Heat transfer fluids and methods for preventing corrosion in heat transfer systems

Abstract

Heat transfer fluid concentrates include: a freezing point depressant, water, or a combination thereof; an organophosphate; a carboxylic acid or a salt thereof; and a component selected from the groupconsisting of an alkaline earth metal ion, an alkali metal ion, a transition metal ion, an inorganic phosphate, molybdate ion, nitrate ion, nitrite ion, an azole compound, a copper and copper alloy corrosion inhibitor, a silicate, a silicate stabilizer, a water-soluble polymer, and combinations thereof. Ready-to-use heat transfer fluids and methods for preventing corrosion in heat transfer systems are described.

Description

technical field [0001] The present invention relates generally to heat transfer fluids, and in some embodiments, to heat transfer fluids for inhibiting corrosion in heat transfer systems. [0002] background [0003] Modern vehicle engines often require heat transfer fluids (liquid coolants) to provide long-lasting, year-round protection to their cooling systems. The main requirement for heat transfer fluids is that they provide efficient heat transfer to control and maintain engine temperature for efficient fuel economy and lubrication, and to prevent engine failure due to freezing, boil over or overheating. Another key requirement of a heat transfer fluid is that it provide corrosion protection to all cooling system metals over a wide range of temperatures and operating conditions. Corrosion protection of aluminum for engine blocks, cylinder heads, water pumps, heat exchangers and other components made of aluminum or aluminum alloys is of particular importance. In additio...

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Problems solved by technology

This change in coolant can negatively affect its corrosion protection properties and affect its stability

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