The effects of sealing on cracking tendency of anodic films on 2024 aluminum alloy after heating up to 300 °C

Liu, Weihua; Zuo, Yu; Chen, Shengli; Zhao, Xuhui; Zhao, Jingmao

doi:10.1016/j.surfcoat.2008.10.032

Cited by 19 publications

(11 citation statements)

References 20 publications

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“…Different thermal expansions between substrate and anodic films may also lead to crack formation. The presence of cracks was detrimental to film corrosion resistance; the corrosive substance can penetrate the Al substrate through the cracks . Both samples #1 and #2 showed the same crack density.…”

Section: Resultsmentioning

confidence: 99%

Effect of AlSiFe on the anodizing process of 6063 aluminum

Chen

Shi

et al. 2016

Surface & Interface Analysis

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AlSiFe phase can form microscopic galvanic couples that decrease corrosion resistance of 6063 aluminum which may influence the anodizing process. Two samples of 6063 aluminum were prepared. One sample was cut along the extrusion direction of the billet, and the other was cut perpendicular to the extrusion direction. Both samples exhibited the same characteristics, except for the distribution of the second phase AlSiFe. Both samples were subjected to anodizing treatments. Comparison between anodic oxide films was performed. The microstructure of Al substrates and anodic oxide films were examined using a scanning electron microscope, an optical microscope, and a glow discharge optical emission spectrometer. Results indicated that the thicknesses and elemental distributions of the anodic oxide films were almost the same. Moreover, the second phase AlSiFe influenced the anodic oxidation process, resulting in cavities in the anodic oxide film that affected its brightness. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 99%

Effect of AlSiFe on the anodizing process of 6063 aluminum

Chen

Shi

et al. 2016

Surface & Interface Analysis

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“…Се лективное растворение данных частиц в процессе анодирования может оказывать существенное влияние на микроструктуру АОП. Различие хи мического состава алюминиевой матрицы и ин терметаллических частиц сплава приводит к из менению морфологии пор, появлению дефектов и трещин, вызванных избыточными остаточны ми внутренними напряжениями в сформирован ном оксидном слое [12][13][14]. Необходимо отме тить, что предварительная промывка слоя АОП дистиллированной водой приводит к тому, что на начальном этапе уплотнения температура в глу бине пор меньше, чем у поверхности, что может способствовать возникновению механических напряжений и растрескиванию АОП [14][15][16].…”

Section: Introductionunclassified

Изучение Коррозионного Поведения Модифицированных Анодно-Оксидных Покрытий На Сплаве Алюминия АД31

Осипенко¹,

Харитонов²,

Макарова³

et al. 2021

Физикохимия поверх. и защ. мат.

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Методами сканирующей электронной микроскопии, потенциодинамической поляризации, элек трохимической импедансной спектроскопии, а также испытаниями в камере соляного тумана уста новлены зависимости защитных свойств анодно-оксидных покрытий на сплавах алюминия АД31, модифицированных нитратами магния, калия и некоторых 3 <7-элементов, от составов растворов уплотнения и параметров финишной обработки. Предложен механизм формирования модифици рованных анодно-оксидных покрытий в процессе уплотнения и последующей термической обра ботки.

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“…The results showed that NaAlO 2 sealing successfully sealed the pores of anodic oxide film and had good mechanical properties regarding the highest Vickers hardness and a good anticorrosion property. Liu studied the dichromate sealed anodic oxide film, and the cracking tendency was obviously decreased, which was attributed to a lower hydration extent and the opening of the pores during sealing process. The effects of residual water in the pores of aluminum anodic oxide layers before the sealing process on corrosion resistance were studied by Lee .…”

Section: Introductionmentioning

confidence: 99%

Influence of the Self-Sealing Layer on the Corrosion of Anodic Aluminum Oxide Films

Zhao

et al. 2018

ACS Appl. Nano Mater.

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It is well-known that novel structured anodic aluminum oxide films composed of a self-sealing layer, a porous layer, and a barrier layer show much-better anticorrosion performance compared to that of porous anodic aluminum oxide film (AAO). However, the factor that critically influences the anticorrosion performance of anodic aluminum oxide film is still unknown. The relationship between the self-sealing layer structure and the anticorrosion properties of anodic aluminum oxide was explored in the present work. The surface morphology, film thickness, and surface roughness were characterized by field emission scanning electron microscopy and confocal laser scanning microscopy. Electrochemical test results revealed that the anticorrosion property of self-sealing anodic oxide film increased with the thickness of the self-sealing layer instead of the total film thickness alone. The self-sealing layer successfully decreased the diffusion of chlorine ions permeating into the porous layer. The self-sealing layer played a critical role in anticorrosion by inhibiting the ingress of corrosive medium into the porous layer.

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The effects of sealing on cracking tendency of anodic films on 2024 aluminum alloy after heating up to 300 °C

Cited by 19 publications

References 20 publications

Effect of AlSiFe on the anodizing process of 6063 aluminum

Effect of AlSiFe on the anodizing process of 6063 aluminum

Изучение Коррозионного Поведения Модифицированных Анодно-Оксидных Покрытий На Сплаве Алюминия АД31

Influence of the Self-Sealing Layer on the Corrosion of Anodic Aluminum Oxide Films

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