The activation effect of Si on potassium fluoaluminate

The main K3ALF6 and KALF4 of potassium fluoaluminate were also used to remove the covering agent and the agent.
Si in complex anions ACTS as an interfacial active agent.
This kind of interface activator also includes Ge and Ti, Zr and other metals of the metal of the acid root, is belong to and cationic active agent (such as commonly used Zn, Cd, Tl, etc.) different kind of interface active agent.
However, it is similar to the process of the metallization of the parent material.
These new ecological metaclasso often have extremely high activity.
Since Si is common impurity in the reagent, and because the fluoride of compounds containing Si highly corrosive, often make the vessels (such as porcelain crucible, graphite with clay, etc.) of Si into the solder, and soldering flux of AI is to play the role of a stable Si.
According to our experimental content of 0.01%, Si is enough to form enough active layer on the surface of the parent material to make the melting point high potassium fluoaluminate to enhance its activity.
Therefore, the activation of Si is often overlooked.

In some fluoride brazing agents, both AIF3 and KF are often added to enhance their activity, and it appears that the role of dissolution and stabilization of Si is also played.