The use of fluxes to remove hydrogen from the aluminum melt is completely mechanical. The smaller bubbles formed will also rise to the surface at a slower rate, thereby allowing more contact time between the melt and the degassing agent.
Because the flux has a high wetting effect on the surface, it provides better adhesion of oxides and particles. This, combined with smaller bubbles, exposes more gas to the melt, making the solvent an excellent medium for removing particles and oxides.
In practice, it is simple to use only inert gas for refining. The gas is stored in liquid form from the gas cylinder bundle or gas storage tank, and is vaporized before entering the pipeline supply system. The inert gas passes through the pressure regulator and dosing unit. In refining, according to the choice of equipment, gas is introduced into the melt through porous plugs, spray guns, or through rotating equipment or similar equipment.
Pure inert gases (such as nitrogen and argon) can only achieve a certain level of absolute hydrogen removal. In order to be lower than the predetermined value, another gas must be mixed with nitrogen or argon. Similarly, pure inert gas does not perform well in removing particles, oxides, and elements, so it is necessary to mix inert gas with reactive gas.
Fluxes for aluminum melt are used to describe aluminum melt processing in which compounds are used. These compounds are usually inorganic and can perform multiple functions such as degassing, reducing calcium, removing impurities, and forming alloys. Aluminum casting flux also includes treating the melt with inert gas or reactive gas to remove inclusions or gaseous contaminants from the metal. Liquid Aluminium Flux (in powder, flake, or granular form) is usually composed of chloride and fluoride and additional additives to give it special properties. When mixing inert gases with fluxes, it is important to mix these gases correctly.
