Joint crevice corrosion inhibitor
AssigneeBlackstone Corporation
InventorsPaul K. Beatenbough, David J. Twichell, Lavoyce G. Dey
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Abstract
This invention is to an improved method for reducing crevice corrosion in assembly joints of aluminum fluid handling devices, the improvement comprising, providing a series of spaced ribs at the assembly joint configured to intermittently resist engagement of components along an elongated assembly crevice sufficient to segment the crevice into a plurality of minor assembly crevices dimensioned to permit substantial mixing of fluid within the minor crevices with fluid being handled by the device. The invention has particular utility in automotive heat exchangers wherein crevices at joints where polymeric tanks are assembled to aluminum metal headers are susceptible to crevice corrsion.
Claims26
An improved method for reducing crevice corrosion in fluid handling devices wherein an aluminum surface of a first component is joined to a second component in a gasket sealed joint comprising an elongated assembly crevice, the improvement comprising providing a series of spaced ribs at said joint, said ribs being configured to intermittently resist engagement of said second component to said first component along said elongated assembly crevice sufficient to segment said elongated assembly crevice into a plurality of minor assembly crevices, interspaced between said ribs, a plurality of said minor crevices being dimensioned to permit substantial mixing of fluid isolated within said minor crevices with fluid being handled by the device.
A header tank assembly for an automotive radiator comprising an aluminum heat exchanger header sheet, deformed to engage a polymeric header tank containing multiple inwardly extending spaced ribs, said tank and header being joined at a fluid tight, elastomeric gasket sealed, assembly joint comprising crevices extending between said mutiple ribs, and crevices being dimensioned to permit substantial mixing of fluid isolated within said crevices with fluid flowing through said radiator.
Dependencies are inferred from the claim text.