Accession Number:

ADD013928

Title:

Method and Apparatus for Measuring Corrosion Current Induced by Microbiological Activities.

Descriptive Note:

Patent, Filed 6 Dec 88,

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Report Date:

1988-12-06

Pagination or Media Count:

8.0

Abstract:

A corrosion measuring device is disclosed for measuring microbiologically induced corrosion using galvanically coupled electrodes exposed in an electrolytically continuous, biologically separated environment. The device consists of two mirror image, half-cells separated by either a 0.1- micrometer porous cellulose acetatecellulose nitrate membrane or a solid disc. The membrane is used when measuring total corrosion current in a chemically continuous environment while the solid disc is used when evaluating individual corrosion mechanisms in chemically isolated environment. Culture medium is pumped through inlets of the half-cells at a constant speed. One of the electrodes is inoculated with viable microorganisms which colonize the electrode surface creating a corrosion current that can be measured with a zero resistance ammeter. If a solid Teflon disc is used, an agar salt bridge is inserted through the utility port of each half-cell to maintain electrolytic continuity. In such a chemically separated environment, the biologically controlled mechanisms for corrosion can be evaluated, including, but not limited to differential aeration, acid production, or entrapment of metallic cations. Keywords Patents, Fouling organisms, Galvanic corrosion. aw

Subject Categories:

  • Electrical and Electronic Equipment
  • Properties of Metals and Alloys
  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE