Corrosion behavior of a superduplex stainless steel in chloride aqueous solution |
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Authors: | Manuele Dabalà Irene Calliari Alessandra Variola |
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Affiliation: | (1) Department of Mechanical and Management Innovation (DIMEG), Università di Padova, Via Marzolo 9, 3513 Padova, Italy |
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Abstract: | Super duplex stainless steels (SDSS) have been widely used as structural materials for chemical plants (especially in those
engaged in phosphoric acid production), in the hydrometallurgy industries, and as materials for offshore applications due
to their excellent corrosion resistance in chloride environments, compared with other commercial types of ferritic stainless
steels. These alloys also possess superior weldability and better mechanical properties than austenitic stainless steels.
However, due to their two-phase structure, the nature of which is very dependent on their composition and thermal history,
the behavior of SDSS regarding localized corrosion appears difficult to predict, especially in chloride environments. To improve
their final properties, the effect of the partition of the alloying elements between the two phases, and the composition and
microstructure of each phase are the key to understanding the localized corrosion phenomena of SDSS. This paper concerns the
effects of the SDSS microstructure and heat treatment on the SDSS corrosion resistance in aqueous solutions, containing different
amounts of NaCl at room temperature. |
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Keywords: | chlorides corrosion resistance heat treatments pitting secondary austenite super duplex stainless steels |
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