Coolant inhibitor concentrate

Compositions – Heat-exchange – low-freezing or pour point – or high boiling... – Organic components

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106 1417, 106 1442, 106 1444, 252 74, 252390, C09K 500, C23F 1100

Patent

active

056434936

ABSTRACT:
The invention described herein is a corrosion inhibitor concentrate, and a method for preparation thereof, which may be formulated free of nitrites, nitrates, amines, and phosphates. The inhibitor concentrate is a "single part" synergistic combination of inhibitors, stabilizers, and antifoam agents, useful for reinhibition of recycled antifreeze/coolant. The inhibitor concentrate is efficacious for corrosion inhibition in coolants across a broad range of glycol quality. The inhibitor concentrate comprises specific amounts of water, triazole, alkali metal hydroxide, borate, alkali metal silicate, silicate stabilizer, and anti-foaming agent.

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Sotoudeh, "An Amine, Nitrite, Phosphate and Heavy Metal Free Engine Coolant Inhibitor" SAE Technical Paper Series, 930474 (Mar. 1993).
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