Corrosion inhibited aqueous compositions containing tertiary, bi

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

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252 73, 252 77, 252150, 252148, 252146, 252156, 252390, 252394, 252158, 106 1415, 106 1416, 106 1442, 422 12, 422 17, C11D 732, C09K 500

Patent

active

042921902

ABSTRACT:
Tertiary, cyclic, bridgehead amines are disclosed as useful corrosion inhibitors for metals in contact with aqueous alkaline liquids. The disclosed amines have been found to be strongly resistant to thermal decomposition, to chemical attack, and to nitrosation. The use of these corrosion inhibitors is particularly desirable in aqueous alcohol compositions useful as a heat exchange liquid in the cooling systems of an internal combustion engine wherein said aqueous solutions are ethylene glycol-based compositions. The disclosed amines are useful under alkaline conditions alone or in combination with conventional corrosion inhibitors such as water-soluble metal salts of tolyltriazole and phosphoric acid, alkali metal nitrites and nitrates, and alkali metal phosphates.

REFERENCES:
patent: 2939881 (1960-06-01), Orchin
patent: 3981780 (1976-09-01), Scherrer et al.

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