Corrosion inhibiting method and inhibition compositions

Details Corrosion inhibiting method and inhibition compositions Corrosion inhibiting method and inhibition compositions

1991-11-06

1993-04-13

Stoll, Robert L.

Compositions

Preservative agents

Anti-corrosion

252392, 422 16, C23F 1110

Patent

active

052020584

ABSTRACT:
The present invention provides a method and compositions useful for inhibiting corrosion of a corrodible metal resulting from contact of water and air with the metal. In this method, a stannous salt and a hydrocarbyl substituted succinimide of a polyethylene polyamine are added to the water in minor amounts and cooperatively reduce corrosion of the metal to a substantially zero rate. While the amount of each agent for an effective inhibition is minor, say in the range of from about 0.1 to 100 ppm, a relatively concentrated solution is required for addition to the water. Suitable solvent media include the lower alkanols and mixture thereof with or without added water. Isopropanol is preferred. The solvent component of the compositions also varies depending upon the particular imide and/or salt component employed and the concentration desired. In general, the lower alkanol portion of the medium is in the range of from about 15 to 100 volume percent and the water portion is in the range of from about 0 to 85 volume percent. A medium in the range of from about 50 to 67 volume percent water is preferred. The relative amounts of the imide and stannous salt components desirably used varies depending upon the nature of the water in which the agents are employed. Satisfactory relative amounts by weight for each to the other at set forth above, are in the range of from about 0.5 to 10, preferably 0.8 to 2 and more preferably about 1 to 1 weight ratio.

REFERENCES:
patent: 3933662 (1976-01-01), Lowe
patent: 4866969 (1989-09-01), Shiba et al.
patent: 4913830 (1990-04-01), Lundberg

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