Investigation of hydrogen adsorption–absorption on iron by EIS

Amokrane, N.; Gabrielli, C.; Ostermann, E.; Perrot, Hubert

doi:10.1016/j.electacta.2007.07.047

Cited by 15 publications

(3 citation statements)

References 29 publications

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“…In oxygen‐free PS, hydrogen is inevitably involved at the first stage29 and obviously predominate the dissolution. Hydrogen ions migrate and get adsorbed onto the sublayer of the samples [Figure 7(a,b)], and an electrochemical desorption Volmer–Heyrovsky model on hydrogen evolution is applied here owing to the charge transfer in the intermediate hydrogen adsorption‐absorption (H ads and H abs ) pattern 30. In comparison to MC‐Fe [Figure 7(a)], NC‐Fe [Figure 7(b)], lack of defects and groove‐like structures, would postpone the first stage of hydrogen adsorption and prevent the further diffusion of hydrogen into the bulk metal body due to its isotropic microstructure,31 thus slows down the corrosion rate.…”

Section: Discussionmentioning

confidence: 99%

Surface chemistry of bulk nanocrystalline pure iron and electrochemistry study in gas‐flow physiological saline

Nie

Zheng

2012

J Biomed Mater Res

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Conventional microcrystalline pure iron (MC-Fe) becomes a new candidate as biodegradable metals, which has the insufficient physical feature and inferior biodegradation behavior. Novel bulk nanocrystalline pure iron (NC-Fe) was fabricated via equal channel angular pressing technique in the present work to overcome these problems. The contact angle test with water and glycerol droplets shows a smaller angle (though >90°) of NC-Fe than that of MC-Fe, which implies a lower surface energy of NC-Fe. The surface roughness of NC-Fe increased greatly than that of MC-Fe. A further comparative study of corrosion and electrochemistry performance between NC-Fe and its original MC-Fe was investigated in physiological saline with different dissolved oxygen concentration, aiming to in vitro simulate the corrosion process of coronary stent occurred in physiological environment. The electrochemical impedance spectra analysis and anodic polarization measurements indicated that the NC-Fe exhibited higher corrosion resistance than that of the MC-Fe; meanwhile obvious enhanced corrosion resistance with the decrement of dissolved oxygen concentration was observed. Related equivalent circuit model and surface reconstruction process were further discussed, and the degradation mechanism of the MC-Fe and NC-Fe were finally established.

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Section: Discussionmentioning

confidence: 99%

Surface chemistry of bulk nanocrystalline pure iron and electrochemistry study in gas‐flow physiological saline

Nie

Zheng

2012

J Biomed Mater Res

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“…The hydrogen atoms produced by the cathodic reaction are adsorbed on the steel surface, and a small quantity of the adsorbed atoms are absorbed into the steel matrix. [4][5][6] The accumulation of hydrogen in steel results in delayed fracture, and the susceptibility of HE increases with an increase in the strength of steels. 7) The material design to prevent high strength steel bolts from delayed fracture has been studied: vanadium-containing steels have been reported to have a high resistance to HE.…”

Section: Introductionmentioning

confidence: 99%

Detection of Hydrogen Distribution in Pure Iron Using WO<sub>3</sub> Thin Film

et al. 2018

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The usefulness of a new approach to detecting the distribution of hydrogen absorbed into pure iron utilizing a WO 3 thin film was demonstrated in this study. A WO 3 film with an electrochromic property was formed on the hydrogen detection side of iron sheet by reactive magnetron sputtering. After hydrogen was absorbed into the iron sheet by cathodic polarization on the hydrogen absorption side, the color of the WO 3 film corresponding to the electrode area changed from light blue to dark blue. The WO 3 film was found to reflect the distribution of hydrogen absorbed into the pure iron sheet. No color change occurred on the hydrogen detection side unless a Pd film was inserted between the WO 3 film and the iron specimen. The reflectance of the WO 3 film in the visible region was reduced by hydrogen charging, with a marked reduction in the RGB color values after the start of hydrogen charging. The results of an XPS analysis suggested that the phase transition from WO 3 to H x WO 3 resulted in the color change of the WO 3 film during hydrogen charging. Because of the simplicity of this approach to detecting hydrogen compared to other hydrogen detection methods, it is expected to have various applications.

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“…Then, almost all of the hydrogen atoms are removed from the surface as a result of hydrogen evolution, whereas a trace amount of it absorbed into the steel. 3 Thus, the activation of hydrogen evolution reaction induces the enhancement of the hydrogen entry into the steels. In practical use of the steels, some corrosion protection such as Zn coatings and cathodic protections are applied normally.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Entry into Pure Iron Treated by Plasma Nitriding

2017

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In order to prevent hydrogen entry into steels, the effect of the plasma nitriding treatment on the hydrogen permeation behavior of pre irons was investigated in this study. The plasma nitriding was performed in a nitrogen-hydrogen atmosphere composed of 75 % N 2 -25 % H 2 at 400 ºC and 600 Pa for 3.6 ks. The nitrogen compound layer was composed of -Fe 2-3 N and '-Fe 4 N phases, and its thickness was ca. 2.8 m. The hydrogen permeation tests revealed that the hydrogen absorption efficiency of the nitrided pure iron was one fiftieth that of the untreated one. In addition, the nitrided pure iron had a lower diffusion coefficient than the untreated one. The nitrided layer acts as an effective barrier against the hydrogen entry and diffusion in pure iron.

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Investigation of hydrogen adsorption–absorption on iron by EIS

Cited by 15 publications

References 29 publications

Surface chemistry of bulk nanocrystalline pure iron and electrochemistry study in gas‐flow physiological saline

Surface chemistry of bulk nanocrystalline pure iron and electrochemistry study in gas‐flow physiological saline

Detection of Hydrogen Distribution in Pure Iron Using WO<sub>3</sub> Thin Film

Hydrogen Entry into Pure Iron Treated by Plasma Nitriding

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