Chemistry: electrical and wave energy – Processes and products – Vacuum arc discharge coating
Patent
1975-10-06
1977-09-27
Tung, T.
Chemistry: electrical and wave energy
Processes and products
Vacuum arc discharge coating
204148, C23F 1300
Patent
active
040510077
ABSTRACT:
Sacrificial anodes for cathodic protection systems wherein inner portions of a tank, at least partly filled with a liquid, are exposed to a corrosive inner environment and are protected against the corrosion by the provision of a consumable sacrificial anode, the material of which gradually migrates through the liquid to and is deposited on the inner tank portions, without an external voltage being applied, and wherein the inner tank environment also promotes detrition of the sacrificial anode. The invention with the anode with an inner metal tube, provides openings in the tube wall, preferably by perforation, so that the anode material normally constitutes a barrier between the tube interior and the tank environment, and obtains an indication of progressed detrition or consumption of the anode, at which point the consumable anode should be replaced for continued effective cathodic protection. A pressure difference is usually effected between the tank environment and the tube interior, either by pressurizing the tank, or by providing a source of pressure or vacuum in the system. A small slidable plunger is provided that gives visual, color-coded information on the progressed detrition or consumption of the anode material inside the tank.
REFERENCES:
patent: 2157180 (1939-05-01), Little
patent: 2517382 (1950-08-01), Brinker et al.
patent: 2710833 (1955-06-01), Craver
patent: 2726205 (1955-12-01), Marshall et al.
patent: 3423305 (1969-01-01), Tausk
patent: 3513082 (1970-05-01), Beer et al.
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