Effect of sulfate on the pitting potential of austenitic stainless steels 18Cr8Ni and 17Cr6Mn5Ni in chloride media
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2019
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Calderon-Hernandez J.W.
Hincapie-Ladino D.
Magnabosco R.
Alonso-Falleiros N.
Hincapie-Ladino D.
Magnabosco R.
Alonso-Falleiros N.
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Revista Escola de Minas
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CALDERÓN-HERNÁNDEZ, JOSÉ WILMAR; HINCAPIE-LADINO, D.; MAGNABOSCO, R.; ALONSO-FALLEIROS, Neusa. Effect of sulfate on the pitting potential of austenitic stainless steels 18Cr8Ni and 17Cr6Mn5Ni in chloride media. REM - International Engineering Journal, v. 72, p. 97-103, 2019.
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© 2019, Escola de Minas. All rights reserved.Pitting corrosion resistance of two austenitic stainless steels, 18Cr8Ni (Type 304L or UNS S30403 stainless steel) and 17Cr6Mn5Ni, was evaluated in three electrolytic solutions containing a fixed concentration of 0.6M sodium chloride and different additions of sodium sulfate, 0.06M, 0.15M or 0.6M. Cyclic potentiodynamic polarization tests were performed on as-received samples and on specimens annealed at 1010°C, 1040°C, 1070°C or 1100°C. The best pitting corrosion resistance was presented by the 17Cr6Mn5Ni steel annealed at 1070°C or 1100°C, with lower delta ferrite contents, in the electrolyte with the highest sulfate concentration. It can be found that the addition of sodium sulfate inhibits pitting corrosion and has a better inhibitor effect in the high manganese steel.