The influence of cast method and anodizing parameters on structure and layer thickness of aluminium alloys

Konieczny, J.; Dobrzański, L. A.; Labisz, K.; Duszczyk, J.

doi:10.1016/j.jmatprotec.2004.07.130

Cited by 45 publications

(32 citation statements)

References 4 publications

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“…The growth of the porous anodic film is usually considered to be a complex process resulting from antagonistic reactions: the electrochemical oxidation of the metal substrate to the Al 2 O 3 film, and the chemical dissolution of the anodic layer in highly acidic conditions. The characteristics of the resulting porosity depend on various operational parameters, such as the aluminium alloy used (Konieczny et al, 2004), the experimental anodizing conditions (content, stirring and the bath temperature (Aerts et al, 2007)) and the electrical conditions (Regone et al, 2006). Our results show that the anodic film on AA 7175T7351, includes an erratic spongy structure, clearly different from Keller's long-established model (Keller et al, 1953) made up of regular hexagonal cells, each including a straight central pore perpendicular to the initial substrate surface.…”

Section: Resultsmentioning

confidence: 75%

Black anodic coatings for space applications: Study of the process parameters, characteristics and mechanical properties

Goueffon

Arurault

Mabru

et al. 2009

Journal of Materials Processing Technology

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID: 2628 AbstractBlack inorganic anodized aluminium alloys are used for managing passive thermal control on spacecraft and for avoiding stray light in optical equipment. Spalling of these coatings has sometimes been observed after thermal cycling on 2XXX and 7XXX aluminium alloys. This phenomenon could generate particulate contamination in satellites and may affect mission lifetime. In this work, the influences of the four main steps of the process (pretreatments, sulphuric anodizing, colouring and sealing) on the coating characteristics have been studied for a 7175 T7351 aluminium alloy. The chemical heterogeneity of the coating has been underlined, 2 and its mechanical behaviour observed through crazing. Scratch-testing, used to evaluate coating adhesion to its substrate, revealed the negative impact of thermal cycling.

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Section: Resultsmentioning

confidence: 75%

Black anodic coatings for space applications: Study of the process parameters, characteristics and mechanical properties

Goueffon

Arurault

Mabru

et al. 2009

Journal of Materials Processing Technology

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“…Bu tip filmler oluşturmak için oksit filmini kısmen çözebilen herhangi bir çözelti kullanılabilir. Fakat ticari olarak tercih edilen çözeltiler sülfürik, okzalik, fosforik ve kromik asit çözeltileridir [7]. -(4.6) Bu davranış Şekil 2"de görülmektedir.…”

Section: çAlişmanin öNemi̇ (Research Significance)unclassified

Eti̇len Gli̇kol+sülfüri̇k Asi̇t İçeri̇si̇nde 7075 Alumi̇nyum Alaşimi Üzeri̇nde Alumi̇nyum Oksi̇t Tabakasinin Geli̇şti̇ri̇lmesi̇

Ateş¹,

Mutlu²,

Mert³

et al. 2017

NWSA

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ETİLEN GLİKOL+SÜLFÜRİK ASİT İÇERİSİNDE 7075 ALUMİNYUM ALAŞIMI ÜZERİNDEALUMİNYUM OKSİT TABAKASININ GELİŞTİRİLMESİ ÖZ Bu çalışmada, 7075 aluminyum (Al) alaşımının korozyon dayanımının arttırılması amacıyla, Al yüzeyindeki oksit tabakasının geliştirilmesi hedeflenmiştir. 7075Al"un anot, Pt katot ve Ag/AgCl"nin referans elektrot olarak kullanıldığı üç elektrot sisteminde, 30 dakika boyunca farklı potansiyeller (0.5-2V) uygulanarak oluşan akımın, zamanla değişimleri belirlenmiştir. Elektrolit derişim etkisinin belirlenmesi için; değişik derişimde Etilen Glikol (EG) içeren (0.0; 0.1; 0.5; 0.6; 0.7; 1.0; 1.5 M), 0.4 M H 2 SO 4 çözeltileri kullanılmıştır. Korozyon davranışları ise %3.5 NaCl içerisinde elektrokimyasal impedans spektroskopisi, akım-potansiyel eğrileri yardımıyla araştırılmıştır. Elde edilen bulgulara göre; en uygun oksit kaplama potansiyeli 2V, katkı derişimi 0,5M Etilen Glikol (EG)"dur. Bu koşullarda oluşturulan oksit tabakasının korozyon direnci, 0.4M H 2 SO 4 "de elde edilene göre yaklaşık iki kat artmıştır.Anahtar Kelimeler: 7075 Aluminyum, Etilen Glikol, Korozyon, Gözenekli Oksit Filmi, Elektrokimyasal İmpedans Spektroskopisi THE DEVELOPMENT OF THE ALUMINUM OXIDE LAYER ON 7075 ALUMINUM ALLOY IN ETHYLENE GLYCOL+SULFURIC ACID ABSTRACTIn this study,we aimed to develop oxide layer on 7075 aluminum alloy (Al) in order to increase the corrosion resistance of Al. A conventional three-electrode system, which 7075Al is anode, a platinum sheet is cathode and Ag/AgCl (3M KCl) is reference electrode was used under atmospheric condition, at different potentials (0.5-2V) during 30 minutes. The current-time curves were obtained. Due to determine the effect of additive concentrations (0.0; 0.1; 0.5; 0.6; 0.7; 1.0; 1.5M) Ethylene Glycol (EG) containing in 0.4 M H 2 SO 4 were used. The corrosion behavior was investigated in 3.5% NaCl by electrochemical impedance spectroscopy,current-potential curves. The results showed that; the convenient potential is 2V and the most suitable EG concentration is 0.5M. The corrosion resistance of the oxide layer formed in this condition was increased about twice time compared to that obtained from 0.4 M H 2 SO 4 .

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“…The obtained coatings are normally thick and porous, so a sealing process is often needed to enhance the corrosion resistance [6]. The anodized surface is harder than aluminium but have only moderate wear resistance, which can be improved by applying of suitable sealing substances.…”

Section: Introductionmentioning

confidence: 99%

Influence of Aluminium Alloy Anodizing and Casting Methods on Structure and Functional Properties

Konieczny

Labisz

Polok-Rubiniec³

et al. 2016

Archives of Metallurgy and Materials

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This paper presents the influence of casting method and anodic treatment parameters on thickness and structure of an anodic layer formed on aluminium alloys. As test materials was used the aluminium alloy AlSi9Cu3, which was adopted to the casting process and anodic treatment. In this paper are presented the wear test results and metallographic examination, as well as hardness of non-anodised and anodised alloys subjected to anodising process. The investigations were performed using light and electron microscopy (AFM) for the microstructure determination. The morphology and size of the layer was also possible to determine. The anodising conditions for surface hardening and its influence on properties was analysed. The structure of the surface laser tray changes in a way, that there is a different thickness of the produced layer. The aluminium samples were examined in terms of metallography using the optical microscope with different image techniques as well as light microscope. Improving the anodization technology with appliance of different anodising conditions. Some other investigation should be performed in the future, but the knowledge found in this research concerning the proper process parameters for each type of alloy shows an interesting investigation direction. The combination of metallographic investigation for cast aluminium alloys – including electron microscope investigation – and anodising parameters makes the investigation very attractive for automobile industry, aviation industry, and others, where aluminium alloys plays an important role.

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The influence of cast method and anodizing parameters on structure and layer thickness of aluminium alloys

Cited by 45 publications

References 4 publications

Black anodic coatings for space applications: Study of the process parameters, characteristics and mechanical properties

Black anodic coatings for space applications: Study of the process parameters, characteristics and mechanical properties

Eti̇len Gli̇kol+sülfüri̇k Asi̇t İçeri̇si̇nde 7075 Alumi̇nyum Alaşimi Üzeri̇nde Alumi̇nyum Oksi̇t Tabakasinin Geli̇şti̇ri̇lmesi̇

Influence of Aluminium Alloy Anodizing and Casting Methods on Structure and Functional Properties

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