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US 6,156,129 AGranted
Liquid metal cleaner for aqueous system
AssigneeAshland Inc.
InventorsLinda M. Hlivka, Joseph Mihelic, Bruce L. Libutti
Life of this patent
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Abstract
The invention relates to a composition useful for cleaning metal surfaces immersed in an aqueous system. The composition comprises as a mixture: an organic carboxylic acid; a non chelating amine; a chelating agent; and preferably a sulfur-containing polymer.
Claims9
A process for removing corrosive deposits from a metal surface exposed to an aqueous system where said process comprises:
- contacting an effective amount of a metal cleaner to a metal surface exposed to an aqueous system where the pH of said metal cleaner is 50 to 75 and said metal cleaner comprises:
- (a) from about 1 to about 40 parts by weight of citric acid;
- (b) from about 15 to about 25 parts by weight of an alkanolamine;
- (c) from about 1 to about 20 parts by weight of EDTA, alkali metal salts thereof, and ammonium salts thereof, and
- (d) water,
- where said parts by weight are based upon 100 parts of metal cleaner, and whereby corrosive deposits are removed from said metal surface.
3 more elements
Dependencies are inferred from the claim text.