Corrosion-inhibiting automotive coolant solutions containing eff

Details Corrosion-inhibiting automotive coolant solutions containing eff Corrosion-inhibiting automotive coolant solutions containing eff

1991-04-12

1993-11-16

Skane, Christine

Compositions

Heat-exchange, low-freezing or pour point, or high boiling...

252 75, 2523893, 422 14, 422 18, C09K 500, F28F 2300

Patent

active

052620786

ABSTRACT:
Non-corrosive anti-freeze solutions for automotive cooling systems include an anti-corrosive effective amount of a sodium silicate corrosion inhibitor, and sodium nitrate. The sodium silicate has an unusually low ratio of silica to sodium oxide of greater than 1.0 to about 2.4. This relatively low ratio of silica to sodium oxide prevents gelation from occurring while the synergistic combination of the sodium silicate and sodium nitrate maintains maximum anti-corrosive effectiveness of alcohol-based solutions containing the same.

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