Backfill for magnesium anodes

Details Backfill for magnesium anodes Backfill for magnesium anodes

1983-09-01

1985-04-16

Tung, T.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204197, 106DIG4, C23F 1300

Patent

active

045114447

ABSTRACT:
A backfill composition for use with sacrificial magnesium anodes used in the cathodic protection of ferrous metal structures comprises an anion-releasing material capable of releasing fluoride, phosphate or silicate ions in water-soluble form and a magnesium-transporting adjuvant capable of transporting magnesium ion by ion exchange conduction. Suitable anion-releasing materials include calcium fluoride, cryolite, magnesium silicate and sodium silicofluoride, while suitable magnesium transporting adjuvants include bentonite clay, calcium sulfate, calcium carbonate, calcium hydroxide and magnesium silicate. A particularly preferred composition comprises, on a dry basis, by weight, 76.7% calcium hydroxide, 2.3% calcium sulfate, 20% bentonite clay and 1% calcium fluoride.

REFERENCES:
patent: 2480087 (1949-08-01), Robinson et al.
patent: 2495466 (1950-01-01), Miller
patent: 2527361 (1950-10-01), Hunter
patent: 2567855 (1951-09-01), Pippin et al.

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