Droplet cell investigation of intergranular corrosion on AA2024

Bonzom, Rémy; Oltra, R.

doi:10.1016/j.elecom.2017.06.011

Cited by 8 publications

(6 citation statements)

References 12 publications

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“…Droplets have been commonly used as a typical electrolyte system for the study of the atmospheric corrosion of iron (Risteen et al, 2014), carbon steel (Han et al, 2013;Schindelholz et al, 2014;Wang et al, 2016), stainless steel (Hastuty et al, 2010;Wang et al, 2011;Cook et al, 2017;Guo et al, 2019), zinc (Azmat et al, 2011;Li and Hihara, 2014), aluminum alloy (Yan et al, 2016;Bonzom and Oltra 2017;Thomson and Frankel, 2017), and copper (Lin and Frankel, 2013). Despite historically being the focus of much research, atmospheric corrosion under droplets and its underlying mechanisms continues to require more accurate investigations.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Formation Mechanism of Microdroplets on Pure Iron

Tang

et al. 2021

Front. Chem.

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The electrochemical formation mechanism of microdroplets formed around a primary droplet of 3.5% NaCl solution on an iron-plated film was investigated by quartz crystal microbalance (QCM) and concentric three-electrode array (CTEA) measurements. During the initial stage, the microdroplets mainly originate from evaporation owing to cathodic polarization and electric current of the localized corrosion cell under the primary droplet. The maximal electrochemical potential difference between the anode and cathode was measured to be 0.36 V and acted as the driving force for the formation of microdroplets. The maximums of anodic and cathodic electric current density of pure iron under the NaCl droplet are 764 and −152 μA/cm2, respectively. Propagation of microdroplets in the developing stage attributes to horizontal movement of the electrolyte, water evaporation, and recondensation from primary and capillary condensation from moist air. The results of the study suggest that the initiation and propagation of microdroplets could promote and accelerate marine atmospheric corrosion.

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Section: Introductionmentioning

confidence: 99%

Electrochemical Formation Mechanism of Microdroplets on Pure Iron

Tang

et al. 2021

Front. Chem.

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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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“…It presents high damage-tolerance and excellent fatigue properties [1]. However, both the AA2024-T3 and AA2524-T3 alloys possess a large amount of intermetallic particles (IMCs) in their microstructure, and this is the main reason for their high susceptibility to localized corrosion such as pitting and stress corrosion cracking [3][4][5][6][7][8]. Localized corrosion in aluminium alloys uses to be caused by microgalvanic effects between IMCs and the matrix [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Corrosion Resistance of the AA2524-T3 and the AA2024-T3

Queiroz

Terada

Bugarin

et al. 2021

Metals

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The 2XXX Al alloys are characterized by their superior mechanical properties resulting from alloying elements and precipitation hardening treatments. The AA2524-T3 alloy was developed to replace the AA2024-T3 alloy in the aerospace industry. However, both alloys present many intermetallic particles (IMCs) in their microstructure, and this is the main reason for their high susceptibility to localized corrosion (such as pitting and stress corrosion cracking). Despite the similarities between these alloys (e.g., chemical composition and type of intermetallics) the literature comparing their properties is scarce and focuses mainly on their mechanical properties, not their corrosion resistances. In this investigation, the corrosion resistance of the AA2524-T3 alloy was compared to the AA2024-T3 alloy. The microstructure of both alloys was analyzed by Scanning Electron Microscopy before and after immersion in the test electrolyte, and the number and area fraction of intermetallics of each alloy was determined. The corrosion resistance of both alloys was monitored as a function of exposure time by electrochemical impedance spectroscopy and the results were fitted using electrical equivalent circuits. The AA2524-T3 alloy presented not only higher impedance values but also less corroded areas than the AA2024-T3 alloy.

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Droplet cell investigation of intergranular corrosion on AA2024

Cited by 8 publications

References 12 publications

Electrochemical Formation Mechanism of Microdroplets on Pure Iron

Electrochemical Formation Mechanism of Microdroplets on Pure Iron

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

Comparison of Corrosion Resistance of the AA2524-T3 and the AA2024-T3

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