Characterisation and understanding of the corrosion behaviour of the nugget in a 2050 aluminium alloy Friction Stir Welding joint

Proton, Vincent; Alexis, Joël; Andrieu, Éric; Delfosse, Jérôme; Lafont, Marie‐Christine; Blanc, Christine

doi:10.1016/j.corsci.2013.04.001

Cited by 111 publications

(59 citation statements)

References 32 publications

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“…For this material, fracture takes place on the region lying between NZ and TMAZ, both in air and in 3.5 wt.% NaCl solution. Proton et al [13] verified the influence of post-weld heat treatments on the electrochemical behaviour of the nugget AA2050 alloy. The gel visualisation test showed that after the heat treatment the nugget change its behaviour from anodic to cathodic.…”

Section: Introductionmentioning

confidence: 97%

Corrosion study of the friction stir lap joint of AA7050-T76511 on AA2024-T3 using the scanning vibrating electrode technique

2015

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Section: Introductionmentioning

confidence: 97%

Corrosion study of the friction stir lap joint of AA7050-T76511 on AA2024-T3 using the scanning vibrating electrode technique

2015

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“…It can be reasoned that, in FSW, small grains formed in the weld regions increase the grain boundaries, which are thermodynamically susceptible to corrosion, and cause poorer corrosion behavior than the parent alloy 27,28 . The susceptibility to corrosion observed from the finer grained alloys could be related to an increased grain boundary density that will likely enhance the overall surface reactivity 29 . The corrosion potential of the secondary phase is not the same as the parent alloy phases.…”

Section: Electrochemical Behaviormentioning

confidence: 99%

Corrosion behavior of friction stir welded lap joints of AA6061-T6 aluminum alloy

Gharavi

Матори

Yunus³

et al. 2014

Mat. Res.

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In this work, the corrosion behaviors of friction-stir lap welding of 6061-T6 Al-alloy are studied. The friction-stir lap welding was performed under different welding conditions (rotation speed and welding speed). The corrosion behavior of the parent alloy, the weld nugget zone (WNZ), and the heat affected zone (HAZ) of each welded sample working as an electrode, were investigated by the Tafel polarization test in 3.5 wt. (%) NaCl at ambient temperature. The morphology of the corroded surface of each region was analyzed by scanning electron microscopy together with energy dispersive spectroscopy (SEM-EDS). The results showed that the corrosion resistance of the parent alloy was better than the WNZ and the HAZ in both welding conditions. Localized pit dissolution and intergranular corrosion were the dominant corrosion types observed in the parent alloy, WNZ, and HAZ. The parent alloy, WNZ, and HAZ exhibited similar corrosion potentials (E corr ) after T6 heat treatment. This treatment had a better effect on the corrosion resistance of the welded regions than the parent alloy.

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“…Copper and manganese did not show any major activity. Proton et al [8] investigated the corrosion behaviour of the nugget of a Friction Stir Welding joint employing a 2050 Al-Cu-Li alloy. The results showed that the nugget was susceptible to both intergranular and pitting corrosion.…”

confidence: 99%

Comparison of Mechanical & Corrosion behavior of Aluminum Alloys Weldments

Hans¹

2018

IJRASET

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In the ship manufacturing industries, welding is used to join the different aluminum parts of the ship structure, these weldments are generally remaining dip in saline water of sea or remain in salt foggy atmosphere, which gets eroded early when comes in contact with salt-water solution. In the proposed research work, after joining 5086-H116 aluminum alloy by friction stir welding, and TIG welding, the mechanical examination and comparison was done. The main objective of the present research work was to compare corrosion behaviour of FSW and TIG weldments of AA5086-H116 using ASTM G66 and ASTM G67 corrosion test standards. Keywords: AA5086-H116; Corrosion behavior; ASTM G66; ASTM G67. I.INTRODUCTION Metallic corrosion takes place in wet environments when the chemical or electrochemical reaction between a metal and the surrounding environment results in the oxidation of the metal. For corrosion to occur, electrons are produced by the anodic oxidation of the metal must be consumed in a cathodic reaction. These two processes can take place on different parts of a metal structure providing that there is a conducting path for the electrons between the two, and a continuous electrolyte path for ion transport. Aluminum is highly reactive, with a negative standard electrode potential of -1660mV, and is therefore unstable in the presence of water. However, aluminum reacts quickly with the oxygen in air or water to form a protective oxide film (alumina, Al O ) that is stable in pH range 4-9 and prevents corrosion of the metal. There are three main types of localized corrosion that affect aluminum in aqueous environments: pitting corrosion, intergranular corrosion, exfoliation corrosion, whereby the mode of corrosion that takes place depends strongly on the alloy, its processing history and its environmental conditions. Aluminum alloys of 5xxx series and their welded joints show good resistance to corrosion in sea water. 5086-H116 is one of such an excellent marine environment corrosion resistant aluminum alloy, most commonly used in North America [1]. It is a marine grade alloy used for its excellent corrosion resistant properties. In the ship manufacturing industries, TIG welding is used to join the different aluminum parts of the ship structure, these weldments are generally remaining dip in saline water of sea or remain in salt foggy atmosphere, which gets eroded early when comes in contact with salt-water solution due to the HAZ area of TIG weldments which is generally large and causes initiation of localized corrosion easily [2]. The problem can be solved if the welding process is changed to friction stir welding that produces comparatively very less HAZ area, and also if we compare the cost of welding process, it was observed that the cost of friction stir welding is 15-20 times less than the cost of TIG welding [3]. Squillace et al.,[4] compared two different welding processes one is conventional tungsten inert gas (TIG) process and second is friction stir welding (FSW). A micro-hardness measurement allow...

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Characterisation and understanding of the corrosion behaviour of the nugget in a 2050 aluminium alloy Friction Stir Welding joint

Cited by 111 publications

References 32 publications

Corrosion study of the friction stir lap joint of AA7050-T76511 on AA2024-T3 using the scanning vibrating electrode technique

Corrosion study of the friction stir lap joint of AA7050-T76511 on AA2024-T3 using the scanning vibrating electrode technique

Corrosion behavior of friction stir welded lap joints of AA6061-T6 aluminum alloy

Comparison of Mechanical & Corrosion behavior of Aluminum Alloys Weldments

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