Advanced hard anodic alumina coatings via etidronic acid anodizing

Kikuchi, Tatsuya; Takenaga, Akimasa; Natsui, Shungo

doi:10.1016/j.surfcoat.2017.07.043

Cited by 41 publications

(19 citation statements)

References 42 publications

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“…Entre los electrolitos más comúnmente usados para conseguir D int entre 50 y 600 nm usando potenciales de anodizado de hasta 400 V se encuentran: el ácido fosfórico (H 3 PO 4 ) (Li et al, 2006;Masuda et al, 1998;Xu et al, 2015;Zhang et al, 2010), malónico (C 4 H 6 O 6 ) (Knörnschild et al, 2015;Santos et al, 2012;Sun et al, 2013), cítrico (C 6 H 8 O 7 ) (Chen et al, 2014;Ma et al, 2016;Wang et al, 2013), acetilendicarboxílico o butinodioico (C 4 H 2 O 4 ) (Kikuchi et al, 2014a), selénico (H 2 SeO 4 ) (Akiya et al, 2015;Kikuchi et al, 2014b;Nazarkina et al, 2015;Nazarkina et al, 2017;Nishinaga et al, 2013), etidrónico (Kikuchi et al, 2015(Kikuchi et al, y 2017, entre otros. Al aumentar el potencial de anodizado superior a los 400 V, se ha optado por utilizar electrolitos a base de mezclas de ácidos y alcoholes los cuales actúan como difusores de calor en la celda electroquímica (Chen et al, 2014;Wang et al, 2013).…”

Section: Modulación Del Tamaño Y Disposición De Poros En La Aapunclassified

Alúmina anódica porosa (AAP): arreglo de nanocrisoles de α-alúmina de tamaño modulable

González-Campuzano

Zamora

2021

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Debido al creciente interés en la síntesis de diferentes estructuras a escala nanométrica, las alúminas anódicas porosas son una alternativa emergente a los métodos más sofisticados y costosos que se utilizan actualmente. En este trabajo se presenta una breve revisión acerca de algunos resultados experimentales recientes para sintetizar alúminas anódicas porosas con diámetros de poro extra grandes (>200 nm), usando mezclas de ácidos como electrolitos y voltajes altos de anodizado. Adicionalmente, se presentan estudios relacionados con la estabilidad térmica de las alúminas anódicas porosas, formadas en condiciones estándar, usando los electrolitos más comunes (ácidos sulfúrico, oxálico y fosfórico). Dichos estudios han mostrado que la alúmina anódica, de inicio amorfa, debe transitar por un proceso de eliminación de aniones previo a la transformación de fases policristalinas hasta alcanzar la fase más estable, α-alúmina. Finalmente, se mencionan algunas de las más destacadas aplicaciones que podrían tener las nanoestructuras obtenidas a partir de alúminas anódicas porosas obtenidas por métodos no convencionales y las tratadas térmicamente.

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Section: Modulación Del Tamaño Y Disposición De Poros En La Aapunclassified

Alúmina anódica porosa (AAP): arreglo de nanocrisoles de α-alúmina de tamaño modulable

González-Campuzano

Zamora

2021

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“…Anodization of aluminum and its alloys is a relatively simple approach for formation of highly-textured surfaces [1][2][3][4][5][6][7][8][9][10]. It enables ease of control of the respective surface parameters (pore diameters, depth and distribution) [11].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Anodized Al 1050 with Electrochemically Deposited Cu, Ni and Cu/Ni and Their Behavior in a Model Corrosive Medium

Girginov

Kozhukharov

Tsanev

et al. 2021

J. Electrochem. Sci. Technol

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The specific benefits of the modified films formed on preliminary anodized aluminum, including the versatility of their potential applications impose the need for evaluation of the exploitation reliability of these films. In this aspect, the durability of Cu and Ni modified anodized aluminum oxide (AAO) films on the low-doped AA1050 alloy was assessed through extended exposure to a 3.5% NaCl model corrosive medium. The electrochemical measurements by means of electrochemical impedance spectroscopy (EIS) and potentiodynamic scanning (PDS) after 24 and 720 hours of exposure have revealed that the obtained films do not change their obvious barrier properties. In addition, supplemental analyses of the coatings were performed, in order to elucidate the impact of the AC-deposition of Cu and Ni inside the pores. The scanning electron microscopy (SEM) images have shown that the surface topology is not affected and resembles the typical surface of an etched metal. The subsequent energy dispersive X-ray spectroscopy (EDX) tests have revealed a predominance of Cu in the combined AAO-Cu/Ni layers, whereas additional X-ray photoelectron (XPS) analyses showed that both metals form oxides with different oxidation states due to alterations in the deposition conditions, promoted by the application of AC-polarization of the samples.

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“…Electrochemical anodizing is one of the most important surface finishing processes for aluminum and its alloys and is widely employed for dielectric film coating [20,21,22], coloring [23,24,25], hardening [26,27,28], corrosion resistance improvements [29,30,31], and novel nanomaterial fabrication [32,33,34,35,36,37,38,39,40,41,42,43]. So far, processes combining traditional anodizing in sulfuric, oxalic, and phosphoric acids with self-assembled monolayer (SAM) coatings have been reported by several research groups for superhydrophilic and superhydrophobic aluminum surfaces [44,45].…”

Section: Introductionmentioning

confidence: 99%

A Superhydrophilic Aluminum Surface with Fast Water Evaporation Based on Anodic Alumina Bundle Structures via Anodizing in Pyrophosphoric Acid

et al. 2019

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A superhydrophilic aluminum surface with fast water evaporation based on nanostructured aluminum oxide was fabricated via anodizing in pyrophosphoric acid. Anodizing aluminum in pyrophosphoric acid caused the successive formation of a barrier oxide film, a porous oxide film, pyramidal bundle structures with alumina nanofibers, and completely bent nanofibers. During the water contact angle measurements at 1 s after the water droplet was placed on the anodized surface, the contact angle rapidly decreased to less than 10°, and superhydrophilic behavior with the lowest contact angle measuring 2.0° was exhibited on the surface covered with the pyramidal bundle structures. As the measurement time of the contact angle decreased to 200–33 ms after the water placement, although the contact angle slightly increased in the initial stage due to the formation of porous alumina, at 33 ms after the water placement, the contact angle was 9.8°, indicating that superhydrophilicity with fast water evaporation was successfully obtained on the surface covered with the pyramidal bundle structures. We found that the shape of the pyramidal bundle structures was maintained in water without separation by in situ high-speed atomic force microscopy measurements.

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Advanced hard anodic alumina coatings via etidronic acid anodizing

Cited by 41 publications

References 42 publications

Alúmina anódica porosa (AAP): arreglo de nanocrisoles de α-alúmina de tamaño modulable

Alúmina anódica porosa (AAP): arreglo de nanocrisoles de α-alúmina de tamaño modulable

Characterization of Anodized Al 1050 with Electrochemically Deposited Cu, Ni and Cu/Ni and Their Behavior in a Model Corrosive Medium

A Superhydrophilic Aluminum Surface with Fast Water Evaporation Based on Anodic Alumina Bundle Structures via Anodizing in Pyrophosphoric Acid

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