Analytical 3d Migration Model of Steady-State Metal Anodizing: The Velocity Fields and Trajectories of Migrating Tracers

Mirzoev, R. A.; Давыдов, А. Д.; Vystupov, S.I.; Zarubenko, E.S.; Кабанова, Т.Б.; Popkovich, A.V.

doi:10.1016/j.electacta.2017.05.025

Cited by 10 publications

(3 citation statements)

References 29 publications

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“…Then, their concentration decreases and becomes almost zero at the aluminum oxide/metal interface as well as at cell-wall boundaries. The distribution of incorporated anions in pore walls and the barrier layer is in agreement with theoretical models calculated by Mirzoev et al [86,87]. A special case of anodizing in chromic acid is characterized by the absence of incorporated anions (Figure 5d).…”

Section: Mechanism Of Anions Incorporation: Duplex and Triplex Structuresupporting

confidence: 89%

Incorporation of Ions into Nanostructured Anodic Oxides—Mechanism and Functionalities

2021

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Anodic oxidation of metals leads to the formation of ordered nanoporous or nanotubular oxide layers that contribute to numerous existing and emerging applications. However, there are still numerous fundamental aspects of anodizing that have to be well understood and require deeper understanding. Anodization of metals is accompanied by the inevitable phenomenon of anion incorporation, which is discussed in detail in this review. Additionally, the influence of anion incorporation into anodic alumina and its impact on various properties is elaborated. The literature reports on the impact of the incorporated electrolyte anions on photoluminescence, galvanoluminescence and refractive index of anodic alumina are analyzed. Additionally, the influence of the type and amount of the incorporated anions on the chemical properties of anodic alumina, based on the literature data, was also shown to be important. The role of fluoride anions in d-electronic metal anodizing is shown to be important in the formation of nanostructured morphology. Additionally, the impact of incorporated anionic species, such as ruthenites, and their influence on anodic oxides formation, such as titania, reveals how the phenomenon of anion incorporation can be beneficial.

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Section: Mechanism Of Anions Incorporation: Duplex and Triplex Structuresupporting

confidence: 89%

Incorporation of Ions into Nanostructured Anodic Oxides—Mechanism and Functionalities

2021

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“…The result of the discharges is the formation of a coating, which is a ceramic, which is formed due to the oxidation of the metal surface. The MAO process was carried out using the IPT-1000 current source, according to the previously developed technology in the borate electrolyte at a current density of 5 A / dm2 and thickness up to 30 μm [9,[13][14][15][16][17].…”

Section: Figure 1 -Sample For Corrosion Tests In a Liquid Metal Envir...mentioning

confidence: 99%

Corrosion-Resistant Ceramic Coatings that are Promising for Use in Liquid Metal Environments

Kashtanov

Красиков

Bykova

et al. 2019

KEM

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This Article Presents the Results of the Development of Multilayer Ceramic Coatings to Protect Metal Products from Corrosion in Aggressive Liquid Metal Environments. the Development is Based on the Integrated Use of Low-Temperature Heterophase Transfer and Microarc Oxidation Methods. the Results of Corrosion Tests of Coatings in the Interaction with Molten Lead in the Temperature Range of 400-600°C are Presented. the Structural Characteristics of the Coatings are Considered.

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“…14 Using these considerations, the authors have explained the experimentally observed pathways of W atoms embedded as tracers into the metal layer being anodized. 14,15 Recently, the analytical model has been suggested 10,16 allowing to calculate the pathways of neutral and charged tracers by means of equations describing the ions migration inside the barrier layer of AAO films. Without recourse to the viscous flow model, the authors of the research succeeded to explain a number of experimental observations, including the distribution of W tracers 14,15 and the presence of pure and electrolyte-contaminated layers in the structure of AAO cell walls.…”

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confidence: 99%

Probing Barrier Oxide Layer of Porous Anodic Alumina by In Situ Electrochemical Impedance Spectroscopy

Leontiev

Napolskii

2021

J. Electrochem. Soc.

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Electrochemical impedance spectroscopy (EIS) is a unique tool for both ex situ and in situ studies of the barrier layer thickness of anodic aluminium oxide (AAO). Here EIS is applied to study porous AAO formed by anodizing of high-purity Al foils in 0.3 M sulphuric acid and 0.3 M oxalic acid electrolytes. It is shown that in the high-frequency range, in situ EIS spectra coincide with the ex situ ones. Thus, the thickness of the barrier layer at the pore bases does not change after the end of the anodic polarization. The barrier layer thickness (h) is governed by the anodizing potential (U) according to the equation h = 1.03(2) nm·V−1·U + 2.2(3) nm. Features of the current transients observed during potentiostatic anodizing are discussed. It has been proved that a local maximum of current at the initial stage of anodizing corresponds to the maximum of the aluminium electroactive surface area arising due to the rearrangement of pores.

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Analytical 3d Migration Model of Steady-State Metal Anodizing: The Velocity Fields and Trajectories of Migrating Tracers

Cited by 10 publications

References 29 publications

Incorporation of Ions into Nanostructured Anodic Oxides—Mechanism and Functionalities

Incorporation of Ions into Nanostructured Anodic Oxides—Mechanism and Functionalities

Corrosion-Resistant Ceramic Coatings that are Promising for Use in Liquid Metal Environments

Probing Barrier Oxide Layer of Porous Anodic Alumina by In Situ Electrochemical Impedance Spectroscopy

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