Effect of Precipitation of Alpha Line and Sigma Phases on the Microstructure and Corrosion Resistance of the Duplex Stainless Steel SAF 2205

The purpose of this work was to evaluate the microstructural alterations associated aging thermal treatments performed at 450, 475, 800 and 850°C, for 1, 3 12h, besides evaluating influence precipitation alpha line phase on corrosion resistance. samples were characterized by scanning electron microscopy, energy dispersion spectrometry, X-ray diffraction, feritscope, hardness, microhardness, in addition cyclic potentiodynamic polarization double loop electrochemical potentiokinetic reactivation. In agings 450°C 1h 475°C there inside ferrite no significant effect resistance pitting phenomenon sensitization not promoted. 850°C sigma formed from consumption ferrite, chi phase, promoting increase steel hardness. 12 h decrease moderated promoted 800°C, with just phases precipitation.