The essence of the process flyusovogorafinirovaniya aluminum alloys is to process the melt liquid chloride or chloride-fluoride flux. Due to differences in the wettability of contacting phases nonmetallic inclusions spontaneously pass from the metal in flux. Also in the interaction of flux with aluminum melt to develop the exchange reactions leading to oxidation of impurities and subsequent removal of them, together with the slag. Under certain circumstances when the reactions of aluminum with fluorides and chlorides can be formed subftoridov subhloridov and aluminum.
Reshayuscheevliyanie on the efficiency of the process of providing physical and chemical properties of the flux. But the degree of purification of the melt inclusions of nonmetallic and metallic impurities is largely determined by technological conditions manifold refining. These include the time of contact with the metal flux, the specific surface area of interaction (contact area), the intensity of mixing of metal and flux, the specific pacxod flux. Therefore, improved technology fluxing processing of aluminum alloys is not only in improving physical and chemical (mostly refining) the properties of flux, but also by the intensification of processes using various techniques and devices.
The variety of compositions of fluxes due to their multi-purpose large variety of compositions of aluminum alloys. Fluxes are distinguished by the value of the covering (to protect the alloy from oxidation during melting), fluxes for the scrap and slag, refining, modifying and fluxes of special purpose, for example, to protect the lining from penetrating into the aluminum alloy and purification of the lining of the accumulation or fluxes for doping .
Despite the variety of flux, in their composition of a small number of halogen compounds of chlorides and fluorides of various metals. Typically, the basis of flux are the chlorides of alkali and alkaline earth metals, which give simple additions of fluorides of alkali and alkaline earth metals, aluminum fluoride and cryolite sodium and potassium, kremneftoridy or fluoride salts of some transition metals
