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semi-quantitative-analysis
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Corrosion behavior of aluminum 6061 alloy joined by friction stir welding and gas tungsten arc welding methods
, Article Materials and Design ; Volume 39 , 2012 , Pages 329-333 ; 02641275 (ISSN) ; Sadrnezhaad, S. K ; Karimzadeh, F ; Sharif University of Technology
Abstract
Wrought aluminum sheets with thickness of 13. mm were square butt-welded by friction stir welding (FSW) and gas tungsten arc welding (GTAW) methods. Corrosion behavior of the welding zone was probed by Tafel polarization curve. Optical metallography (OM) and scanning electron microscopy together with energy dispersive spectroscopy (SEM-EDS) were used to determine morphology and semi-quantitative analysis of the welded zone. FSW resulted in equiaxed grains of about 1-2 μm, while GTAW caused dendritic structure of the welded region. Resistance to corrosion was greater for the FSW grains than the GTAW structure. In both cases, susceptibility to corrosion attack was greater in the welded region...