Abstract
The corrosion behavior at different positions (top and bottom) of the weld nugget zone along the thickness plates in AA6061-T6 aluminum alloys welded by friction stir lap welding, under the conditions of 1000 rpm-60 mm/min and 900 rpm-40 mm/min in a 3.5 wt% NaCl solution, was investigated by Tafel polarization at ambient temperature. The morphology of the nugget zone corroded surfaces was analyzed by scanning electron microscopy together with energy dispersive spectroscopy (SEM-EDS) as well as atomic force microscopy (AFM). It was found that the top half of the nugget zone has a better corrosion resistance than that of the bottom half for both welding conditions. A localized pit dissolution with combined intergranular corrosion are the dominant corrosion types across different positions of the nugget zone for various welding conditions and in the parent alloy.
Highlights
Aluminum alloys are used for diverse applications, including in the automobile and aerospace industries
A single friction-stir lap welding (FSLW) pass was performed along the longitudinal centerline of the overlap
For friction stir welding (FSW) under different values of ω and ʋ, the temperature and material flow patterns have been studied by numerous researchers
Summary
Aluminum alloys are used for diverse applications, including in the automobile and aerospace industries. The selection of their composition is dictated by their welding behavior as well as applicable welding processes. The AA6xxx wrought alloys have become significant due to their versatile application for armor structures, rockets, missile casings, lightweight defense vehicles, cars and marine structures because of their high strength to weight ratio, plasticity, formability and fairly good corrosion resistance. The primary alloying elements, including Mg, Si, Cu, Fe and Mn, play an important role in AA6xxx alloy properties. The elements Mn and Cr increase the alloy strength (10-15%). Due to the good corrosion resistance of AA6xxx, these alloys become susceptible to intergranular corrosion and stress corrosion cracking when the content of Cu and Si are increased. The addition of Fe without a Fe corrector increases the pitting corrosion tendency[1]
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