Spatial determination of diffusible hydrogen concentrations proximate to pits in a Fe–Cr–Ni–Mo steel using the Scanning Kelvin Probe

Schaller, Rebecca; Scully, John R.

doi:10.1016/j.elecom.2015.12.002

Cited by 37 publications

(22 citation statements)

References 31 publications

(40 reference statements)

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“…For hydrogen visualization, most of the recent technological efforts have been focused on three specific topics: quantification of the local hydrogen content [5][6][7], multi-scale hydrogen distribution observations [8,9], and kinetically resolved hydrogen mapping [10][11][12]. In recent studies [12][13][14], scanning Kelvin probe force microscopy (SKPFM) has been reported to enable sequential kinetic analysis of microstructural hydrogen diffusion/segregation.…”

mentioning

confidence: 99%

In situ observations of silver-decoration evolution under hydrogen permeation: Effects of grain boundary misorientation on hydrogen flux in pure iron

et al. 2017

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An in situ silver decoration technique using a light microscope was developed. Hydrogen was introduced from the bottom surface of an annealed pure iron specimen, and its top surface was covered with a chemical solution containing silver ions. Samples were exposed for sufficient time for hydrogen permeation to occur from the back to the top surface. The resultant in situ silver decoration visualized that the hydrogen flux through low-angle grain boundaries is lower than that observed at high-angle grain boundaries. The in situ silver decoration technique can be used for kinetic analysis of solute hydrogen in ferritic iron and steels.

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confidence: 99%

In situ observations of silver-decoration evolution under hydrogen permeation: Effects of grain boundary misorientation on hydrogen flux in pure iron

et al. 2017

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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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“…At 20 o C and H 2 S partial pressure (p H2S ) of 0.83 kPa, it was reported that fatigue crack growth was controlled by hydrogen diffusion at pH = 7, whereas some characteristics of stress corrosion cracking were observed at pH = 12 [21][22][23]. A spatial mapping study using a Scanning Kelvin Probe at the sub-mm scales by Schaller and Scully found a close correlation between pit formation and high hydrogen production in acidic corrosion [24]. Electrochemical corrosion reactions have a significant impact on the initiation and propagation of pits and cracking.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Corrosion of Ultra-high Strength Carbon Steel in Alkaline Brines Containing Hydrogen Sulfide

Feng

Beck

Ziomek-Moroz

et al. 2016

Electrochimica Acta

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Electrochemical corrosion of ultra-high strength carbon steel UD-165 was investigated using in-situ electrochemical techniques in H 2 S-containing alkaline brines (5 wt% NaCl; pH 7.9, 10.7, and 12.4) with four H 2 S partial pressures (p H2S) from 0 to 69 kPa at 85 °C. The effects of pH and p H2S were studied in terms of corrosion rate (CR), reaction mechanism, and corrosion products considering the Fe dissolution reactions with HCO 3-(aq), OH-(aq), and HS-(aq). While CR generally decreased at higher pH and increased at higher p H2S , both accelerating and inhibiting effects of H 2 S on CR were observed. High CR at pH 10.7 correlated with a high ratio of HS-(aq) to the total concentration of reactive anions. The

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Spatial determination of diffusible hydrogen concentrations proximate to pits in a Fe–Cr–Ni–Mo steel using the Scanning Kelvin Probe

Cited by 37 publications

References 31 publications

In situ observations of silver-decoration evolution under hydrogen permeation: Effects of grain boundary misorientation on hydrogen flux in pure iron

In situ observations of silver-decoration evolution under hydrogen permeation: Effects of grain boundary misorientation on hydrogen flux in pure iron

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

Electrochemical Corrosion of Ultra-high Strength Carbon Steel in Alkaline Brines Containing Hydrogen Sulfide

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