Methods and composition for cleaning and passivating fuel cell systems
AssigneeHoneywell International Inc.
InventorsBo Yang, Peter M. Woyciesjes, Filipe J. Marinho
Life of this patent
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Abstract
A cleaner-passivator composition and method for treating a fuel cell cooling system are described. The cleaner-passivator comprises a complexing agent, a surfactant, a corrosion inhibitor, and a solvent. The cleaner-passivator reduces the contaminants circulating in the fuel cell coolant system that contribute to increasing conductivity in the fuel cell coolant. In addition, the passivator reduces the surface corrosion in the fuel cell system.
Claims15
A cleaner-passivator composition for treatment of a fuel cell coolant system, comprising:
- a complexing agent comprising a hydroxycarboxylate, a phosphonate, a phosphinate, or a combination thereof;
- a surfactant comprising an ethylene oxide-propylene oxide block copolymer, an alkoxylated alcohol, or a combination thereof;
- a silicate, an organosilane-based compound comprising a silicon-carbon bond, a tetraalkylorthosilicate ester, or a combination thereof;
- an azole comprising tolyltriazole;
- a pyrophosphate;
- and
- a solvent.
A cleaner-passivator composition for treatment of a fuel cell coolant system, comprising:
- about 0.1 weight percent to about 50 weight percent of a complexing agent comprising a hydroxycarboxylate, a phosphonate, a phosphinate, or a combination thereof;
- about 0.003 weight percent to about 10 weight percent of a surfactant comprising an ethylene oxide-propylene oxide block copolymer, an alkoxylated alcohol, or a combination thereof;
- about 0.001 weight percent to about 10 weight percent of:
- a silicate, an organosilane-based compound comprising a silicon-carbon bond, a tetraalkylorthosilicate ester, or a combination thereof;
- an azole comprising tolyltriazole;
- and
- a pyrophosphate;
- and
- about 20 weight percent to about 99.7 weight percent of a solvent;
- wherein weight percent is based on the total weight of the cleaner-passivator composition.
A cleaner-passivator composition for treatment of a fuel cell coolant system, comprising:
- about 0.2 weight percent to about 30 weight percent of a complexing agent comprising a hydroxycarboxylate, a phosphonate, a phosphinate, or a combination thereof;
- about 0.006 weight percent to about 5 weight percent of a surfactant comprising an ethylene oxide-propylene oxide block copolymer, an alkoxylated alcohol, or a combination thereof
- about 0.005 weight percent to about 1 weight percent of a silicate, an organosilane-based compound comprising a silicon-carbon bond, a tetraalkylorthosilicate ester, or a combination thereof;
- about 0.0002 weight percent to about 2 weight percent of an azole comprising tolyltriazole;
- about 0.001 weight percent to about 1 weight percent of a pyrophosphate;
- and
- about 20 weight percent to about 99.7 weight percent of a solvent;
- wherein weight percent is based on the total weight of the cleaner-passivator composition;
- and
- wherein the cleaner-passivator composition is free of aminocarboxylates.
Dependencies are inferred from the claim text.