Simulating corrosion conditions in the microvolumes of cracklike defects

Kurov, O. V.; Krutsan, A. M.; Melekhov, R. K.

doi:10.1007/bf00716629

Cited by 13 publications

(2 citation statements)

References 3 publications

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“…Rupture of blisters near the edges was the result of secondary cracks propagating from some other imperfection or from a second primary crack. (24)(25)(26), pitting (27), stress corrosion cracking (26,(28)(29)(30)(31), filiform corrosion under organic coatings (32,33), and in model sealed-up occluded cells (34,35), with measured pH values generally lying in the range from 1 to 4. A number of investigators have observed the evolution of gas from such occluded corrosion cells on aluminum, with Hubner and Wranglen (36) and Bargeron and Benson (37) having actually shown that hydrogen is the gas which is evolved.…”

Section: Resultsmentioning

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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Section: Resultsmentioning

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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“…The local pH within occluded corrosion cells on aluminum and the internal potential has been measured for crevice corrosion (34,35), stress corrosion cracking (36,37), and for scaled-up models of localized corrosion cells (38). The experimental pH values range for various forms of occluded corrosion cells on aluminum range from 1 to 4.…”

Section: Rupture Stress and Pressurementioning

confidence: 99%

(Invited) Localized Breakdown of the Natural Oxide Film on Aluminum by Chloride Ions and the Formation of Oxide Blisters

McCafferty¹,

Natishan²

2011

ECS Trans.

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A sequence of events is discussed for the initiation and propagation of corrosion pits on aluminum in chloride solutions. Corrosion pit initiation takes into account adsorption of chloride ions on the oxide surface, penetration of chloride ions through the oxide film, and localized dissolution of aluminum at the metal/oxide interface. Corrosion pit propagation involves formation of blisters beneath the oxide film due to localized reactions which produce an acidic localized environment. The blisters subsequently rupture due to the formation of hydrogen gas in the occluded corrosion cell. Calculation of the local pH within a blister from the computed hydrogen pressure within the blister gives pH values in the range 0.85 to 2.3.

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