Refining agent for aluminum alloy containing high proportion of returned materials and its application method

Abstract

The invention discloses a refining agent for aluminum alloys containing a high proportion of returned charge and a method for using the same. The refining agent includes general components and functional components, and the general components include chloride metal salts, fluorine metal salts, and fluoroaluminate Or one or two of fluorosilicates; functional components include the following components: niobium alloy, copper alloy, metal zinc, rare earth. After the refining agent of the present invention is added to the aluminum alloy melt containing a high proportion of recycled materials, it can fully diffuse from bottom to top without adsorption and agglomeration, quickly exerts the refining effect, and obtains a high-purity aluminum alloy melt. When it is used to refine aluminum alloy melt containing a high proportion of returned materials, the hydrogen content of the aluminum melt can be reduced to a level not exceeding 0.10ml / 100g Al, and the total oxygen content of the aluminum melt can be reduced to 80ppm. In addition to its excellent degassing and impurity removal effects, the refining agent can also significantly reduce the number and size of β‑Al5FeSi phase in the casting structure, eliminate the harmful effect of impurity iron in aluminum alloys, and thus improve the mechanical properties of cast aluminum alloy castings performance and yield.

Description

technical field

[0001] The invention relates to the smelting and processing technology of cast aluminum alloy, more particularly, refers to a refining agent for aluminum alloy containing a high proportion of recycled material and its application method. The refining agent can make the aluminum alloy return material be recycled as a resource. Background technique

[0002] With the rapid development of the automobile industry, energy, environment and safety issues are becoming increasingly prominent, and the demand for aluminum alloys is increasing. The development and application of high-performance aluminum alloy parts to meet the needs of lightweight design is becoming more and more urgent. Cast aluminum alloy has become a widely used material for auto parts due to its excellent casting fluidity, physical properties, corrosion resistance and machinability. However, in the production process of aluminum alloy castings, due to the corrosion of raw materials to form "aluminum...

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