Effect of temperature on resistance to pitting corrosion in duplex stainless steel 2205 welds

Keywords

duplex stainless steel, pitting corrosion, fusion welding, magnetic field.

Cite as

Martínez-Galván Y., Dzib-Pérez L., García-Rentería M., Bilyy O., López-Morelos V., and Gonzalez-Sanchez J. Effect of temperature on resistance to pitting corrosion in duplex stainless steel 2205 welds. Physicochemical Mechanics of Materials. 2022. 58(6), 063-069.

Abstract

Potentiodynamic polarization was applied to study the electrochemical behaviour of AISI 2205 duplex stainless steel welds and their resistance to pitting corrosion in natural seawater for different temperatures. The gas metal arc welding method (GMAW) was used to manu­facture joints with and without the simultaneous application of an external magnetic field of low intensity. The improvement of electrochemical behaviour and resistance to pitting corro­sion was evaluated as a function of the electrolyte temperature. The welded joints formed under an external magnetic field of 3 mT presented electrochemical behaviour similar to that for base metal samples, where as joints welded without a magnetic field (0 mT) showed the lowest resistance to pitting corrosion. The joints welded under the external magnetic field presented stable passive behaviour in natural seawater up to the temperature of 45°C, whereas the base metal up to 65°C. The samples welded without a magnetic field showed unstable passive behaviour at a temperature of 25°C. The improvement in the resistance to pitting corrosion of the welds with the application of a magnetic field occurred due to the intensi­fication of austenite phase regeneration during the thermal cycle and the limitation of ferrite phase grains growth. It also limits the precipitation of Cr-rich secondary phases with the consequent reduction of Cr-depleted zones, which ensures the formation of a stable and resistant passive film. The breakdown of this passive film, both in welds with and without a magnetic field, mainly occurs in the heat-affected zone.

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