Aluminum alloy for hydrogen production and preparation method thereof

Abstract

The invention provides an aluminum alloy for hydrogen production and a preparation method thereof. The aluminum alloy for hydrogen production comprises the following elements in percentage by mass: 80-96% of aluminum, 1.25-10% of gallium, 2-18% of indium and tin and 0.1-5% of water-soluble inorganic salt. Wherein the water-soluble inorganic salt contains a chlorine element. The aluminum alloy for hydrogen production is doped with the water-soluble inorganic salt aluminum alloy containing the chlorine element, the hydrogen yield of the aluminum alloy for hydrogen production can be increased, meanwhile, under the condition of the same hydrogen yield, the doping amount of precious metal gallium, indium and indium can be reduced through doping of the water-soluble inorganic salt, and therefore the production cost can be reduced. In addition, the aluminum alloy for hydrogen production can be used for hydrogen production in a block shape, transportation and storage are convenient, the preparation process can be simplified, and energy consumption can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum alloy hydrogen production, and in particular to an aluminum alloy for hydrogen production and a preparation method thereof. Background Art

[0002] Hydrogen energy is an ideal new energy source. Its combustion products are not only clean but also do not have any adverse effects on the air and environment, nor will they cause a greenhouse effect. Hydrogen has a very ideal calorific value. Except for nuclear fuel, the calorific value of hydrogen is the highest among all currently known fuels (142351kJ / kg), which is equivalent to three times the calorific value of gasoline. Hydrogen energy can be used in various forms. It can generate heat energy through combustion, and it can also be used as a fuel for fuel cells to generate electricity. Hydrogen energy has many excellent properties, which makes it occupy a very important position in the current development and exploration of new energy sources.

[0003] As a secondary energy source, the utilization process of hydrogen energy needs to go through three important links: hydrogen preparation, storage and transportation, and release and application. According to the different sources of hydrogen, the commonly used preparation methods can be divided into fossil fuel hydrogen production, water hydrogen production, biomass hydrogen production and other hydrogen production methods. Fossil fuel reforming hydrogen production occupies a major share of the hydrogen market. It mainly uses coal, oil and natural gas as raw materials, and a large amount of carbon dioxide will inevitably be released in the complex preparation process. In addition, water electrolysis hydrogen production has long faced the problem of low energy efficiency, and biomass processing technology is still in the laboratory research stage due to the problem of hydrogen purification. Hydrogen can be stored and transported in gaseous, liquid and solid forms. The gaseous form has a low hydrogen storage density and needs to be transported through a complete pipeline system. When hydrogen is liquefied and stored, due to its low melting point and the high latent heat of vaporization of 455kJ / kg, the large heat transfer temperature difference between it and the environment makes it difficult to store liquid hydrogen for a long time, and the storage cost is high. The hydrogen storage form of solid hydride cannot fully meet the requirements of transportation vehicles for gas sources, and thus has not reached the level of large-scale commercial application. Therefore, the green and efficient preparation and convenient transportation of hydrogen are important factors currently restricting the development of hydrogen.

[0004] The hydrogen produced by metal hydrolysis is of high purity and can directly provide a hydrogen source for fuel cell systems. Among the common metal elements, lithium, sodium, and potassium are highly active and can react with cold water at room temperature to produce hydroxides and hydrogen. However, the storage conditions of such metal materials are harsh, and the hydrolysis products are highly alkaline and highly corrosive to reaction containers. Therefore, they are not suitable for large-scale commercial applications. Metal elements with poor activity, such as zinc, iron, and tin, usually need to react with water vapor at high temperatures to produce metal oxides and hydrogen. Metal elements with intermediate metal activity, such as magnesium and aluminum, have relatively low requirements for reaction conditions and the products are less corrosive. They are the most common metal hydrolysis materials.

[0005] Among all metal materials used for hydrogen production, aluminum is considered to be the most attractive energy carrier. The content of aluminum in the earth's crust ranks third only to oxygen and silicon, and it is the most abundant metal element in the earth's crust. Moreover, aluminum not only has high energy density, low price, and small unit volume mass, but also the by-products of aluminum hydrolysis are aluminum oxide or aluminum hydroxide precipitates, which are environmentally friendly and can be prepared into high value-added industrial products, such as sewage treatment agents and flame retardants.

[0006] Although metallic aluminum can react with water to directly produce high-purity hydrogen, the oxide film on its surface severely limits the further progress of the reaction. Although the binary alloy formed by Al and Ga can react with water to produce hydrogen at room temperature, its hydrogen production performance is not very ideal. The quaternary alloy prepared by adding In and Sn to the Al-Ga binary alloy has a high hydrogen production performance, but due to the large demand for metal In, the preparation cost is relatively high. In addition, in order to further improve the hydrogen production performance of aluminum alloys, the commonly used method is to make aluminum alloys into powder products, but there are obvious deficiencies in its transportation and storage, and explosions may occur due to insufficient purity. Therefore, it is urgent to develop an aluminum alloy with excellent hydrogen production performance, low preparation cost, and convenient transportation and storage. Summary of the invention

[0007] The main purpose of the present invention is to provide an aluminum alloy for hydrogen production and a preparation method thereof, so as to solve the problems in the prior art that the aluminum alloy has poor hydrogen production performance, high preparation cost and is inconvenient to transport and store.

[0008] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an aluminum alloy for hydrogen production, which comprises the following elements, in terms of mass percentage: 80-96% aluminum, 1.25-10% gallium, 2-18% indium and tin, and 0.1-5% water-soluble inorganic salt; wherein the water-soluble inorganic salt contains chlorine.

[0009] Furthermore, the aluminum alloy for hydrogen production includes the following elements, in terms of mass percentage: 83-92% aluminum, 2-7% gallium, 3.5-13% indium and tin, and 1.5-5% water-soluble inorganic salts.

[0010] Furthermore, the mass ratio of the water-soluble inorganic salt to aluminum is 0.015 to 0.055:1, preferably 0.02 to 0.05:1.

[0011] Furthermore, the mass ratio of indium to tin is 0.2 to 3:1; and / or, indium and tin in the aluminum alloy for hydrogen production exist in the form of indium tin metal compounds, and / or, the indium tin metal compound is In3Sn and / or InSn4, and preferably the mass of In3Sn is 60 to 90% of the indium tin metal compound.

[0012] Furthermore, the water-soluble inorganic salt is NaCl and / or KCl.

[0013] Furthermore, the aluminum alloy for hydrogen production is in block form, and / or the average size of the aluminum alloy for hydrogen production is centimeter-level or above, preferably 1 to 5 centimeters.

[0014] According to another aspect of the present invention, there is provided a method for preparing an aluminum alloy for hydrogen production according to any one of claims 1 to 6, characterized in that the preparation method comprises: step S1, mixing and smelting raw materials corresponding to the aluminum alloy for hydrogen production according to any one of claims 1 to 6 to obtain a melt; and step S2, stirring and casting the melt to obtain the aluminum alloy for hydrogen production.

[0015] Furthermore, in the above step S1, the smelting temperature is 50 to 300°C higher than the melting point of the water-soluble inorganic salt; and / or the smelting temperature is 900 to 950°C; and / or the smelting insulation temperature is 900 to 950°C, and / or the smelting insulation time is 0.5 to 2h; and / or the smelting atmosphere is nitrogen and / or argon.

[0016] Furthermore, in the above step S2, the stirring speed is 500-1000 rpm, and / or the stirring time is 1-3 h.

[0017] Furthermore, in the above step S2, cooling is performed after casting, and the cooling is air cooling; and / or the casting temperature is 780-850°C.

[0018] By applying the technical solution of the present invention, the present invention dopes the aluminum alloy for hydrogen production with a water-soluble inorganic salt containing chlorine. During the hydrolysis process of the aluminum alloy for hydrogen production, the water-soluble inorganic salt dissolves to form a local high-concentration Cl - region, which is more conducive to destroying the oxide film formed on the Al grains, thereby promoting the hydrolysis reaction of the aluminum alloy for hydrogen production and improving the hydrogen yield of the aluminum alloy for hydrogen production. At the same time, under the condition of the same hydrogen yield, the doping of water-soluble inorganic salts can reduce the doping amount of precious metals gallium, indium, and indium, thereby reducing production costs. In addition, the aluminum alloy for hydrogen production of the present invention can be used for hydrogen production in a block form, which is not only convenient for transportation and storage, but also can simplify the preparation process and reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 Optical photographs of aluminum alloys for hydrogen production in Examples 1 to 4 of the present application are shown;

[0021] Figure 2 The X-ray analysis diagram of the aluminum alloy for hydrogen production in Examples 1 to 4 of the present application is shown;

[0022] Figure 3 The microscopic morphology of the cross section of the aluminum alloy for hydrogen production in Example 3 of the present application is shown;

[0023] Figure 4 A scanning diagram of the distribution of aluminum, sodium and chlorine elements in a cross section of an aluminum alloy for hydrogen production in Example 3 of the present application is shown;

[0024] Figure 5 A graph showing the hydrogen yield of the aluminum alloy used for hydrogen production by hydrolysis in Examples 1 to 4 of the present application is shown;

[0025] Figure 6 A graph showing the hydrogen production rate of the aluminum alloy hydrolyzed to produce hydrogen in Examples 1 to 4 of the present application is shown. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] As analyzed in the background technology of this application, the prior art has the problems that aluminum alloys have poor hydrogen production performance, high preparation costs, and are inconvenient to transport and store. In order to solve the above problems, this application provides an aluminum alloy for hydrogen production and a preparation method thereof.

[0028] In a typical embodiment of the present application, an aluminum alloy for hydrogen production is provided. The aluminum alloy for hydrogen production includes the following elements, in terms of mass percentage: 80-96% aluminum, 1.25-10% gallium, 2-18% indium and indium, and 0.1-5% water-soluble inorganic salts; wherein the water-soluble inorganic salts contain chlorine.

[0029] The present invention dopes the aluminum alloy for hydrogen production with a water-soluble inorganic salt containing chlorine. During the hydrolysis of the aluminum alloy for hydrogen production, the water-soluble inorganic salt dissolves to form a local high-concentration Cl - region, which is more conducive to destroying the oxide film formed on the Al grains, thereby promoting the hydrolysis reaction of the aluminum alloy for hydrogen production and improving the hydrogen yield of the aluminum alloy for hydrogen production. At the same time, under the condition of the same hydrogen yield, the doping of water-soluble inorganic salts can reduce the doping amount of precious metals gallium, indium, and indium, thereby reducing production costs. In addition, the aluminum alloy for hydrogen production of the present invention can be used for hydrogen production in a block form, which is not only convenient for transportation and storage, but also can simplify the preparation process and reduce energy consumption.

[0030] In order to further improve the hydrogen yield of the aluminum alloy for hydrogen production, in one embodiment of the present application, the aluminum alloy for hydrogen production includes the following elements, measured by mass percentage: 83-92% aluminum, 2-7% gallium, 3.5-13% indium and tin, and 1.5-5% water-soluble inorganic salts.

[0031] In one embodiment of the present application, the mass ratio of the water-soluble inorganic salt to aluminum is 0.015-0.055:1, preferably 0.02-0.05:1.

[0032] It is preferred to control the mass ratio of the water-soluble inorganic salt to aluminum within the above range, which helps the water-soluble inorganic salt to form a local high concentration of Cl after dissolving in water. - region, thereby helping to destroy the oxide film formed on the Al grains, thereby helping to improve the hydrogen yield of the aluminum alloy for hydrogen production, and helping to reduce the doping amount of precious metals gallium, indium, and indium, thereby helping to reduce production costs.

[0033] In one embodiment of the present application, the mass ratio of indium to tin is 0.2 to 3:1; and / or, indium and tin in the aluminum alloy for hydrogen production exist in the form of indium tin metal compounds, and / or, the indium tin metal compound is In3Sn and / or InSn4, preferably, the mass of In3Sn is 60 to 90% of the indium tin metal compound.

[0034] It is preferred to control the mass ratio of indium and tin within the above range, which is conducive to the formation of metal compounds In3Sn and InSn4. Further, controlling the mass content of In3Sn within the above range is more helpful to improve the hydrogen production performance of the aluminum alloy for hydrogen production.

[0035] In one embodiment of the present application, the water-soluble inorganic salt is NaCl and / or KCl.

[0036] It is preferred that the types of water-soluble inorganic salts are within the above range, which helps to form a local high concentration of Cl after the water-soluble inorganic salts are dissolved in water. - region, which is more conducive to destroying the oxide film formed on the Al grains, and thus helps to produce hydrogen using aluminum alloys.

[0037] In one embodiment of the present application, the aluminum alloy for hydrogen production is in block form, and / or the average size of the aluminum alloy for hydrogen production is centimeter level or above, preferably 1 to 5 centimeters.

[0038] It is preferred that the aluminum alloy for hydrogen production is in block form, and the size of the aluminum alloy for hydrogen production is controlled within the above range, which not only helps to facilitate transportation and storage, but also does not require excessive processing, thereby helping to simplify the preparation process and reduce energy consumption.

[0039] In another typical embodiment of the present application, a method for preparing the above-mentioned aluminum alloy for hydrogen production is provided, and the preparation method comprises: step S1, mixing and smelting raw materials corresponding to the above-mentioned aluminum alloy for hydrogen production to obtain a melt; and step S2, stirring and casting the melt to obtain the aluminum alloy for hydrogen production.

[0040] The present application can enhance the strengthening effect of the metal by controlling the composition of the aluminum alloy raw material for hydrogen production within the above-mentioned range. The addition of indium and tin can not only lower the melting point of the aluminum alloy for hydrogen production, thereby making the aluminum alloy for hydrogen production easy to melt and form, but also form metal compounds In3Sn and InSn4, which helps to improve the hydrogen production performance of the aluminum alloy for hydrogen production; the addition of water-soluble inorganic salts containing chlorine elements can not only destroy the oxide film on the Al grains during the hydrolysis of the aluminum alloy for hydrogen production, thereby promoting the hydrolysis of the aluminum alloy for hydrogen production, but also reduce the doping amount of precious metals such as gallium, indium, and indium; through stirring and casting, a block-shaped aluminum alloy for hydrogen production can be prepared, and its size and shape can be adjusted according to the mold during preparation.

[0041] In one embodiment of the present application, in the above step S1, the smelting temperature is 50 to 300°C higher than the melting point of the water-soluble inorganic salt; and / or the smelting temperature is 900 to 950°C; and / or the holding temperature of the smelting is 900 to 950°C, and / or the holding time of the smelting is 0.5 to 2h; and / or the smelting atmosphere is nitrogen and / or argon.

[0042] It is preferred to control the smelting temperature to be higher than the melting point of the water-soluble inorganic salt, and control the smelting temperature, the holding temperature, the holding time and the smelting atmosphere within the above range, which helps indium and tin to form metal compounds In3Sn and InSn4, and makes the Cl element of the water-soluble inorganic salt evenly distributed on the surface of the matrix of the aluminum alloy for hydrogen production.

[0043] In one embodiment of the present application, in the above step S2, the stirring speed is 500-1000 rpm, and / or the stirring time is 1-3 hours.

[0044] Controlling the stirring speed and time within the above range helps to homogenize the composition of the aluminum alloy for hydrogen production and improve fluidity, thereby facilitating subsequent casting and molding.

[0045] In one embodiment of the present application, in the above step S2, cooling is performed after casting, and the cooling is air cooling; and / or the casting temperature is 780-850°C.

[0046] It is preferred to control the casting temperature within the above range to facilitate solidification of the melt, and to cool the melt in the above manner after casting to facilitate molding of the melt to obtain a bulk aluminum alloy for hydrogen production.

[0047] The beneficial effects of the present application will be further illustrated below in conjunction with embodiments.

[0048] The elemental composition of the aluminum alloy for hydrogen production in the embodiments and comparative examples of the present invention is shown in Table 1. The preparation method of the aluminum alloy for hydrogen production includes: preparing ingredients according to the raw materials corresponding to the aluminum alloy for hydrogen production in Table 1, smelting the prepared metal in a high-temperature furnace under nitrogen protection to obtain a melt, wherein the smelting temperature is 900°C, the smelting insulation temperature is 900°C, and the smelting insulation time is 1h. The melt is stirred and cast, cooled under natural conditions after casting, and packaged after cooling to obtain an aluminum alloy for hydrogen production with an average size of 2 cm. The aluminum alloy for hydrogen production is a block material, wherein the stirring speed is 500rpm, and / or the stirring time is 3h, and the casting temperature is 780°C.

[0049] Table 1

[0050]

[0051] Example 5

[0052] The difference from Example 1 is that the raw materials corresponding to the aluminum alloy for hydrogen production are batched, and the batched metal is placed in a high-temperature furnace under nitrogen protection for smelting to obtain a melt, wherein the smelting temperature is 950°C, the smelting insulation temperature is 950°C, and the smelting insulation time is 0.5h. The melt is stirred and cast, and after casting, it is cooled under natural conditions, and after cooling, it is packaged to obtain an aluminum alloy for hydrogen production with an average size of 1 cm, and the aluminum alloy for hydrogen production is a block material, wherein the stirring speed is 1000rpm, and / or the stirring time is 1h, and the casting temperature is 780°C.

[0053] Example 6

[0054] The difference from Example 1 is that the raw materials corresponding to the aluminum alloy for hydrogen production are batched, and the batched metals are placed in a high-temperature furnace under nitrogen protection for smelting to obtain a melt, wherein the smelting temperature is 925°C, the smelting insulation temperature is 925°C, and the smelting insulation time is 2h. The melt is stirred and cast, and after casting, it is cooled under natural conditions, and after cooling, it is packaged to obtain an aluminum alloy for hydrogen production with an average size of 5 cm, and the aluminum alloy for hydrogen production is a block material, wherein the stirring speed is 700rpm, and / or the stirring time is 2h, and the casting temperature is 850°C.

[0055] Example 7

[0056] The difference from Example 1 is that the total mass of aluminum and NaCl is 18.3 g, the mass ratio of NaCl to aluminum is 0.02:1, and finally an aluminum alloy for hydrogen production is obtained.

[0057] Example 8

[0058] The difference from Example 1 is that the total mass of aluminum and NaCl is 18.3 g, the mass ratio of NaCl to aluminum is 0.05:1, and finally an aluminum alloy for hydrogen production is obtained.

[0059] Example 9

[0060] The difference from Example 1 is that the total mass of aluminum and NaCl is 18.3 g, the mass ratio of NaCl to aluminum is 0.01:1, and finally an aluminum alloy for hydrogen production is obtained.

[0061] Example 10

[0062] The difference from Example 1 is that the sum of the masses of indium and tin is 1.2 g, the mass ratio of indium to tin is 0.2:1, and finally an aluminum alloy for hydrogen production is obtained.

[0063] Embodiment 11

[0064] The difference from Example 1 is that the sum of the masses of indium and tin is 1.2 g, the mass ratio of indium to tin is 3:1, and finally an aluminum alloy for hydrogen production is obtained.

[0065] Example 12

[0066] The difference from Example 1 is that the sum of the masses of indium and tin is 1.2 g, the mass ratio of indium to tin is 4:1, and finally an aluminum alloy for hydrogen production is obtained.

[0067] Embodiment 13

[0068] The difference from Example 1 is that indium and tin in the aluminum alloy for hydrogen production exist in the form of indium tin metal compounds, the mass of the metal compound In3Sn is 60% of the indium tin metal compound, and finally the aluminum alloy for hydrogen production is obtained.

[0069] Embodiment 14

[0070] The difference from Example 1 is that indium and tin in the aluminum alloy for hydrogen production exist in the form of indium tin metal compounds, the mass of the metal compound In3Sn is 90% of the indium tin metal compound, and finally the aluminum alloy for hydrogen production is obtained.

[0071] Embodiment 15

[0072] The difference from Example 1 is that indium and tin in the aluminum alloy for hydrogen production exist in the form of indium tin metal compounds, the mass of the metal compound In3Sn is 50% of the indium tin metal compound, and finally the aluminum alloy for hydrogen production is obtained.

[0073] Example 16

[0074] The difference from Example 1 is that the melting temperature is 950° C., the melting holding temperature is 950° C., and finally an aluminum alloy for hydrogen production is obtained.

[0075] Embodiment 17

[0076] The difference from Example 1 is that the smelting temperature is 1000° C., the smelting insulation temperature is 1000° C., and finally an aluminum alloy for hydrogen production is obtained.

[0077] Test Method

[0078] The aluminum alloys for hydrogen production in the embodiments and comparative examples were subjected to hydrolysis reaction in water at 40° C., the hydrogen production performance was tested, and microscopic characterization was performed. The test results are shown in Table 2.

[0079] Table 2

[0080]

[0081]

[0082] It can be seen from the data in Table 1 and Table 2 that the data in Example 1 and Comparative Example 1 show that the addition of a proper amount of water-soluble inorganic salt NaCl in Example 1 can achieve the same hydrogen yield, and effectively reduce the total usage of precious metals indium and tin by 20% on the basis of Comparative Example 1; the data in Example 2 and Comparative Example 2 show that when Al has the same mass ratio with precious metals gallium, indium and tin, the addition of a proper amount of water-soluble inorganic salt in Example 2 can effectively improve the hydrogen yield of the alloy for hydrogen production.

[0083] in, Figure 1 is an optical photograph of the aluminum alloy for hydrogen production in Examples 1 to 4, from Figure 1 It can be seen that the shape of the aluminum alloy for hydrogen production is block-like.

[0084] Figure 2 is the X-ray analysis diagram of the aluminum alloy for hydrogen production in Examples 1 to 4. Figure 2 It can be seen that the aluminum alloy used for hydrogen production contains one or both of the metal compounds In3Sn and InSn4 formed by indium and tin.

[0085] Figure 3 is a microscopic morphology of the cross section of the aluminum alloy for hydrogen production in Example 3. Figure 3 It can be seen that the morphology of the cross-section of the aluminum alloy for hydrogen production is mainly a gray-dark matrix and bright-colored irregular particles.

[0086] Figure 4 is a scanning diagram of the distribution of aluminum, sodium and chlorine elements in the cross section of the aluminum alloy for hydrogen production in Example 3. Figure 4 It can be seen that the Cl element is scattered on the surface of the matrix of the aluminum alloy for hydrogen production.

[0087] Figure 5 is a graph showing the hydrogen yield of the aluminum alloy used for hydrogen production in Examples 1 to 4. Figure 5 It can be seen that the hydrogen yield of the aluminum alloy for hydrogen production in Examples 1 to 4 is relatively high. Calculation shows that the hydrogen yield is as high as 83.33% or more, and the highest reaches 100%.

[0088] Figure 6 is a graph of the hydrogen production rate of the aluminum alloy hydrolyzed to produce hydrogen in Examples 1 to 4, from Figure 6 It can be seen that the hydrogen production rate of the aluminum alloy hydrolysis for hydrogen production in Example 3 is relatively high. Calculation shows that the maximum hydrogen production rate of Example 3 reaches 0.104L / (min~g).

[0089] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0090] The present invention dopes the aluminum alloy for hydrogen production with a water-soluble inorganic salt containing chlorine. During the hydrolysis of the aluminum alloy for hydrogen production, the water-soluble inorganic salt dissolves to form a local high-concentration Cl - region, which is more conducive to destroying the oxide film formed on the Al grains, thereby promoting the hydrolysis reaction of the aluminum alloy for hydrogen production and improving the hydrogen yield of the aluminum alloy for hydrogen production. At the same time, under the condition of the same hydrogen yield, the doping of water-soluble inorganic salts can reduce the doping amount of precious metals gallium, indium, and indium, thereby reducing production costs. In addition, the aluminum alloy for hydrogen production of the present invention can be used for hydrogen production in a block form, which is not only convenient for transportation and storage, but also can simplify the preparation process and reduce energy consumption.

[0091] The above are only embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An aluminum alloy for hydrogen production, characterized in that: In terms of mass percentage, the aluminum alloy for hydrogen production includes the following elements: 80-96% aluminum, 1.25-10% gallium, 2-18% indium and tin, and 0.1-5% water-soluble inorganic salt; wherein the water-soluble inorganic salt contains chlorine.

2. The aluminum alloy for hydrogen production according to claim 1, characterized in that: In terms of mass percentage, the aluminum alloy for hydrogen production includes the following elements: 83-92% aluminum, 2-7% gallium, 3.5-13% indium and tin, and 1.5-5% water-soluble inorganic salt.

3. The aluminum alloy for hydrogen production according to claim 1 or 2, characterized in that: The mass ratio of the water-soluble inorganic salt to the aluminum is 0.015 to 0.055:1, preferably 0.02 to 0.05:

1.

4. The aluminum alloy for hydrogen production according to any one of claims 1 to 3, characterized in that: The mass ratio of the indium to the tin is 0.2 to 3:1; and / or, the indium and the tin in the aluminum alloy for hydrogen production exist in the form of indium tin metal compounds, and / or, the indium tin metal compound is In3Sn and / or InSn4, and preferably the mass of the In3Sn is 60 to 90% of the indium tin metal compound.

5. The aluminum alloy for hydrogen production according to any one of claims 1 to 4, characterized in that: The water-soluble inorganic salt is NaCl and / or KCl.

6. The aluminum alloy for hydrogen production according to any one of claims 1 to 5, characterized in that: The aluminum alloy for hydrogen production is in block shape, and / or the average size of the aluminum alloy for hydrogen production is centimeter-level or above, preferably 1 to 5 centimeters.

7. A method for preparing the aluminum alloy for hydrogen production according to any one of claims 1 to 6, characterized in that: The preparation method comprises: Step S1, preparing and smelting raw materials corresponding to the aluminum alloy for hydrogen production according to any one of claims 1 to 6 to obtain a melt; and Step S2, stirring and casting the melt to obtain the aluminum alloy for hydrogen production.

8. The preparation method according to claim 7, characterized in that: In the step S1, the smelting temperature is 50 to 300°C higher than the melting point of the water-soluble inorganic salt; and / or the smelting temperature is 900 to 950°C; and / or the holding temperature of the smelting is 900 to 950°C, and / or the holding time of the smelting is 0.5 to 2h; and / or the smelting atmosphere is nitrogen and / or argon.

9. The preparation method according to claim 7 or 8, characterized in that: In the step S2, the stirring speed is 500-1000 rpm, and / or the stirring time is 1-3 hours.

10. The preparation method according to any one of claims 7 to 9, characterized in that: In the step S2, cooling is performed after the casting, and the cooling is air cooling; and / or the casting temperature is 780-850°C.

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