Heat Transfer System with Organic, Non-Ionic Inhibitors Compatible with Flux Exposure in Fuel Cell Operations
AssigneeCCI North America Corporation
InventorsTimo WEIDE, Aleksei GERSHUN
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Abstract
An aqueous coolant composition particularly useful for batteries and fuel cell contains an aliphatic alcohol having unsaturated bonds and/or a sulfur bond in the molecules thereof or a stabilized non-ionic silicate. The composition may also contain five-membered heterocyclic compounds, azole derivatives. The coolant composition possesses both low electrical conductivity and good antifreeze properties.
Claims7
A silicate-containing heat transfer fluid providing corrosion protection to metal surfaces of the type containing water, alkylene glycols, silicates and azole derivatives having a conductivity of not more than 50 μS/cm characterized in that the non-ionic additives of said heat transfer fluid are selected from 0.05 to 15% by weight in total of at least one of the following components:
- an ethoxylated and/or propoxylated prop-2-yn-1-ol or 2-butyne-1,4-diol derivative with an average alkoxylation ratio of 1-5;
- an ethoxylated and/or propoxylated thiodiglycol derivative with an average molecular weight from 500-1000 M;
- and
- a stabilized non-ionic silicate component prepared with an organic silane which component does not cause silicate precipitation when exposed to flux residue from a soldering process.
Dependencies are inferred from the claim text.