TIME DEPENDENCE OF CATHODIC PROPERTIES OF MATERIALS IN SEAWATER

It is described how the cathodic efficiency of stainless steels, titanium, platinum and 90/10 Cu-Ni increases during their initial weeks of exposure to natural seawater owing to the catalytic action of a microbial slime layer that forms. This increase is studied for stainless steel under conditions involving various polarization potentials, temperatures and flow rates. The increased cathodic efficiency shifts the free corrosion potential, favoring the initiation and spread of crevice corrosion. The microbial effect on cathodic efficiency and the appearance of crevice corrosion does not exist at temperatures above 30 to 40 deg. C and the maximum crevice corrosion liability of stainless steels is expected to be about 30 deg. C.

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  • Supplemental Notes:
    • Journal article
  • Authors:
    • Holthe, R
    • Bardal, E
    • Gartland, P O
  • Publication Date: 1989-6

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Filing Info

  • Accession Number: 00657941
  • Record Type: Publication
  • Source Agency: Maritime Technical Information Facility
  • Files: TRIS
  • Created Date: Jul 21 1994 12:00AM