Interplay between parameter variation and oxide structure of a modified PAA process

Schneider, Michael; Kremmer, K.; Weidmann, Stefan; Fürbeth, W.

doi:10.1002/sia.5248

Cited by 13 publications

(29 citation statements)

References 20 publications

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“…2. Under the concentration and potential conditions, as in SAA20 and SAA50, the oxide thickness increases with an increasing anodizing temperature, in accordance with Schneider et al 11 The thickness of the barrier layer generally corresponds to the applied voltage following the 1.2 nm/V relation. 4 The relation accurately predicts the barrierlayer thickness of both SAA oxides, while the measured values for PSA oxides are slightly larger than expected.…”

Section: Resultssupporting

confidence: 79%

Interface strength and degradation of adhesively bonded porous aluminum oxides

Abrahami

Kok²,

Gudla

et al. 2017

npj Mater Degrad

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For more than six decades, chromic acid anodizing has been the main step in the surface treatment of aluminum for adhesively bonded aircraft structures. Soon this process, known for producing a readily adherent oxide with an excellent corrosion resistance, will be banned by strict international environmental and health regulations. Replacing this traditional process in a high-demanding and high-risk industry such as aircraft construction requires an in-depth understanding of the underlying adhesion and degradation mechanisms at the oxide/resin interface resulting from alternative processes. The relationship between the anodizing conditions in sulfuric and mixtures of sulfuric and phosphoric acid electrolytes and the formation and durability of bonding under various environmental conditions was investigated. Scanning electron microscopy was used to characterize the oxide features. Selected specimens were studied with transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy to measure resin concentration within structurally different porous anodic oxide layers as a function of depth. Results show that there are two critical morphological aspects for strong and durable bonding. First, a minimum pore size is pivotal for the formation of a stable interface, as reflected by the initial peel strengths. Second, the increased surface roughness of the oxide/resin interface caused by extended chemical dissolution at higher temperature and higher phosphoric acid concentration is crucial to assure bond durability under water ingress. There is, however, an upper limit to the beneficial amount of anodic dissolution above which bonds are prone for corrosive degradation. Morphology is, however, not the only prerequisite for good bonding and bond performance also depends on the oxides' chemical composition.

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Section: Resultssupporting

confidence: 79%

Interface strength and degradation of adhesively bonded porous aluminum oxides

Abrahami

Kok²,

Gudla

et al. 2017

npj Mater Degrad

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“…Anodizing methods for creating nanofeatured films in aluminum and titanium have been extensively studied under a variety of different conditions [59], [60], [61].…”

Section: B Background On Techniquementioning

confidence: 99%

“…From these studies, the observed results from differing voltage and dwell times have established that there is a direct correlation between voltage and barrier layer thicknesses [59]. These anodizing methods used a variety of different acidic electrolytes at varying concentrations to include sulfuric acid, oxalic acid and phosphoric acid [60].…”

Section: B Background On Techniquementioning

confidence: 99%

“…These anodizing methods used a variety of different acidic electrolytes at varying concentrations to include sulfuric acid, oxalic acid and phosphoric acid [60]. In the case of anodized aluminum, much of the research was driven from a need to create strong, lightweight, corrosion resistant aircraft components [59].…”

Section: B Background On Techniquementioning

confidence: 99%

“…The current desire to create improved semiconductors is now generating a demand for this current research much in the same way that the aviation needs drove the Aluminum research. Studies thus far regarding the creation of tungsten trioxide nanofeatured films involve the use of acidic electrolytes in their nanofeature film production methods [59], [60], [62]. Previous studies varied concentrations of fluoride oxides in order to produce nanofeatured films.…”

Section: B Background On Techniquementioning

confidence: 99%

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Characterization of Micron-Scale Nanotublar Super Dielectric Materials

Gandy¹

2015

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instruction, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to ABSTRACT (maximum 200 words)This research is part of an ongoing program of study focused on dielectric materials based on a novel hypothesis: that porous electrically insulating solids in which the pores are filled with liquids containing an ionic species (such as water with dissolved salt) will have very high dielectric values by virtue of the separation of ions in the liquid phase and concurrent formation of large dipoles. Earlier work focused on the creation of super dielectric materials by saturating porous electrically insulating powders, such as alumina, with salt solutions.The focus of the present work is the characterization and evaluation of capacitors based on a novel dielectric: titanium dioxide nanotube arrays created by anodization and filled with a concentrated aqueous salt solution. Capacitors made up of this so-called nanotubular super dielectric material were found to have extreme dielectric constants, greater than one billion. The same capacitors also registered unprecedented energy densities, consistently greater than 400 joules per cubic centimeter, which is more than ten times the best commercial supercapacitors. Sufficient data was collected to propose a correlation relating dielectric thickness, salt concentration, and electrode surface area to overall energy density. Submitted in partial fulfillment of the requirements for the degree of SUBJECT TERMS MECHANICAL ENGINEER AND MASTER OF SCIENCE IN MECHANICAL ENGINEERING

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Particle reinforced open porous anodizing layers on AA5005

Schneider

Kremmer

Weidmann

et al. 2017

Materials & Corrosion

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The present work deals with the target aimed design of anodic oxide films on AA5005 by modified phosphoric acid anodizing and reinforcement by subsequent impregnation with nanosized silicon dioxide by chemical nanotechnology. The authors show the influence of the anodizing time on the oxide layer thickness, the pore diameter and the morphology. It is revealed that silicon dioxide nanoparticles are successful when incorporated into the open structure pores of the layer. The anodizing and the incorporation process were carried out wet on wet. Complementary electrochemical measurements show the potential of the modified oxide layer in view of corrosion protection despite their deliberated open porosity

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Interplay between parameter variation and oxide structure of a modified PAA process

Cited by 13 publications

References 20 publications

Interface strength and degradation of adhesively bonded porous aluminum oxides

Interface strength and degradation of adhesively bonded porous aluminum oxides

Characterization of Micron-Scale Nanotublar Super Dielectric Materials

Particle reinforced open porous anodizing layers on AA5005

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