Melting and casting method of aluminum alloy sacrificial anode

Abstract

The invention belongs to the technical field of corrosion and protection, and in particular relates to a casting method of an aluminum alloy sacrificial anode. The present invention firstly adds electrolytic primary aluminum liquid into the resistance furnace, then adds zinc ingots to form aluminum alloy liquid, then uses argon-loaded refining agent to carry out jet refining on the aluminum alloy liquid, and passes argon into the aluminum alloy melt after refining After degassing, use a slag removal tool to remove the oxidized scum on the surface of the aluminum alloy melt, and then add low melting point metal elements to the aluminum alloy melt. After the low melting point metal is pressed in, the melt is electromagnetically stirred , and then carry out ceramic filtration, pour the aluminum alloy melt into the preheated iron anode mold at a uniform pouring speed at 700-740°C, wait for the alloy melt to fill the mold, cool and solidify, and then take it out from the mold. An aluminum alloy sacrificial anode is obtained. The invention has the characteristics of short smelting time, small oxidation burning loss, good degassing and impurity removal capabilities, and low smelting cost.

Description

technical field [0001] The invention belongs to the technical field of corrosion and protection, and in particular relates to a melting and casting method of an aluminum alloy sacrificial anode. Background technique [0002] At present, the smelting process of aluminum alloy sacrificial anodes at home and abroad is based on primary aluminum ingots with a purity of 99.85% and zinc ingots with a purity of 99.99% as raw materials. Stirring - standing - slag removal - alloying - standing - casting and other processes, the aluminum alloy sacrificial anode is prepared. Furnaces are usually heated by electricity or gas. Since the metal ingot is heated from room temperature to 780°C, the smelting time is long, the energy consumption is high, and the oxidation and burning loss of the metal is serious. Generally, the oxidation burning loss rate is as high as 10%. Due to the lack of refining process in the smelting of sacrificial anode, there are a large number of bubbles and metal o...

AI Technical Summary

Problems solved by technology

Since the metal ingot is heated from room temperature to 780°C, the smelting time is long, the energy consumption is high, and the oxidation and burning loss of the metal is serious, and the general oxidation burning loss rate is as high as 10%.

Due to the lack of refining process in the smelting of the sacrificial anode, there are a large number of bubbles and metal oxide inclusions in the alloy, which lead to positive shift of aluminum alloy sacrificial anode potential, uneven surface dissolution, and reduced current efficiency.

In the production process of aluminum alloy sacrificial anodes, due to the gas and impurities carried by the charge itself, as well as the oxidation and burning of aluminum ingots and zinc ingots during the process of heating, smelting, and transfer, etc., and the gas is absorbed, the aluminum alloy liquid will be damaged. Avoid containing a large amount of oxide inclusions and gases, which will make the fluidity of the alloy liquid worse. After pouring, the sacrificial anode will produce a large number of oxide inclusions, pores and other casting defects, which will affect its solubility, electrochemical performance and appearance quality. Before pouring, it is refined and purified to remove these oxidized inclusions and gases and improve the quality of aluminum alloy liquid

[0003] At present, the refining of alloy melts generally includes solid refining, gas refining, and injection refining of solid and gas mixing, and gas refining is easier to remove gas substances, but the ability to remove oxide inclusions is poor; solid refining can remove oxide inclusions in the melt, but the degassing effect is general

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