How microstructure affects localized corrosion resistance of stir zone of the AA2198-T8 alloy after friction stir welding

Machado, Caruline de Souza Carvalho; Donatus, Uyime; Milagre, Mariana Xavier; Araujo, João Victor de Sousa; Viveiros, Bárbara Victoria Gonçalves de; Klumpp, Rafael Emil; Pereira, Victor Ferrinho; Costa, Isolda

doi:10.1016/j.matchar.2021.111025

Cited by 13 publications

(4 citation statements)

References 48 publications

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“…The AA2198 alloy has been the object of numerous corrosion studies [4,11,30,42,43,88 93]. However, the behaviour of the coarse intermetallic particles during anodising has not yet been reported.…”

Section: Introductionmentioning

confidence: 99%

TSA anodising voltage effects on the near-surface coarse intermetallic particles in the AA2024-T3 and AA2198-T8 alloys

Araujo

Milagre

Klumpp

et al. 2022

Corrosion Engineering, Science and Technology

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In this study, the behaviour of the micrometric particles of the AA2198-T8 alloy during anodising at various voltages and the effect of anodising voltage on the anodised surface morphology have been investigated in a tartaric-sulfuric acid anodising solution. The results were compared with that of the AA2024-T3 alloy. For the AA2198-T8 alloy, partial dissolution of these particles occurred at 0, 3 and 4 V. Besides, for potentials above 5 V, there is a preferential dissolution of the intermetallic particles. For the AA2024-T3 alloy, the results indicated a total dissolution of the micrometric particles at 0 V and a partial dissolution at 3 V, whereas above 4 V total dissolution occurred. Between 1 and 2 V, no dissolution was observed for both alloys. The preferential dissolution of the micrometric particles resulted in defects in the anodic film and cavities on the anodised surfaces.

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Section: Introductionmentioning

confidence: 99%

TSA anodising voltage effects on the near-surface coarse intermetallic particles in the AA2024-T3 and AA2198-T8 alloys

Araujo

Milagre

Klumpp

et al. 2022

Corrosion Engineering, Science and Technology

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“…Primary α-Al phases with less alloying elements will solidify rst during friction stir welding of Al-Li alloys. Li, Mg, and Cu alloying elements, as well as Si and Fe impurities [23].…”

Section: Metallographymentioning

confidence: 99%

Investigation of stress corrosion cracking of friction stir welded 2060 Al-Li alloy

Yameen,

Hussain,

Afzal

et al. 2024

Weld World

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Aluminum lithium 2060 alloy is an ideal structural material for aeronautical components. Friction stir welding (FSW) of two-millimeter-thick 2060 Al-Li alloy plates under a welding speed of 600 mm/min and rotation speed of 400 rpm ourishes as better joining process. During FSW process, the three zones of weld nugget zone (WNZ), thermally mechanical affected zone (TMAZ) heat affected zone and base metal (BM) on the weld transverse cross section are classi ed caused by tool stirring and axial force in friction stir welded joints. BM shows that the microstructure is characterized by lamellar structures of the lathshaped α phase arranged along the rolling direction. The WNZ, with ne and equiaxed grains, is a typical feature of the recrystallized structures resulted from dynamic recrystallization due to severe plastic deformation and high temperature. The TMAZ, a transition zone surrounding the weld nugget experiences a combined action of friction heating and high bending. The equipment was designed and fabricated to investigate the stress corrosion cracking behavior in simulated environment. Electrochemical evolution of FSW Al-Li 2060 alloy in 3.5wt.% NaCl solution and performed open circuit potential, electrochemical impedance spectroscopy and cyclic polarization in unloaded condition and with applied load of 500, 1000 in speci c intervals (1, 24, 48) hours. Results show that poor corrosion resistance in unloaded condition and decrease with the speci c time interval. Results show that corrosion rate in unloaded 102, for 500 g load is 7.5 and for 1000g load is 48.76 in millimeter per year (mm/y).

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“…Souza et al studied localized corrosion resistance in friction stir welded joints of AA2198-T8 alloys. They found that in the stir region of these welded joints, the corrosion was intergranular and correlated to T2/TB phases precipitated at intergranular positions [46]. Jandaghi et al investigated the effects of heat treatment on dissimilar friction stir welded joints of AA2198-AA6013 alloys.…”

Section: Introductionmentioning

confidence: 99%

Influence of Process Parameters on the Mechanical Properties and Corrosion Resistance of Dissimilar Friction Stir Welded Joints of AA2024-O and AA6061-O Aluminum Alloys

Soto-Diaz,

Sandoval-Amador,

Escorcia-Gutierrez

et al. 2024

Metals

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The influence of the process parameters, traverse, and rotational speeds of dissimilar friction stir welded joints of AA2024-O and AA6061-O aluminum alloys on the corrosion resistance was evaluated. Potentiodynamic tests using a 3.5% NaCl solution, open circuit potential, and polarization curves showed the corrosion behavior for the different welding parameters. These data were correlated with those obtained by mechanical tests (microhardness, tensile, and fracture analysis) and microstructure analysis by optical and scanning electron microscopy. It was observed that the combined effect of the parameters influenced the variation of corrosion resistance. This was evidenced mainly by the improvement of corrosion resistance at 1200 rpm–65 mm·min−1, which was related to the tendency of grain size and heat input presented. The corrosive attacks on the welded joints presented greater affectations in the presence of base material 1 (AA6061-O) with higher metallic dissolution. Corrosion attacks abovementioned were presented in different forms, such as pitting, localized, and selective, and they were observed by scanning electron microscopy. Finally, in corrosive and mechanical terms, the best performing condition was 1200 rpm and 65 mm·min−1 compared to the low parameter of 840 rpm and 45 mm·min−1.

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How microstructure affects localized corrosion resistance of stir zone of the AA2198-T8 alloy after friction stir welding

Cited by 13 publications

References 48 publications

TSA anodising voltage effects on the near-surface coarse intermetallic particles in the AA2024-T3 and AA2198-T8 alloys

TSA anodising voltage effects on the near-surface coarse intermetallic particles in the AA2024-T3 and AA2198-T8 alloys

Investigation of stress corrosion cracking of friction stir welded 2060 Al-Li alloy

Influence of Process Parameters on the Mechanical Properties and Corrosion Resistance of Dissimilar Friction Stir Welded Joints of AA2024-O and AA6061-O Aluminum Alloys

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