Effect of alloy types on the anodizing process of aluminum

Tsangaraki‐Kaplanoglou, I.; Theohari, Stamatina; Dimogerontakis, Th.; Wang, Yar‐Ming; Kuo, Hong-Hsiang; Kia, Sheila F.

doi:10.1016/j.surfcoat.2005.07.065

Cited by 108 publications

(58 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Anodisation also requires careful surface pre-treatment steps, including cleaning, etching and polishing, which increase processing cost and time. The outcome of the anodisation treatment is also dependent on the alloy composition [6][7][8]; specifically, some alloys yield anodised films having poor characteristics.…”

Section: Introductionmentioning

confidence: 99%

HVOF-sprayed WC–CoCr coatings on Al alloy: Effect of the coating thickness on the tribological properties

Bolelli

Lusvarghi

Barletta

2009

Wear

View full text Add to dashboard Cite

a b s t r a c tThe microstructure, the micromechanical properties, the wear behaviour and the impact resistance of WC-CoCr cermet coatings, deposited onto an aluminium alloy substrate by High Velocity Oxygen-Fuel (HVOF) flame-spraying, were examined as a function of the coating thickness, which was varied between 50 m and 150 m by performing different numbers of scans of the HVOF torch in front of the substrate. The coatings became denser and significantly harder as the number of torch scans increased: the analysis of single WC-CoCr splats by combined SEM and Focused Ion Beam (FIB) techniques enabled the interpretation of the mechanisms underlying this phenomenon. In accordance to such densification, the sliding wear resistance increased with the number of torch scans, as abrasive grooving and brittle failure mechanisms were progressively suppressed. The resistance to cyclic impact was also enhanced. In comparison to anodised films, the WC-CoCr coatings appeared much more resistant against wear and cyclic impact; specifically, three torch scans seem enough to produce a coating having suitable characteristics.

show abstract

Section: Introductionmentioning

confidence: 99%

HVOF-sprayed WC–CoCr coatings on Al alloy: Effect of the coating thickness on the tribological properties

Bolelli

Lusvarghi

Barletta

2009

Wear

View full text Add to dashboard Cite

show abstract

“…The Gibbs free energies for oxide formation per equivalent of the elements relative to that of aluminum have been reported to be responsible for this behavior. [29][30][31] Given that AA5083-O alloy has a greater Mg content and lower Si and Fe contents compared with the AA6082-T6 alloy, it is logical to conclude that this may be the reason why the AA5083-O alloy and AA5083-O rich zones anodize at faster rates with consequent thicker oxide films. Similarly, since the Mg content is lower in the TMAZ regions of both alloys (particularly as pronounced in the MID-TMAZ) compared with the PM sides, the reduction in the oxide thicknesses in the TMAZ regions can be attributed to the elemental loss of Mg in particular.…”

Section: Resultsmentioning

confidence: 99%

Anodizing Behavior of Friction Stir Welded Dissimilar Aluminum Alloys

Donatus

Thompson

Zhou

2015

J. Electrochem. Soc.

View full text Add to dashboard Cite

The anodizing behavior of a dissimilar friction stir weld of AA5083-O and AA6082-T6 alloys in 4 M H 2 SO 4 solution has been investigated. The anodizing results show that the AA5083-O rich zones were more oxidized during anodizing compared with the AA6082-T6 rich zones. Interestingly, the nugget and the thermomechanically affected regions of the individual parent alloys showed significant reduction in porous anodic oxide thicknesses. Sputtering-deposition of pure aluminum on the weld, prior to anodizing, significantly minimized the variations in the oxide thicknesses across the weld. More importantly, this method prevented the boundary dissolution (associated with the activity of the Mg 2 Si phase) that is often observed after anodizing the dissimilar weld of the alloys. © The Author(s) 2015. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives 4.0 License (CC BY-NC-ND, http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is not changed in any way and is properly cited. For permission for commercial reuse, please email: oa@electrochem.org. [DOI: 10.1149/2.0651512jes] All rights reserved. Friction stir welding is a solid state joining process that employs the frictional heat generated as a result of the motion between a nonconsumable rotating tool and the work pieces to produce welds. In the last two decades, since its invention in 1991, friction stir welding has become a highly reliable joining technique based on its principal advantage of being able to produce welds in the solid state with low heat spread. [1][2][3] In the transport industry, lightweighting is highly desired as well as multi-functionality of components which can be readily achieved by using multi-material components. Friction stir welding can produce multi-material component welds with minimal defects compared with fusion welding techniques. However, a common feature of all welding process is that zonal heterogeneities are often generated with consequent galvanic cells in the welds, which will be particularly pronounced in welds of dissimilar materials. 4 These galvanic cells can lead to undesirable corrosion failures in service. In a bid to reduce corrosion susceptibilities in friction stir welds, post weld heattreatment/artificial aging, 3,5-7 laser surface melting, [8][9][10][11][12] cold sprayed aluminum 13 and micro-arc oxidation coating 14 have been employed in recent times. Whilst post weld heat-treatment has been reported to improve the corrosion resistance of certain friction stir welded aluminum alloys 3,7 and to improve the mechanical properties of the low-strength weld regions ,15 its suitability for in-service applications is in doubt because of the timing involved and the large structure sizes employed commercially.7 Laser surface melting has been reported to improve the corrosion resistance of friction stir welded aluminum alloys throu...

show abstract

“…It was found that during anodization of the AA6111 alloy, the stage of pore rearrangement, before the steady-state current stage, is almost completely missing as a result of enrichment of the alloying elements at the metal/oxide interface [59]. On the other hand, when the AA5080 alloy was anodized, no significant difference between the oxide formation on this substrate and high purity Al was found, however, the higher oxide growth rates were observed for the technical alloy [59].…”

Section: Anodic Alumina Growthmentioning

confidence: 99%

Synthesis of Nanoporous Anodic Alumina by Anodic Oxidation of Low Purity Aluminum Substrates

et al. 2015

View full text Add to dashboard Cite

The aim of this chapter is to present some recent findings on the fabrication of anodic aluminum oxide (AAO) layers by anodization of low purity aluminum substrates. The use of low purity, technical aluminum alloys, instead of high purity substrates, can significantly reduce the cost of AAO fabrication, however, this can also affect the structure and properties of as produced alumina layers. Here, we focused on the comparison of oxide layer growth on substrates with different Al contents, as well as on the new procedures used for the synthesis of well-ordered nanoporous oxides from technical aluminum alloys. Some applications of the formed nanoporous AAO layers are presented. IntroductionDuring the recent years nanomaterials have received significant attention due to many unique chemical and physical properties that make them promising materials for various modern applications. As a result, nanotechnology is now one of the most popular sciences which have opened a lot of new perspectives in almost all scientific disciplines [1]. Up to now, the main problem that limits the practical application of nanomaterials is a relatively high cost of nanofabrication [2]. That is why considerable research efforts focus on the design and control of novel nanostructures via innovative synthetic strategies. A big attention has been paid to development a simple and inexpensive method of nanofabrication that can be used not only in a laboratory scale but also could have some potential for a commercial-scale implementation. Among numerous strategies reported in the literature, one of the most popular method for fabricating nanostructured oxide layers on the metal surface is controlled anodic oxidation (anodization) of metals under

show abstract

Effect of alloy types on the anodizing process of aluminum

Cited by 108 publications

References 34 publications

HVOF-sprayed WC–CoCr coatings on Al alloy: Effect of the coating thickness on the tribological properties

HVOF-sprayed WC–CoCr coatings on Al alloy: Effect of the coating thickness on the tribological properties

Anodizing Behavior of Friction Stir Welded Dissimilar Aluminum Alloys

Synthesis of Nanoporous Anodic Alumina by Anodic Oxidation of Low Purity Aluminum Substrates

Contact Info

Product

Resources

About