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

Goueffon, Yann; Arurault, Laurent; Mabru, Catherine; Tonon, Claire; Guigue, Pascale

doi:10.1016/j.jmatprotec.2009.02.013

Cited by 74 publications

(47 citation statements)

References 33 publications

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“…As an example, after thermal cycling on aluminum alloys see that in groups 2XXX and 7XXX, some of these alloys have been observed. Therefore, anodizing provides the required optical properties to minimize thermal cycling temperatures and prevent overheating and undercooling in every part of equipment namely good temperature stability of onboard equipments [5] [6] [7] [8] [9]. In the International Space Station (ISS), the micrometeoroid and orbital debris shields are made from anodized aluminum because of its specific thermal properties.…”

Section: Introductionmentioning

confidence: 99%

Anodic Coating Characteristics of Different Aluminum Alloys for Spacecraft Materials Applications

El-Hameed¹,

Abdel‐Aziz²,

El-Tokhy³

2017

MSA

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Anodic oxide coatings on aluminum alloys are used for space environment applications. These provide specific thermo-optical properties to spacecraft surface. Fragments of these coatings lead to generate the contamination in satellites and affect the mission lifetime. The current work concerns studying of the anodic processes applied on aluminum and different groups of aluminum alloys as Al7075, Al2024 and Al6061. Experimental procedures are performed using sulfuric acid at different values of current density (1 -2 A/dm 2 ). The influence of the parameters of anodic film formation on the coating characteristics and layer thickness of aluminum alloys has been investigated. Reflectance and optical properties of the anodized aluminum alloy coatings are determined and found to be dependent on the alloying elements. Changes in anodic coating weight and film thickness of aluminium alloys with the process parameters as current density, temperature, time duration, acid concentration, and sealing system have been studied. Moreover, morphology and surface structure of the considered samples are carried out in attempt to understand the physical characteristics. The obtained results are compared and briefly outlined.

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Section: Introductionmentioning

confidence: 99%

Anodic Coating Characteristics of Different Aluminum Alloys for Spacecraft Materials Applications

El-Hameed¹,

Abdel‐Aziz²,

El-Tokhy³

2017

MSA

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“…The anodized surface is harder than aluminium but have only moderate wear resistance, which can be improved by applying of suitable sealing substances. Anodic films are normally much stronger and more adherent compared to types of paint and metal plating, they are unfortunately also more brittle, what makes them less likely to crack and less susceptible for aging and wear, but easier to cracking when applied thermal stress [7].…”

Section: Introductionmentioning

confidence: 99%

“…Anodic oxidation processes of aluminium are currently being developed mainly in order to increase competitiveness in the automobile, electronics, and other industries [7]. A strong competition for aluminium anodic oxidation process are the painting technologies (mainly powder spraying).…”

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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“…[3][4][5] In spite of many advantages, the PEO coatings are usually composed of relatively porous layers as a result of discharge breakdowns and gas evolution during the coating growth. Such an intrinsic porosity of the layer often compromises the barrier properties of even relatively thick coatings.…”

mentioning

confidence: 99%

“…2 The properties of PEO layers can be tuned for various applications such as biomedical, photocatalytic, thermal and decorative playing with composition of electrolytes and electrical parameters. [3][4][5] In spite of many advantages, the PEO coatings are usually composed of relatively porous layers as a result of discharge breakdowns and gas evolution during the coating growth. Such an intrinsic porosity of the layer often compromises the barrier properties of even relatively thick coatings.…”

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confidence: 99%

PEO Coatings with Active Protection Based on In-Situ Formed LDH-Nanocontainers

Serdechnova

Mohedano

Kuznetsov

et al. 2016

J. Electrochem. Soc.

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In the present work, for the first time Zn-Al layered double hydroxide (LDH) nanocontainers were grown in-situ on the surface and in the pores of plasma electrolytic oxidation (PEO) layer and then loaded with a corrosion inhibitor to provide active protection. The developed LDH-based conversion process ensures partial sealing of the pores and provides an effective corrosion inhibition on demand leading to increased fault-tolerance and self-healing properties. The structure, morphology and composition of the LDH-sealed PEO coatings on 2024 aluminum alloy were investigated using SEM, TEM/FIB, XRD and GDOES. Electrochemical impedance spectroscopy and scanning vibrating electrode techniques show a remarkable increase in the corrosion resistance and fault tolerance when PEO coating is sealed with a LDH-inhibitor treatment. Plasma electrolytic oxidation (PEO) is an advanced anodizing process which leads to the formation of ceramic-like coatings on the surface of many light alloys. The coatings form on the surface as a result of short-lived micro-discharges at high voltages in low-concentrated eco-friendly electrolytes.1 The oxide layers developed by PEO are usually hard, strongly-adherent to the substrate and confer both corrosion and wear resistance.2 The properties of PEO layers can be tuned for various applications such as biomedical, photocatalytic, thermal and decorative playing with composition of electrolytes and electrical parameters. [3][4][5] In spite of many advantages, the PEO coatings are usually composed of relatively porous layers as a result of discharge breakdowns and gas evolution during the coating growth. Such an intrinsic porosity of the layer often compromises the barrier properties of even relatively thick coatings. Moreover, the pores are larger as the coating thickness increases in many cases. Several attempts have been made to reduce or seal such porosity. Optimization of current/voltage regimes, 6,7 changing the electrolyte composition including systems with particles, 8,9 different post-treatments 10,11 and duplex coatings 12,13 were tried among other strategies. However, in spite of offering certain improvement to the barrier properties, none of these approaches ensures active protection. Without active protection, the acceptance of PEO coatings for many high demanding applications such as aeronautics is limited. In previous works, a post-treatment immersion of PEO coated Mg alloys into inhibitor containing solution was tried to achieve active protection. Ce 3+14 and 8-hydroxyquinoline 15 were used as corrosion inhibitors. Certain active protection effect was reported though the important issues related to uncontrollable release of inhibiting species were not considered.Recently, layered double hydroxides (LDH) have been widely investigated as environmentally-friendly containers for active corrosion protection of metals, in the form of conversion films [16][17][18][19] and as inhibiting pigments being incorporated into the polymer coatings. 20 The LDH particles offer a twofold effect of ab...

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

Cited by 74 publications

References 33 publications

Anodic Coating Characteristics of Different Aluminum Alloys for Spacecraft Materials Applications

Anodic Coating Characteristics of Different Aluminum Alloys for Spacecraft Materials Applications

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

PEO Coatings with Active Protection Based on In-Situ Formed LDH-Nanocontainers

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