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Potassium fluoaluminate is the main component of aluminum alloy non - corrosion brazing

Aluminum alloys are more difficult to brazing, especially alloys with high magnesium content.Their flux is mainly composed of chloride, fluoride and some heavy metal ions.
But this kind of soldering flux soldering after cleaning is difficult, will cause carelessly a bit corrosion. Relatively large areas of overlap, brazing seam in slag almost difficult to avoid, ant nest of defects, it usually does not exist the allied air hole, if for machining, formed the mouth of the cave, soldering flux due to the gradual expansion of moisture absorption will destroy joint. Developed during the past 20 years, the so-called Noeolok (No. - corrosive look) soldering flux, because insoluble in wood, No moisture absorption and become "No corrosion flux".
It is mainly composed of two intermediate compounds K3AlF6 and KAIF4 eutectic salt in AlF3 and KF system.

In recent years, aif3-csf and alf3-csf -KF brazing agents have been developed in recent years, which are especially suitable for brazing alloy and magnesium alloys with high magnesium content and have special effect on removing magnesium oxide film.

Potassium fluoaluminate