Features in aluminium alloy grains and their effects on anodizing and corrosion

Donatus, Uyime; Thompson, G.E.; Elabar, D.; Hashimoto, Teruo; Morsch, Suzanne

doi:10.1016/j.surfcoat.2015.07.034

Cited by 23 publications

(7 citation statements)

References 44 publications

(49 reference statements)

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“…The SLC attacks penetrated as deep as 143 μm into the alloy (Figure 16f). The SEM image in Figure 16c shows that the propagation of the SLC was also affected by grain specific bands similar to the grain features revealed by Donatus et al [44,45]. Again, superficial dissolution of regions around some pit mouths, similar to what was revealed on the AA2050 alloy, were observed.…”

Section: Aa7050-t7451supporting

confidence: 77%

Corrosion Resistance of Precipitation-Hardened Al Alloys: A Comparison between New Generation Al-Cu-Li and Conventional Alloys

Donatus¹,

Bodunrin²,

Olayinka³

et al. 2021

Advanced Aluminium Composites and Alloys

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The corrosion resistance of conventional (AA2024-T3, AA6082-T6 and AA7050-T7451) and the new generation (AA2050-T84, AA2098-T351, AA2198-T8, and AA2198-T851) precipitation-hardened alloys has been studied and compared using electrochemical and non-electrochemical approaches. The AA6082-T6 was the most resistant alloy followed by the new generation Al-Cu-Li alloys, except the AA2050-T84. All the alloys exhibited pseudo-passivity, except for the AA2024-T3 alloy which presented the highest number of pitting sites per cm 2 and also exhibited the most insidious form of corrosion amongst the alloys tested. However, the alloy with the highest corrosion depth was the AA2050-T84 alloy followed by the AA2024-T3 and AA7050-T7451 alloys. Intergranular corrosion was associated with rapid rates of penetration. In addition to the microstructural features of the alloys before corrosion, the modes of localized corrosion in the alloys were also influenced by evolving microstructural features (such as re-deposited Cu) during corrosion.

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Section: Aa7050-t7451supporting

confidence: 77%

Corrosion Resistance of Precipitation-Hardened Al Alloys: A Comparison between New Generation Al-Cu-Li and Conventional Alloys

Donatus¹,

Bodunrin²,

Olayinka³

et al. 2021

Advanced Aluminium Composites and Alloys

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“…There is no T1‐depleted region as a result of selective dissolution. However, there are inherent T1‐rich bands which favour preferential severe localized corrosion initiation and propagation and defines the corrosion pathways along distinct layers . These bands are grain‐orientation dependent and are aligned parallel to the {111} Al.…”

Section: Resultsmentioning

confidence: 99%

“…These pathways are totally dependent on the orientation of the corroding grains with respect to the exposed surface area. This conclusion is derived from already reported works in the literature …”

Section: Resultsmentioning

confidence: 99%

The effect of surface pretreatment on the corrosion behaviour of silanated AA2198‐T851 Al‐Cu‐Li alloy

Donatus

Klumpp

Mogili

et al. 2018

Surface & Interface Analysis

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The corrosion behaviour of silanated AA2198‐T851 alloy substrates with and with no manufacturing‐process induced near‐surface deformed layer (MPI‐NSDL) has been investigated. Two methods (alkaline etching + desmutting and mechanical polishing) were employed in removing the MPI‐NSDL. Silanization was performed using 2‐bis‐triethoxysilylethane. Electrochemical impedance spectroscopy (EIS), salt spray test, and microscopy techniques were employed in the investigation of the corrosion behaviours. The studies revealed that polishing appeared to be the best silanating pre‐treatment (compared with degreasing and etching + desmutting) for the new generation AA2198‐T851 Al‐Cu‐Li alloy, and this was reflected in the EIS spectra. The etched + desmutted and the degreased surface with MPI‐NSDL did not respond well to silanization and presented more pitting sites per square millimeter. However, the severity of corrosion per pit was more on the polished sample compared with the other two. Also, the corrosion mechanisms were different for the three cases.

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“…e preparation time and costs for both versions were recorded and analysed. e anodised specimens were characterised using a ZEISS Ultra 55 eld emission scanning electron microscope (FE-SEM) equipped with an energy dispersive X-ray spectrometer (EDS), as reported previously [85]. e FE-SEM was operated under the InLens detector mode with 5 kV EHT in a high vacuum environment.…”

Section: Methodsmentioning

confidence: 99%

A Novel Methodology for Economical Scale-Up of TiO₂ Nanotubes Fabricated on Ti and Ti Alloys

Khaw

Curioni

Skeldon

et al. 2019

Journal of Nanotechnology

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The prospective use of nanotechnology for medical devices is increasing. While the impact of material surface nanopatterning on the biological response is convincing, creating a large surface area with such nanotechnology remains an unmet challenge. In this paper, we describe, for the first time, a reproducible scale-up manufacturing technique for creating controlled nanotubes on the surfaces of Ti and Ti alloys. We describe an average of approximately 7.5-fold increase in cost and time efficiency with regards to the generation of 20, 50, and 100 nm diameter nanotubes using an anodisation technique. These novel materials have great potential in the medical field through their influence on cellular activity, in particular, protein absorption, focal adhesion, and osteoinduction. In this paper, we provide a step-by-step guide to optimise an anodisation system, starting with design rationale, proof of concept, device upscaling, consistency, and reproducibility check, followed by cost and efficiency analysis. We show that the optimised device can produce a high number of anodised specimens with customisable specimen shape at reduced cost and time, without compromising the repeatability and consistency. The device can fabricate highly uniform and vertically oriented TiO2 nanotube layer with desired pore diameters.

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Features in aluminium alloy grains and their effects on anodizing and corrosion

Cited by 23 publications

References 44 publications

Corrosion Resistance of Precipitation-Hardened Al Alloys: A Comparison between New Generation Al-Cu-Li and Conventional Alloys

Corrosion Resistance of Precipitation-Hardened Al Alloys: A Comparison between New Generation Al-Cu-Li and Conventional Alloys

The effect of surface pretreatment on the corrosion behaviour of silanated AA2198‐T851 Al‐Cu‐Li alloy

A Novel Methodology for Economical Scale-Up of TiO₂ Nanotubes Fabricated on Ti and Ti Alloys

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Features in aluminium alloy grains and their effects on anodizing and corrosion

Cited by 23 publications

References 44 publications

Corrosion Resistance of Precipitation-Hardened Al Alloys: A Comparison between New Generation Al-Cu-Li and Conventional Alloys

Corrosion Resistance of Precipitation-Hardened Al Alloys: A Comparison between New Generation Al-Cu-Li and Conventional Alloys

The effect of surface pretreatment on the corrosion behaviour of silanated AA2198‐T851 Al‐Cu‐Li alloy

A Novel Methodology for Economical Scale-Up of TiO2 Nanotubes Fabricated on Ti and Ti Alloys

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A Novel Methodology for Economical Scale-Up of TiO₂ Nanotubes Fabricated on Ti and Ti Alloys