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Fluoroaluminate (potassium cryolite) can be better applied to aluminum alloy.

Fluoride potassium aluminate is a eutectic aluminum soldering flux, using KF - the eutectic point of ALF3 is composed of aluminum fluoride mixed acid potassium salt as flux, namely between two intermediate compounds K3AlF6 - KAlF4 eutectic point of molten salt, is developed in the late 1970 s, no corrosion, insoluble soldering flux, aluminum processing level is greatly increased.
But is worthy of aluminium fluoride eutectic solder melting point on the high side, and are used with the melting point of filler metals differ, limited to al-si filler metals, thus limits can be the kinds of aluminum alloy brazing.
In the process of preparation of potassium fluoaluminate, a third or more salt is added to improve the performance and application of the flux.
It is generally accepted that the smaller the particle size is, the better the performance is.

Therefore, the nano-fluoroaluminate eutectic aluminum flux has the characteristics of the aluminum flux which is not prepared by the usual standard method.

Fluoroaluminate (potassium cryolite) can be better applied to aluminum alloy.