In-situ electrochemical impedance measurements of corroding stainless steel in high subcritical and supercritical water

Macák, Jan; Novotný, Radek; Sajdl, Petr; Bystrianský, V.; Tůma, L.; Novák, Michal

doi:10.1016/j.corsci.2019.01.017

Cited by 14 publications

(5 citation statements)

References 31 publications

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“…The effective nonscattering environment capacity can be determined from their values using the equation for the normal distribution of the time constant, which was proposed by Hsu and Mansfeld . This equation was also used for the spatial capacity characterization in supercritical water From the R and C eff parameters, information about the environment (fuel), such as the resistivity and relative permittivity, can be obtained using the cell constant. However, polarization resistance, which informs one about the instantaneous corrosion rate, cannot be obtained.…”

Section: Results and Discussionmentioning

confidence: 99%

Corrosion Aggressiveness of Ethanol–Gasoline and Butanol–Gasoline Blends on Steel: Application of Electrochemical Impedance Spectroscopy

et al. 2022

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Nowadays, bioalcohols are promising renewable alternative fuels to gasoline in road transport. One of the most crucial issues of many alcohol fuels is limited information about their compatibility with fuel line materials such as steel. This study aims to evaluate the corrosion aggressiveness of alcohol–gasoline blends to mild steel and stainless steel. Two alcohol–gasoline blend types were tested: ethanol–gasoline and butanol–gasoline blends. These fuels were tested in pure (noncontaminated) and contaminated forms. The corrosion studies were performed using electrochemical impedance spectroscopy in a planar, two-electrode arrangement. We found out that stainless steel was highly corrosion resistant in all of the tested fuels, while mild steel exhibited very good corrosion resistance only in pure alcohol–gasoline blends. However, the corrosion resistance of mild steel decreased considerably after contamination, especially in the case of butanol–gasoline blends, and the highest corrosion rate of mild steel was measured in the contaminated B85 fuel with 6 vol % water having the lowest value of polarization resistance of 128 kΩ cm2. Furthermore, pitting corrosion was observed in B40 and higher fuels even at short exposure times, and, once being contaminated, butanol–gasoline blends were found to be more aggressive to mild steel.

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Section: Results and Discussionmentioning

confidence: 99%

Corrosion Aggressiveness of Ethanol–Gasoline and Butanol–Gasoline Blends on Steel: Application of Electrochemical Impedance Spectroscopy

et al. 2022

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“…In general, the deviation of the measured capacity from the ideal value (capacity) increases with the decreasing n values. In the Nyquist diagram, this fact can be exhibited by the shifting of the semicircle. ,, As a result of the high serial resistance R s (high-frequency response) that is associated with the low conductivity of an environment and the geometric arrangement of a measuring cell, it was necessary to calculate the C eff values from eq , where R s is the serial resistance, Q dl is the double-layer response, and R p is the polarization resistance. …”

Section: Resultsmentioning

confidence: 99%

Efficiency of Steel Corrosion Inhibitors in an Environment of Ethanol–Gasoline Blends

et al. 2019

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Ethanol produced from renewable sources (i.e., bioethanol) is a first-generation biofuel that is currently being added as a biocomponent into gasolines. Mixtures of ethanol and gasoline are designated as ethanol–gasoline blends (EGBs). Ethanol has high polarity and moisture affinity, which considerably influence the properties of the resulting EGBs including their aggressiveness to many metallic and nonmetallic materials. The corrosion aggressiveness of EGBs can be minimized by suitable corrosion inhibitors. In this study, we tested three different corrosion inhibitors on mild steel in the environment of aggressive E10, E25, E60, and E85 fuels. The inhibitors tested were diethylene triamine (DETA) and two mixed inhibitors containing propargyl alcohol, dibenzyl sulfoxide, and octadecyl amine. To study the efficiency of the corrosion inhibitors, we used static and dynamic corrosion tests and electrochemical measurements including impedance spectroscopy and potentiodynamic polarization. The highest corrosion aggressiveness on mild steel was observed for the E60 fuel. The highest inhibitory efficiency was, for all the fuels tested, observed for the DETA inhibitor. For the DETA concentration of 100 mg·L –1 , the inhibitory efficiency in the E60 fuel was determined to be around 98%.

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“…In addition, the circulating flow loop with a hydrodynamic autoclave designed in the research platform is consistent with most engineering practical application scenarios. The reference electrode is the core component of the electrochemical research platform, which mainly includes various reference electrodes such as hydrogen electrodes, YSZ electrodes, metal/metal oxide electrodes, external pressure balance reference electrodes, etc., especially the YSZ electrode, which has been successfully applied in high-temperature conditions exceeding 500 • C [1,106]. These contents are extensive and complex and will be further explored in another review article.…”

Section: Research Platform Of In Situ Electrochemical Corrosion Testingmentioning

confidence: 99%

Corrosion Monitoring Techniques in Subcritical and Supercritical Water Environments

Li,

Bai,

Xing

et al. 2024

Applied Sciences

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A series of advanced equipment exposed to sub-/supercritical water environments at high temperatures, high pressures, and extreme water chemistry with high salt and dissolved oxygen content faces serious corrosion problems. Obtaining on-site corrosion data for typical materials in harsh environments is crucial for operating and maintaining related equipment and optimizing various corrosion prediction models. First, this article introduces the advantages and disadvantages, usage scenarios, and future development potential of several in situ monitoring technologies, including ultrasonic thickness measurement, the infrared thermography method, microwave imaging, eddy current detection, and acoustic emission. Considering the importance of electrochemical corrosion data in revealing microscale and nanoscale corrosion mechanisms, in situ testing techniques such as electrical resistance probes, electrochemical corrosion potential, electrochemical impedance spectroscopy, and electrochemical noise that can be applied to sub-/supercritical water systems were systematically discussed. The testing platform and typical data obtained were discussed with thick and heavy colors to establish a mechanical prediction model for corrosion behavior. It is of great significance to promote the development of corrosion monitoring techniques, such as breaking through testing temperature limitations and broadening the industrial application scenarios and maturity.

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In-situ electrochemical impedance measurements of corroding stainless steel in high subcritical and supercritical water

Cited by 14 publications

References 31 publications

Corrosion Aggressiveness of Ethanol–Gasoline and Butanol–Gasoline Blends on Steel: Application of Electrochemical Impedance Spectroscopy

Corrosion Aggressiveness of Ethanol–Gasoline and Butanol–Gasoline Blends on Steel: Application of Electrochemical Impedance Spectroscopy

Efficiency of Steel Corrosion Inhibitors in an Environment of Ethanol–Gasoline Blends

Corrosion Monitoring Techniques in Subcritical and Supercritical Water Environments

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