Abstract
In this work, it has been studied the pitting corrosion resistance of welding duplex stainless steel 2205. Unions were made by GMAW process with different fillers: duplex ER 2209 and two austenitic (ER 316LSi and ER 308LSi). The microstructure obtained with the duplex ER 2209 filler is similar to the duplex 2205 base material, but the unions produced with the austenitic fillers cause a decrease of the phases relation a/g. To evaluate the influence of the filler on the weld, the pitting corrosion resistance was determined by electrochemical critical pitting temperature test (TCP) and the mechanical properties by the hardness. The phases imbalance produced for the dissimilar fillers bring out a variation of the pitting corrosion resistance and the mechanical properties.
Highlights
In this work, it has been studied the pitting corrosion resistance of welding duplex stainless steel 2205
Unions were made by GMAW process with different fillers
The microstructure obtained with the duplex ER 2209 filler is similar to the duplex
Summary
El creciente interés por parte de diferentes sectores industriales como por ejemplo el petroquímico o el de generación de energía, por los aceros inoxidables dúplex se debe a las mejores propiedades mecánicas y de resistencia a la corrosión que presentan frente a otros aceros inoxidables y aceros estructurales. Estas propiedades pueden verse afectadas por los procesos de soldadura, ya que pueden alterar la proporción de fases durante o posteriormente al soldeo [4]. Los aceros inoxidables dúplex presentan un excelente comportamiento frente a la corrosión localizada por picadura, gracias al elevado porcentaje de molibdeno en su composición, lo que les otorga un PREN entre 30-50 [5,6,7]. Escuela Superior de Ciencias Experimentales y Tecnología. En este estudio se trata de evaluar la microestructura y su influencia en la variación de la resistencia a la corrosión por picadura de uniones de aceros inoxidables dúplex con diferentes aportes. Además, proporcionar información sobre uniones disimilares entre aceros inoxidables dúplex y austeníticos y relacionar la microestructura obtenida con algunas propiedades de la soldadura formada
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