Influence of final annealing temperature on the microstructural evolution and corrosion resistance of a Sandwich multi-layered aluminum sheet

Yuan, Zhe; Tu, Yiyou; He, Han; Yuan, Ting; Zhang, Quancheng; Peng, Xiaoyong

doi:10.1088/2053-1591/aaee58

Cited by 7 publications

(6 citation statements)

References 11 publications

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“…C min (T w,in −T a,in ) (5) Additionally, the study investigated corrosion hot spots by analysing the velocity field.…”

Section: Variables Of Interestmentioning

confidence: 99%

“…The use of allaluminium alloys in heat exchanger construction is also advantageous in terms of corrosion resistance, effectively addressing the issue of galvanic corrosion present in conventional RTPF heat exchangers. However, despite the passive nature of aluminium alloys and the use of all-aluminium materials to mitigate galvanic corrosion, instances of corrosion in MCHE systems have been reported [1][2][3][4][5][6][7][8]. The majority of heat exchanger failures occur due to harsh operating environments.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Thermal Effectiveness and Crevice Corrosion Risk of Fin Geometry on All-Aluminum Microchannel Heat Exchangers

Ahmed

Nasrazadani

Sadat

2023

ARFMTS

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All-aluminum microchannel heat exchangers have recently gained popularity in the heating, ventilation, and air conditioning industry. Despite their attractive thermal performance design, these heat exchangers make coils used in automotive, commercial, and residential applications prone to crevice corrosion. This study uses high-fidelity conjugate heat transfer simulations to model a micro channel heat exchanger system that includes fins and tubes with crossflow to compare their thermal effectiveness to gain insight into potential crevice corrosion of the MCHE alloy. This study considers three fin geometries (louver, step, and saw) with the same tube and circular shape microchannel and identifies the corrosion hot spot and thermal effectiveness. A predicted flow field also identifies crevices between fins and tube surfaces as critical corrosion hot spots often associated with low-velocity regions. The crevice volumes for the louver, step, and saw fin shapes are calculated as respectively. Results also show that the same circular microchannel louver shape fin has higher effectiveness than the step and saw shape fin. The thermal effectiveness for microchannel tubes with louver, step, and saw shape fins are 0.337, 0.20737, and 0.2895, respectively.

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“…C min (T w,in −T a,in ) (5) Additionally, the study investigated corrosion hot spots by analysing the velocity field.…”

Section: Variables Of Interestmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of Thermal Effectiveness and Crevice Corrosion Risk of Fin Geometry on All-Aluminum Microchannel Heat Exchangers

Ahmed

Nasrazadani

Sadat

2023

ARFMTS

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“…The Al laminated sheet exposed has a comparable corrosion rate, and the main corrosion product of the non‐brazed laminated sheet is pitting. [ 24 ] Previous studies have highlighted the significance of comprehending the complex correlation between the processing conditions, microstructural changes, mechanical properties, and corrosion. These prior studies underscore the importance of understanding the intricate relationship between brazing conditions and microstructural evolution, thus emphasizing the need for comprehensive investigations to elucidate the underlying mechanisms governing the behavior of Al alloy composites with different annealing temperatures.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Mechanical, and Corrosion Performance of AA4343/AA3003/AA4343 Laminated Sheets Subjected to Cryorolling and Annealing

Samdane,

Guo,

Cui

et al. 2024

Adv Eng Mater

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The effects of cryorolling (CR), hot rolling (HR), and different annealing temperatures on the microstructure, mechanical, and corrosion performance of AA4343/AA3003/AA4343 laminated sheets are studied. Compared with the HR samples, the microstructure of the CR samples presents a significant decrease in the size of elongated grains and significantly large second‐phase particles Al(Mn, Fe)Si in the AA3003 alloy. Grains in CR samples subjected annealing at 200–300 °C become finer. Increasing to 400–550 °C, the grains begin to grow, and the Si is diffused into the core layer. A comparison of HR and CR processing reveals a significant increase in the yield strength from 153 to 209 MPa and the ultimate tensile strength from 168 MPa to 217 MPa of the laminated sheet. Potentiodynamic polarization measurements and immersion tests are conducted to assess the corrosion morphology. After being immersed in a 3.5% NaCl solution for two weeks, the clad surface of the laminated sheet exhibits uniform corrosion products and pitting corrosion, which shows the pitting corrosion depth of the CR sample improved compared to the HR sample. The study suggests that both CR and annealing can be useful for enhancing the mechanical properties, and corrosion morphology of laminated sheets.

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“…Kim et al [9] investigated the effect of final rolling reduction on the grain-structure evolution of three-layered A4343(clad)/A3003(core)/A4343(clad) aluminum brazing sheets; they noticed that the core of the 44% cold-rolled sample was composed of coarse, elongated grains, which were free from any substructure. Yuan et al [10] found that high-temperature (460 • C) final annealing significantly improved the brazing ability of 4343/3z23a/4343 multi-layered Al sheets and eliminated the erosion of the core layer during brazing.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Microstructural Evolution on the Brazeability of Two-Layer Al Sheets

et al. 2022

Self Cite

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In this study, the microstructural evolution and the interaction between the clad and the core alloys that occurs during the brazing process of two-layer Al sheets with equiaxed grains were examined. The study was carried out using optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron backscatter diffraction (EBSD) and glow discharge optical emission spectrometry (GDOES). The effects of microstructure on the brazing performances of two-layer sheets were clarified. Although the grains were fine and equiaxed before brazing, three typical microstructural evolutions happened during brazing, corresponding to three kinds of interactions between the clad and core alloys of the aluminum brazing sheets. In the alloys, which had either relatively uniform grain growth or no grain growth, the interaction between the clad alloy and the core alloy was weak; accordingly, they showed a smooth surface, an even microstructure, faint element mutual diffusion, and eventually good brazeability. Meanwhile, in the alloy with obvious abnormal grain growth (AGG), strain-induced liquid-film migration (SILFM) occurred when the energy was too low to cause strain-induced boundary migration (SIBM). This led to rough and uneven surface morphology, significant mutual diffusion, and surface segregation of elements; eventually, this produced the worst brazeability.

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Influence of final annealing temperature on the microstructural evolution and corrosion resistance of a Sandwich multi-layered aluminum sheet

Cited by 7 publications

References 11 publications

Comparison of Thermal Effectiveness and Crevice Corrosion Risk of Fin Geometry on All-Aluminum Microchannel Heat Exchangers

Comparison of Thermal Effectiveness and Crevice Corrosion Risk of Fin Geometry on All-Aluminum Microchannel Heat Exchangers

Microstructure, Mechanical, and Corrosion Performance of AA4343/AA3003/AA4343 Laminated Sheets Subjected to Cryorolling and Annealing

The Effect of Microstructural Evolution on the Brazeability of Two-Layer Al Sheets

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