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Method for improving corrosion resistance performance of magnesium-based hydrogen storage alloy by using ion nitriding method

A magnesium-based hydrogen storage alloy, ion nitriding technology, applied in alkaline battery electrodes, metal material coating process, coating and other directions, can solve unseen, unreported problems, etc., to improve capacity or energy density, The effect of improved corrosion resistance and abundant resources

Inactive Publication Date: 2012-01-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the limitation of use, although there are research results of metal powder gas nitriding [CN93120039.3, "Journal of Materials Heat Treatment" 2008, Volume 29, No. 2, Page 40-42], there is no report on powder ion nitriding treatment method , the application of ion nitriding to the modification of hydrogen storage alloys has not been reported yet.

Method used

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  • Method for improving corrosion resistance performance of magnesium-based hydrogen storage alloy by using ion nitriding method
  • Method for improving corrosion resistance performance of magnesium-based hydrogen storage alloy by using ion nitriding method
  • Method for improving corrosion resistance performance of magnesium-based hydrogen storage alloy by using ion nitriding method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: Preparation of hydrogen storage alloy powder

[0027] Table 1Mg a R b Ni c co d Al e Composition examples of hydrogen storage alloys

[0028] Mg 2 Ni

[0029] According to the atomic ratio of the metal elements in the alloys in Table 1, weigh the corresponding metals and put them into the crucible. Put it in a tube furnace protected by argon, raise the temperature to 800°C under the protection of argon, keep it at 800°C for 2 hours and then cool to room temperature to obtain the corresponding bulk calcium-based or magnesium-based hydrogen storage materials. Broken by mechanical crushing method, the particles with a particle size of less than 2 mm were obtained by screening, placed in a stainless steel reactor, heated to 350 ° C, and vacuumed to a reactor pressure of 10 -3Below Torr, then hydrogenation is added and the pressure is increased to 40 atmospheres for hydrogenation. When the hydrogen pressure in the reactor no longer drops, the ...

Embodiment 2

[0030] Embodiment 2: Hydrogen storage alloy nitriding treatment

[0031] Select some alloys in Example 1 for nitriding treatment, take 100 grams of magnesium-based hydrogen storage alloy powder, grind it to 200 mesh to 400 mesh, place it on the cathode at the bottom of the ion nitriding furnace, and place the anode on the furnace top; Apply a DC voltage of 200-800 volts between the cathode and anode, and continuously stir the alloy powder placed at the bottom of the furnace at a stirring speed of 10-200rpm; control the heating rate at 1-10°C / min, and control the temperature of the alloy powder at 300 ~600℃, the treatment time is 0.2~2 hours. The boronizing treatment process conditions are listed in Table 2.

[0032] Table 2 Hydrogen Storage Alloy Nitriding Treatment Process Conditions

[0033] Magnesium base alloy

Embodiment 3

[0034] Embodiment 3: Evaluation of nitriding treatment effect

[0035] Get the magnesium-based alloy Mg in embodiment 2 1.9 La 0.1 Ni 0.7 co 0.2 Al 0.1 Powder, screened particle size 200 mesh to 400 mesh. Mg 1.9 La 0.1 Ni 0.7 co 0.2 Al 0.1 Powder, nickel powder, and PVA aqueous solution (5wt.%) were mixed at a mass ratio of 1:0.5:3 to form a slurry, which was applied to nickel foam, dried at room temperature, and pressed into shape as a comparative electrode.

[0036] figure 2 Mg before and after nitriding 1.9 La 0.1 Ni 0.7 co 0.2 Al 0.1 Compare the capacity fade behavior of the electrodes. It can be seen from the figure that the nitriding treatment greatly increased the Mg 1.9 La 0.1 Ni 0.7 co 0.2 Al 0.1 Electrode charge-discharge cycle stability.

[0037] The corrosion resistance of the magnesium-based alloy was evaluated by the charge-discharge capacity retention rate of 200 charge-discharge cycles. The higher the capacity retention rate, the better t...

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Abstract

The invention relates to an alloy modification technology, aiming at providing a method for improving the corrosion resistance performance of a magnesium-based hydrogen storage alloy by using an ion nitriding method. In the method, the ion nitriding treatment is carried out on the surface of the magnesium-based hydrogen storage alloy by adopting the ion nitriding method, and a compound containingnitrogen and hydrogen storage alloy is formed in the surface layer of the magnesium-based hydrogen storage alloy. The regional selectivity of the ion nitriding ensures that the nitriding treatment becomes targeted and the corrosion resistance performance of the magnesium-based hydrogen storage alloy in an alkaline solution is greatly improved. In addition, the alloy is unnecessary to be carried out activation treatment after the nitriding treatment, simple in production process and environment-friendly and capable of being produced in batch. The magnesium-based hydrogen storage alloy is low in cost compared with the traditional rare earth nickel hydrogen storage materials, is rich in resources and capable of greatly improving the capacity or the energy density of a battery while being applied to a nickel-metal hydride battery, greatly reducing the self-discharge while being applied to air battery and being made into a portable and mobile power supply for large-scale commercial application.

Description

technical field [0001] The invention relates to an alloy modification technology, in particular to a method for improving the corrosion resistance of a magnesium-based hydrogen storage alloy by ion nitriding. Background technique [0002] The hydrogen storage alloy stores hydrogen in the atomic state in the atomic space of the hydrogen storage alloy to form a metal hydride. Hydrogen storage alloys can be used as anode materials for nickel-hydrogen batteries or metal hydride-air batteries. The nickel-hydrogen battery uses nickel hydroxide as the positive electrode, hydrogen storage metal as the negative electrode, and lye (mainly KOH) as the electrolyte. Magnesium-based hydrogen storage alloys have the advantages of small specific gravity, high hydrogen storage capacity, low price, and abundant resources. However, magnesium-based hydrogen storage alloys are easily corroded in alkaline electrolytes and have poor charge-discharge cycle performance, which limits their applicati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/26H01M4/46C23C8/36
CPCY02E60/124Y02E60/10
Inventor 刘宾虹李洲鹏
Owner ZHEJIANG UNIV
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