Flux for brazing
OwnerUlrich SESEKE-KOYRO, Andreas BECKERinventors
Life of this patent
Estimating the term…
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.
Claims20
A flux comprising a fundamental flux, wherein the fundamental flux comprises from 80 mol % to 100 mol % KAlF4, the content of K3AlF6 in the flux is equal to or lower than 2 mol % including 0 mol %, 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 20 weight % relative to the total weight of the flux of at least one additive salt, wherein the at least one additive salt comprises at least one anion selected from the group consisting of F−, CO32−, O2−, nitrate, phosphate, borate, metaborate and oxalate, and at least one cation selected from the group consisting of earth alkali metal cations.
Dependencies are inferred from the claim text.