Rare earth-free aluminum alloy and preparation method and application thereof

Abstract

The invention belongs to the technical field of aluminum air batteries, and particularly relates to a rare earth-free aluminum alloy and a preparation method and application thereof. The rare earth-free aluminum alloy comprises the following element components in percentage by mass: 0.2 to 1.0 percent of Bi, 0.05 to 0.2 percent of In, 0.2 to 1.0 percent of Mg, and the balance Al. According to the rare earth-free aluminum alloy and the preparation method and application thereof, Bi, In and Mg are added into an aluminum matrix, a compact oxide film is destroyed through hole action and eutectic melt, the resistance of the oxide film is reduced, and when the alloy is applied to an anode of an aluminum air battery, the electrochemical activity of the anode is improved, so that the discharge voltage and energy density of the aluminum air battery are further improved.

Description

technical field

[0001] The invention belongs to the technical field of aluminum-air batteries, and in particular relates to a rare earth-free aluminum alloy and its preparation method and application. Background technique

[0002] As a new type of energy battery, aluminum-air batteries are widely used in transportation, industrial production, and marine emergency equipment because of their advantages such as light weight, zero pollution, high specific energy, low cost, and good safety.

[0003] Traditional aluminum-air batteries use pure aluminum as the anode material, but only when the purity of aluminum reaches more than 99.999% can it be used as an anode for aluminum-air batteries, which has high requirements for the electrolytic preparation process of aluminum and increases the cost of the battery, so , usually requires alloying treatment. By adopting the alloying treatment, while reducing the cost, it can also meet the requirements for use as an aluminum-air battery an...

Examples

preparation example Construction

[0030] The present invention also provides a preparation method for the rare earth-free aluminum alloy described in the above technical solution, comprising the following steps:

[0031] According to the mass ratio of metal elements in the above-mentioned rare earth-free aluminum alloy, Bi source, In source, Mg source and Al source are mixed and melted to obtain a melt;

[0032] After casting the molten liquid, rolling and annealing are performed in sequence to obtain the rare earth-free aluminum alloy.

[0033] In the present invention, unless otherwise specified, all raw materials are commercially available products well known to those skilled in the art.

[0034] The present invention mixes and melts Bi source, In source, Mg source and Al source according to the mass ratio of metal elements in the above-mentioned rare earth-free aluminum alloy to obtain molten liquid.

[0035] In the present invention, the Al source is preferably aluminum metal, the Bi source is preferably...

Embodiment 1

[0048] Melt metal aluminum at 760°C for 10 minutes to obtain molten aluminum;

[0049] Add metal bismuth, metal indium and metal magnesium wrapped in aluminum foil into the molten aluminum, and carry out the second melting under stirring. The melting temperature is 760°C and the time is 10 minutes to obtain the molten liquid;

[0050] Preheat the mold to 240°C, pour the molten liquid into the mold and cast it into the mold. The casting time is 5 minutes to obtain a 1cm thick molded plate;

[0051] The formed plate is cold-rolled, and the thickness is reduced to 0.1 cm in each pass, and a rolled plate with a thickness of 0.2 cm is obtained after rolling 8 times;

[0052] The rolled sheet was annealed at 350°C for 6 hours to obtain a rare earth-free aluminum alloy.

Embodiment 2～5 and comparative example 1～3

[0054] Aluminum alloys were prepared according to the method of Example 1, wherein the components of each example and comparative example are shown in Table 1.

[0055] Table 1 The composition of the aluminum alloys prepared in Examples 1-5 and Comparative Examples 1-3

[0056] Bi / wt% In / wt% Mg / wt% Al / wt% Example 1 0.2 0.075 0.5 99.225％ Example 2 0.4 0.075 0.5 99.025％ Example 3 0.6 0.075 0.5 98.825％ Example 4 0.8 0.075 0.5 98.625％ Example 5 1.0 0.075 0.5 98.425％ Comparative example 1 0 0 0 100％ Comparative example 2 0 0.075 0.5 99.425％ Comparative example 3 0 0.5 0.5 99.0％

technical field

[0001] The invention belongs to the technical field of aluminum-air batteries, and in particular relates to a rare earth-free aluminum alloy and its preparation method and application. Background technique

[0002] As a new type of energy battery, aluminum-air batteries are widely used in transportation, industrial production, and marine emergency equipment because of their advantages such as light weight, zero pollution, high specific energy, low cost, and good safety.

[0003] Traditional aluminum-air batteries use pure aluminum as the anode material, but only when the purity of aluminum reaches more than 99.999% can it be used as an anode for aluminum-air batteries, which has high requirements for the electrolytic preparation process of aluminum and increases the cost of the battery, so , usually requires alloying treatment. By adopting the alloying treatment, while reducing the cost, it can also meet the requirements for use as an aluminum-air battery an...

Examples

preparation example Construction

[0030] The present invention also provides a preparation method for the rare earth-free aluminum alloy described in the above technical solution, comprising the following steps:

[0031] According to the mass ratio of metal elements in the above-mentioned rare earth-free aluminum alloy, Bi source, In source, Mg source and Al source are mixed and melted to obtain a melt;

[0032] After casting the molten liquid, rolling and annealing are performed in sequence to obtain the rare earth-free aluminum alloy.

[0033] In the present invention, unless otherwise specified, all raw materials are commercially available products well known to those skilled in the art.

[0034] The present invention mixes and melts Bi source, In source, Mg source and Al source according to the mass ratio of metal elements in the above-mentioned rare earth-free aluminum alloy to obtain molten liquid.

[0035] In the present invention, the Al source is preferably aluminum metal, the Bi source is preferably...

Embodiment 1

[0048] Melt metal aluminum at 760°C for 10 minutes to obtain molten aluminum;

[0049] Add metal bismuth, metal indium and metal magnesium wrapped in aluminum foil into the molten aluminum, and carry out the second melting under stirring. The melting temperature is 760°C and the time is 10 minutes to obtain the molten liquid;

[0050] Preheat the mold to 240°C, pour the molten liquid into the mold and cast it into the mold. The casting time is 5 minutes to obtain a 1cm thick molded plate;

[0051] The formed plate is cold-rolled, and the thickness is reduced to 0.1 cm in each pass, and a rolled plate with a thickness of 0.2 cm is obtained after rolling 8 times;

[0052] The rolled sheet was annealed at 350°C for 6 hours to obtain a rare earth-free aluminum alloy.

Embodiment 2～5 and comparative example 1～3

[0054] Aluminum alloys were prepared according to the method of Example 1, wherein the components of each example and comparative example are shown in Table 1.

[0055] Table 1 The composition of the aluminum alloys prepared in Examples 1-5 and Comparative Examples 1-3

[0056] Bi / wt% In / wt% Mg / wt% Al / wt% Example 1 0.2 0.075 0.5 99.225％ Example 2 0.4 0.075 0.5 99.025％ Example 3 0.6 0.075 0.5 98.825％ Example 4 0.8 0.075 0.5 98.625％ Example 5 1.0 0.075 0.5 98.425％ Comparative example 1 0 0 0 100％ Comparative example 2 0 0.075 0.5 99.425％ Comparative example 3 0 0.5 0.5 99.0％

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