The effect of Cu and Sc on the localized corrosion resistance of Al-Zn-Mg-X alloys

Liu, Li; Jia, Ying-Ying; Jiang, Jian-Tang; Zhang, Bo; Li, Guoai; Shao, Wen‐Zhu; Zhen, Liang

doi:10.1016/j.jallcom.2019.05.189

Cited by 64 publications

(9 citation statements)

References 38 publications

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“…It can be clearly seen that the corrosion occurred around the primary Al 3 (Sc 1−x Zr x ) particle with an obvious IGC characteristic. It has been confirmed that Al 3 (Sc 1−x Zr x ) phases possess a more positive potential than the aluminum matrix and GBPs [ 15 , 34 , 48 ]. As a result, the Al 3 (Sc 1−x Zr x ) phase particles will act as the cathode while GBPs act as the anode during the electrochemical process.…”

Section: Discussionmentioning

confidence: 99%

“…Another method is to inhibit the recrystallization process of deformed aluminum, because the low-angle grain boundaries (LAGBs) within non-recrystallized grains are more resistant to corrosion than the high-angle grain boundaries (HAGBs) within recrystallized grains [ 11 , 12 ]. The addition of minor elements such as Sc and Zr can be used for recrystallization inhibition and can finally promote the improvement of corrosion resistance, which has been continuously reported in the recent literature [ 13 , 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

“…The previous works mainly focused on the overall performance of SCC of the Al alloy materials with some shapes such as the sheet or the bar [ 13 , 14 , 16 , 18 ], or focused on the IGC performance of the material surface layer [ 13 , 15 ]. However, the researchers paid much less attention to the effect of gradient microstructures within a material from the surface layer to the central layer on the corrosion behavior.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Sc and Zr Additions on Recrystallization Behavior and Intergranular Corrosion Resistance of Al-Zn-Mg-Cu Alloys

Xia

Wang²,

Huang

et al. 2021

Materials

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The recrystallization and intergranular corrosion behaviors impacted by the additions of Sc and Zr in Al-Zn-Mg-Cu alloys are investigated. The stronger effect of coherent Al3(Sc1−xZrx) phases on pinning dislocation resulted in a lower degree of recrystallization in Al-Zn-Mg-Cu-Sc-Zr alloy, while the subgrain boundaries can escape from the pinning of Al3Zr phases and merge with each other, bringing about a higher degree of recrystallization in Al-Zn-Mg-Cu-Zr alloy. A low degree of recrystallization promotes the precipitation of grain boundary precipitates (GBPs) with a discontinuous distribution, contributing to the high corrosion resistance of Al-Zn-Mg-Cu-Sc-Zr alloy in the central layer. The primary Al3(Sc1−xZrx) phase promotes recrystallization due to particle-stimulated nucleation (PSN), and acts as the cathode to stimulate an accelerated electrochemical process between the primary Al3(Sc1−xZrx) particles and GBPs, resulting in a sharp decrease of the corrosion resistance in the surface layer of Al-Zn-Mg-Cu-Sc-Zr alloy.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Sc and Zr Additions on Recrystallization Behavior and Intergranular Corrosion Resistance of Al-Zn-Mg-Cu Alloys

Xia

Wang²,

Huang

et al. 2021

Materials

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“…It was also reported that the addition of minor alloying elements can affect the corrosion behavior due to the increasing complexity of second‐phase particles. [ 18,19 ] Cu and Mn elements are microalloying elements commonly found in Al–Zn–Mg‐based alloys, which have a satisfactory strengthening effect. [ 20,21 ] However, the effects of the Mn or Cu/Mn on the corrosion property of these alloys have rarely been reported.…”

Section: Introductionmentioning

confidence: 99%

Effect of second‐phase particle on localized corrosion in Al–Zn–Mg–Cu–Mn alloy friction stir welded joint

Dai

Wei

Huang

et al. 2020

Materials & Corrosion

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The microstructure and corrosion behavior of a high‐strength Al–Zn–Mg–Cu–Mn alloy friction stir welded (FSWed) joint were investigated using scanning electron microscope, transmission electron microscope, open‐circuit potential test, and potentiodynamic polarization. The weld nugget zone and heat‐affected zone (HAZ) of the FSWed joint showed diverse microstructural characteristics including micron‐scale intermetallic particles and nanoscale precipitates, leading to different localized corrosion sensitivities. The results of electrochemical tests confirmed the regional difference of corrosion in FSWed joints. Detailed research on the corrosion process revealed that micron‐scale Al(Fe,Mn,Si) particles promoted the dissolution of the vicinal matrix to induce pitting corrosion. The directionally distributed intermetallic particles and grain boundary precipitates in HAZ conduced to the development of intergranular microcracks into exfoliation. The matrix precipitates affected the localized corrosion tendency due to regional variation of the redissolution degree.

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“…Al–Li–Cu–Zr alloys (ie, the 2xxx system) are one of the main Al–Li alloys currently used . It is formed by adding appropriate amounts of Cu and Zr to improve the strength and plasticity and decrease the width of the precipitate‐free zone (PFZ) of Al–Li alloy . The addition of a small amount of Sc can also further improve the comprehensive properties of Al–Li alloys.…”

Section: Introductionmentioning

confidence: 99%

Effect of different aging processes on the corrosion behavior of new Al–Cu–Li–Zr–Sc alloys

Peng

Pan

Cai

et al. 2019

Materials & Corrosion

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The intergranular corrosion and exfoliation corrosion behaviors of Al-Cu-Li-Zr-Sc alloys under different aging effects, such as single-stage aging, strain aging, and double-stage aging, were studied. Among the three aging treatments, single-stage aging resulted in the best resistance to corrosion, followed by double-stage aging; strain aging resulted in the worst corrosion resistance. A 3.5% precooling strain could increase the dislocation density, which promoted the precipitation of corrosion-prone T 1 phase and increased the corrosion driving force of the alloy. Double-stage aging made the precipitated T 1 phases finer and more uniform and reduced the number of equilibrium phases at grain boundaries, thus improving the corrosion properties of the alloy. The corrosion susceptibility of the alloy was attributed to the T 1 phase and precipitate-free zone (PFZ), and the underlying corrosion mechanism was revealed as preferential dissolution of the equilibrium phase at grain boundaries and its surrounding distortion zone, followed by expansion of the PFZ along the grain boundaries, resulting in the development of corrosion from the grain boundaries to the intragranular regions. K E Y W O R D SAl-Cu-Li alloys, corrosion, double-stage aging, single-stage aging, strain aging

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The effect of Cu and Sc on the localized corrosion resistance of Al-Zn-Mg-X alloys

Cited by 64 publications

References 38 publications

Effect of Sc and Zr Additions on Recrystallization Behavior and Intergranular Corrosion Resistance of Al-Zn-Mg-Cu Alloys

Effect of Sc and Zr Additions on Recrystallization Behavior and Intergranular Corrosion Resistance of Al-Zn-Mg-Cu Alloys

Effect of second‐phase particle on localized corrosion in Al–Zn–Mg–Cu–Mn alloy friction stir welded joint

Effect of different aging processes on the corrosion behavior of new Al–Cu–Li–Zr–Sc alloys

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