Estudio comparativo de la resistencia a la corrosión en juntas soldadas por fricción-agitación y por el proceso GMAW de aluminio AA1100

Abstract

In this study was evaluated the corrosion behavior of welded joints obtained by electric arc and friction stir welding in AA1100 aluminum alloy with the aim to compare the effects of the process on the corrosion resistance. Tests were performed on salt spray chamber andpotentiodynamic polarization test on welded joints based on ASTM B117 and ASTM G5 standards, respectively, using NaCl. The corrosion rate, mass loss behavior and potentiodynamic curves were analyzed. The analyzes were complemented by observation of tested surfaces with stereology and scanning electron microscopy. The results showed that localized corrosion was observed in both processes, which was stronger in the fusion region of welding arc processed samples. Furthermore, this last kind of samples showed higher mass loss and higher corrosion rate than the solid state processed samples.