Spatially and Kinetically Resolved Mapping of Hydrogen in a Twinning-Induced Plasticity Steel by Use of Scanning Kelvin Probe Force Microscopy

Koyama, Motomichi; Bashir, Asif; Rohwerder, Michael; Merzlikin, Sergiy Vasil ́ović; Akiyama, Eiji; Tsuzaki, Kaneaki; Raabe, Dierk

doi:10.1149/2.0131512jes

Cited by 70 publications

(39 citation statements)

References 66 publications

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“…It is well known that it is very difficult to study hydrogen diffusion and trapping due to the size and mobility of this element. Based on recent works, it was decided in this work to use Scanning Kelvin Probe Force Microscopy (SKPFM) to detect hydrogen [15][16][17]. Thus, hydrogen penetration depth was measured by SKPFM in the four states after cathodic charging.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen diffusion and trapping in a low copper 7xxx aluminium alloy investigated by Scanning Kelvin Probe Force Microscopy

Oger

Lafouresse

Odemer

et al. 2017

Materials Science and Engineering: A

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A B S T R A C TThe susceptibility to hydrogen embrittlement (HE) of the 7046 aluminium alloy (AA 7046) was investigated. Samples of AA 7046 corresponding to different ageing temperature/time couples were hydrogenated by cathodic charging in a H 2 SO 4 solution. Scanning Kelvin Probe Force Microscopy (SKPFM) combined with global hydrogen amount measurements allowed apparent hydrogen diffusion coefficients (D app ) to be measured: the decrease of the D app values with the increase of the ageing duration was attributed to hydrogen trapping by hardening η' and η precipitates for the aged alloy. Additional SKPFM measurements were carried out on hydrogen charged samples after desorption at 25°C and combined with SEM observations of the fracture surfaces after tensile tests. Results showed that hydrogen could be trapped at the grain boundaries leading to brittle intergranular fracture. However, hardening precipitates could act as efficient trapping sites and reduce hydrogen trapping at the grain boundaries. Conclusion is that the most critical microstructural parameters for HE of AA 7046 correspond to the grain boundaries while ageing could contribute to improve the resistance to HE of the alloy by a well-controlled precipitation.

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Section: Introductionmentioning

confidence: 99%

Hydrogen diffusion and trapping in a low copper 7xxx aluminium alloy investigated by Scanning Kelvin Probe Force Microscopy

Oger

Lafouresse

Odemer

et al. 2017

Materials Science and Engineering: A

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“…The scanning Kelvin probe (SKP) [2][3][4] and scanning Kelvin probe force microscopy (SKPFM) [5,6] have been used to detect hydrogen in a range of materials and alloys. Scanning electrochemical microscopy (SECM) has recently been reported as a new technique to detect hydrogen in steel [7].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen mapping in an aluminum alloy using an alternating current scanning electrochemical microscope (AC-SECM)

Lafouresse

Bonfils-Lahovary

Laffont

et al. 2017

Electrochemistry Communications

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. A B S T R A C TMeasurements using an alternating current scanning electrochemical microscope (AC-SECM) were performed on a 2024 aluminum alloy pre-charged with hydrogen. A gradient in AC current magnitude was observed over several hundreds of microns on the side perpendicular to the charging side. After heat treatment at 130°C for 2 h, the current gradient disappeared. Comparison with scanning Kelvin probe force microscopy (SKPFM) measurements confirmed that the increase in AC current magnitude observed with AC-SECM was due to the presence of hydrogen in the material. Fitting of localized impedance spectra with a suitable equivalent circuit showed the influence of H on the corrosion rate. AC-SECM is thus a powerful new method to detect hydrogen and study its effect on corrosion at the micrometer scale.

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“…The KP-based potentiometric method for the detection of hydrogen was so far mainly used for hydrogen mapping [37][38][39][41][42][43]. However, it was already shown that this method in principle can be also used for permeation measurements [37,38].…”

Section: Theoretical Background: Potentiometric Hydrogen Electrode Mementioning

confidence: 99%

On the robustness of the Kelvin probe based potentiometric hydrogen electrode method and its application in characterizing effective hydrogen activity in metal: 5 wt. % Ni cold-rolled ferritic steel as an example

Krieger

Rohwerder

2019

Science and Technology of Advanced Materials

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Quantitative detection of hydrogen in metal is important in providing a better basis for fundamental investigations of hydrogen embrittlement and hydrogen-related corrosion phenomena. Thermal desorption spectroscopy (TDS) has long been used in characterizing different hydrogen traps inside materials. However, in TDS measurements, the diffusible hydrogen (hydrogen at interstitial sites and weakly bound hydrogen) is usually not detected. The Davanathan-Starchurski permeation technique can cover this shortage. However, for such experiments, the stability of the palladium at the exit side, i.e. in aqueous solution under high potential polarization is an important issue. Alternatively, a Kelvin probe-based (KP-based) potentiometric method developed a few years ago has shown to allow quantitative determination of hydrogen in metal. This method is based on measuring the hydrogen electrode potential on the Pd-coated surface. The aim of this work is to check the reliability of this method and to demonstrate its potential applications in determining the hydrogen amount distributed in both shallow and deep traps in steel. The results reveal that different crystallographic orientation, grain shapes and grain sizes of the deposited palladium film (in the range of variation in this work) do not cause relevant effects on the KP-based hydrogen detection. It is shown in this work that the time lag and permeation rate derived from the permeation curves obtained by this method show a very good reliability and the calculated hydrogen amount shows a good agreement with TDS results. 5 wt.% Ni ferritic steel is used as a model material in this work.

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Spatially and Kinetically Resolved Mapping of Hydrogen in a Twinning-Induced Plasticity Steel by Use of Scanning Kelvin Probe Force Microscopy

Cited by 70 publications

References 66 publications

Hydrogen diffusion and trapping in a low copper 7xxx aluminium alloy investigated by Scanning Kelvin Probe Force Microscopy

Hydrogen diffusion and trapping in a low copper 7xxx aluminium alloy investigated by Scanning Kelvin Probe Force Microscopy

Hydrogen mapping in an aluminum alloy using an alternating current scanning electrochemical microscope (AC-SECM)

On the robustness of the Kelvin probe based potentiometric hydrogen electrode method and its application in characterizing effective hydrogen activity in metal: 5 wt. % Ni cold-rolled ferritic steel as an example

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