Methods and composition for cleaning and passivating fuel cell systems
AssigneePrestone Products Corporation
InventorsBo Yang, Peter M. Woyciesjes, Filipe J. Marinho
Life of this patent
Estimating the term…
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.
Claims24
A method of treating a fuel cell coolant system comprising:
- contacting the fuel cell coolant system with a cleaner-passivator composition, and
- rinsing the fuel cell coolant system with a rinse solvent;
- wherein the cleaner-passivator composition comprises a complexing agent, a surfactant, a corrosion inhibitor, and a solvent.
A method of treating a fuel cell coolant system comprising:
- contacting the fuel cell coolant system with a cleaner-passivator composition, wherein the cleaner-passivator composition comprises a complexing agent, a surfactant, a corrosion inhibitor, and a solvent;
- rinsing the fuel cell coolant system with a rinse solvent;
- and
- contacting the fuel cell coolant system with a coolant after rinsing, wherein contacting with the cleaner-passivator composition is sufficient to maintain a coolant conductivity below about 5 microseamens/cm after about 1 hour of exposure of the fuel cell coolant system to the coolant, wherein the coolant comprises about 10 wt % to about 100 wt % of water and about 0 wt % to about 90 wt % of an alcohol.
A method of treating a fuel cell coolant system comprising:
- contacting the fuel cell coolant system with a cleaner-passivator composition;
- and
- rinsing the fuel cell coolant system with a rinse solvent;
- wherein the cleaner-passivator composition is in the form of a two-part composition comprising a cleaner composition and a passivator composition, wherein the cleaner composition comprises a complexing agent, a surfactant, a corrosion inhibitor, and a solvent and has a pH of about pH 1 to about pH 13, and the passivator composition comprises the corrosion inhibitor and the solvent, and has a pH of about pH 6 to about pH 13.
Dependencies are inferred from the claim text.