2006
DOI: 10.1179/174327806x107905
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Corrosion of a dissimilar friction stir weld joining aluminium alloys AA2024 and AA7010

Abstract: The corrosion behaviour of a dissimilar metal friction stir weld between AA2024-T351 and AA7010-T7651 was investigated. Gel visualisation and immersion tests were used to examine the effect of galvanic coupling between the two components. A microelectrochemical cell with a 400 mm diameter glass tip was used to measure the anodic and cathodic reactivities at different positions in the weld region as well as in the base alloys. It was found that the net anodic attack was in the 7010 alloy with the highest suscep… Show more

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Cited by 25 publications
(33 citation statements)
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“…During the exposure, cathodic regions were observed mostly on AA2024 outside the nugget, but also inside the nugget and on the AA7050 base material. Thus, cathodic sites are not restricted to the AA2024, as reported for dissimilar butt welds [27]. It is worth noting that according to the SVET results (Fig.…”
Section: Scanning Vibrating Electrode Techniquesupporting
confidence: 61%
See 1 more Smart Citation
“…During the exposure, cathodic regions were observed mostly on AA2024 outside the nugget, but also inside the nugget and on the AA7050 base material. Thus, cathodic sites are not restricted to the AA2024, as reported for dissimilar butt welds [27]. It is worth noting that according to the SVET results (Fig.…”
Section: Scanning Vibrating Electrode Techniquesupporting
confidence: 61%
“…5f). According to the literature, for similar butt welds of the AA7050 alloy IC attack should be expected on the NZ close to the border with TMAZ [9,26], while for dissimilar butt welds between AA7010 and AA2024 alloys, IC was reported to occur on the Zn rich part of NZ, which consists of material arising from the AA7010 alloy [27]. It is important to observe that for the lap joint, studied here, the tool is introduced from the AA7050 alloy side during the FSW process and this alloy forms most of the nugget, while for dissimilar butt welds the nugget is formed by almost equal contributions of both alloys.…”
Section: Cyclic Voltammetrymentioning
confidence: 99%
“…the sensitisation of the microstructure, present on both sides of the recrystallised weld nugget, is caused by the temperature increase during friction stir welding . Consequently, the precipitate-free zone along the grain boundaries and the hardening precipitates are subjected to widening and coarsening (lumsden et al 1999;Jariyaboon et al 2006a;Hassan et al 2003b;Jata et al 2000;Rhodes et al 1997a). this causes an increased corrosion susceptibility.…”
Section: Corrosion Behaviour Of Friction Stir Welds In Aluminium Alloysmentioning
confidence: 99%
“…The temperature developed during the friction stir welding (FSW) of high strength 7-xxx series aluminum alloys promotes a coarsening of precipitates and a widening of the precipitate-free zones, in particular within the heat affected zones of the weld [1,2]. These latter weld zones appear to be the most corrosion susceptible regions [3,4].…”
Section: Troductiomentioning
confidence: 99%