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REM - International Engineering Journal

versão On-line ISSN 2448-167X

Resumo

CALDERON-HERNANDEZ, José Wilmar; HINCAPIE-LADINO, Duberney; MAGNABOSCO, Rodrigo  e  ALONSO-FALLEIROS, Neusa. Effect of sulfate on the pitting potential of austenitic stainless steels 18Cr8Ni and 17Cr6Mn5Ni in chloride media. REM, Int. Eng. J. [online]. 2019, vol.72, n.1, pp.97-103. ISSN 2448-167X.  http://dx.doi.org/10.1590/0370-44672017720018.

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.

Palavras-chave : pitting potential; sodium chloride; stainless steel; manganese; corrosion inhibitor.

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