Interfacial Void Model for Corrosion Pit Initiation on Aluminum

Muthukrishnan, Kamal; Hebert, Kurt R.; Makino, Takeshi

doi:10.1149/1.1715091

Cited by 13 publications

(8 citation statements)

References 24 publications

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“…18,19 Understanding of these processes, as they occur in the model system of alkaline dissolution of aluminum, would help elucidate fundamental aspects of the chemical mechanism of hydrogen injection during hydrogen embrittlement. Also, since near-surface voids function as sites for corrosion pits, 20 the formation of these voids is relevant to the mechanism of pit initiation. It has been proposed that both void formation and hydrogen absorption result from injection of hydrogen-vacancy defects during dissolution, which are energetically favored at room temperature due to the large vacancy-hydrogen binding energy in Al.…”

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confidence: 99%

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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Formation of Aluminum Hydride during Alkaline Dissolution of Aluminum

Adhikari

Lee

Hebert

2008

J. Electrochem. Soc.

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“…Thus, various etching techniques for such a purpose have been developed. Some research has focused on the initial stages of aluminum etching, which was the main factor to determine the pit density on Al foil [2][3][4][5][6]. The others were related to the growth and passivation of the tunnels within the Al foil, which are the theoretical basis of controlling the tunnel length of the pits and maintaining a non-piercing layer of Al foil in order to have a better mechanical strength.…”

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confidence: 99%

Growth and passivation of aluminum etch tunnels at on-off controlling DC

Wang

2008

Front. Mater. Sci. China

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In order to control the length of tunnels within Al foil etched in HCl-H 2 SO 4 solutions, the influence of on-off control of the DC on growth and passivation of tunnels has been investigated. From SEM of oxide replicas of tunnels, it was found that, in a given etchant solution at a special temperature, the longest tunnel length depended only on the turn-on interval of DC, and the number of pits was determined by the total electricity of the DC. The corresponding mechanism is that the potential of Al foil changed rapidly at the point of the switch of DC by the result according to the anodic polarization curve and potential-time (E-t) response curves. The moment the DC was switched on, the potential increased immediately over pitting potential, leading to nucleation of pits at the surface and growth of tunnels at special lengths. When the DC was switched off, the potential rapidly decreased to a passive state, leading to the cessation of nucleation and the death of tunnels. Therefore, the longest tunnel length can be controlled and a nonpiercing layer can be obtained. Furthermore, consequent etching of Al foil by the on-off control of the DC is beneficial for maintaining a good mechanical strength.

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“…For PEO the same phases are followed by sparking and arcing steps if the process is sufficiently long. Literature devoted to PEO has been abundant in recent last years (1)(2)(3)(4)(5)(6)(7)(8)(9)(10). A very interesting literature review was published by S. Ono et al (3).…”

Section: Introductionmentioning

confidence: 99%

Modeling the Plasma Electrolytic Oxidation of Aluminium and Magnesium Alloys

Caire¹,

Dalard²,

Minko³

2007

ECS Trans.

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International audienceA numerical model was developed to simulate the plasma electrolytic oxidizing of aluminium and magnesium alloys in direct current galvanostatic mode. The model based on the analysis of acoustic emission assumes that during plasma oxidizing the dielectric breakdown is due to the increase of electric field appearing at the barrier layer situated at the bottom of pores. The model simulates the pore growth by use of an equivalent resistive network. This very simple model includes nevertheless no less than eleven ill-known physical parameters leading to a difficult calibration. Though the model was not yet calibrated, it reproduced fairly well the experimental results, particularly the beginning of anodization. The numerous assumptions made to build the model were confirmed by the preliminary results. The particularly difficult calibration of this model is in progress and will be published soo

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Interfacial Void Model for Corrosion Pit Initiation on Aluminum

Cited by 13 publications

References 24 publications

Formation of Aluminum Hydride during Alkaline Dissolution of Aluminum

Formation of Aluminum Hydride during Alkaline Dissolution of Aluminum

Growth and passivation of aluminum etch tunnels at on-off controlling DC

Modeling the Plasma Electrolytic Oxidation of Aluminium and Magnesium Alloys

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