The intergranular corrosion behavior of 6000-series alloys with different Mg/Si and Cu content

Zou, Yun; Liu, Qing; Jia, Zhihong; Xing, Yuan; Ding, Lipeng; Wang, Xueli

doi:10.1016/j.apsusc.2017.02.045

Cited by 77 publications

(29 citation statements)

References 22 publications

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“…These grain boundary precipitates observed in the TEM images consisted of two types of particles: (1) particles larger than 500 nm and (2) particles less than 100 nm, but only a few particles larger than 500 nm were found on the grain boundaries in these alloys. The large particles observed in all the alloys were Al-Fe-Si (Mn) dispersoids [40]. The numerous small rod-shaped particles on the grain boundaries in all three alloys were MgSi precipitates with sizes ranging from 0.1 μm-0.15 μm [40].…”

Section: Metals 2017 7 387 6 Of 12mentioning

confidence: 90%

“…The large particles observed in all the alloys were Al-Fe-Si (Mn) dispersoids [40]. The numerous small rod-shaped particles on the grain boundaries in all three alloys were MgSi precipitates with sizes ranging from 0.1 µm-0.15 µm [40]. However, the structure of these MgSi precipitates is not studied in this paper; this will be further investigated and discussed in future research.…”

Section: Metals 2017 7 387 6 Of 12mentioning

confidence: 91%

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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: Metals 2017 7 387 6 Of 12mentioning

confidence: 90%

Section: Metals 2017 7 387 6 Of 12mentioning

confidence: 91%

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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“…These precipitates are very common in these aluminum alloys . Corrosion resistance of Al–Mg–Si alloys depends critically on Si content and corrosion susceptibility increases with the addition of excess Si, as other authors have reported . These Si‐rich precipitates act as unfavorable electrochemical heterogenates reducing corrosion resistance.…”

Section: Resultsmentioning

confidence: 79%

Corrosion behavior of mechanically alloyed A6005 aluminum alloy composite reinforced with TiB₂ nanoparticles

Abu-warda

López

Escalera-Rodriguez

et al. 2019

Materials & Corrosion

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Corrosion susceptibility of the A6005 alloy reinforced with n‐TiB2 was studied through electrochemical tests. The mechanical alloying (MA) technique was used as the processing route and a posterior hot extrusion was employed to consolidate the powders. Bulk samples were characterized by X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, and microhardness tests. The combination of both MA processing and 5 wt% n‐TiB2 addition in the aluminum matrix produced 61% increase of microhardness. Electrochemical tests were performed in 3.5 wt% NaCl solution to assess the effect of MA processing and TiB2 presence on corrosion behavior. The corrosion resistance of the samples processed by MA increased slightly compared with the base A6005 alloy. The amorphous Al2O3 phase formed during MA processing was the cause of this increase, providing continuity to the passive layer. Furthermore, the addition of TiB2 on the sample processed by MA did not significantly affect corrosion resistance. Polarization tests confirmed that the reinforced sample had similar icorr to that of the unreinforced alloy, and cyclic polarization tests revealed that pit nucleation sites were localized in the interface between Al2O3 and the aluminum matrix.

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“…Several existing reports have discussed the results related to the IGC susceptibility of Cu containing Al‐Mg‐Si alloys. These authors suggested that precipitation of Q‐phase (Al 4 Cu 2 Mg 8 Si 7 ) at grain boundaries (GBP) of the Cu‐containing alloy increases the susceptibility to IGC because of the micro‐galvanic coupling between them and the less noble precipitate free zones .…”

Section: Resultsmentioning

confidence: 99%

Corrosion behavior of under‐, peak‐, and over‐aged 6063 alloy: A comparative study

Sekhar

Das

2019

Materials & Corrosion

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The mechanical property of age‐hardenable Al‐alloys is governed by the state of ageing, which determines the microstructure and consequently, their corrosion behavior which is a vital aspect for a number of applications. This article presents a comparative assessment of corrosion behavior of under‐, peak‐ and over‐aged Al‐Mg‐Si alloy. Corrosion characteristics have been determined via immersion tests in 0.1 M ortho‐phosphoric acid solution and intergranular corrosion (IGC) tests. Corroded surfaces are examined by field emission scanning electron micrographs‐energy dispersive spectroscopy and 3D optical profilometer. The obtained results reveal that the corrosion rate at a specific immersion time as well as the depth of IGC increases in the order for under‐, peak‐, and over‐aged states. Irrespective of the state of ageing, corrosion loss increases linearly but the rate of corrosion decreases rapidly with increasing immersion time. The dominant mode of corrosion in under‐aged alloy is identified as localized pitting, while peak‐aged is highly susceptible to IGC in contrast extensive pitting corrosion is observed for over‐aged alloy. The observed differences in corrosion behavior are explained considering characteristics of precipitates. Formation of β (Mg2Si) in case of over‐aged alloy and presence of inclusions like AlFeMnSi particles are found to accelerate pitting corrosion.

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The intergranular corrosion behavior of 6000-series alloys with different Mg/Si and Cu content

Cited by 77 publications

References 22 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

Corrosion behavior of mechanically alloyed A6005 aluminum alloy composite reinforced with TiB₂ nanoparticles

Corrosion behavior of under‐, peak‐, and over‐aged 6063 alloy: A comparative study

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The intergranular corrosion behavior of 6000-series alloys with different Mg/Si and Cu content

Cited by 77 publications

References 22 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

Corrosion behavior of mechanically alloyed A6005 aluminum alloy composite reinforced with TiB2 nanoparticles

Corrosion behavior of under‐, peak‐, and over‐aged 6063 alloy: A comparative study

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Product

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Corrosion behavior of mechanically alloyed A6005 aluminum alloy composite reinforced with TiB₂ nanoparticles