Composite melting agent for reinfing crystal grains of aluminium magnesium alloy and preparation thereof

Abstract

A composite flux for fining the crystal grains of MgAl-series Mg alloy contains magnesium chloride, potassium chloride, sodium chloride, calcium chloride, calcium fluoride, barium chloride, hexachloroethane, magnesium carbonate and calcium (or strontium) carbonate. Its advantages are high effect and high chemical stability.

Description

Technical field:

[0001] The invention relates to a novel magnesium alloy flux and a preparation method thereof, in particular to a Mg-Al series magnesium alloy grain refinement composite flux with a modification and refinement effect and a preparation method thereof. It belongs to the field of metal materials and metallurgy. Background technique:

[0002] Magnesium is chemically active. Magnesium alloys often contain a large amount of oxides and impurity elements such as Fe, Ni, and Cu. These impurities significantly reduce the mechanical properties and corrosion resistance of magnesium alloys. Therefore, during the smelting process of magnesium alloys, fluxes should be used for refining treatment. The purpose of refining treatment is to remove impurity elements and non-metallic inclusions such as oxide scales mixed into the alloy. It is required that the flux can adsorb impurities well and be completely separated from the magnesium alloy melt to avoid flux inclusions, othe...