Metal corrosion inhibition in closed cooling systems
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United States of America Patent
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Mar 1, 1988
Grant Date -
N/A
app pub date -
Jan 17, 1986
filing date -
Jan 17, 1986
priority date (Note) -
Expired
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Abstract
The corrosion of metals in closed, aqueous cooling systems having a pH of 7.5 to 10.5 is inhibited by adding to the system a coolant concentrate comprising water, at least 10% by weight of a water soluble nitrite or a mixture of a water soluble nitrite and a water soluble nitrate, 0.2 to 2.0% by weight of at least one water soluble azole, and 0.1 to 1.0% by weight of a water soluble molybdate, to provide in the system concentrations of at least 200 ppm of the nitrite or nitrite/nitrate mixture, 2 to 20 ppm of the azole and 1 to 10 ppm of the molybdate.
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