Aluminum alloy slag remover mainly melts through three methods of adsorption, dissolution and compounding. The dissolution is mainly achieved by adding a chemical substance that can dissolve the inclusions in the slag, and dissolve it according to its similar physical and chemical properties, and then remove it with the flux. For example, Na3AlF6 can dissolve Al2O3. The chemical reaction is through the chemical reaction between the flux and the slag to generate other easily removable compounds to achieve the purpose of removal, such as Na2SiF6, and the remaining Al2O3 reaction to generate Na3AlF6 and AlF3 can all be refined through other mechanisms.
At present, high-performance alloys are developing in the direction of large specifications, and the requirements for the size of cast slabs are gradually increasing. Residual gases, impurities, slag and alkali/alkaline earth metals in the aluminum alloy melt are harmful to the deformation and use of the casting billet.
The inclusions in the aluminum melt include solid inclusions such as carbides, nitrides, oxides, hydrides, borides and metal inclusions such as iron, silicon, zinc and manganese. Among them, Al2O3 is the main component, accounting for 95% of the inclusions. The size of the non-metallic inclusions in the aluminum melt is between a few to tens of microns, which is very harmful. The non-metal oxide inclusions and matrix of aluminum alloy materials have different performance parameters, such as elastic modulus, hardness and expansion coefficient. Under the action of external force, the stress concentration may occur at the sharp corners of the oxidized inclusion phase, which will cut off the matrix structure, cause the product to leak or be prone to rot, and significantly reduce the mechanical properties and stress corrosion resistance. The presence of slag will also reduce the fluidity of the alloy and the ability to fill the mold, and increase the possibility of casting defects. During the heat treatment process, it increases the inhalation tendency of the aluminum melt, prevents the diffusion and precipitation of gas, and promotes the formation of secondary pores and voids.
AdTech produces Aluminum alloy Slag Remover fluxes for dross removal. AdTech refining agent uses unique technology to enhance the traditional molten metal degassing and slag removal effect.