Characterization of hydrogen defects forming during chemical charging in the aluminum

Rozenak, P.; Sirois, E.; Ladna, B.; Birnbaum, H.K.; Spooner, S.

doi:10.1016/j.jallcom.2004.06.041

Cited by 31 publications

(52 citation statements)

References 34 publications

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“…Because the treatment time was much smaller than the transfer time, any near-surface D absorbed during dissolution would have dispersed from the near-surface region, by diffusion toward the bulk metal. In the experiments of Rozenak et al, 22 it is likely that the treatment time far exceeded the transfer time, and therefore diffusion during transfer would not have eliminated the D − profiles. That is, measurement of profiles due to mobile D would require small transfer times relative to the treatment time, a condition which was not met in the present experiments.…”

Section: ͓1͔mentioning

confidence: 98%

“…21,22 For example, Rozenak et al exposed Al to NaOD ͑D 2 O͒ solution for 2 h, and found D − profiles to depths of ϳ1 m. 22 If it is assumed that D − represents a mobile form of deuterium in Al, this apparent discrepancy may be explained by considering diffusion in the metal after the alkaline treatment. The penetration distance of diffusing D into the metal increases with time according to ␦ D ϳ ͑D D t͒ 1/2 , where D D is the interstitial deuterium diffusivity.…”

Section: ͓1͔mentioning

confidence: 99%

“…21,22 The present work is a SIMS study of hydrogen absorption into Al during the early stages of alkaline dissolution. We focus on treatment times of a few minutes, which result in activation of the metal surface, and the formation of large quantities of subsurface voids.…”

mentioning

confidence: 99%

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Formation of Aluminum Hydride during Alkaline Dissolution of Aluminum

Adhikari

Lee

Hebert

2008

J. Electrochem. Soc.

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The role of hydrogen-containing surface species in the alkaline dissolution of aluminum was studied by secondary ion mass spectrometry ͑SIMS͒ and atomic force microscopy ͑AFM͒. The measurements revealed quasi-periodic nucleation and dissolution of large number densities of 10-100 nm size particles, during open-circuit dissolution in 1 M NaOH͑D͒ at room temperature. SIMS results using deuterated solutions, and prior Auger microprobe measurements, indicated that the particles were composed of aluminum hydride ͑deuteride͒, with an aluminum hydroxide ͑deuteroxide͒ surface layer. The measured open-circuit potential during dissolution was close to the Nernst potential of hydride oxidation. It was concluded that AlH 3 forms continuously during dissolution by reaction of cathodically generated hydrogen with the Al metal and is oxidized to aluminate ions ͓Al͑OH͒ 4 − ͔ in the accompanying anodic process. The present results are a direct confirmation of hydride formation on Al accompanying corrosion.

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Section: ͓1͔mentioning

confidence: 98%

Section: ͓1͔mentioning

confidence: 99%

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Formation of Aluminum Hydride during Alkaline Dissolution of Aluminum

Adhikari

Lee

Hebert

2008

J. Electrochem. Soc.

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“…4(b), which was charged in the passive region, showed a ductile fracture surface. Research on the electrochemical charging of highpurity aluminum or aluminum alloys has shown that vacancies are formed in conjunction with hydrogenation, then diffuse into the bulk of the material as hydrogenvacancy pairs, 11,16,17) forming voids as a result of their concentration along the {111} plane. 18) Hydrogen exists within voids in the molecular state.…”

Section: Existing State Of Hydrogen Corresponding To Thementioning

confidence: 99%

Existing State of Hydrogen in Electrochemically Charged Commercial-Purity Aluminum and Its Effects on Tensile Properties

et al. 2011

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Hydrogen was introduced in commercial-purity (99%) aluminum by electrochemical charging to study the existing state of hydrogen and its effects on the mechanical properties of aluminum. Electrochemical charging was conducted in an aqueous H 2 SO 4 solution with 0.1% NH 4 SCN as a hydrogen recombination poison. The potential and pH during the charging were determined from the immune, passive, and corrosive regions in the Pourbaix diagram to determine the optimum conditions for the charging. The maximum amount of hydrogen absorbed was obtained in the immune region. The amount of hydrogen and its existing state were examined using hydrogen desorption curves, which were obtained by thermal desorption spectroscopy. The curves showed distinctive peaks corresponding to trapping sites of hydrogen in the material. One of the peaks was observed at approximately 100 C, and it corresponds to vacancies and dislocations in the material; another peak was observed at approximately 400 C and it corresponds to molecular hydrogen in blisters. It was presumed that charged hydrogen diffuses into the bulk of the material to form hydrogen-vacancy pairs, and then these pairs cluster to form blisters. The fracture strain of charged aluminum in the immune region decreased with decreasing strain rate, showing an inverse dependence on the fracture strain of the uncharged material. This phenomenon was considered to be caused by hydrogen transport by dislocations through the interaction between hydrogen and dislocations. The phenomenon was further confirmed by the observation of hydrogen release during tensile deformation, where the amount of hydrogen was high in the strain rate range where the interaction between dislocations and hydrogen was prominent.

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“…Secondary ion mass spectrometry (SIMS) has been used extensively for characterization of surface and absorbed hydrogen in aluminum (7)(8)(9)(10). This paper reports SIMS measurements of hydrogen-containing species on Al after dissolution.…”

Section: Introductionmentioning

confidence: 99%

Surface Processes Accompanying Corrosion-Induced Hydrogen Absorption into Aluminum

2007

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The role of hydrogen-containing species in the alkaline dissolution of aluminum was studied by secondary ion mass spectrometry (SLMS). Large number densities of submicron particles nucleated and then disappeared during dissolution, at intervals of approximately 3 min. The particles were composed of aluminum hydride, with an aluminum hydroxide surface layer. When particles first appeared, the aluminate ion concentration near the surface was at the solubility of Al(OH)3, and the potential was close to the Nernst potential for oxidation of AlH3 to Al(OH)3. The observed formation of AlH3 indicates that the dissolving Al surface was poised near this equilibrium potential, i. e. that a hydride species serves as an intermediate in the dissolution process.Keywords alkaline dissolution, aluminum hydrides, hydrogen absorption, ion concentrations, surface processing, corrosion, high performance liquid chromatography, aluminum Disciplines Biochemical and Biomolecular Engineering | Biology and Biomimetic Materials CommentsThe archival version of this work was published in S. Adhikari, J. Lee and K. R. Hebert, "Surface Processes Accompanying Corrosion-Induced Hydrogen Absorption into Aluminum," ECS Trans., 3, (31) 173-184 (2007 The role of hydrogen-containing species in the alkaline dissolution of aluminum was studied by secondary ion mass spectrometry (SIMS). Large number densities of submicron particles nucleated and then disappeared during dissolution, at intervals of approximately 3 min. The particles were composed of aluminum hydride, with an aluminum hydroxide surface layer. When particles first appeared, the aluminate ion concentration near the surface was at the solubility of Al(OH) 3 , and the potential was close to the Nernst potential for oxidation of AlH 3 to Al(OH) 3 . The observed formation of AlH 3 indicates that the dissolving Al surface was poised near this equilibrium potential, i. e. that a hydride species serves as an intermediate in the dissolution process.

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Characterization of hydrogen defects forming during chemical charging in the aluminum

Cited by 31 publications

References 34 publications

Formation of Aluminum Hydride during Alkaline Dissolution of Aluminum

Formation of Aluminum Hydride during Alkaline Dissolution of Aluminum

Existing State of Hydrogen in Electrochemically Charged Commercial-Purity Aluminum and Its Effects on Tensile Properties

Surface Processes Accompanying Corrosion-Induced Hydrogen Absorption into Aluminum

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