Modelling of hydrogen permeation experiments in iron alloys: Characterization of the accessible parameters – Part II – The exit side

Vecchi, Lorenzo; Simillion, Hans; Montoya, R.; Laethem, Dries Van; Eeckhout, E. Van den; Verbeken, Kim; Terryn, Herman; Deconinck, Johan; Ingelgem, Yves Van

doi:10.1016/j.electacta.2017.12.173

Cited by 21 publications

(5 citation statements)

References 33 publications

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“…According to previous studies from alkaline aqueous solutions, these different anodic processes could be assigned to different oxidation processes. On one hand, the anodic process O 2 could be assigned to the oxidative desorption of hydrogen. − This hydrogen could be adsorbed at the surface of the electrode , but also absorbed in the bulk nickel phase. − On the other hand, O′ 2 could be attributed to the formation of Ni(OH) (ads) and Ni(OH) 2(ads) . ,, Since the potential was swept to highly negative values, an excess of OH – is formed, by water electrolysis at the interface and stabilized by the hydrogen bonds with the DES components. Thus, the assignment of anodic processes in alkaline solutions could be plausible in our case.…”

Section: Resultsmentioning

confidence: 99%

“…[57][58][59][60] This hydrogen could be adsorbed at the surface of the electrode 57,58 but also absorbed in the bulk nickel phase. [59][60][61] On the other hand, O' 2 could be attributed to the formation of Ni(OH) (ads) and Ni(OH) 2(ads) . 55,62,63 Since the potential was swept to highly negative values, an excess of OH − is formed, by water electrolysis, at the interface and stabilized by the hydrogen bonds with the DES components.…”

Section: )mentioning

confidence: 99%

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On the Control and Effect of Water Content during the Electrodeposition of Ni Nanostructures from Deep Eutectic Solvents

et al. 2018

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The electrodeposition of nickel nanostructures on glassy carbon was investigated in 1:2 choline chloride urea (1:2 ChCl-U) deep eutectic solvent (DES) containing different amounts of water. By combining electrochemical techniques, with ex-situ FE-SEM, HAADF-STEM and EDX, the effect of water content on the electrochemical processes occurring during nickel deposition was better understood. At highly negative potentials and depending on water content, Ni growth is halted due to water splitting and the formation of a mixed layer of Ni/NiO x (OH) 2(1−x)(ads). Moreover, under certain conditions, the DES components can also be (electro)chemically reduced at the electrode surface, blocking further 3D growth of the Ni NPs. Hence, a 2D crystalline Ni containing network can be formed in the inter-particle region. in the inter-particle region. Careful tuning of the water content leads to a fine control of the deposition potentials of Ni and the side reactions occurring at more negative potentials, giving the ability to control self-limiting growth and passivation phenomena. Supporting Information Available Water content. The 3 rd scan of the CVs of Figures 1, 2 and 3. Influence of stirring. Selected area electron diffraction (SAED).

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Section: Resultsmentioning

confidence: 99%

Section: )mentioning

confidence: 99%

On the Control and Effect of Water Content during the Electrodeposition of Ni Nanostructures from Deep Eutectic Solvents

et al. 2018

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“…Only the hydrogen that was absorbed and diffuses to the exit side was oxidized. Part of the adsorbed hydrogen recombined according to the Tafel and Heyrovsky reactions 29 (mitigated by adding the recombination poison thiourea). Another part was absorbed into the material but diffused out via the edges of II.…”

Section: Discussionmentioning

confidence: 99%

“…2. This setup matched that of a Devanathan-Stachurski 3,15,16,29 cell configuration without simultaneous hydrogen charging and discharging. The performed experiments are in line with other experiments where hydrogen charging and discharging is not performed simultaneously, such as the SKPFM performed within this work.…”

Section: Methodsmentioning

confidence: 96%

Influence of Thermal Oxide Layers on the Hydrogen Transport through the Surface of SAE 1010 Steel

Rubben

Baert

Depover

et al. 2022

J. Electrochem. Soc.

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Most research on the hydrogen embrittlement of steel dealt with the interaction of hydrogen with the metal bulk microstructural features, whereas the first contact with hydrogen-containing environments occurs at the metal surface. Steel (when un-polarized) is always covered with an oxide layer, varying in composition and thickness. The impact of the oxide layer on the hydrogen transport is, however, not fully understood. This study focused on the effect of controlled pre-formed thermal oxide layers at the exit side on the hydrogen transport through the surface of SEA 1010 steel, considering two distinct thermally produced oxide types as test cases. Results demonstrated that thermal oxides can greatly limit hydrogen diffusion, with bilayers (hematite/magnetite) having a greater effect compared to magnetite layers. Increased oxide thickness resulted also in greater limiting diffusion. The main objective of this manuscript is to provide experimental evidence concerning the effect of oxide layers on the hydrogen transport through steel. Model thermal oxide layers were used to emphasize the importance of considering the surface characteristics when investigating hydrogen transport through metallic components.

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“…To overcome this, many researchers (e.g. [97,144,156,168,174,175]) have developed expansions to Fick's laws to account for these parameters, adjusting parameter values to achieve better fits to the experimental data. However, as with any fitting of models to data, a certain degree of uncertainty will always remain.…”

Section: Galvanostatic Chargingmentioning

confidence: 99%

Hydrogen Embrittlement of Automotive Ultra-High-Strength Steels: Mechanism and Minimisation

Lelliott¹

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Automotive manufacturers are increasingly using ultra-high-strength steels in vehicle components to facilitate mass reduction via downgauging. Unfortunately, as the strength of steels increases, so does susceptibility to ‘hydrogen embrittlement’, a process in which ductility is significantly impaired by ingress of hydrogen. Mechanisms and environmental conditions by which this degradation occurs are not fully understood. In this work, 2 fully-ferritic, 2 fully-martensitic boron, and 2 ferrite-martensite dual-phase, ultra-high-strength steels, were assessed for susceptibility to hydrogen embrittlement via 3 key characteristics: firstly, with particular regard to hydrogen evolution under corrosion conditions, through well-established open circuit potential and potentiodynamic polarisation experiments. Exacerbation of hydrogen evolution through galvanic corrosion of a zinc coating was assessed by scanning vibrating electrode technique (SVET), and an attempt made to quantify increased risk of hydrogen evolution during crevice corrosion through a novel time-lapse photography experiment. Secondly, hydrogen diffusivity was assessed via permeation experiments. Finally, degradation in mechanical properties due to diffusing hydrogen was evaluated through slow strain rate tests (SSRT), whereby susceptibility to embrittlement was equated to reduction in ductility of hydrogen-charged test specimens. The fully-ferritic steels showed the greatest resistance to mechanical degradation, attributed to micro-alloy nano-precipitates within their microstructure acting as ‘traps’, leading to lower diffusivity compared to dual-phase steels of equivalent strength. Indeed, lower diffusivity showed a strong correlation with lower levels of embrittlement across all steels. 1000 MPa dual-phase steel showed the greatest degradation in mechanical properties, with fully-martensitic boron steels also found to be particularly susceptible. 1000 MPa dual-phase steel also showed the largest increase in hydrogen evolution reaction in response to polarisation, thought to result from the inherent potential difference between ferrite and martensite phases. Galvanic corrosion of a damaged zinc coating was found to polarise the exposed steel substrate, triggering sufficient hydrogen evolution to reach critical concentrations for embrittlement.

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Modelling of hydrogen permeation experiments in iron alloys: Characterization of the accessible parameters – Part II – The exit side

Cited by 21 publications

References 33 publications

On the Control and Effect of Water Content during the Electrodeposition of Ni Nanostructures from Deep Eutectic Solvents

On the Control and Effect of Water Content during the Electrodeposition of Ni Nanostructures from Deep Eutectic Solvents

Influence of Thermal Oxide Layers on the Hydrogen Transport through the Surface of SAE 1010 Steel

Hydrogen Embrittlement of Automotive Ultra-High-Strength Steels: Mechanism and Minimisation

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