Grain distinct stratified nanolayers in aluminium alloys

Donatus, Uyime; Thompson, G.E.; Zhou, Xiaorong; Alias, J.; Tsai, I-Ling

doi:10.1016/j.matchemphys.2016.12.021

Cited by 8 publications

(6 citation statements)

References 20 publications

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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: Resultssupporting

confidence: 57%

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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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Section: Resultssupporting

confidence: 57%

“…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 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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“…The etching procedure mostly involves an attack at the defect sites on the aluminum surface. The etchant can favor metal dissolution starting from defects and β’’ Mg 2 Si precipitates interface along crystallographic <100> directions, thus promoting a tunnelling corrosion morphology [ 50 ]. At low immersion times, the etching generates large micrometric steps.…”

Section: Resultsmentioning

confidence: 99%

Anticorrosion Superhydrophobic Surfaces on AA6082 Aluminum Alloy by HF/HCl Texturing and Self-Assembling of Silane Monolayer

2022

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In this paper, the tailoring of superhydrophobic surfaces on AA6082 aluminum alloy by chemical etching in an HF/HCl solution, followed by silane self-assembling, was applied for enhanced corrosion protection in the marine field. In particular, different etching times were considered in order to optimize the treatment effect. The results indicate that all the prepared surfaces, after silanization, were characterized by superhydrophobic behavior with a contact angle higher than 150°. The contact and sliding angles strongly depend on the surface morphology at varying etching times. The optimum was observed with an etching time of 20 s, where a microscale coral-like structure coupled with a homogeneous and ordered pixel-like nanostructure was obtained on the aluminum surface showing a Cassie–Baxter superhydrophobic behavior with a water contact angle of 180° and a sliding angle equal to 0°. All superhydrophobic surfaces achieved an enhanced corrosion protection efficiency and impedance modulus up to two orders of magnitude higher than the as-received AA6082 in simulated seawater.

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Grain distinct stratified nanolayers in aluminium alloys

Cited by 8 publications

References 20 publications

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

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

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

Anticorrosion Superhydrophobic Surfaces on AA6082 Aluminum Alloy by HF/HCl Texturing and Self-Assembling of Silane Monolayer

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