Localized corrosion behavior associated with Al7Cu2Fe intermetallic in Al-Zn-Mg-Cu-Zr alloy

Sun, Yuanwei; Pan, Qing‐Jiang; Sun, Yuqiao; Wang, Weiyi; Huang, Zaiwang; Wang, Xiangdong; Hu, Quan

doi:10.1016/j.jallcom.2018.12.151

Cited by 68 publications

(18 citation statements)

References 32 publications

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“…The impedance magnitude reflects the charge transfer ability of the sample surface. The higher impedance magnitude indicates that the electrode reaction is slower and the corrosion resistance is larger [ 42 , 43 , 44 ]. As shown in Figure 2 b, the impedance magnitude increases with the extended aging time at a low frequency, showing that the corrosion resistance of the alloy is improved.…”

Section: Resultsmentioning

confidence: 99%

Effects of Aging Treatment on Corrosion Behavior of a Tensile Deformed Al-Cu-Mn-Fe-Zr Alloy in 3.5% NaCl Solution

et al. 2021

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In this paper, the effects of an aging treatment on the corrosion resistance/mechanism of a tensile deformed Al-Cu-Mn-Fe-Zr alloy are investigated. The impedance magnitude and polarization resistance increase, while the corrosion current decreases with the increased aging time and temperature. The discontinuously-distributed precipitates and precipitation-free zone, which can cut the corrosion channels, appear at grain boundaries when the temperature is relatively high and the aging time is relatively long. They can improve the corrosion resistance. Additionally, the intergranular and pitting corrosion are the main mechanisms. The intergranular corrosion is likely to occur in an under-aged alloy. This is because the potential difference between the grain boundaries and grains is high, due to the segregation of Cu atoms. When the aging degree is increased, the grain boundary precipitates reduce the potential difference, and the intragranular precipitates make the surrounding matrix prone to dissolution. As such, the pitting corrosion is likely to occur in the over-aged alloys.

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Section: Resultsmentioning

confidence: 99%

Effects of Aging Treatment on Corrosion Behavior of a Tensile Deformed Al-Cu-Mn-Fe-Zr Alloy in 3.5% NaCl Solution

et al. 2021

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“…Intermetallic particles could play important roles in the corrosion process, especially in the early development of pitting. [ 14,25 ] According to the EXCO immersion experiments (Figures 6 and 7), preferential etching formed around micron‐scale Al(Fe,Mn,Si) particles in both HAZ and WNZ samples. The self‐corrosion potential of Fe‐containing particles in chloride solution is higher than that of the aluminum matrix.…”

Section: Discussionmentioning

confidence: 99%

“…The self-corrosion potential of Fe-containing particles in chloride solution is higher than that of the aluminum matrix. [14,26] Consequently, these particles act as a cathode to promote the dissolution of the matrix nearby.…”

Section: Effect Of Micron-scale Intermetallic Particles On Corrosion Propertymentioning

confidence: 99%

“…The corrosion property of Al alloys was revealed to have a close relationship with second-phase particles. [13][14][15] On account of the high alloying degree, second-phase particles in Al-Zn-Mg-based alloys include precipitates and intermetallic particles. According to Wang et al, [16] 7A09 alloy showed a lower corrosion resistance to intergranular corrosion ascribed to the preferential dissolution of grain boundary precipitates (GBPs).…”

Section: Introductionmentioning

confidence: 99%

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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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“…These researches mainly can be divided into three aspects: Corrosion mechanism, phase structure, size and distribution of phase. For instance, Yuanwei Sun, et al [13] investigated the localized corrosion behavior of Al 7 Cu 2 Fe phase in Al-Zn-Mg-Cu-Zr alloy. Atomic force microscopy was used to measure the potential difference between Al 7 Cu 2 Fe phase and Al matrix, the result shows that the Al 7 Cu 2 Fe phase acts as cathode expect to the Al-matrix during the Intergranular Corrosion test.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Secondary Phase on the Corrosion of Al-Zn-Mg-Cu Alloy

Chen¹,

Zhang²,

Li³

2020

Int J Metall Met Phys

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A non-heat treatment way was applied to study the effect of the secondary phase on the corrosion of Al-Zn-Mg-Cu alloy in order to exclude the effect of variation of grain size. The area ration of corrosion pits and secondary phase (150 samples) was used to characterize the corrosion degree of secondary phase after Intergranular Corrosion test for a constant period. Then the effect of size and distribution of secondary phase was determined by using the SEM-EDS and EPMA equipment, the Electrochemical test and the Image-pro plus software after immersion test. The results show that the corrosion resistance of Al-Zn-Mg-Cu alloys is positive related to the size of secondary phase. The sparse or dense phase distribution on and within grain boundary retard the pit initiate and extend along the grain boundary, so it increases the corrosion resistance of Al-Zn-Mg-Cu alloy.

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Localized corrosion behavior associated with Al7Cu2Fe intermetallic in Al-Zn-Mg-Cu-Zr alloy

Cited by 68 publications

References 32 publications

Effects of Aging Treatment on Corrosion Behavior of a Tensile Deformed Al-Cu-Mn-Fe-Zr Alloy in 3.5% NaCl Solution

Effects of Aging Treatment on Corrosion Behavior of a Tensile Deformed Al-Cu-Mn-Fe-Zr Alloy in 3.5% NaCl Solution

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

Effect of the Secondary Phase on the Corrosion of Al-Zn-Mg-Cu Alloy

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