Relation between pitting potential, degree of sensitization, and reversed austenite in a supermartensitic stainless steel
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11
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2017
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Calderon-Hernandez J.W.
Hincapie-Ladino D.
Filho E.B.M.
Magnabosco R.
Alonso-Falleiros N.
Hincapie-Ladino D.
Filho E.B.M.
Magnabosco R.
Alonso-Falleiros N.
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Periódico
Corrosion
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CALDERÓN-HERNÁNDEZ, JOSÉ; HINCAPÍE-LADINO, DUBERNEY; BENEDITO MARTINS FILHO, EDSON; Magnabosco, Rodrigo; FALLEIROS, NEUSA. Relation between pitting potential, degree of sensitization and reversed austenite in a supermartensitic stainless steel. CORROSION, v. 73, p. 953-960, 2017.
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© 2017, NACE InternationalPitting potential (Ep) and degree of sensitization (DOS) of a supermartensitic stainless steel (SMSS) were determined on specimens heat-treated at different tempering temperatures (550°C, 575°C, 600°C, 625°C, 650°C, or 700°C). The effect of pH (pH 6 and pH 8) on the Ep obtained in a 3.5 wt% NaCl solution, as well as the correlation between Ep and DOS obtained in 0.5 M H2SO4 + 0.01 M KSCN solution, was studied. The results showed correlation between Ep and DOS values, the samples with the higher DOS values being the ones with the lower Ep. A mechanism was proposed that would explain the correlation of the presence of reversed austenite formed during tempering, Ep, and DOS.