Analysis of morphology and microstructure of Al2O3 layers

Skoneczny, W.

doi:10.1007/s11003-010-9285-1

Cited by 7 publications

(9 citation statements)

References 5 publications

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“…The layer thickness of surface layers formed by anodic oxidation of aluminium (corrosion resistance, hardness, abrasion resistance, decorative effects, etc.) has been optimized over the decades mainly due to the publication of new findings [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of the Influence of Factors Acting on the Layer Thickness Formed by Anodic Oxidation of Aluminium

et al. 2019

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The current practice in the field of anodic oxidation of aluminium and its alloys is based mainly on a set of partial empirical experiences of technologists obtained during surface treatment. The aim of the presented paper is deeper and more complex identification of the influence of chemical and technological factors acting during the anodic oxidation process especially on the thickness of the formed surface layer by the electrolysis method in a sulfuric acid solution. The current density was selected as the basic criterion for verification evaluation and analysis of experimentally obtained data, in accordance with Faraday’s laws. For current densities of 1 to 5 A·dm−2, the synergy of significant influence factors was identified, and mathematical and statistical models were then developed to predict the thickness of the surface layer with a relative accuracy of up to 10%. The presented paper does not only focus on the observation of the thickness of the surface layer desired by the customer, but also on the monitoring of this thickness in relation to the overall layer thickness of the coating.

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Section: Introductionmentioning

confidence: 99%

Experimental Analysis of the Influence of Factors Acting on the Layer Thickness Formed by Anodic Oxidation of Aluminium

et al. 2019

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“…They are vulnerable to corrosion, since the spontaneously formed oxide layer does not offer adequate corrosion resistance [4]. This excludes unprotected aluminium from demanding applications, necessitating specialised protection of aluminium [6].…”

Section: Introductionmentioning

confidence: 99%

“…This is a chemical surface engineering technique that oxidises and converts the surface of aluminium to a uniform and continuous alumina oxide film [7]. Alumina has a relatively high hardness (2.9 -5.9 GPa) and is chemically inert [4,6,8].…”

Section: Introductionmentioning

confidence: 99%

Optimising sulfuric acid hard coat anodising for an Al-Mg-Si wrought aluminium alloy

Bartolo

Sinagra

Mallia

2014

Materials Science-Poland

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This research evaluates the effects of sulfuric acid hard coat anodising parameters, such as acid concentration, electrolyte temperature, current density and time, on the hardness and thickness of the resultant anodised layers. A small scale anodising facility was designed and set up to enable experimental investigation of the anodising parameters. An experimental design using the Taguchi method to optimise the parameters within an established operating window was performed. Qualitative and quantitative methods of characterisation of the resultant anodised layers were carried out. The anodised layer's thickness, and morphology were determined using a light optical microscope (LOM) and field emission gun scanning electron microscope (FEG-SEM). Hardness measurements were carried out using a nano hardness tester. Correlations between the various anodising parameters and their effect on the hardness and thickness of the anodised layers were established. Careful evaluation of these effects enabled optimum parameters to be determined using the Taguchi method, which were verified experimentally. Anodised layers having hardness varying between 2.4 -5.2 GPa and a thickness of between 20 -80 µm were produced. The Taguchi method was shown to be applicable to anodising. This finding could facilitate on-going and future research and development of anodising, which is attracting remarkable academic and industrial interest.

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“…The analysis of microscopic images and physicochemical properties of Al 2 O 3 coatings has led to the creation of various theories on the structure and formation mechanism of the oxide layer, including those of Csokan [9], Keller et al (KHR) [10][11][12], Sulka [13,14] and Skoneczny [15]. The model proposed by Skoneczny [15] of the actual structure of the oxide coating layer obtained in a three-component SAS electrolyte, H 2 SO 4 , (CH 2 ) 4 (COOH) 2 , at temperatures ranging from 293 to 313 K and current densities of 2 to 4 A/dm 2 consists of a thin barrier layer directly adjoining the metal layer and a porous upper layer. Micropores formed as a result of aluminium oxide nanofibres contacting one another due to the formation of the columnar structure of a pore have an equilateral triangle shape where the sides have been replaced by an arc formed from a circular section.…”

Section: Introductionmentioning

confidence: 99%

“…Micropores formed as a result of aluminium oxide nanofibres contacting one another due to the formation of the columnar structure of a pore have an equilateral triangle shape where the sides have been replaced by an arc formed from a circular section. Energy interferences in the oxide layer and the local etching of grain boundaries of the substrate material and admixtures caused the formation of macropores [15].…”

Section: Introductionmentioning

confidence: 99%

The Finite Element Method in Tribological Studies of Polymer Materials in Tribo-Pair with the Oxide Layer

Kubica

Skoneczny

2013

Tribol Lett

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We present an approach to the analysis of mechanisms of the tribological contact of a thin Al 2 O 3 oxide layer formed under hard anodizing conditions on a plate made of the aluminium alloy EN AW-5251. The oxidation of the 50-lm ceramic layer was carried out for 60 min in a three-component electrolyte (SAS), a three-component electrolyte consisting of adipic, sulphuric and oxalic acid, at a temperature of 298.15 K and a current density of 3 A/dm 2. A three-dimensional oxide coating model, based on the computer analysis of images from a scanning electron microscope, is proposed. Tribological tests of stresses, strains and dislocations formed in the oxide layer and in the sample material (a block) were conducted. Modified polytetrafluoroethylene (TG15, TGK20/5, TMP12) and polyetheretherketone with carbon fibre and graphite were used as samples for tests in the tribological couple rider-plate of a linear reciprocating friction tester. A tribological couple modelled in the Solid Edge CAD programme was subjected to numerical analyses using the finite element method in the Autodesk Simulation Multiphysics programme under conditions consistent with actual conditions for contact pressures of 0.25, 0.50, and 1.0 MPa.

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Analysis of morphology and microstructure of Al2O3 layers

Cited by 7 publications

References 5 publications

Experimental Analysis of the Influence of Factors Acting on the Layer Thickness Formed by Anodic Oxidation of Aluminium

Experimental Analysis of the Influence of Factors Acting on the Layer Thickness Formed by Anodic Oxidation of Aluminium

Optimising sulfuric acid hard coat anodising for an Al-Mg-Si wrought aluminium alloy

The Finite Element Method in Tribological Studies of Polymer Materials in Tribo-Pair with the Oxide Layer

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