ChemInform Abstract: THE EFFECT OF ENVIRONMENTAL PH ON THE FAILURE STRAIN OF ANODIC FILMS FORMED ON THE ALUMINIUM ALLOY 2024

Devereux, O. F.; Libsch, T. A.; Choo, Yoon H.; Bambri, Ashok K.

doi:10.1002/chin.197546027

Cited by 1 publication

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“…The presence of the blisters and the fact that the implanted species was contained in the oxide film as confirmed by XPS analysis (10), indicates that the implanted species increases the ductility and/or tensile strength of the oxide film. Although the exact nature of this effect is presently unknown, previous work indicates that the implanted ions can act physically by becoming part of the structure of the oxide (44)(45)(46), chemically by changing the surface charge which determines the interactions with the environment (20,47,48), and/or electrochemically by changing the transport properties of the oxide film (20,49).…”

Section: Olmentioning

confidence: 99%

The Mechanism of Blister Formation and Rupture in the Pitting of Ion‐Implanted Aluminum

Natishan

McCafferty

1989

J. Electrochem. Soc.

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Optical and scanning electron microscopy of ion-implanted aluminum after polarization above the pitting potential in 0.1M NaC1 have shown that corrosion pits are associated with the formation and rupture of blisters caused by gas evolution. The sequence of events involves: (i) the formation or existence of a primary crack or pore in the oxide film that allows solution contact with the metal, (ii) metal dissolution and hydrogen production at the oxide/metal interface, (iii) formation of a hydrogen pocket (bubble) that stresses the oxide film and causes the nucleation and growth of secondary cracks at the primary crack/pore, (iv) and the eventual rupture of the blister caused by the increasing hydrogen pressure. Griffith-type calculations show that the internal hydrogen pressure required to rupture a typical blister is of the order of 103 atm, whereas thermodynamic data indicate that the internal hydrogen pressure generated within localized corrosion cells on aluminum is about 104 arm.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 147.188.128.74 Downloaded on 2015-06-02 to IP

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