Influence of grain boundaries misorientation angle on intergranular corrosion in 2024-T3 aluminium

Bałkowiec, A.; Michalski, J.; Matysiak, H.; Kurzydłowski, Krzysztof J.

doi:10.2478/s13536-011-0050-4

Cited by 20 publications

(6 citation statements)

References 12 publications

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“…Similar selective attack associated with grain boundaries has been observed in particle-free Al 42 . It is generally assumed that highangle grain boundaries are more susceptible to localized corrosion attack than low angle grain boundaries 43,44 . However, both high and low-angle grain boundaries and dislocation boundaries showed signs of preferential attack, see Fig.…”

Section: Discussionmentioning

confidence: 99%

Revealing the growth kinetics of atmospheric corrosion pitting in aluminum via in situ microtomography

Noell

Schindelholz

2020

npj Mater Degrad

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Understanding the mechanistic relationship between the environment, microstructure, and local kinetics of atmospheric corrosion damage remains a central challenge. To address this challenge, this study used laboratory-based X-ray tomography to directly observe attack in-operando over an extended period, enabling insights into the evolving growth kinetics and morphology of individual pits over months of exposure. Damage progression associated with nine pits in a 99.9% pure aluminum wire exposed to chloride salts in humid air was characterized. Most pits grew at a nominally linear rate up until pit death, which occurred within 12–24 h of nucleation. Exceptions to this were observed, with three pits exhibiting bimodal growth kinetics and growing for 40 or more hours. This was explained by secondary droplets that formed near the pits, increasing the cathode area. A corrosion-driven drying mechanism likely contributed to pit death in both cases. Pits first grew into the material followed by lateral expansion.

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Section: Discussionmentioning

confidence: 99%

Revealing the growth kinetics of atmospheric corrosion pitting in aluminum via in situ microtomography

Noell

Schindelholz

2020

npj Mater Degrad

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“…Indeed, we demonstrated that LAGBs were almost as susceptible as HAGBs (random and CSL HAGBs) to IGC initiation, and intrinsically less susceptible to corrosion propagation than RHAGBs and CSL HAGBs, 58,60 in agreement with other authors. 32,[61][62][63] However, we showed that cyclic tests led to a strong increase in the susceptibility of LAGBs to IGC initiation and propagation. 58 This was partly explained by the effect of chloride concentration.…”

Section: Discussionmentioning

confidence: 70%

Comparative Study of Techniques and Methods Used to Characterize Intergranular Corrosion in AA2024 Aluminum Alloy

Mondou,

Duployer,

Tenailleau

et al. 2023

J. Electrochem. Soc.

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Three methodologies, i.e., optical microscope (OM) observations, analyses using tomography without synchrotron radiations, and mechanical tests, were used, and their relevancy compared to provide a quantitative description of the intergranular corrosion (IGC) damage. The study was performed on three plates of 2024 aluminum alloy, to take into account variations in the microstructure of the material, using two types of exposure conditions, i.e. continuous immersions and cyclic tests. The resolution of tomography was too low to allow an analysis at the scale of the elementary IGC defects. For thin plates with recrystallized grains, the corrosion damage corresponded mostly to intragranular corrosion, and OM observations were the most relevant technique to quantify correctly this damage. Thicker plates were mainly affected by IGC. Continuous immersion tests led to slightly branched IGC defects and low hydrogen uptake, and OM observations provided an accurate description of the IGC damage that corresponded mainly to a geometrical one. However, combining OM observations and mechanical tests was required for a full description of the IGC damage after cyclic tests that were associated with a strong branching of the IGC defects, i.e. geometrical damage, and significant hydrogen uptake, i.e., a non-negligible volume damage.

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“…It has been noted many times [ 42 , 44 ] that grain refinement and translation of the system into a non-equilibrium state by SPD methods lead to an increased rate of corrosion in general. It is noted [ 45 , 46 ] that low-angle boundaries have higher corrosion resistance than high-angle ones. EBSD analysis shows that the fraction of high-angle boundaries after reduction–ECAP in MA2 alloy is 72%.…”

Section: Discussionmentioning

confidence: 99%

Effects of Severe Plastic Deformation and Ultrasonic Treatment on the Structure, Strength, and Corrosion Resistance of Mg-Al-Zn Alloy

et al. 2022

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Nowadays, there is a great demand for increasing the strength and corrosion resistance of magnesium alloys for their wider use in machine engineering, oil industry, and medicine. This paper is devoted to a study on the effects of the combined process of reduction and equal channel angular pressing, as well as the subsequent ultrasonic irradiation on the structure, strength, and corrosion properties of the Mg-Al-Zn alloy. Deformation processing results in an increase of the strength up to 280 ± 10 MPa. A fine-grained structure is formed with a grain size of 10–20 µm and small recrystallized grains 1–2 µm in size. The corrosion resistance in the HCl medium falls down significantly. Action of ultrasound on the deformed specimen leads to an increased fraction of high-angle boundaries, in particular, the fractions of special, fully overlapping Σ13a boundaries and twin boundaries of Σ15b and Σ17a systems. Due to the ultrasonic treatment, the strength of the Mg-Al-Zn alloy increases up to 310 ± 5 MPa, while the corrosion resistance in HCl almost doubles.

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Influence of grain boundaries misorientation angle on intergranular corrosion in 2024-T3 aluminium

Cited by 20 publications

References 12 publications

Revealing the growth kinetics of atmospheric corrosion pitting in aluminum via in situ microtomography

Revealing the growth kinetics of atmospheric corrosion pitting in aluminum via in situ microtomography

Comparative Study of Techniques and Methods Used to Characterize Intergranular Corrosion in AA2024 Aluminum Alloy

Effects of Severe Plastic Deformation and Ultrasonic Treatment on the Structure, Strength, and Corrosion Resistance of Mg-Al-Zn Alloy

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