Control of corrosion in aqueous systems
AssigneeW. R. Grace & Co.-Conn.
InventorsDionisio G. Cuisia, Chih M. Hwa, Murrell L. Salutsky
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Abstract
A method and composition for inhibiting the corrosion of metal surfaces in contact with the system water of aqueous systems are disclosed, which use a combination of at least one compound selected from 2,5 dihydroxybenzene sulfonic acid and its water soluble salts and at least one amine selected from neutralizing amines and hydroxylamines.
Claims32
A method of inhibiting the corrosion of metal surfaces in contact with the system water of an aqueous system wherein oxygen is present in the system water, comprising adding to the system water as an oxygen scavenger
- (a) at least one compound selected from the group consisting of 2,5-dihydroxybenzene sulfonic acid and its water soluble salts;
- and
- (b) at least one hydroxylamine selected from the group consisting of diethylhydroxylamine and water soluble salts thereof;
- the 2,5-dihydroxybenzene sulfonic acid component and the hydroxylamine component being added to the system water in a weight ratio of hydroxylamine component to 2,5-dihydroxybenzene sulfonic acid component of between about 0.01:1 and 500:1, and in amounts effective for said components to interact to promote more rapid oxygen scavenging.
A method of inhibiting the corrosion of metal surfaces in contact with the system water of an aqueous system wherein oxygen is present in the system water, comprising adding to the system water as an oxygen scavenger
- (a) at least one compound selected from the group consisting of 2,5-dihydroxybenzene sulfonic acid and its water soluble salts;
- and
- (b) cyclohexylamine;
- the 2,5-dihydroxybenzene sulfonic acid component and the cyclohexylamine component being added to the system water in a weight ratio of cyclohexylamine component to 2,5-dihydroxybenzene sulfonic acid component of between about 0.1:1 and 100:1, and in amounts effective for said components to interact to promote more rapid oxygen scavenging.
The method of claim I5 wherein a neutralizing amine salt of 2,5-dihyroxy-benzene sulfonic acid is added.
A composition suitable for addition to an aqueous solution to inhibit the corrosion of metal surfaces in contact therewith by scavenging oxygen, comprising:
- (a) at least one compound selected from the group consisting of 2,5-dihydroxybenzene sulfonic acid and its water soluble salts;
- and
- (b)
- (i) cyclohexylamine, the weight ratio of the cyclohexylamine component to the 2,5-dihydroxybenzene sulfonic acid component being between about 0.1:1 and 100:1;
- or
- (ii) at least one hydroxylamine selected from the group consisting of diethylhydroxylamine and water soluble salts thereof, the weight ratio of the hydroxylamine component to the 2,5-dihydroxybenzene sulfonic acid component being between about 0.001:1 and 500:1;
- or
- (iii) both (i) and (ii).
Dependencies are inferred from the claim text.