PITTING CORROSION OF SENSITIZED FERRITIC STAINLESS STEEL

The mechanism of pitting corrosion resistance of sensitized ferritic stainless steel was investigated in alloys containing 26 per cent Cr, 0.007-0.013 per cent C, 0.020-0.024 per cent N, and 0.10 to 2.56 per cent Mo by sensitizing at 621 C (1150 F) for increasing times. Pitting corrosion rate in ferric chloride and potentiostatic breakdown potential passed through a maximum with time at 621 C, suggesting that the Cr depletion theory, widely accepted for intergranular corrosion resistance, also applies in the case of pitting corrosion in ferritic stainless steel. The more rapid diffusion rate of Cr in ferritic stainless steel, as contrasted with austenitic material, increases rate of sensitization, but annealed properties can be regained in a few hours by isothermally holding at the sensitizing temperature.

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  • Corporate Authors:

    National Association of Corrosion Engineers

    2400 West Loop South
    Houston, TX  USA  77027
  • Authors:
    • Rarey, C R
    • Aronson, A H
  • Publication Date: 1972-7

Media Info

  • Pagination: p. 255-258
  • Serial:
    • CORROSION
    • Volume: 28N7
    • Publisher: NACE International
    • ISSN: 0010-9312

Subject/Index Terms

Filing Info

  • Accession Number: 00035217
  • Record Type: Publication
  • Source Agency: United States Merchant Marine Academy
  • Files: TRIS
  • Created Date: Oct 27 1973 12:00AM