Method and apparatus for measuring corrosion current induced by

Details Method and apparatus for measuring corrosion current induced by Method and apparatus for measuring corrosion current induced by

1987-10-09

1988-12-06

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204403, 204404, 435 29, 435291, C12Q 102

Patent

active

047894342

ABSTRACT:
A corrosion measuring device is disclosed for measuring microbiologically duced 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-.mu.m porous cellulose acetate/cellulose 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.

REFERENCES:
patent: 3336161 (1967-08-01), Sutton et al.
patent: 3502559 (1970-03-01), Alexander

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