Patent ID: 6156129
Filing Date: 2000-12-05
Classification: C11D,C23G

Abstract:
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.