Influence of substrate microstructure on the growth of anodic oxide layers

Fratila‐Apachitei, Lidy E.; Terryn, Herman; Skeldon, P.; Thompson, G.E.; Duszczyk, J.; Katgerman, L.

doi:10.1016/j.electacta.2003.10.024

Cited by 127 publications

(101 citation statements)

References 32 publications

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“…Anodic porous film development in sulfuric and phosphoric acids was studied on rolled and AC-grained aluminum, with a similar pore ordering, perpendicular to the surface, being observed. The anodization of relatively pure aluminum and various aluminum alloys was studied in a sulfuric acid solution at 0 C [442], and the uniformity of oxide growth was seen to increase with the increasing purity of aluminum.…”

Section: Aluminum Pre-treatmentmentioning

confidence: 99%

“…For aluminum, this can be achieved by means of mechanical, chemical, or electrochemical polishing. Mechanical polishing of aluminum has been used rather sporadically to prepare a smooth surface before anodizing [252,390,442]. However, detailed TEM analyses of mechanically polished aluminum have shown the procedure incapable of producing a microscopically smooth and undeformed surface, even when conducted with great care [445].…”

Section: Aluminum Pre-treatmentmentioning

confidence: 99%

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Highly Ordered Anodic Porous Alumina Formation by Self‐Organized Anodizing

Sulka

2008

Nanostructured Materials in Electrochemistry

236

298

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Section: Aluminum Pre-treatmentmentioning

confidence: 99%

Section: Aluminum Pre-treatmentmentioning

confidence: 99%

Highly Ordered Anodic Porous Alumina Formation by Self‐Organized Anodizing

Sulka

2008

Nanostructured Materials in Electrochemistry

236

298

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“…Furthermore, the presence of Si and Fe impurities at the metal/oxide interface significantly reduces the oxide growth rate. The local accumulation of impurities on the alloy surface influences the local oxidation rates and, thus, the morphology of anodic oxide [53][54][55]77]. So, a specific microstructure of anodic oxide formed on the surface of the low-purity alloy (e.g., AA1050) can be explained in terms of the increased content of principal alloying elements (Fe and Si) in the barrier oxide layer in comparison to the alloy that results in the increased roughness of the metal/oxide interface.…”

Section: Formation Of Defects and Cracks In The Oxide Structurementioning

confidence: 99%

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

et al. 2015

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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

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“…Ultrasonic cleaning in isopropanol was performed prior to anodizing. The elemental and phase composition analyses, as well as the microstructural investigations of the alloys were previously performed and described [10].…”

Section: Aluminum Substratesmentioning

confidence: 99%

Thermal effects associated with hard anodizing of cast aluminum alloys

2006

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Hard anodizing of three different cast aluminum substrates (i.e. Al99.8 wt%, Al-10 wt% Si, Al-10 wt% Si-3.5 wt% Cu) was performed in 2.25 M H 2 SO 4 electrolyte at 0°C. The effects of substrate composition, current density and convection regime on electrode temperature evolution were investigated. Temperature transients followed the voltage transients during anodizing. At a current density of 6.0 A dm )2 , the electrode temperatures increased with alloying whereas at 30 A dm )2 the temperature reached a steady value around 65°C and severe oxide dissolution effects were visible on the surface of the anodized specimens. Further, at this current density and under forced convection regime, highest temperature values were recorded for the Al99.8 wt% substrate and were accompanied by fluctuations. Forced convection significantly reduced the electrode temperatures during the non-uniform oxide growth for all three compositions and increased the oxide layer thickness.

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Influence of substrate microstructure on the growth of anodic oxide layers

Cited by 127 publications

References 32 publications

Highly Ordered Anodic Porous Alumina Formation by Self‐Organized Anodizing

Highly Ordered Anodic Porous Alumina Formation by Self‐Organized Anodizing

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

Thermal effects associated with hard anodizing of cast aluminum alloys

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