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US 4,971,724 AGranted
Process for corrosion inhibition of ferrous metals
AssigneeMonsanto Company
InventorsDennis J. Kalota, David C. Silverman
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Abstract
Processes employing compositions comprising certain amino acids such as aspartic acid, when fully ionized at alkaline pH, effectively inhibit corrosion of ferrous metals in the presence of an aqueous medium. This effect is enhanced with increased fluid velocity.
Claims18
A process for inhibiting corrosion of ferrous metals in the presence of an aqueous medium, which process comprises adding to the aqueous medium
- (a) an amino acid represented by the formula ##STR4## wherein R.sup.1 represents H, ##STR5## or H.sub.2 N--(--CH.sub.2 --).sub.y --;
- R.sup.2 represents HO--, ##STR6## or HOOC--(--CH.sub.2 --).sub.y --NH--;
- R.sup.3 represents H or --COOH;
- x and y each independently represents an integer from 1 to 3;
- and
- n represents an integer for the number of repeating aminoacyl units in an amount effective to inhibit corrosion of the ferrous metal, and
- (b) a base in an amount effective to provide the amino acid in a fully ionized form under use conditions.
4 more elements
Dependencies are inferred from the claim text.