Casting method of aluminum alloy sacrificial anode

A sacrificial anode and aluminum alloy melt technology, which is applied in the field of corrosion and protection, can solve the problems of reduced current efficiency, general degassing effect, and poor ability to remove oxide inclusions, so as to avoid the influence of anode performance and shorten the melting time , The effect of shortening the melting time

CN103740957AInactive Publication Date: 2014-04-23NORTHEASTERN UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-04-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the technical field of corrosion and prevention, and in particular relates to a casting method of an aluminum alloy sacrificial anode. The casting method comprises the following steps: adding basic electrolytic molten aluminum to a resistance furnace; then adding a zinc ingot to obtain molten aluminum alloy; performing jet refining on the molten aluminum alloy by adopting an argon located refining agent; charging argon to refined aluminum alloy melt to degas; drossing oxidizing scum on the surface of the aluminum alloy melt through a drossing tool; adding a low melting point metallic element to drossed aluminum alloy melt; electromagnetically agitating the melt after pressing the low melting point metal; carrying out ceramic filtering; pouring and casting the aluminum alloy melt to a preheated iron anode mould at an even casting speed under the temperature of 700 to 740 DEG C until the mould is full of the aluminum alloy melt; and moving the aluminum alloy melt out of the mould after cooling, solidifying and molding, so as to obtain the aluminum alloy sacrificial anode. The casting method has the characteristics of being short in smelting time, small in loss of iron scale, high in degassing and purifying performances, and low in smelting cost.
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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...

Examples

Embodiment 1

[0029] (2) Argon loading composition is 39% NaCl+50%KCl+4.4%CaF 2 +6.6%Na 3 AlF 6 The refining agent is spray-refined on the aluminum alloy liquid, the refining temperature is 720°C, the amount of refining agent accounts for 0.6% of the total charge, and the refining time is 20 minutes to obtain a refined aluminum alloy melt;

[0030] (3) After refining, pass argon gas into the aluminum alloy melt for degassing. The degassing time is 7 minutes. The degassed aluminum alloy melt is allowed to stand for 20 minutes, and then use a slag removal tool to remove the surface of the aluminum alloy melt. oxidation scum;

[0031] (4) Add low-melting-point metal element In into the aluminum alloy melt after slag removal, In is pressed in with a bell jar in the form of high-purity aluminum foil wrapping, and the pressing time is 1 minute;

[0032] (5) After the low-melting-point metal is pressed in, electromagnetically stir the melt for 5 minutes, and then perform ceramic filtration to o...

Embodiment 2

[0041] (2) Argon loading composition is 39% NaCl+50%KCl+4.4%CaF 2 +6.6%Na 3 AlF 6 The refining agent is spray-refined on the aluminum alloy liquid, the refining temperature is 740°C, the amount of refining agent accounts for 0.3% of the total charge, and the refining time is 30 minutes to obtain a refined aluminum alloy melt;

[0042] (3) After refining, pass argon gas into the aluminum alloy melt for degassing. The degassing time is 15 minutes. After degassing, the aluminum alloy melt is left to stand for 5 minutes, and then use a slag removal tool to remove the surface of the aluminum alloy melt. oxidation scum;

[0043] (4) Add low-melting-point metal elements In and Mg to the aluminum alloy melt after slag removal, and press it in with a bell jar in the form of high-purity aluminum foil wrapping, and the pressing time is 2 minutes;

[0044] (5) After the low-melting-point metal is pressed in, electromagnetically stir the melt for 15 minutes, and then perform ceramic fil...

Embodiment 3

[0053] (2) Argon loading composition is 39% NaCl+50%KCl+4.4%CaF 2 +6.6%Na 3 AlF 6 The refining agent is spray-refined on the aluminum alloy liquid, the refining temperature is 780°C, the amount of refining agent accounts for 0.5% of the total charge, and the refining time is 5 minutes to obtain a refined aluminum alloy melt;

[0054] (3) After refining, pass argon gas into the aluminum alloy melt for degassing. The degassing time is 10 minutes. The degassed aluminum alloy melt is left to stand for 10 minutes, and then use a slag removal tool to remove the surface of the aluminum alloy melt. oxidation scum;

[0055] (4) Add low-melting-point metal elements In and Cd to the aluminum alloy melt after slag removal, and press it in with a bell jar in the form of high-purity aluminum foil wrapping, and the pressing time is 1.5 minutes;

[0056] (5) After the low-melting-point metal is pressed in, electromagnetically stir the melt for 25 minutes, and then perform ceramic filtratio...