Fluxes for foundry. Fluxing agents (solders)
The essence of the process of flux refining of aluminum alloys is in the
processing of the melt with liquid chloride or chloride-fluoride flux. Due to
differences in the wettability of the contacting phases non-metallic
inclusions spontaneously transform from metal into flux. Also during the
interaction of fluxes with the aluminum melt exchange reactions occur that
lead to oxidation of impurities and their subsequent disposal along with
the slag. In some conditions during reactions of aluminum with fluoride
and chloride, the formation of subfluoride and aluminum subchloride may
occur.
Physical and chemical properties of flux have decisive influence on the efficiency of the process. But the degree of purification from the melt inclusions and metallic impurities is largely determined by diverse technological conditions of 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 use of flux. Therefore, improvement of technology of flux processing of aluminum alloys happen not only in improvement of physical and chemical (mostly refining) properties of flux but also in intensification of the processes by means of various techniques and devices.
A variety of flux compositions is due to their multiple purposes and a wide variety of compositions of aluminum alloys. Fluxes are distinguished by the value of the covering (for protection against oxidation of the alloy during melting), fluxes for the processing of scrap and slag, refining, modifying and fluxes for special purposes, such as lining for protection against the ingress of aluminum alloys and cleaning of the lining or the accretion fluxes for doping.
Despite the variety of fluxes, their compositions consist of a small number of halogen compounds of chlorides and fluorides of various metals. As a rule, the basis of fluxes are of chlorides of alkali and alkaline earth metals into which the following are introduced: aluminum fluoride and sodium cryolites, silicon fluorides and potassium salts of some transition metals.
We offer granulated slag-forming flux CRYSTAL 2000
Manufacturer: «A.Cesana S.r.l», Italy
Packaging: 25 kg paper bags
