Characterization of intergranular corrosion defects in a 2024 T351 aluminium alloy

Bonfils-Lahovary, Marie-Laëtitia de; Laffont, Lydia; Blanc, Christine

doi:10.1016/j.corsci.2017.02.020

Cited by 64 publications

(38 citation statements)

References 39 publications

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“…In addition, intermetallic particles and anodic sites [16] lead to the preferential dissolution of more active sites, including the matrix and precipitate-free zone (PFZ) [17], as they are often present as cathodes and protected in the electrochemical corrosion process. With excessive Si and Cu addition, the formation of Si-rich or Cu-containing precipitates introduced to improve mechanical properties are not conducive to improving the corrosion performance of the alloy [18,19]. These precipitates often act as unfavourable electrochemical heterogeneities for corrosion resistance, related to pitting corrosion and IGC attack.…”

Section: Introductionmentioning

confidence: 99%

Study of the Precipitation Hardening Behaviour and Intergranular Corrosion of Al-Mg-Si Alloys with Differing Si Contents

Zheng

Luo

Bai

et al. 2017

Metals

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The effects of Si addition on the precipitation hardening behaviour and evolution of intergranular corrosion (IGC) of Al-Mg-Si alloys were investigated using hardness tests, scanning electron microscopy (SEM), potentiodynamic polarization measurements, and high-resolution transmission electron microscopy (HRTEM). With an increase of the Si content, the peak hardness of the Al-Mg-Si alloys considerably increased by enhancing the density of the β" (Mg 5 Si 6) phase inside the grains. The microstructures affecting the IGC performance consisted of MgSi particles, Si particles, Al-Fe-Mn-Si intermetallics, and the precipitate-free zone (PFZ). The IGC susceptibility of the Al-Mg-Si alloys was mainly attributed to the high electrochemical potential difference between the MgSi particles and solute-depleted zones. Excess Si improved the IGC susceptibility of the alloys, mainly due to an increase of the grain boundary MgSi precipitates. Furthermore, the evolution of the IGC process was discussed in detail.

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Section: Introductionmentioning

confidence: 99%

Study of the Precipitation Hardening Behaviour and Intergranular Corrosion of Al-Mg-Si Alloys with Differing Si Contents

Zheng

Luo

Bai

et al. 2017

Metals

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“…This induces an acidification of the electrolyte trapped inside the IGC defects. Further, previous studies showed the formation of a thin metallic Cu-nanoparticles layer at the interface alloy-IGC defect [20], that could be due to dissolution of the Cu-rich intergranular precipitates [19,21], and/or to the matrix dissolution [22]. This Cu-rich layer could protect the interior of the attacked grains from further corrosive environment in AA 2024 [19,23,24].…”

Section: Introductionmentioning

confidence: 89%

“…However, Cu could also provide effective cathodic support for oxygen and/or protons reduction on the walls of the IGC defects [24]. Bonfils et al showed hydrogen (H) penetration inside the material during the corrosion processes with H amount reaching 20 ppm and even 120 ppm after 30 and 500 h of exposure to a 1 M NaCl solution, respectively [25]. Similarly, Larignon et al have shown that H can be detected at HAGB and LAGB in corroded AA 2024 samples by scanning kelvin probe force microscopy (SKPFM) [26].…”

Section: Introductionmentioning

confidence: 99%

Influence of hydrogen on the propagation of intergranular corrosion defects in 2024 aluminium alloy

Bonfils-Lahovary

Josse²,

Laffont

et al. 2019

Corrosion Science

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To study the influence of hydrogen on the intergranular corrosion mechanism of a 2024 aluminium alloy, samples were hydrogen precharged by cathodic polarisation and then exposed to a NaCl solution. EBSD analyses and SEM observations showed that hydrogen increased the number of corroded interfaces and led to the embrittlement of low-angle grain boundaries which were not susceptible to corrosion without hydrogen precharging. The increase of the reactivity of the 2024 aluminium alloy in the presence of hydrogen gave a new insight into the intergranular corrosion mechanism: corrosion-induced hydrogen promoted the intergranular corrosion propagation and partially controlled the corrosion defect morphology.

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“…As reported by Costenaro et al 6 , aluminium alloys from the 2xxx series are very favorable for aircraft applications due to their low density, high mechanical resistance and durability. However, aluminium alloys present a high amount of intermetallics (IMs) leading to an increase of localised corrosion 7,8 . The IMs are formed during alloy solidification and their size and number in the metal matrix depend on several factors such as impurity content, chemical composition and the solid solution solubility 9 .…”

Section: Introductionmentioning

confidence: 99%

Corrosion and Micro-abrasive Wear Behaviour of 2524-T3 Aluminium Alloy with PAni-NPs/PSS LbL Coating

et al. 2019

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In this paper, we present an alternative method to obtain thin films for coating protection on the surface of the AA2524-T3 Al-alloy by using the Layer-by-Layer (LbL) technique. The LbL films were fabricated by alternated immersion of the Al-alloy into a poly(styrene sulfonate) (PSS) and polyaniline nanoparticles (PAni-NPs) solutions, obtaining a PAni-NPs/PSS bilayer architecture. The LbL films were characterized by ultraviolet-visible spectroscopy (UV-Vis), Fourier-transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), electrochemical and micro-abrasive wear tests. The results show that the number of bilayers promotes shifts to less negative potentials, indicating an optimized system, in which the best performance was observed for a 15-bilayer PAni/PSS LbL film. The pitting potential (E pit) values shifted 130 mV (from-610 mV to-480 mV) in comparing a bare Al-alloy. The predominantly wear mechanism for AA2524-T3 with PAni-NPs/PSS bilayers was scratching whereas for the bare material there was an equivalence between scratching and rolling mechanisms. The results proved that the incorporation of PAni-NPS by the LbL method may be propitious as protective coating against corrosion in AA2524-T3 alloy.

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Characterization of intergranular corrosion defects in a 2024 T351 aluminium alloy

Cited by 64 publications

References 39 publications

Study of the Precipitation Hardening Behaviour and Intergranular Corrosion of Al-Mg-Si Alloys with Differing Si Contents

Study of the Precipitation Hardening Behaviour and Intergranular Corrosion of Al-Mg-Si Alloys with Differing Si Contents

Influence of hydrogen on the propagation of intergranular corrosion defects in 2024 aluminium alloy

Corrosion and Micro-abrasive Wear Behaviour of 2524-T3 Aluminium Alloy with PAni-NPs/PSS LbL Coating

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