Corrosion protection of steel in ammonia/water heat pumps
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United States of America Patent
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Oct 14, 2003
Grant Date -
Apr 18, 2002
app pub date -
Jan 31, 2001
filing date -
Oct 19, 1999
priority date (Note) -
Expired
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Abstract
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.
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