High-efficiency low-strontium-consumption 4004 aluminum alloy modification method

Abstract

The invention discloses a high-efficiency low-strontium-consumption 4004 aluminum alloy modification method, which comprises the following steps that a blocky aluminum-strontium intermediate alloy is adopted as a modifier to be added into a 4004 aluminum alloy melt, and the adding amount of the strontium element is 0.008-0.01 wt%, so that the residual quantity of strontium is 0.001-0.003 wt% before casting, aiming at a high-silicon aluminum alloy, the adding amount of Sr and the refining time during smelting are controlled, and the content of strontium in the high-silicon aluminum alloy is controlled. The purpose of alloy structure modification is achieved, a silicon phase is prevented from being in a thick sheet shape or a needle shape, the line size of the silicon phase is controlled to be within 50 microns, a serious cutting effect on a matrix is prevented, the mechanical property of the alloy is improved, and the defects in the composite rolling process are avoided, so that the ideal modification effect is achieved.

Description

technical field [0001] The invention is a 4004 aluminum alloy modification method with high efficiency and low strontium consumption, and belongs to the technical field of aluminum alloy preparation. Background technique [0002] 4004 aluminum alloy is used as the cladding layer of composite aluminum foil with low melting point and good fluidity, and can be used as brazing material under certain temperature conditions. In the process of producing 4004 alloy ingots, due to the high content of silicon in the alloy, the silicon phase is in the form of coarse flakes or needles, which has a serious splitting effect on the matrix and reduces the mechanical properties of the alloy, especially the plasticity, resulting in rolling There are many defects in production. The use of modifiers to refine the silicon phase can avoid the above problems, and sodium salts and Cu-P master alloys are commonly used in the industry for modification. However, the sodium modifier will increase the...

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Problems solved by technology

[0003] Commonly used Sr modification methods are: refining: add degassing refining agent at 700-720°C for degassing refining, and remove slag after refining; standing: stand for 10-20 minutes after removing slag; modification: add aluminum at 720-730°C Strontium intermediate alloy modification agent, the addition of Sr element is 0.03-0.1wt%; pouring: pouring after modification is completed, this modification method will cause the problem of coarse silicon phase of 4004 aluminum alloy, the content of strontium added is high, and the modification effect is unstable. There is a problem of high strontium residue, so it is necessary to design a high-efficiency and low-strontium modification method for 4004 aluminum alloy to solve the above problems

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