Corrosion inhibiting heat transfer liquid

Claim 2

A liquid composition comprising ethylene glycol or propylene glycol and an amount, sufficient to inhibit corrosion of a metal in contact with said composition, of fluoroaliphaticsulfonamidophosphonic acid or the salt thereof.

Claim 3

A liquid composition comprising ethylene glycol or propylene glycol and an amount, sufficient to inhibit corrosion of a metal in contact with said composition, of fluoroaliphatic compound of the formula: ##STR8## in which R f is a fluoroaliphatic radical, Q is a linkage through which R f and the phosphorus atom, P, are covalently bonded together, the skeletal chain of such linkage being free of moieties which are more readily hydrolyzable than an amido moiety, and M 1 and M 2 are indepdendently hydrogen or salt-forming cations.

Claim 4

A liquid composition comprising ethylene glycol or propylene glycol and an amount, sufficient to inhibit corrosion of a metal in contact with said composition, of fluoroaliphatic compound of the formula: ##STR8## in which R f is a fluoroaliphatic radical, Q is a linkage through which R f and the phosphorus atom, P, are covalently bonded together, the skeletal chain of such linkage being free of moieties which are more readily hydrolyzable than an amido moiety, and M 1 and M 2 are indepdendently hydrogen or salt-forming cations.

Claim 5

A liquid composition comprising an aqueous solution of ethylene glycol and an amount, sufficient to inhibit corrosion of a metal in contact with said composition, of fluoroaliphatic compound having the general formula: ##STR9## in which R f is a monovalent fluoroaliphatic radical, R 1 is hydrogen or an alkyl group having 1 to 8 carbon atoms, R 2 is an alkylene group with 1 to 16 carbon atoms or R 1 together with R 2 and the sulfonamido nitrogen form an azacyclic ring, and M 1 and M 2 are independently hydrogen or salt-forming cations.

Claim 6

A liquid composition comprising an aqueous solution of ethylene glycol and an amount, sufficient to inhibit corrosion of a metal in contact with said composition, of fluoroaliphatic compound having the general formula: ##STR9## in which R f is a monovalent fluoroaliphatic radical, R 1 is hydrogen or an alkyl group having 1 to 8 carbon atoms, R 2 is an alkylene group with 1 to 16 carbon atoms or R 1 together with R 2 and the sulfonamido nitrogen form an azacyclic ring, and M 1 and M 2 are independently hydrogen or salt-forming cations.

Claim 7

A liquid composition comprising an aqueous solution of ethylene glycol and fluoroaliphatic compound in the amount of 5×10 -5 to 1 weight percent, said compound having the general formula: ##STR10## in which R f is a monovalent fluoroaliphatic radical having 1 to 18 carbon atoms and a terminal --CF 3 group, R 1 is an alkyl group having 1 to 6 carbon atoms, R 2 is an alkylene group with 3 to 11 carbon atoms, or R 2 is an alkanetriyl group bonded to R 1 and the sulfonamido nitrogen atom to form an azacylic group which has 4 or 5 ring carbon atoms and 0 to 6 exocyclic carbon atoms, and M 1 and M 2 are independently hydrogen or salt-forming cations selected from the group consisting of Group I or Group II metal cations, ammonium, or an aliphatic primary, secondary, tertiary, or quaternary ammonium cation.

Claim 8

A liquid composition comprising an aqueous solution of ethylene glycol and fluoroaliphatic compound in the amount of 5×10 -5 to 1 weight percent, said compound having the general formula: ##STR10## in which R f is a monovalent fluoroaliphatic radical having 1 to 18 carbon atoms and a terminal --CF 3 group, R 1 is an alkyl group having 1 to 6 carbon atoms, R 2 is an alkylene group with 3 to 11 carbon atoms, or R 2 is an alkanetriyl group bonded to R 1 and the sulfonamido nitrogen atom to form an azacylic group which has 4 or 5 ring carbon atoms and 0 to 6 exocyclic carbon atoms, and M 1 and M 2 are independently hydrogen or salt-forming cations selected from the group consisting of Group I or Group II metal cations, ammonium, or an aliphatic primary, secondary, tertiary, or quaternary ammonium cation.

Claim 9

The composition according to claim 4 wherein said fluoroaliphatic compound is selected from the group consisting of 3-(N-butyltrifluoromethanesulfonamido)propanephosphonic acid, 3-(N-ethyltrifluoromethanesulfonamido)propanephosphonic acid, 3-(N-ethylperfluorobutanesulfonamido)propanephosphonic acid, 4-(N-methylperfluorooctanesulfonamido)butanephosphonic acid, 3-(N-butylperfluorooctanesulfonamido)propanephosphonic acid, (N-perfluorooctanesulfonyl-4-methyl)pyrroliden-3-ylmethanephosphonic acid, 11-(N-ethylperfluorooctanesulfonamido)undecanephosphonic acid and the salts thereof.

Claim 10

The composition according to claim 4 wherein said fluoroaliphatic compound is C 8 F 17 SO 2 N(C 2 H 5 )(CH 2 ) 3 P(O)(OH) 2 .