estimation of weight‐loss in the sample, which cannot provide accurate results, and it could be very time‐consuming. In this study, a high temperature corrosion measurement device (HTCMD) was used to evaluate electrochemical behavior of HVOF deposited Inconel 718 coating in 3.5 wt% NaCl solution at elevated temperatures. EIS and potentiodynamic polarization results revealed very low corrosion rate of the Inconel 718 coating. Materials characterization by SEM, XRD, and EDS indicated formation of chromium oxide rich unstable passive layer resulted in localized protection of superalloy material that was not sufficient to provide corrosion protection for the entire surface, during the service at high temperature condition.

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Electrochemical Impedance Spectroscopy Investigation of Alloy Inconel 718 in Molten Salts at High Temperature

Cited by 43 publications

References 11 publications

Tunable Anticorrosive Effects of Newly Synthesized Benzothiazole Azo Dyes by Potassium Iodide Synergism for Carbon Steel in 1 M HCl: Combined Experimental and Theoretical Studies

Tunable Anticorrosive Effects of Newly Synthesized Benzothiazole Azo Dyes by Potassium Iodide Synergism for Carbon Steel in 1 M HCl: Combined Experimental and Theoretical Studies

Passive Films Formed on Fe- and Ni-Based Alloys in an Alkaline Medium: An Insight into Complementarities between Electrochemical Techniques and Near-Field Microscopies (AFM/SKPFM)

High temperature corrosion and electrochemical behavior of HVOF sprayed Inconel 718 coating using an innovative device: HTCMD

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