In situ study of gas transport through Al(OH)3 gels during AC processing

Hammons, Joshua A.; Rayment, Trevor; Tzedaki, M.; Ingelgem, Yves Van; Ustarroz, Jon; Vandendael, Isabelle; Hubin, Annick; Terryn, Herman

doi:10.1016/j.electacta.2012.02.083

Cited by 4 publications

(6 citation statements)

References 31 publications

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“…This smut layer is reported to obtain up to 90% water by mass [8]. In situ SAXS studies confirmed the presence of retained gas in the gel-like smut layer [10,11], and the formation of temporary and permanent water passageways [2]. As the process is halted, besides the dissolution of the smut layer, the temporary water passageways close [2] and the retained gas is released from the system [10,11].…”

Section: Introductionmentioning

confidence: 83%

“…It then decreases to a value of 133 Ω cm 2 at 10 s. As the smut layer is dissolving in the acidic electrolyte, the decrease in R smut is a logical result. The initial increase may be due to the closing of the temporary water passageways observed in [2], which provide easier access to the surface for charge transfer.…”

Section: Instantaneous Impedance Fittingmentioning

confidence: 99%

“…For many electrochemical treatments, such as the charging of batteries, electrolysis, and continuous processing, many processes occur during the relatively short post-treatment time [1,2]. These processes usually involve changes in the surface properties of the substrate.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the use of instantaneous impedance for post-electrochemical treatment analysis

Wouters

Claessens

Hubin

et al. 2018

Electrochemistry Communications

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Section: Introductionmentioning

confidence: 83%

Section: Instantaneous Impedance Fittingmentioning

confidence: 99%

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On the use of instantaneous impedance for post-electrochemical treatment analysis

Wouters

Claessens

Hubin

et al. 2018

Electrochemistry Communications

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“…However, it was found that the cathodic half-cycle was not a crucial factor in the development of an etched layer. Hammons et al investigated the transport of formed H 2 gas [99] through Al(OH) 3 gels formed on an Al surface [100]. It was found that gas permeation occurred through collapsible pores, and affected the pit morphology.…”

Section: Ac Anodizationmentioning

confidence: 99%

Fabrication of alumina films with laminated structures by ac anodization

Segawa

Okano

Wada

et al. 2014

Science and Technology of Advanced Materials

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Anodization techniques by alternating current (ac) are introduced in this review. By using ac anodization, laminated alumina films are fabricated. Different types of alumina films consisting of 50–200 nm layers were obtained by varying both the ac power supply and the electrolyte. The total film thickness increased with an increase in the total charge transferred. The thickness of the individual layers increased with the ac voltage; however, the anodization time had little effect on the film thickness. The laminated alumina films resembled the nacre structure of shells, and the different morphologies exhibited by bivalves and spiral shells could be replicated by controlling the rate of increase of the applied potentials.

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“…Until recently, research studies on AC electrograining have been focused on how several parameters such as frequency, electrolyte, and AC signal can influence the pitting morphology. All those studies have been focusing on ex situ observations of the final surface . However, it has also been shown that the gel‐like smut layer, which forms early in the AC electrograining process, can influence the surface kinetics of the aluminum by either restricting or allowing gas transport away from the active surface .…”

Section: Introductionmentioning

confidence: 99%

An ORP‐EIS approach to study the gas incorporation into aluminum etch films

Tzedaki

Verguts

Ingelgem

et al. 2016

Surface & Interface Analysis

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Electrochemical impedance spectroscopy was used as a novel technique to study gas diffusion through a surface gel. The system under study underwent an alternating current electrograining process that is used in lithography and in capacitor foils. During this process H 2 bubbles are trapped inside a gel like structure consisting of 90% water. It is presented that through in situ impedance, the gas diffusion mechanism through the gel can be explained and correlated to the pitting morphology. It is demonstrated that fast gas diffusion leads to a desired uniform aluminum pitting after alternating current processing and that the structure of the gel plays an important role in this process.

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In situ study of gas transport through Al(OH)3 gels during AC processing

Cited by 4 publications

References 31 publications

On the use of instantaneous impedance for post-electrochemical treatment analysis

On the use of instantaneous impedance for post-electrochemical treatment analysis

Fabrication of alumina films with laminated structures by ac anodization

An ORP‐EIS approach to study the gas incorporation into aluminum etch films

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