Evaluation of Hydrogen Absorption into Iron by Alternating Current Responses in an Electrochemical Hydrogen Permeation Cell

Tada, Eiji; Nishikata, Atsushi

doi:10.2355/isijinternational.isijint-2015-414

Cited by 10 publications

(9 citation statements)

References 24 publications

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“…In the sinusoidal perturbation method, as opposed to the step method, [5][6][7][8][9] sinusoidal perturbation is superimposed on the experimental conditions at the entry-side cell, e.g., perturbation in current density, 5,7 polarization potential, 8 or electrolyte flow rate, 9 while the steady-state condition is maintained at the exit side to detect hydrogen. Sinusoidal perturbation induces sinusoidal signals in the hydrogen mass flux passing through the entry-side interface, which is observed as sinusoidal current at the entry electrode.…”

Section: Need For the Precise Measurement Of Hydrogen Penetrationmentioning

confidence: 99%

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Time-Dependent Measurement of Hydrogen Penetration into Iron Sheets from a Borate Buffer Solution Using FFT Analysis

Yamamoto

Kitagawa

Hasegawa

et al. 2018

J. Electrochem. Soc.

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Hydrogen penetration into iron sheets from a borate buffer solution (pH 8.4) was investigated using a modified Devanathan-Stachurski cell with flow paths. A sinusoidal perturbation method was applied to evaluate the hydrogen-diffusion coefficient D and its dependence on specimen thickness, polarization potential, and electrolyte flow rate. A fast Fourier transform (FFT) technique was employed to achieve automated derivation of the diffusion coefficient with precision and rapid screening of the experimental conditions. The obtained value of D increased with an increase in the specimen thickness or with an increase in the overpotential of the hydrogen evolution reaction, indicating the effect of a surface barrier layer-like oxide film on the hydrogen-entry side. On the other hand, D is not dependent on the electrolyte flow rate in the entry-side cell. From the viewpoint of hydrogen penetration, the properties of the barrier layer are almost immune to the flow rate, though it is affected by the polarization potential. The sinusoidal perturbation method combined with FFT allows the time-dependent evaluation of the hydrogen-penetration behavior in specimens with temporal changes, such as oxide-film formation and corrosion.

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Section: Need For the Precise Measurement Of Hydrogen Penetrationmentioning

confidence: 99%

“…The ratio of the exit-current and entry-current amplitudes was used to evaluate hydrogen-absorption efficiency. 8 It was also reported that the AC absorption ratio was more precise than the DC absorption ratio owing to the elimination of the contribution of background current.…”

Section: Need For the Precise Measurement Of Hydrogen Penetrationmentioning

confidence: 99%

Time-Dependent Measurement of Hydrogen Penetration into Iron Sheets from a Borate Buffer Solution Using FFT Analysis

Yamamoto

Kitagawa

Hasegawa

et al. 2018

J. Electrochem. Soc.

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“…The slope of − 240 mV/dec corresponds to the potential dependency of i per , which can be derived by assuming that Volmer reaction is the rate-determining step for the hydrogen evolution reaction (HER) on the steel surface. 28,29) Although the plots of i per are scattered, the potential dependency of i per measured in this study is roughly along the line. This result indicates that the hydrogen absorption into steel during the drying of an NaCl droplet is enhanced basically with a negative shift of E corr .…”

Section: Hydrogen Absorption Behavior Of Corroding Steelmentioning

confidence: 65%

Simultaneous Measurements of Corrosion Potential and Hydrogen Permeation Current in Atmospheric Corrosion of Steel

et al. 2019

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To investigate hydrogen absorption behavior into carbon steel during corrosion in an aqueous sodium chloride (NaCl) droplet, a simultaneous measurement system of the corrosion potential, E corr and hydrogen permeation current, i per was developed using the Kelvin probe (KP) technique and the Devanathan-Stachurski (DS) method, respectively. This system outputs the interrelation between corrosion and hydrogen absorption into steel throughout the drying process of an NaCl droplet. Our results showed that hydrogen absorption into the steel occurred when the E corr shifted in less noble direction under wet conditions, and ceased at a higher potential of E corr when the steel surface dried up. Based on the results of the transients of the i per , the amount of hydrogen absorbed during the drying of the NaCl droplet increased with NaCl concentration, which was attributed to the negative shift of the E corr. Furthermore, the amount of hydrogen absorbed within one wet-dry cycle changed with the number of cycles, due to the expansion of the corroded area and the formation of iron rust.

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“…Many researchers have investigated hydrogen evolution and hydrogen absorption reaction kinetics using the results of Tafel slopes for i entry and i per . 9,26,27) When assuming the reaction rate of hydrogen absorption reaction (Eq. (4)) is much faster than that of the Volmer reaction (Eq.…”

Section: Current Responses To Cathodic Polarizationmentioning

confidence: 99%

Effects of Ammonium Thiocyanate and pH of Aqueous Solutions on Hydrogen Absorption into Iron under Cathodic Polarization

et al. 2021

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To evaluate the susceptibility of steels to hydrogen embrittlement, it must be hydrogen charged and have its hydrogen content controlled before any mechanical testing. In this study, hydrogen permeation tests of an iron sheet were performed during potentiostatic hydrogen charging in various solutions containing ammonium thiocyanate to obtain a guideline for efficient hydrogen charging for a wide range of hydrogen contents. As the polarization potential shifted in the negative direction, the hydrogen permeation current increased before becoming almost constant. In all cases, besides when an aqueous sodium hydroxide solution was employed, the hydrogen permeation current increased due to the addition of ammonium thiocyanate. The effect of adding ammonium thiocyanate was enhanced as the aqueous solution pH was decreased. The hydrogen permeation current under various hydrogen charging conditions obtained in this study can be used as a reference for hydrogen charging of steels.

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Evaluation of Hydrogen Absorption into Iron by Alternating Current Responses in an Electrochemical Hydrogen Permeation Cell

Cited by 10 publications

References 24 publications

Time-Dependent Measurement of Hydrogen Penetration into Iron Sheets from a Borate Buffer Solution Using FFT Analysis

Time-Dependent Measurement of Hydrogen Penetration into Iron Sheets from a Borate Buffer Solution Using FFT Analysis

Simultaneous Measurements of Corrosion Potential and Hydrogen Permeation Current in Atmospheric Corrosion of Steel

Effects of Ammonium Thiocyanate and pH of Aqueous Solutions on Hydrogen Absorption into Iron under Cathodic Polarization

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