Effects of magnetic field and rare earth addition on corrosion behavior of Al-3.0 wt% Mg alloy

Zhang, Xin; Wang, Zehua; Zhou, Zehua; Xu, Jianming

doi:10.1016/j.jallcom.2016.12.184

Cited by 26 publications

(10 citation statements)

References 25 publications

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“…This means that intermetallic fragmentation is the key factor in controlling the electrochemical properties of Al-10 wt% Ce alloy. This is in agreement with the available literature that discusses different Al-Ce alloys 16,18.…”

supporting

confidence: 93%

“…It has been reported that there is a galvanic cell between the intermetallic particles and the aluminum matrix. 18 This cell comes from the difference in potential between a/Al and of Al 11 Ce 3 phase, which encourages pitting of the surface at different positions. Considering the current study, fragmenting the intermetallic particles under the influence of ultrasonic vibrations was believed to affect the distribution and size of the pits.…”

Section: Microstructure Inside the Corroded Areamentioning

confidence: 99%

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Influence of Al11Ce3 Size and Distribution on the Electrochemical Properties of Sonoprocessed Al-10 wt.% Ce Alloy

2022

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Solidification of Al–Ce alloys under ultrasonic vibrations (Sonoprocessing) has a significant effect on the refining of Al11Ce3 intermetallic, which plays a key role in controlling the properties of this group of high-performance characteristics. In the current research, a group of as-received Al-10 wt% Ce alloys that were sonoprocessed under different temperatures was characterized. The influence of Al11Ce3 intermetallic size and distribution on the electrochemical properties of these alloys was investigated. Polarization tests in 3.5% NaCl solution were carried out and the recorded Tafel and impedance curves were studied. The corrosion test results were related to the microstructure characteristics as affected by sonoprocessing. Investigation of the as-received samples showed that ultrasonic vibrations broke the long lath-shaped particles of Al11Ce3 and obviously decreased their size and increased their surface area fraction. Sonoprocessing at the optimum temperature, 655 °C, reduced the Al11Ce3 particles size by 90% and enhanced their distribution in the matrix. This in its turn resulted in significant effects on their electrochemical behavior. Polarization tests showed that the corrosion rate of the un-sonoprocessed specimen decreased from ~ 0.00068 to 0.00006 mm/year after processing at the optimum condition (655 °C), and the polarization resistance increased from ~ 71 to 343 kΩ. By increasing the temperature of ultrasonic treatment beyond 655 °C, and the corresponding coarsening of the intermetallic particles, the corrosion rate slowly increased again, and concurrently, the polarization resistance decreased. The size and distribution of the intermetallic particles also influenced the formation of the corrosion pits, where the optimum sample showed shallow pits compared to those observed in the unprocessed specimen. This emphasizes the role of sonoprocessing in controlling the microstructure features and hence the electrochemical properties of Al-10 wt% Ce alloys.

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supporting

confidence: 93%

Section: Microstructure Inside the Corroded Areamentioning

confidence: 99%

Influence of Al11Ce3 Size and Distribution on the Electrochemical Properties of Sonoprocessed Al-10 wt.% Ce Alloy

2022

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“…Therefore, the cathode is used for Tafel extrapolation in the present study, and the corrosion current density ( i corr ) is determined. The method used in the present study is also reported in Zhang et al [ 10,18 ] and Wang et al [ 24 ] The corrosion potential ( E corr ) and corrosion current density ( i corr ) are shown in Table 2. Less negative corrosion potential and lower corrosion current density of an alloy exhibit its superior corrosion resistance.…”

Section: Resultsmentioning

confidence: 90%

“…Recently, many efforts have been made to solve the problem of β‐Al 3 Mg 2 precipitation along the grain boundaries in the conventional Al–Mg alloys, including adjusting the processing technologies [ 8–10 ] and microalloying. [ 11–14 ] The microalloying additions can either modify the fraction, the composition, and the growth kinetics of the β‐Al 3 Mg 2 phase or introduce the additional Mg‐rich phases.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the intergranular corrosion resistance of high Mg‐alloyed Al–Mg alloy by Y addition

Yan

Chen

et al. 2020

Materials & Corrosion

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Microalloying is thought to improve the performance of Al-Mg alloys commonly used in transport applications. The effect of Y addition (0-0.4%) on the microstructure, mechanical properties, and corrosion resistance of Al-9.2Mg-0.7Mn alloy is investigated for potential use in engineering applications. The generation of the β-Al 3 Mg 2 phase along the grain boundaries is suppressed in the as-cast alloy due to the formation of the AlMgY ternary phase. The average intergranular corrosion mass loss of the alloy with 0.1% Y addition decreases about 53.1% almost at no expense of mechanical performance in the as-rolled alloy after annealing. Moreover, the alloy with 0.1% Y addition shows the corrosion mass loss about 30.2% lower than the Y-free alloy in the sensitized state. The enhanced corrosion resistance of the alloy can be ascribed to the reduced β-Al 3 Mg 2 precipitation along the grain boundaries associated with Y addition.

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“…Therefore, the corrosion resistance of unidirectional rolled magnesium alloy plate is the worst. In addition, in the middle and low frequency region of 3 (b) Bode diagram, the impedance modulus of sample B is the largest, and the impedance modulus of the material in the low frequency region is inversely proportional to its electrochemical activity, while the electrochemical activity is inversely proportional to the corrosion resistance of the material [19]. Therefore, the corrosion resistance of the magnesium alloy plate after cross rolling is the best.…”

Section: Potentiodynamic Polarization Curvementioning

confidence: 96%

Effect of Cross Rolling on the Corrosion Resistance of AZ31 Magnesium Alloy

Huang¹,

Zou²,

Yang³

et al. 2020

Rev. Chim.

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The effect of different rolling methods on the microstructure and corrosion behavior of AZ31 magnesium alloy in a 3.5% NaCl solution was studied via potentiodynamic polarization scanning, constant current discharge and electrochemical impedance spectroscopy. Results show that the corrosion current densities of cross rolling and unidirectional rolling are 8.60�10-3 and 4.68�10-2 A/cm2, respectively. Their difference is 5.4fold, the charge transfer resistance of cross rolling is large, the corrosion of one-way rolling is more serious than that of cross rolling, the discharge performance of cross rolling is more stable, and the anode polarization is small. After cross rolling, the grain size of the plate is relatively uniform and the corrosion products are non-adherent and less, so it is easy to fall off from its surface, which increases the effective contact between the electrolyte and the alloy surface and has more stable discharge performance.

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Effects of magnetic field and rare earth addition on corrosion behavior of Al-3.0 wt% Mg alloy

Cited by 26 publications

References 25 publications

Influence of Al11Ce3 Size and Distribution on the Electrochemical Properties of Sonoprocessed Al-10 wt.% Ce Alloy

Influence of Al11Ce3 Size and Distribution on the Electrochemical Properties of Sonoprocessed Al-10 wt.% Ce Alloy

Enhancing the intergranular corrosion resistance of high Mg‐alloyed Al–Mg alloy by Y addition

Effect of Cross Rolling on the Corrosion Resistance of AZ31 Magnesium Alloy

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