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US 7,407,534 B2Granted
Method of fabricating pipe for absorbing fuel evaporation gas for automobiles
AssigneeHyundai Motor Company
InventorSung Mu Choi
Life of this patent
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Abstract
A pipe for adsorbing fuel evaporation gas in automobiles. An aluminum pipe portion is etched with acid or base so as to increase its surface area and improve its coating properties. The pipe is subjected to a thermal treatment to further improve its coating properties due to creation of an oxidation layer through such etching process, and then is coated at the surface thereof with zeolite slurry with improved adhesion, thereby effectively adsorbing the evaporation gas in terms of performance, endurance and layout.
Claims7
A method of fabricating a pipe for adsorbing evaporation gas for automobiles, comprising:
- etching a surface of an aluminum pipe with a weak acid or weak base solution and drying the etched pipe;
- subjecting the etched pipe to a heat treatment under an oxidizing atmosphere;
- mixing colloidal silica, zeolite (Si/Al>500) and water with one another to prepare a mixture in the form of a slurry, and then coating the surface of the heat-treated aluminum pipe with the resultant slurry mixture;
- and
- firing and drying the coated aluminum pipe at a temperature of about 300 to 500° C. for about two to four hours.
2 more elements
Dependencies are inferred from the claim text.