Method for providing cathodic protection of underground structur

Details Method for providing cathodic protection of underground structur Method for providing cathodic protection of underground structur

1991-06-27

1992-12-29

Tung, T.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204148, 204196, 204197, 501154, C23F 1300

Patent

active

051748711

ABSTRACT:
A method and composition for providing cathodic protection to underground steel structures is disclosed in which a composition comprising calcium hydroxide, calcium silicate and calcium nitrite is added to backfill for raising the backfill pH above 8 and an electrical current is applied to polarize the surface of the steel structure whereby the surface of the steel structure is maintained negative relative to the backfill. Magnesium hydroxide and aluminum hydroxide can be used as a substitute for at least a portion of the calcium hydroxide.

REFERENCES:
patent: 2480087 (1949-08-01), Robinson et al.
patent: 3001919 (1961-09-01), Petrocokino
patent: 3861935 (1975-01-01), Ohnemuller et al.
patent: 4435264 (1984-03-01), Lau
patent: 4623435 (1986-11-01), Nebgen et al.

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