Processes on aluminium on the negative side of the open-circuit potential

Radošević, Jagoda; Kliškić, Maja; Dabić, Pero; Stevanović, R.M.; Despić, A.R.

doi:10.1016/0022-0728(90)85094-l

Cited by 35 publications

(25 citation statements)

References 14 publications

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“…Therefore, our results suggest that aluminum dissolution occurs through a hydride surface species as an intermediate. The participation of hydride species in Al dissolution was proposed earlier by other researchers on the basis of electrochemical experiments (18)(19)(20). Our results, however, are the first surface analytical measurements supporting the presence of hydride during dissolution.…”

Section: Discussionsupporting

confidence: 79%

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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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Section: Discussionsupporting

confidence: 79%

“…This indicates that the dissolution potential is consistent with the presence of deuteride on the Al surface. Additional indications of hydride on Al electrodes after polarization at cathodic potentials were found by Despic and co-workers (19,20).…”

Section: Discussionsupporting

confidence: 54%

Surface Processes Accompanying Corrosion-Induced Hydrogen Absorption into Aluminum

2007

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“…In contrast, the Nernst potential of direct Al dissolution at pH 14, −2.56 V vs Ag/AgCl, 10 suggests a large dissolution overpotential and, hence, the presence of a resistive surface layer. Additional indications of hydride were found by Despic et al 35 and Radosevic et al, 36 who observed that polarization of Al at cathodic potentials produced an oxidizable substance, which they identified as aluminum hydride, on the basis of its observed oxidation potential.…”

Section: ͓1͔mentioning

confidence: 73%

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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“…In support of the possible role of hydride, Despić and co-workers observed that polarization at cathodic potentials generates a product with an oxidation potential close to that of aluminum hydride. 10,11 In a recent secondary ion mass spectrometry investigation, we showed that submicrometer AlH 3 particles are formed as a product of open-circuit Al dissolution in 1 M NaOH solution at room temperature. 12 Potential measurements indicated that the dissolution potential was close to the Nernst potential for oxidation of the hydride.…”

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confidence: 99%

Participation of Aluminum Hydride in the Anodic Dissolution of Aluminum in Alkaline Solutions

Adhikari

Hebert

2008

J. Electrochem. Soc.

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The mechanism of anodic alkaline dissolution of aluminum was investigated through the analysis of cyclic voltammetry (CV) and potential step experiments. Attention was focused on the role of aluminum hydride (AlH3) as a reaction intermediate, as suggested by the recent detection of AlH3 formation during open-circuit dissolution. Potential step experiments at pH 11.75 revealed that the potential at the metal–surface film interface was close to the Nernst potential of AlH3 oxidation. This finding suggested a reaction mechanism in which an interfacial AlH3 layer is formed continuously by reaction of cathodically formed H with Al, and is then oxidized to the dissolution product, aluminate [Al(OH)4−] ions. However, potential step experiments at pH 11 did not indicate the presence of interfacial AlH3 ; instead, the metal–film interface was close to the equilibrium potential of Al oxidation. Analysis of the CV indicated an abrupt transition in dissolution behavior between the two pH values, from a relatively rapid dissolution controlled by diffusion and film conduction in highly alkaline solutions, to a slow dissolution at a lower pH controlled by a highly resistive surface film. The formation of interfacial AlH3 occurs readily at the higher pH, but is suppressed as the pH approaches neutrality.

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Processes on aluminium on the negative side of the open-circuit potential

Cited by 35 publications

References 14 publications

Surface Processes Accompanying Corrosion-Induced Hydrogen Absorption into Aluminum

Surface Processes Accompanying Corrosion-Induced Hydrogen Absorption into Aluminum

Formation of Aluminum Hydride during Alkaline Dissolution of Aluminum

Participation of Aluminum Hydride in the Anodic Dissolution of Aluminum in Alkaline Solutions

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