Flux preparation with increased dynamic viscosity containing dehydrated K2A1F5, method to produce it and method to use it
AssigneeSolvay Fluor GmbH
InventorAlfred Ottmann
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Abstract
Aqueous flux preparations with increased dynamic viscosity are provided. In the flux preparations, irreversibly dehydrated K2AlF5 (also denoted as orthorhombic K2AlF5 or phase II salt) provides for an increase of the dynamic viscosity if the aqueous flux preparations are aged, i.e., a contact between water comprised in the preparation and irreversibly dehydrated K2AlF5 is maintained for a certain time span, preferably for at least 12 minutes. The higher viscosity improves the brazing process, for example because less flux preparation drops off from the parts to be brazed.
Claims21
An aged aqueous flux preparation comprising water and irreversibly dehydrated K2AlF5.
A method for increasing the viscosity of an aqueous flux preparation comprising a flux for brazing of parts of aluminum or brazing of parts of aluminum alloys to parts of aluminum, aluminum alloys, steel, copper, or titanium, wherein irreversibly dehydrated K2AlF5 is present in the aqueous flux preparation, and wherein the aqueous flux preparation is aged for at least 12 minutes.
A method for the manufacture of a flux preparation comprising water and irreversibly dehydrated K2AlF5, wherein the irreversibly dehydrated K2AlF5 is contacted with water or a mixture of water and an organic liquid, and then aged.
Dependencies are inferred from the claim text.