Coolant having rapid metal passivation properties
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United States of America Patent
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Aug 25, 2015
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app pub date -
Sep 5, 2012
filing date -
Sep 5, 2012
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Abstract
It has been found that the chemical reactivity of the metal surface of heat exchangers with coolants in presence of nitrites can be reduced by the addition of additives such as phosphonates or phosphinates. Aluminum, other Group III metals, as well as other metals commonly used in cooling systems, such as those of automobile engines, may thus be effectively protected.
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