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US 12,280,454 B2Granted
Flux for brazing
AssigneeSolvay SA
InventorsUlrich Seseke-Koyro, Andreas Becker
Life of this patent
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Abstract
The invention concerns a flux for brazing, a process for brazing metal parts employing said flux, a flux composition containing said flux, aluminum parts coated with said flux or said flux composition, a process for brazing and a brazed metal object obtainable by said brazing process. The flux is high in KAlF4 and low in K3AlF6.
Claims17
A flux comprising a fundamental flux, wherein the fundamental flux comprises:
- from 80 mol % to 100 mol % KAlF4, and
- one or more components selected from the group consisting of K2AlF5, K3AlF6, potassium fluorozincates, cesium fluoroaluminates, potassium fluorostannates and cesium fluorostannates, and hydrates thereof, wherein the one or more components are comprised in the fundamental flux from 0 to 20 mol %, adding up with the content of KAlF4 to 100 mol %,
- wherein the content of K3AlF6 in the fundamental flux is equal to or lower than 2 mol % including 0 mol %,
- wherein the content of free KF in the flux is lower than 0.2% by weight including 0% by weight, and
- wherein the flux further comprises from 0.1 to 8 weight % relative to the total weight of the flux of at least one additive salt selected from group consisting of BaF2 and SrF2.
2 more elements
Dependencies are inferred from the claim text.