Chemistry: electrical and wave energy – Processes and products
Patent
1978-09-29
1982-09-28
Weisstuch, Aaron
Chemistry: electrical and wave energy
Processes and products
204147, 204195C, 204196, G01N 2746, C23F 1300
Patent
active
043517030
ABSTRACT:
Cathodic protection monitoring of large metallic structures receiving cathodic current from a remote anodic electrode. Exposed to the cathodic current, closely adjacent the metallic structure, is a metallic specimen with a surface area of less than one-tenth of the structure's area. Current flow is induced between the specimen and the structure until their potential difference is substantially zero. Measurement of the induced current flow allows the current density impressed upon the specimen to be determined, and it is substantially identical to the current density impressed upon the structure by the cathodic current. Anodic and cathodic induced current flows are employed for varying the potential of the specimen relative to the structure (as reference) to determine anodic and cathodic reaction rates, unprotected corrosion rate of the structure, and the cathodic current required to protect the structure. The metallic specimen may be partially encased in an insulating covering.
REFERENCES:
patent: 2943027 (1960-06-01), Schaschl et al.
patent: 3486996 (1969-12-01), Annand
patent: 3634222 (1972-01-01), Stephens, Jr.
patent: 3649492 (1972-03-01), Marsh et al.
patent: 3748247 (1973-07-01), Weisstuch
patent: 3948744 (1976-04-01), Cushing
Glass Hyman F.
Petrolite Corporation
Ring Sidney B.
Weisstuch Aaron
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