Two-dimensional pitting corrosion of aluminium thin layers

Balázs, Läszlö; Gouyet, J. F.

doi:10.1016/0378-4371(95)00048-c

Cited by 38 publications

(18 citation statements)

References 22 publications

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“…Since these earlier experiments, we have switched to de-ionized water of higher purity. Nonetheless, the observed fractal patterns are consistent with light microscope images of Al thin film corroded in electrolytes with low Cl -and Fe 3+ ion concentrations by Balazs and Gouyet [11]. The selective corrosion of certain grains also agrees with the secondary electron microscope images of corroded 800 nm thick Al films reported by Proost et al [12].…”

Section: As-deposited Filmssupporting

confidence: 88%

“…Post-mortem analysis of our films using a light microscope also indicates that the fractal patterns originated from an area of the sample away from the membrane window and had propagated into the observed area. The simulations of Balazs and Gouyet [11] showed that the morphology similar to that observed can be reproduced using a spreading percolation model starting from an isolated pit or seed. In the model, the candidates for corrosion are selected only from the nearest neighbors of active, i.e.…”

Section: As-deposited Filmsmentioning

confidence: 65%

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Studies of Corrosion of Al Thin Films using Liquid Cell Transmission Electron Microscopy

et al. 2013

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A fundamental understanding of the processes that occur during early stages of corrosion is traditionally limited by the dearth of techniques that probe the liquid-solid interface with both high spatial resolution and microstructural detail such as grain size and orientation. Here, we demonstrate that with a microfluidic liquid flow cell holder, we can track the progress of corrosion in situ in Al thin films with transmission electron microscopy (TEM). To mitigate the loss of resolution caused by imaging through liquid, we developed a method in which the liquid is temporarily de-wetted from the entire windowed area by switching the liquid stream from pure water to a mixture of ethanol and water. In the de-wetted region, we then collected images of the film microstructure with high spatial resolution over regular intervals while maintaining a low electron flux over the imaged area to minimize beam-induced effects. For as-deposited films, we find that the corrosion progresses in a fractal manner, consistent with reported behavior for films studied in water with low iron and chloride concentrations. For films that were subjected to rapid thermal annealing, we observe a higher density of pitting events, which we attribute to defects created by thermal stress in the oxide film. Furthermore, we observe that the pits can form at multiple locations in a single grain and are not confined to grain boundaries.

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Section: As-deposited Filmssupporting

confidence: 88%

Section: As-deposited Filmsmentioning

confidence: 65%

Studies of Corrosion of Al Thin Films using Liquid Cell Transmission Electron Microscopy

et al. 2013

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“…It is also interesting from the point of view of theoretical physics of random systems [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Surface hardening and self-organized fractality through etching of random solids

2000

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When a finite volume of etching solution is in contact with a disordered solid, complex dynamics of the solid-solution interface develop. If the etchant is consumed in the chemical reaction, the dynamics stop spontaneously on a self-similar fractal surface. As only the weakest sites are corroded, the solid surface gets progressively harder and harder. At the same time it becomes rougher and rougher uncovering the critical spatial correlations typical of percolation. From this, the chemical process reveals the latent percolation criticality hidden in any random system. Recently, a simple minimal model has been introduced by Sapoval et al. to describe this phenomenon. Through analytic and numerical study, we obtain a detailed description of the process. The time evolution of the solution corroding power and of the distribution of resistance of surface sites is studied in detail. This study explains the progressive hardening of the solid surface. Finally, this dynamical model appears to belong to the universality class of Gradient Percolation.

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“…In contrast, anodic dissolution smooths out the pores dissolving material around them. This peculiar behavior of symmetry breaking and formation of rough cathodic and smooth anodic regions is experimentally found in experiments on corrosion of aluminum foil in quasi 2D experiments [24,25].…”

Section: Resultsmentioning

confidence: 84%

Corrosion-passivation processes in a cellular automata based simulation study

2013

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A short survey of cellular automata based models for corrosion and passivation phenomena is given. Results of simulations based on the model of spatially separated anodic and cathodic reactions are presented for a cavity development from a point-like damage of a protective layer and from an initially flat unprotected surface. We show some new peculiar examples of the symmetry breaking in the cavity development. The results for the initially flat surface show roughening of the surface at the beginning of the corrosion process. After that, pit merging causes a resmoothing of the surface. An oscillatory behavior of the surface roughness is observed caused by a peninsula formation with subsequent island detachment. These results are obtained in 2D because of computational limitations. We plan simulations in 3D and point out the problems we encounter in their realization.

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Two-dimensional pitting corrosion of aluminium thin layers

Cited by 38 publications

References 22 publications

Studies of Corrosion of Al Thin Films using Liquid Cell Transmission Electron Microscopy

Studies of Corrosion of Al Thin Films using Liquid Cell Transmission Electron Microscopy

Surface hardening and self-organized fractality through etching of random solids

Corrosion-passivation processes in a cellular automata based simulation study

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