Characterization of high frequency welded aluminium microfin tube for heat exchangers

Zaffaroni, Giorgio; Mishin, Oleg; Ciucani, U. M.; Gundlach, Carsten; Nordlien, Jan Halvor; Ambat, Rajan

doi:10.1016/j.matchar.2021.110939

Cited by 3 publications

(3 citation statements)

References 14 publications

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“…Samples for Acidified Synthetic Sea Water testing (SWAAT), and the full immersion tests in alkaline electrolyte were the finished HF welded tube samples. The tubes with the outer clad and the inner core were manufactured by high-frequency (HF) welding process [13,14], details of the process and its effect on the microstructure have been reported elsewhere [15,16]. The tubes were cut to similar lengths of 30 and 6 cm for SWAAT and the full immersion tests, respectively, washed with neutral soap, rinsed, and finally dried after ethanol rinsing.…”

Section: Sample Preparationmentioning

confidence: 99%

“…However, as the scarfing process locally removes the outer sacrificial clad layer along the HF weld line, it risks the exposure of the core Al–1.1Mn material to the external service environment. This region of exposed core alloy along the weld line surface is termed as ‘devoid of clad area’ [16]. Consequently, due to the local clad removal, the sacrificial protectiveness and, therefore, corrosion resistance of the outer Al–1.2Zn layer might be altered.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion on high-frequency welded Al–1.1Mn–0.5Cu–0.1Ti micro-fin tubes externally cladded with Al–1.2Zn used for high-performance heat transfer applications

Zaffaroni

Gudla

Rizzo

et al. 2022

Corrosion Engineering, Science and Technology

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In this study, the corrosion behavior of high-frequency welded micro-fin tubes was investigated using a bi-layered material of Al-1.1Mn-0.5Cu-0.1Ti core alloy with 10% (∼65 µm) one side cladding of Al-1.2Zn alloy. Open-circuit potential, potentiodynamic anodic polarisation tests, zero resistance ammetry (ZRA) measurements, acidified synthetic seawater testing (SWAAT), and full immersion tests were employed to assess the corrosion behaviour of the material. To link the corrosion with microstructural features, scanning electron microscopy and energy-dispersive X-ray spectroscopy, focused ion beam microscopy, and scanning transmission electron microscopy were used. The results showed that the Al-1.2Zn alloy surface sacrificially dissolves, providing cathodic protection to the nobler underlying core material in acidic and neutral environments. Whereas a catastrophic corrosion on the Al-1.1Mn-0.5Cu-0.1Ti core surface (i.e. the devoid of clad surface area of width 220-350 μm) was seen when coupled with Al-1.2Zn in highly alkaline solutions.

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Section: Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Corrosion on high-frequency welded Al–1.1Mn–0.5Cu–0.1Ti micro-fin tubes externally cladded with Al–1.2Zn used for high-performance heat transfer applications

Zaffaroni

Gudla

Rizzo

et al. 2022

Corrosion Engineering, Science and Technology

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“…In this products, clad materials, bonded Al-Zn alloy to the surface layer by rolling, are used. 9 Additionally, Zn-sprayed Al alloys, created an Al-Zn alloy layer on the surface of the Al material through the heat generated during brazing, are used. 10 In these case, the Al substrate acts as the cathode, and the Al-Zn alloy layer on the surface acts as the anode to protect against corrosion and is therefore called a sacrificial anode material.…”

Section: Introductionmentioning

confidence: 99%

Anodic Dissolution during Electrorefining of Al–Zn Alloys in Lewis Acidic AlCl<sub>3</sub>–EmImCl Ionic Liquid

NUNOMURA,

MATSUSHIMA,

KYO

et al. 2024

Electrochemistry

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The anodic dissolution reaction of Al-Zn alloys containing a Zn solid solution in Lewis acidic AlCl 3 -1-ethyl-3-methyl-imidazolium chloride (EmImCl) ionic liquids at various potentials is investigated herein. An enrichment layer was formed on the anode surface after applying constant potentials of 0.3 and 0.7 V in the 60 mol%AlCl 3 -40 %EmImCl (60 % AlCl 3 ) electrolyte and 0.2 V in the 67 mol%AlCl 3 -33 %EmImCl (67 %AlCl 3 ) electrolyte. Consequently, metallic Zn was detected in the enriched layer using X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). Notably, in the 60 %AlCl 3 electrolyte, high-purity Al was obtained at a much nobler potential than the dissolution potential of pure Zn, suggesting that the anodic dissolution of Zn from the Al-Zn alloy into the electrolyte was difficult. When electrorefining Al-Zn alloy anodes containing a Zn solid solution using 60 %AlCl 3 , which has lower acidity than the 67 %AlCl 3 electrolyte, it is possible to increase the anodic potential from 0.2 to 0.7 V. At this higher potential, high-purity Al is obtained at the cathode.

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Study on magnetic pulse crimping process for joining large-diameter aluminum alloy tube/magnesium alloy shaft

Chen

Han

Cui

et al. 2023

Int J Adv Manuf Technol

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A structure for joining 6061T6 aluminum alloy tube and AZ31B magnesium alloy shaft via the magnetic pulse crimping process was proposed. The forming process, mechanical properties, failure modes, corrosion behaviors of the joint were studied. The results showed that the enormous Lorentz force drove the wall of aluminum alloy tube to move towards the groove of magnesium alloy shaft at high-velocity, thus realized mechanical locking and formed joint. Through torsion tests, it was found that the mechanical properties of the joint with different process parameters varied. There were two failure modes for joint: torsional separation and torsional crack. Specifically, discharge time, groove angle and discharge energy for torsional crack was respectively 1, 90°, 28 kJ and 3, 90°, 25kJ. The maximum torque was up to 961.99N•m under discharged twice, 90° groove angle and 25kJ discharge energy. Through neutral salt spray corrosion tests, it was found that the maximum torque only decreased by 28.03% after corrosion for 192h. It indicated that the corrosion resistance of joint was good relatively.

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Characterization of high frequency welded aluminium microfin tube for heat exchangers

Cited by 3 publications

References 14 publications

Corrosion on high-frequency welded Al–1.1Mn–0.5Cu–0.1Ti micro-fin tubes externally cladded with Al–1.2Zn used for high-performance heat transfer applications

Corrosion on high-frequency welded Al–1.1Mn–0.5Cu–0.1Ti micro-fin tubes externally cladded with Al–1.2Zn used for high-performance heat transfer applications

Anodic Dissolution during Electrorefining of Al–Zn Alloys in Lewis Acidic AlCl<sub>3</sub>–EmImCl Ionic Liquid

Study on magnetic pulse crimping process for joining large-diameter aluminum alloy tube/magnesium alloy shaft

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