On the electrochemical permeation measurements of hydrogen in nickel undergoing plastic deformation

Otsuka, Rikuro; Isaji, M.

doi:10.1016/0036-9748(81)90178-2

Cited by 20 publications

(8 citation statements)

References 5 publications

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“…Kurkela and Latanision 4) found an increase of the apparent diffusivity by up to five orders of magnitude for nickel. Otsuka and Isaji 5) also observed similar phenomena for nickel. Frankel et al observed direct evidence for dislocation transport of hydrogen in the easy glide region of deformation for single crystals of nickel.…”

Section: Introductionsupporting

confidence: 54%

“…Although there are some contradictions among literatures about the role of dislocations on the transport of hydrogen, the enhanced transport in nickel is the dominant result, [2][3][4][5][6] while enhanced trapping in bcc materials is the main phenomenon. [9][10][11] In fact, when a material is deformed, enhanced trapping and enhanced transport by dislocation can both play a role, no matter it is fcc or bcc, but one may overcome another.…”

Section: Effect Of Dynamic Loading On Hydrogen Permeationmentioning

confidence: 99%

“…However, even for the same kind of materials, the conclusions deduced from the individual results obtained by researchers are different. 4,5,7) When the materials are deformed, two competing effects, namely, enhanced trapping and enhanced transport by dislocation can both play a role, but one may overcome another. In this paper, the results of an experimental study on the effect of straining on hydrogen transport in iron were reported and a reasonable discussion was given.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Mechanical Deformation on Permeation of Hydrogen in Iron

et al. 2003

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Section: Introductionsupporting

confidence: 54%

Section: Effect Of Dynamic Loading On Hydrogen Permeationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Mechanical Deformation on Permeation of Hydrogen in Iron

et al. 2003

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“…The composition 60Ni-40Nb is very close to one of the eutectic compositions in the Ni-Nb phase diagram (13), so glasses of this composition are readily formed, though a wider compositional range is possible; Giessen et al (14) have reported the melt spinning of Ni-Nb glasses containing 25-60 a/o Ni. Glassy Ni-Nb alloys were first prepared in 1967 (15), and since then they have been well characterized.…”

Section: J E~ectrochem Soc: Electrochemical Science and Technologymentioning

confidence: 97%

Accelerated Evolution of Hydrogen on Freshly Generated Metal Surfaces in Aqueous Solution

Burstein

Kearns

1984

J. Electrochem. Soc.

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Data have been obtained which describe quantitatively the rate of evolution of hydrogen on freshly generated surfaces of Fe, Cr, and their binary alloys. At low electrode potentials, creation of the new metal surface causes large acceleration of the rate of hydrogen evolution. The succeeding decay of cathodic current with time is relatively small; long after its creation, the new surface remains catalytically active towards hydrogen evolution provided the potential remains low. The kinetics of each stage of the process are defined and presented as a function of the metal composition.The scratched rotating disk electrode has proved a valuable probe for the investigation of the rapid initial reactions which occur when metal surfaces are generated in aqueous electrolytes under potential control (1-7). Efforts have so far been focused on the elucidation of anodic processes occurring in a range of metal/ electrolyte systems. These have included measurements of the rapid initial rates of anodic reactions (1-9), kinetics of oxide film growth (8,9), and the effects of anions on these (1, 2). Although cathodic current transients have been documented at sufficiently low potentials (2-9), these have not been analyzed in detail.Preliminary work on the scratched chromium electrode at low electrode potential in alkaline solution has shown that the hydrogen evolution reaction can be accelerated on scratching, and that the accelerated rate of reaction can continue for periods long after the scratching process is complete (10). The present work sets out the results of similar studies of iron, chromium, and a range of their binary alloys in a potential range where scratching gives rise to a net cathodic current due to the hydrogen evolution reaction occurring upon the scratch surface.The phenomenon of enhanced or retarded diffusivity of hydrogen atoms through metals accompanying plastic deformation has been studied for some time (11). Despite the recent debate (12-14) concerning the measurements and mechanism of this process, enhanced diffusion of hydrogen in metals undergoing plastic deformation may well be involved in the mechanisms of some localized environment-dependent failure modes, such as corrosion fatigue and hydrogen embrittlement (15-17). For the scratched electrode, enhanced rates of hydrogen evolution are possible (10), and there thus exists the likelihood of a combination of enhanced hydrogen discharge and subsequent rapid transport through the metal substrate. Such processes may be envisaged as having repercussions for environment-sensitive failure of metals. ExperimentalFull details of the potentiostatically controlled scratched electrode technique have been presented previously (1-7). The technique is designed for measurement of both the instantaneous and subsequent events that occur when a fresh metal surface is created in solutions under electrochemical control. The disk electrodes used in this work were made from Cr, Fe, and a range of iron/chromium binary alloys of compositions 5%, 20%, and 50% Cr. These are d...

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“…A recent suggestion that these effects were due to Joule heating associated with the high fugacities and current densities needed to observe measurable permeation rates (30) is not convincing (31), and it is our opinion that this direct result, as well as other indirect measurements, provide clear proof of the existence of hydrogen transport.…”

mentioning

confidence: 75%

The Use of the Electrochemical Permeation Technique to Study Hydrogen Transport and Trapping in Iron

Bernstein¹,

Thompson²

1982

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The electrochemical technique has become an important tool in studying hydrogen transport in metals. In order to maximize the information obtainable, the electrochemical conditions must be carefully controlled, particularly at the input and output surfaces. Subsequent analysis of the kinetics of consecutive transients can then be used to discriminate between strong (irreversible) and weak (reversible) traps. This approach has been illustrated for iron and a number of iron-titanium alloys, and it has been shown to be possible to model the data to calculate most of the important trapping parameters in such systems.These parameters describe trap populations that can be manipulated to control the extent of some types of hydrogen embrittlement, as illustrated by experiments on a titanium-containing HSLA steel.The permeation technique has also been shown to be useful in detecting the occurrence and extent of dislocation transport of hydrogen in iron. Some of the implications of the effect of such a process on subsequent embrittlement in ferrous and non-ferrous alloys have been assessed.

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On the electrochemical permeation measurements of hydrogen in nickel undergoing plastic deformation

Cited by 20 publications

References 5 publications

Effect of Mechanical Deformation on Permeation of Hydrogen in Iron

Effect of Mechanical Deformation on Permeation of Hydrogen in Iron

Accelerated Evolution of Hydrogen on Freshly Generated Metal Surfaces in Aqueous Solution

The Use of the Electrochemical Permeation Technique to Study Hydrogen Transport and Trapping in Iron

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