Patent ID: 7393464
Filing Date: 2008-07-01
Classification: B60L,C09K,H01M,Y02E,Y02T

Abstract:
1. A method of protecting fuel cell drives from corrosion using cooling systems which are based on antifreeze concentrates based on alkylene glycols or derivatives thereof, from which ready-to-use aqueous coolant compositions having a conductivity of not more than 50 μS/cm result, wherein the anti-freeze concentrates contain orthosilicic esters of the formula I where R 1 to R 4 are identical or different and are C 1 - to C 20 -alkyl, C 2 - to C 20 -alkenyl, C 1 - to C 20 -hydroxyalkyl, unsubstituted or substituted C 6 - to C 12 -aryl and/or a glycol ether substituent of the formula —(CH 2 —CH 2 —O) n —R 5 , where R 5 is hydrogen or C 1 - to C 5 -alkyl and n is from 1 to 5.