Investigation of Kelvin probe force microscopy efficiency for the detection of hydrogen ingress by cathodic charging in an aluminium alloy

Larignon, Céline; Alexis, Joël; Andrieu, Éric; Lacroix, Loïc; Odemer, Grégory; Blanc, Christine

doi:10.1016/j.scriptamat.2012.11.026

Cited by 47 publications

(45 citation statements)

References 19 publications

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“…The potential gradient was observed at a similar distance as for the current gradient, i.e.~400 μm. The potential gradient observed in SKPFM for H-charged AA 2024 samples was confirmed to be due to hydrogen in an independent gas fusion analysis [13], and also in secondary ion mass spectroscopy (SIMS) measurements by Larignon et al [16]. The good agreement between the distances over which the current and potential gradients are observed confirmed that the observed | i ac | increase for small x is due to the presence of hydrogen.…”

Section: Hydrogen Insertionmentioning

confidence: 55%

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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Section: Hydrogen Insertionmentioning

confidence: 55%

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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“…For all metallurgical states, a ∆V gradient was observed between the charged surface and the hydrogenfree core of the coupons. According to previous works, this gradient can be related to the presence of hydrogen that modifies the electronic output work [15]. Although no clear mechanism explaining the role of hydrogen on the electronic output work was established, it was assumed that hydrogen distorts the metallic lattice leading to the variations observed.…”

Section: Hydrogen Diffusion Investigationmentioning

confidence: 97%

“…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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“…27) Recent study showed its capacity in revealing the mechanism of stress corrosion cracking in austenitic stainless 28) and even hydrogen embrittlement (HE) in aluminium alloys. 29) Thermoelectric power (TEP) is highly sensitive to crystal defects such as dislocations, solute atoms and inclusions. 30) Few results of TEP study on hydrogen in steel can be found in the literature.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Traps and Hydrogen Induced Cracking in 20CrMo Steel

Zhu

Yao

et al. 2017

ISIJ Int.

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The hydrogen trapping sites of commercial 20CrMo steel samples with electrochemically charged hydrogen were characterized by thermoelectric power (TEP) and scanning Kelvin probe force microscope (SKPFM). A surface potential drop of about 190 mV was found for the globular MnS inclusion and 150 mV for the elongated one due to the hydrogen absorption of MnS inclusions. Similar to thermal desorption measurement, TEP is a potential method in analyzing hydrogen traps of solid solution, dislocations and irreversible traps. The fracture morphology and hydrogen induced cracking can be explained by combined hydrogen embrittlement mechanisms. Although hydrogen induced cracks are found to initiate at the elongated inclusions, only longitudinal cracks were observed in this study which is not detrimental to the embrittlement.

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Investigation of Kelvin probe force microscopy efficiency for the detection of hydrogen ingress by cathodic charging in an aluminium alloy

Cited by 47 publications

References 19 publications

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

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

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

Hydrogen Traps and Hydrogen Induced Cracking in 20CrMo Steel

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