Corrosion inhibitors

Details Corrosion inhibitors Corrosion inhibitors

1991-10-24

1993-02-02

Stoll, Robert L.

Compositions

Preservative agents

Anti-corrosion

252393, 252394, 252395, 25238961, 25238962, 252180, 252 80, 562488, 562490, 562553, 562564, 562565, C23F 1114, C23F 1116

Patent

active

051835908

ABSTRACT:
A composition and method for inhibiting corrosion of ferrous metals in contact with an aqueous solution comprising adding to the system from 0.1 to 500 ppm of an aminohydroxysuccinic acid compound selected from group consisting of compounds of the generalized formulas: ##STR1## wherein R is H or C.sub.1 to C.sub.6 alkyl, optionally substituted with --OH, --CO.sub.2 H, --SO.sub.3 H or phenyl, C.sub.4 C.sub.7 cycloalkyl, or phenyl which is optionally substituted with --OH, or --CO.sub.2 H, and R' is H, C.sub.1 to C.sub.6 alkyl, optionally substituted with --OH or CO.sub.2 H; and ##STR2## wherein R' is as above, and Z is selected from the group consisting of i) --(CH.sub.2).sub.n -- wherein n is an integer from 2 to 10, ii) --(CH.sub.2).sub.2 --X--(CH.sub.2).sub.2 -- wherein X is --O--, --S--, --NR"--; wherein R" is selected from the group consisting of H, C.sub.1 to C.sub.6 alkyl, hydroxyalkyl, carboxyallkyl, acyl, --C(O)OR"' wherein R"' is C.sub.1 C.sub.6 alkyl or benzyl and ##STR3## wherein R' is as above, ##STR4## wherein Y is H, C.sub.1 to C.sub.6 alkyl, alkoxy, halogen, --CO.sub.2 H, or --SO.sub.3 H, m is independently 0 or 1 and p is 1 or 2, and ##STR5## wherein R.sub.a and R.sub.b are independently H or C.sub.1 to C.sub.6 alkyl, Q is H or C.sub.1 to C.sub.6 alkyl and S is 0, 1 or 2; t is independently 0, 1, 2 or 3 and q is 0, 1, 2, or 3, and r is 1 or 2; or water soluble salts thereof.

REFERENCES:
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patent: 4971724 (1990-11-01), Kalota et al.
Amino Acids As Corrosion Inhibitors in HCl Acid Solutions, Werkstofle and Korrosion 39, 512-517 (1988), Hackerman et al.
Chemical Abstracts 81 7748r (1974), Y. Matsuzawa et al.
Chem. Soc. Jap. 40, 2977, J. Oh-hashi et al.
Chemical Abstracts 57, 16732g (1962) Hamptman et al.

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