CRITICAL POTENTIAL FOR GROWTH OF LOCALIZED CORROSION OF STAINLESS STEEL IN CHLORIDE MEDIA

A series of investigations were carried out to determine the critical potentials for the growth of localized corrosion on Type 316 and Type 316L stainless steel in chloride media using artificial specimens having the macroscopic local anode separated from the cathode. The critical potential value for the pitting in 0.5N NaCl solution at 70 C (158 F) was shown to be approximately minus 0.25 V to a saturated calomel electrode and that for the crevice corrosion was about minus 0.36 V SCE. The latter was nearly equal to the critical potential for the crack propagation of stress corrosion cracking (SCC) in boiling 35 percent MgCl 2 solution. These results indicate that the critical potential can vary, depending on the degree of occlusion on the anode. The critical potential seems to be determined mainly by the hydrogen ion concentrations inside the occluded anodes. The critical potential for pit growth was not affected by the environmental factors as the pitting potential.

  • Availability:
  • Corporate Authors:

    National Association of Corrosion Engineers

    2400 West Loop South
    Houston, TX  USA  77027
  • Authors:
    • Suzuki, T
    • KITAMURA, Y
  • Publication Date: 1972-1

Media Info

  • Features: Figures; References;
  • Pagination: p. 1-6
  • Serial:
    • CORROSION
    • Volume: 28
    • Issue Number: 1
    • Publisher: NACE International
    • ISSN: 0010-9312

Subject/Index Terms

Filing Info

  • Accession Number: 00028986
  • Record Type: Publication
  • Source Agency: United States Merchant Marine Academy
  • Files: TRIS
  • Created Date: Apr 21 1973 12:00AM