WO2012041247A1 - 一种镁合金燃料电池的阳极及其制备方法 - Google Patents

一种镁合金燃料电池的阳极及其制备方法 Download PDF

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WO2012041247A1
WO2012041247A1 PCT/CN2011/080407 CN2011080407W WO2012041247A1 WO 2012041247 A1 WO2012041247 A1 WO 2012041247A1 CN 2011080407 W CN2011080407 W CN 2011080407W WO 2012041247 A1 WO2012041247 A1 WO 2012041247A1
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magnesium alloy
anode
fuel cell
magnesium
weight percentage
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PCT/CN2011/080407
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English (en)
French (fr)
Inventor
马润芝
石辉
施建
张学国
程炳烨
Original Assignee
Ma Runzhi
Shi Hui
Shi Jian
Zhang Xueguo
Cheng Bingye
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Application filed by Ma Runzhi, Shi Hui, Shi Jian, Zhang Xueguo, Cheng Bingye filed Critical Ma Runzhi
Publication of WO2012041247A1 publication Critical patent/WO2012041247A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/90—Selection of catalytic material
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M2008/1095—Fuel cells with polymeric electrolytes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Definitions

  • the present invention relates to an anode for a fuel cell, and more particularly to an anode of a magnesium alloy fuel cell and a method of preparing the same.
  • a fuel cell is a new type of battery that converts chemical energy directly into electrical energy and thermal energy. It differs from conventional batteries in that there is continuous power output as long as there is fuel and oxidant supply. It has the advantages of high energy conversion efficiency, no pollution, fast startup, long battery life, specific power, high specific energy, etc., and has advantages in fixed power generation systems, field power sources, distributed power sources, space aircraft power supplies, and vehicle power sources. Broad application prospects. Compared with traditional batteries, fuel cells are at least 10 times more energy efficient.
  • fuel cells mainly include alkaline fuel cell brick acid fuel cells, molten carbonate fuel cells, solid oxide secondary fuel cells, proton exchange membrane fuel cells, direct methanol fuel cells, etc., regardless of the fuel cell, its structure It must necessarily include an anode, a cathode, and an electrolyte located between the anode and the cathode.
  • the anode materials are mainly used in the following types:
  • Hydrogen-oxygen fuel cell the anode material of the battery is hydrogen (H 2 ). Hydrogen fuel has certain safety hazards in terms of use, transportation and storage. Moreover, the cost of manufacturing hydrogen into electrode materials is very high, and the storage price and the manufacturing cost of the catalytic electrode are also very high.
  • the zinc-air fuel cell, the battery uses zinc-based metal (zinc alloy) as the anode, the zinc alloy anode and the water molecules in the air are prone to oxidation and deliquescence, and it is easy to form carbonate compounds by combining with carbon dioxide in the air. Affecting the performance of the metal anode, so the zinc alloy anode can not be stored for a long time; and ⁇ by, ⁇ by, 3 ⁇ 4 ⁇ ⁇ ⁇ ⁇ , & ⁇ it tt AY ⁇ 7-; ⁇ 3 ⁇ 4 . ⁇ C il : ⁇ 3 ⁇ 4il ⁇ by, The anodic corrosion and catalytic effect of the zinc alloy in the pool, however, the alkaline hydrate solution is very harmful to both humans and the environment.
  • zinc-based metal zinc-based metal
  • a magnesium alloy fuel cell which is a "modified aluminum, magnesium alloy fuel cell” provided by the applicant in the patent application No. 200710073300. 2, using a magnesium-based metal (magnesium alloy) as an anode, having energy Produces strong current, high conductivity, long duration, high efficiency, and no pollution.
  • a magnesium-based metal magnesium alloy
  • the applicant has only provided the composition of the anode catalytic electrode of the magnesium alloy fuel cell and the preparation method thereof in the patent application No. 200710073290.
  • the magnesium alloy prepared by the prior art has the disadvantages of segregation, uneven microstructure of the magnesium alloy, coarse grain, etc., resulting in short life and low efficiency of the fuel cell, that is, the high performance magnesium alloy fuel cell is difficult to be Promote applications in the market.
  • the present invention provides an anode of a magnesium alloy fuel cell and a preparation method thereof, which have high anode electrochemical conversion rate and high utilization ratio, no segregation of anode, uniform anode structure, small crystal grain, and improved fuel cell performance.
  • An anode of a magnesium alloy fuel cell is composed of a magnesium alloy, characterized in that the magnesium alloy is composed of magnesium, aluminum, lithium, zinc, The content of the magnesium alloy is 80. 0-86. 0% by weight of the magnesium alloy.
  • the weight percentage of each component of the magnesium alloy is:
  • the purity of the magnesium is greater than 99. 8 ° /. .
  • the anode surface is provided with a passivation film of 2_5 ⁇ m.
  • the rare earth metal comprises barium, calcium, strontium, barium, strontium, and titanium.
  • the invention also provides a method for preparing an anode of a magnesium alloy fuel cell, the method comprising the following steps:
  • the 5%, the weight percentage is 3. 1-7. 6 ° /, the weight percentage is 80. 0-86. 0% magnesium, the weight percentage is 3. 1-7. 6 ° /.
  • the 5% by weight of the manganese, the weight percentage is 3. 5-9. 2% of the lithium, the weight percentage is 0. 8-2. 0% of the zinc, the weight percentage is 0. 2-1. 5% of the manganese dioxide and the weight percentage is 0. 5-5. 0. /.
  • the rare earth metals are mixed and smelted together to form a magnesium alloy melt;
  • the smelted magnesium alloy melt is solidified by a special mold, and is kept at a temperature ranging from 573 to 584 K for 1 hour, and then cooled at room temperature to prepare a magnesium alloy billet;
  • the surface of the solidified magnesium alloy billet is subjected to a resection process to form a magnesium alloy
  • magnesium alloy When the magnesium alloy is heated to 473K-493K, the magnesium alloy is used in an extruder of 800-1600 tons. Extruded into a flat or round tubular anode.
  • the step D is followed by the step E: the magnesium alloy anode after extrusion is formed into a passivation film of 2-5 ⁇ m by the gas phase quenching technique.
  • the invention has the advantages of overcoming the defects that the magnesium alloy prepared by the prior art is prone to segregation, uneven structure of the magnesium alloy, coarse grains, etc., and the ability of the anode to be uniformly corroded when using the discharge is improved, and the magnesium alloy structure is increased.
  • the compactness increases the mass-to-mass ratio energy and volumetric energy of the overall fuel cell.
  • the electrochemical conversion rate and utilization rate of the anode are also improved, and the overall stability and reliability of the fuel cell are improved in the case of high current and rate discharge.
  • the smelted magnesium alloy melt is solidified by a special mold, and is kept at a temperature ranging from 573 to 584 Torr for 1 hour, and then cooled at room temperature to form a magnesium alloy billet;
  • the surface of the solidified magnesium alloy billet is subjected to a resection process to form a magnesium alloy to remove the oxide component of the surface to ensure the purity of the magnesium alloy;
  • the magnesium alloy is heated to 473K-493K, the magnesium alloy is extruded into a flat plate by using an extrusion device of 800-1600 tons, thereby preparing an anode of the magnesium alloy fuel cell;
  • the anode of the extruded flat plate is formed by a gas phase quenching technique to form a passivation film of 3-6 m on the surface, thereby completing the preparation of the anode.
  • the specific preparation method of the anode is as follows:
  • the anode of the magnesium alloy fuel cell of the present invention is composed of a magnesium alloy and trace impurities, the magnesium alloy It is composed of magnesium, aluminum, lithium, zinc, manganese dioxide and rare earth metal.
  • the optimum ratio (weight percentage) of each component of the magnesium alloy is:
  • the purity of the magnesium is greater than 99. 8 ° /.
  • a passivation film of 4 ⁇ m is present on the surface of the anode, and the rare earth metal in the anode contains one or a mixture of two or more of barium, calcium, strontium, barium, strontium, and titanium.
  • the anode was prepared in accordance with the above method, and the passivation film thickness of the anode surface was 4 ⁇ m.
  • the anode of the magnesium alloy fuel cell of the present invention is composed of a magnesium alloy and a trace impurity, and the magnesium alloy is composed of magnesium, aluminum, lithium, zinc, manganese dioxide or rare earth metal.
  • the magnesium alloy is each group The best ratio (weight percentage) of the points is:
  • the purity of the magnesium is greater than 99. 8 ° /.
  • a passivation film of 4 ⁇ m is present on the surface of the anode, and the rare earth metal in the anode contains one or a mixture of two or more of barium, calcium, strontium, barium, strontium, and titanium. According to the above The anode was prepared by the method. The passivation film thickness of the anode surface was 3 ⁇ m.
  • the anode of the magnesium alloy fuel cell of the present invention is composed of a magnesium alloy and a trace impurity, and the magnesium alloy is composed of magnesium, aluminum, lithium, zinc, manganese dioxide or rare earth metal.
  • the magnesium alloy is each group The best ratio (weight percentage) of the points is:
  • the purity of the magnesium is greater than 99. 8 ° /.
  • a passivation film of 4 ⁇ m is present on the surface of the anode, and the rare earth metal in the anode contains one or a mixture of two or more of barium, calcium, strontium, barium, strontium, and titanium.
  • the anode was prepared in accordance with the above method.
  • the passivation film thickness of the anode surface was 6 ⁇ m.
  • the prepared anode is installed in a fuel cell, and the neutral electrolyte (saline NaCl) and the air electrode are used to generate electric energy, as provided by the applicant in the patent application No. 20071 0073300.
  • the surface of the magnesium alloy blank after solidification molding is cut to ensure the purity of the magnesium alloy, thereby ensuring that the prepared anode can sufficiently occur with the electrolyte and the air electrode.
  • Chemical reaction improving the electrochemical conversion rate and utilization rate of the anode;
  • the temperature is controlled between 473K and 493K, which can make the lattice distribution of the magnesium alloy after extrusion plastic deformation uniform, and the grain diameter can be effectively controlled between 5-18 m, while the traditional
  • the magnesium alloy produced by the casting method has a grain size of about 100 m, thereby improving the ability of the prepared anode to uniformly corrode when using a discharge in a fuel cell, increasing the compactness of the magnesium alloy structure, and improving the overall fuel cell.
  • the mass-to-mass ratio and energy-to-volume ratio energy extend the service life of the fuel cell; and effectively improve the strength and toughness of the prepared anode, thereby reducing the self-corrosion rate of the anode and increasing the service life of the anode;
  • the 3-6 m passivation film on the surface of magnesium alloy has strong oxidation resistance. Therefore, the prepared anode has almost no side reaction during storage, so there is no oxidation or deliquescence during storage. Therefore, the anode of the present embodiment is stored for a particularly long period of time, effectively extending the service life of the fuel cell.
  • the invention carries out an experiment for assembling a magnesium alloy fuel cell.
  • the fuel cell adopts the anode prepared by the embodiment, and the performances are good during the test, and the indexes are obviously higher than the zinc-air fuel cell and the same specification of the same specification. Magnesium-air fuel cell.
  • the experimental results show that the anode of the invention achieves high electrochemical conversion rate and high utilization rate, no segregation, uniform microstructure of the magnesium alloy, small crystal grains, and obvious effect of improving fuel cell efficiency.

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  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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Description

一种镁合金燃料电池的阳极及其制备方法
技术领域
本发明涉及一种燃料电池的阳极， 尤其涉及一种镁合金燃料电池的阳极及 其制备方法。
背景技术
燃料电池是将化学能直接转换为电能和热能的新型电池， 其与常规电池的 不同之处在于， 只要有燃料和氧化剂供给， 就会有持续不断的电力输出。 它因 具有能量转换效率高、 无污染、 启动快、 电池寿命长、 比功率、 比能量高等优 点， 而在固定发电系统、 现场用电源、 分布式电源、 空间飞行器电源及交通工 具用电源方面有广阔的应用前景。 而与传统电池相比， 燃料电池的能量至少要 高 1 0倍。 目前燃料电池主要包括碱性燃料电池磚酸燃料电池、 熔融碳酸盐燃料 电池、 固态氧化次燃料电池、 质子交换膜燃料电池、 直接曱醇燃料电池等， 不 管何种燃料电池， 其结构中都必然包括阳极、 阴极和位于阳极和阴极之间的电 解质。
现有技术中， 阳极材料主要采用以下几种：
一、 氢-氧燃料电池， 电池的阳极材料是氢（H2 )。 氢燃料在使用、 运输、储 存方面存在一定安全隐患， 而且， 把氢气制造成电极材料的成本非常高， 其贮 存价格、 催化电极的制造价格也非常的高昂。
二、 锌-空燃料电池， 电池采用锌基金属（锌合金）作为阳极， 锌合金阳极 与空气中的水分子容易产生氧化、 潮解现象， 而且与空气中的二氧化碳化合容 易生成碳酸盐化合物， 影响金属阳极性能， 所以锌合金阳极不能长期存放； 而 曰由, Φ 由, ¾ Ά ^ ^ ί,& ^ it tt AY ^ 7-；^¾ . 丕 C il : ^ ¾il ^ 由, 池中的锌合金阳极腐蚀、 催化的效果， 然而， 碱性的氢氧化合物溶液无论是对 人还是环境都有很大的危害。
三、 其它燃料供电系统（例如： 质子交换膜燃料电池、 碱性燃料电池、 磷 酸燃料电池、 熔融碳酸盐燃料电池、 固体氧化物燃料电池）： 其与氢-氧燃料电 池的阳极材料的性质、 制造、 使用基本上接近。
四、 镁合金燃料电池， 是本申请人在申请号为 200710073300. 2的专利申请 中提供的一种 "改性铝、 镁合金燃料电池"， 采用镁基金属（镁合金）作为阳极, 具有能产生较强的电流、 导电率高、 持续时间长、 效率高、 无污染的优点。 然 而， 本申请人在申请号为 200710073290. 2的专利申请中只提供了镁合金燃料电 池的阳极催化电极的组份及其制备方法， 并没有提供适合燃料电池用的镁合金 阳极的组份及其制备方法， 然而， 以现有技术制备的镁合金存在着偏析、 镁合 金组织不均匀、 晶粒粗大等不足， 导致燃料电池寿命短、 效能低， 即高性能的 镁合金燃料电池还难以在市场上推广应用。
发明内容
本发明为了解决上述问题， 提供了一种阳极电化学转换率和利用率高， 阳 极不偏析、 阳极组织均匀、 晶粒小， 可提高燃料电池效能的镁合金燃料电池的 阳极及其制备方法。
为了达到上述目的， 本发明采用的技术方案如下： 一种镁合金燃料电池的 阳极， 所述燃料电池的阳极由镁合金组成， 其特征在于， 所述镁合金由镁、 铝， 锂、 锌、 二氧化锰、 稀土金属组成， 所述镁合金各组分的重量百分比含量为： 镁 80. 0-86. 0%
铝 3. 1-7. 6%
锂 3. 5-9. 2% 锌 0. 8-2. 0%
二氧化锰 0. 2-1. 5%
稀土金属 0. 5-5. 0%。
较优选的， 所述镁合金各组分的重量百分比含量为：
镁 84. 6%
铝 6. 5%
锂 3. 6%
锌 1. 5%
二氧化锰 1. 0%
稀土金属 2. 8%。
较优选的， 所述镁的纯度大于 99. 8°/。。
较优选的， 所述阳极表面设有 2_5μπι的钝化膜。
较优选的， 所述的稀土金属包含有锶、 钙、 钡、 铋、 锑、 钛。
本发明还提供了镁合金燃料电池的阳极的制备方法， 该方法包括如下步骤：
Α、 先将镁金属原料精炼提纯达 99. 8%以上后， 再将重量百分比为 80. 0-86. 0%的镁、 重量百分比为 3. 1-7. 6°/。的铝、 重量百分比为 3. 5-9. 2%的锂、 重量百分比为 0. 8-2. 0%的锌、 重量百分比为 0. 2-1. 5%的二氧化锰以及重量百分 比为 0. 5-5. 0。/。的稀土金属一起混合冶炼， 制成镁合金熔液；
B、 将冶炼后的镁合金熔液通过专用模具固化成型， 并在 573-584K的温 度范围之间保温 1小时后再进行室温冷却， 制成镁合金坯料；
C、 将固化成型后的镁合金坯料的表面 3-6匪进行切除加工处理， 制成镁 合金；
D、 将镁合金加热至 473K-493K时， 使用 800-1600吨的挤压机将镁合金 挤压成平板状或圆管状阳极。
较优选的， 所述步骤 D后还有步骤 E: 将挤压成型后的镁合金阳极， 利用气 相急冷技术， 使其表面形成 2-5μπι的钝化膜。
本发明的贡献在于， 克服了以现有技术制备的镁合金容易出现偏析、 镁合金 组织不均、 晶粒粗大等不足， 改善了阳极在使用放电时能够均匀腐蚀的能力， 增 加了镁合金组织的致密性， 提高整体燃料电池的质量比能量和体积比能量。 还提 高了阳极的电化学转换率和利用率， 而且在大电流和倍率放电的情况下， 提高了 燃料电池的整体稳定性和可靠性。
具体实施方式
下列实施例是对本发明的进一步解释和说明， 对本发明不构成任何限制。 Α、 先将镁金属原料精炼提纯达 99. 8%以上后，将各组分按比例一起冶炼， 制成镁合金熔液；
Β、 将冶炼后的镁合金熔液通过专用模具固化成型， 并在 573-584Κ的温 度范围之间保温 1小时后再进行室温冷却， 制成镁合金坯料；
C、 将固化成型后的镁合金坯料的表面 5匪进行切除加工处理， 制成镁合 金， 以去除表面的氧化物成份， 保证镁合金的纯度；
D、 将镁合金加热至 473K-493K时， 使用 800-1600吨的挤压设备将镁合 金挤压成平板状， 从而制成镁合金燃料电池的阳极；
E、 将挤压成型后的平板状阳极，利用气相急冷技术，使其表面形成 3-6 m 的钝化膜， 即可完成阳极的制备。
实施例 1
该阳极的具体制备方法如下：
本发明的镁合金燃料电池的阳极是由镁合金及微量杂质组成， 所述镁合金 由镁、 铝、 锂、 锌、 二氧化锰、 稀土金属组成， 本实施例中， 所述镁合金各组 分的最佳配比 （重量百分比含量） 为：
84. 6%
6. 5%
3. 6%
1. 5%
二氧化锰 1. 0%
稀土金属 2. 8%。
上述的镁的纯度大于 99. 8°/。， 阳极的表面存在有 4μπι的钝化膜， 阳极中的稀 土金属包含有锶、 钙、 钡、 铋、 锑、 钛中的一种或两种以上混合。 按照上述方 法制备阳极， 阳极表面的钝化膜厚度为 4μπι。
实施例 2
本发明的镁合金燃料电池的阳极是由镁合金及微量杂质组成， 所述镁合金 由镁、 铝、 锂、 锌、 二氧化锰、 稀土金属组成， 本实施例中， 所述镁合金各组 分的最佳配比 （重量百分比含量） 为：
镁
Figure imgf000006_0001
铝 7. 6%
锂 9. 2%
锌 1. 0%
二氧化锰 1. 0%
稀土金属 1. 2%
上述的镁的纯度大于 99. 8°/。， 阳极的表面存在有 4μπι的钝化膜， 阳极中的稀 土金属包含有锶、 钙、 钡、 铋、 锑、 钛中的一种或两种以上混合。 按照上述方 法制备阳极。 阳极表面的钝化膜厚度为 3μπι。
实施例 3
本发明的镁合金燃料电池的阳极是由镁合金及微量杂质组成， 所述镁合金 由镁、 铝、 锂、 锌、 二氧化锰、 稀土金属组成， 本实施例中， 所述镁合金各组 分的最佳配比 （重量百分比含量） 为：
镁 86%
铝 3. 1%
锂 3. 5%
锌 1. 0%
二氧化锰 1. 5%
稀土金属 4. 9%。
上述的镁的纯度大于 99. 8°/。， 阳极的表面存在有 4μπι的钝化膜， 阳极中的稀 土金属包含有锶、 钙、 钡、 铋、 锑、 钛中的一种或两种以上混合。 按照上述方 法制备阳极。 阳极表面的钝化膜厚度为 6μπι。
把制备完成的阳极， 安装到燃料电池中， 再配合中性电解液（盐水 NaCl )、 空气电极即可产生电能， 如本申请人在申请号为 20071 0073300. 2的专利申请中 提供的一种 "改性铝、 镁合金燃料电池" 的结构。
由于镁合金的化学性质比锌活泼得多， 若采用传统工艺的镁合金作为燃料电 池的阳极， 虽然能产生较强的电流， 但是， 也存在着较大的不稳定性， 容易发生 倍率放电的情况下， 仍然能够保持电池的整体稳定性和可靠性。
在本实施例中， 对固化成型后的镁合金坯料表面进行切除加工， 保证了镁 合金的纯度， 从而保证了制备完成的阳极能够与电解液、 空气电极充分地发生 化学反应， 提高阳极的电化学转换率和利用率；
挤压镁合金时， 将温度控制在 473K-493K之间， 可使挤压塑性变形后的镁 合金的晶格分布均勾， 晶粒直径可有效控制在 5-18 m之间， 而传统的铸造方法 生产出来的镁合金的晶粒尺寸在 l OO m左右， 从而改善了制备完成的阳极在燃 料电池中使用放电时能够均匀腐蚀的能力， 增加了镁合金组织的致密性， 提高 整体燃料电池的质量比能量和体积比能量， 延长了燃料电池的使用寿命； 并有 效提高制备完成的阳极的强度和韧性， 从而降低了阳极的自腐蚀速率， 提高了 阳极的使用寿命；
镁合金表面的 3-6 m钝化膜， 有很强的抗氧化性， 因此， 制备完成的阳极 在贮存过程中基本上没有副反应产生， 所以在贮存过程中不会出现氧化、 潮解 的现象， 所以本实施例的阳极贮存的时间特别长， 有效延长了燃料电池的使用 寿命。
本发明进行了组装镁合金燃料电池的实验， 燃料电池采用了本实施例制备 完成的阳极， 在测试过程中， 各项性能良好， 各项指标明显高于相同规格的锌- 空燃料电池和传统的镁-空燃料电池。 实验结果表明， 本发明的阳极达到了电化 学转换率和利用率高， 不偏析、 镁合金组织均匀、 晶粒小， 明显提高燃料电池 效能的效果。
以上所述的实施例， 只是本发明较优选的具体实施方式的一种， 所以本领 域技术人员在本发明方案范围内进行的通常变化和替换都应包含在本发明的保 护范围内。

Claims

权 利 要 求 书
、 一种镁合金燃料电池的阳极，所述燃料电池的阳极为镁合金，其特征在于， 所述镁合金由镁、 铝、 锂、 锌、 二氧化锰、 稀土金属组成， 所述镁合金各 组分的重量百分比含量为：
镁 80. 0-86. 0%
铝 3. 1-7. 6%
锂 3. 5-9. 2%
锌 0. 8-2. 0%
二氧化锰 0. 2-1. 5%
稀土金属 0. 5-5. 0%。
、 如权利要求 1所述的一种镁合金燃料电池的阳极， 其特征在于， 所述镁合 金各组分的重量百分比含量为：
镁 84. 6%
铝 6. 5%
锂 3. 6%
锌 1. 5%
二氧化锰 1. 0%
稀土金属 2. 8%。
、 如权利要求 1所述的一种镁合金燃料电池的阳极， 其特征在于， 镁的纯度 大于 99. 8°/。。
、 如权利要求 1所述的一种镁合金燃料电池的阳极， 其特征在于， 所述镁合 金表面设有 2_5μπι的钝化膜。
、 如权利要求 1-4任一项所述的一种镁合金燃料电池的阳极， 其特征在于， 所述的稀土金属包含有锶、钙、钡、 铋、 锑、 钛中的一种或两种以上混合。 权 利 要 求 书
6、 一种如权利要求 1所述的阳极的制备方法， 其特征在于， 包括如下步骤：
A、 先将镁金属原料精炼提纯达 99. 8%以上后，再将重量百分比为 80. 0-86. 0% 的镁、 重量百分比为 3. 1-7. 6°/。的铝、 重量百分比为 3. 5-9. 2°/。的锂、 重 量百分比为 0. 8-2. 0°/。的锌、 重量百分比为 0. 2-1. 5°/。的二氧化锰以及重 量百分比为 0. 5-5. 0%的稀土金属一起混合冶炼， 制成镁合金熔液；
B、 将冶炼后的镁合金熔液通过专用模具固化成型， 并在 573-584K的温度范 围之间保温 1小时后再进行室温冷却， 制成镁合金坯料；
C、 8将固化成型后的镁合金坯料的表面 3-6匪进行切除加工处理， 制成镁合 金；
D、 将镁合金阳极加热至 473K-493K时， 使用 800-1600吨的挤压机将镁合金 挤压成平板状或圆管状阳极。
7、 如权利要求 6所述的阳极的制备方法， 其特征在于， 步骤 D后还有如下步 骤：
E、 将挤压成型后的镁合金阳极， 利用气相急冷技术， 使其表面形成 2-5 m 的钝化膜。
PCT/CN2011/080407 2010-09-30 2011-09-30 一种镁合金燃料电池的阳极及其制备方法 WO2012041247A1 (zh)

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