Effect of anodic oxidation on fatigue performance of 7075-T6 alloy

Cirik, E.; Genel, Kenan

doi:10.1016/j.surfcoat.2008.06.049

Cited by 87 publications

(69 citation statements)

References 29 publications

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“…It could be concluded that the crack initiation from corner edge cracking in A50 and that from pin-hole defects in coating in A10 specimens resulted in the lower fatigue strength than the substrate. The detrimental effect of anodizing on fatigue properties was also reported by E. Cirik et al 14) and A. Inoue et al, 15) where the lower fatigue strengths of anodized specimens were attributed to the defects in the coatings.…”

Section: Discussionsupporting

confidence: 61%

Effect of Interlayer Thickness on Fatigue Behavior in A5052 Aluminum Alloy with Diamond-Like Carbon/Anodic-Oxide Hybrid Coating

et al. 2015

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Anodic oxide layer was formed on A5052 aluminum alloy, and subsequently diamond-like carbon (DLC) was deposited to fabricate DLC/ anodic-oxide hybrid coating. Plane bending fatigue testes have been performed using the hybrid-coated specimens with different thicknesses of anodic-oxide interlayer. The interlayer thicknesses were 10 and 50 µm, where the thickness of DLC film was fixed as 3 µm. The specimens without coating, with DLC single layer and with anodic-oxide single layer were also used for comparison. The fatigue strengths of the specimens with anodic-oxide single layer were lower than those of the substrate without coating because the corner edge cracking or pin-hole defects could be fatigue crack initiation sites. However, when DLC was deposited on the anodic-oxide layer, fatigue strengths were improved. The hybridcoated specimens with the interlayer thickness of 10 µm had higher fatigue limit than the substrate and specimens with the interlayer thickness of 50 µm. Thin DLC layer with the thickness of 3 µm could have suppressed the cracking in interlayer, and led to the improvement of fatigue strengths than the substrate. When the interlayer became relatively thicker compared with the DLC film, such as 50 µm, DLC film could not suppress the cracking from the corner edge defects, resulting in the lower fatigue strengths in spite of the presence of hybrid coating.

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Section: Discussionsupporting

confidence: 61%

Effect of Interlayer Thickness on Fatigue Behavior in A5052 Aluminum Alloy with Diamond-Like Carbon/Anodic-Oxide Hybrid Coating

et al. 2015

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“…11(a) indicated by arrows, at the interface of coating and substrate and this delamination may be related to the interfacial shear strength as reported by Cirik and Genel (2008). Also the presence of irregularities ( Fig.…”

Section: Sem Observationssupporting

confidence: 59%

Influence of surface treatments on fatigue life of Al 7010 alloy

Shahzad

Chaussumier

Chieragatti

et al. 2010

Journal of Materials Processing Technology

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OATAO is an open access repository that co llects 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. The objective of the present work is to show the influence of machining and anodizing processes on fatigue life of alloy 7010-T7451. Two different cutting conditions were employed to obtain two different initial surface roughnesses. Degreasing, pickling and anodizing were then carried out. In the as machined condition, surface roughness is clearly effective in reducing fatigue life in this material. As the surface roughness increases fatigue life decreases and this effect is found to be more pronounced in high cycle fatigue where major portion of fatigue life is consumed in nucleating the cracks. Effects of pre-treatments, like degreasing and pickling employed prior to anodizing, on fatigue life of the given alloy were also studied. Fatigue curves showed that pickling had negative impact on fatigue life of specimens while degreasing showed no change in fatigue life. The small decrease in fatigue life of anodized specimens as compare to pickled specimens is attributed to brittle nature and micro-cracking of the coating. Scanning electron microscopic (SEM) examination revealed multi-site crack initiation for the pickled and anodized specimens. SEM examination also showed that pickling process attacked the grain boundaries and the inclusions present on the surface resulting in pits formation. These pits are of primary concern with respect to accelerated fatigue crack nucleation and subsequent anodized coating formation.

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“…But aluminum alloys cannot be used directly in space because of severe operating conditions. Aluminum has pilling -Bedworth ratio (P-B ratio) >1, due to which protective oxide layer is formed in air that provides protection against further surface oxidation 19 .This oxide layer is heterogeneous 20 and thin and its surface properties can be improved through electrochemical coatings 21 .…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Electrodeposited Aluminum Oxide Thin Films

Majid¹,

Riaz²,

Akram³

et al. 2013

Proceedings of the 2013 International Conference on Advanced Computer Science and Electronics Information

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-Aluminum Oxide (Al 2 O 3 ) deposition is being sought for application in space / aerospace as a barrier coating. Al 2 O 3 not only changes the mechanical properties of the aluminum based alloys, it acts as a barrier for harmful radiations. Ionizing radiations are harmful to electronic components, which runaway due to extra charge carriers being produced, used in the space vehicles. We are employing electro-deposition along with sol-gel deposition in order to produce these coatings. Both of the techniques are simple, cheap and scalable. The prepared films are characterized by Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) and X-Ray Diffraction (XRD) for their structural / microstructural properties. In this paper, these properties are correlated to the deposition conditions in order to optimize the conditions for the applications mentioned above. The initial results being presented here are very encouraging regarding the smoothness of the films and the grain / particle size achieved so far.

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Effect of anodic oxidation on fatigue performance of 7075-T6 alloy

Cited by 87 publications

References 29 publications

Effect of Interlayer Thickness on Fatigue Behavior in A5052 Aluminum Alloy with Diamond-Like Carbon/Anodic-Oxide Hybrid Coating

Effect of Interlayer Thickness on Fatigue Behavior in A5052 Aluminum Alloy with Diamond-Like Carbon/Anodic-Oxide Hybrid Coating

Influence of surface treatments on fatigue life of Al 7010 alloy

Preparation and Characterization of Electrodeposited Aluminum Oxide Thin Films

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