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Corrosion protection of steel in ammonia/water heat pumps

United States Patent

October 14, 2003
View the Complete Patent at the US Patent & Trademark Office
Corrosion of steel surfaces in a heat pump is inhibited by adding a rare earth metal salt to the heat pump's ammonia/water working fluid. In preferred embodiments, the rare earth metal salt includes cerium, and the steel surfaces are cerated to enhance the corrosion-inhibiting effects.
Mansfeld; Florian B. (Marina del Rey, CA), Sun; Zhaoli (Los Angeles, CA)
Advanced Mechanical Technology, Inc. (Watertown, MA)
09/ 774,540
January 31, 2001
GOVERNMENT SUPPORT The invention was supported, in whole or in part, by a grant, Contract No. DE-FG02-98-ER82519, from the Department of Energy. The Government has certain rights in the invention.