A lead storage battery grid alloy containing nano-tungsten carbide material and its preparation method
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A tungsten carbide material, nano-tungsten carbide technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of unfavorable energy saving, easy generation of lead slag, weak anti-oxidation ability, etc., to save energy, reduce intergranular corrosion, The effect of increasing the grain boundary area
Active Publication Date: 2019-02-15
TIANNENG BATTERY GROUP
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The chemical properties of tungsten carbide are stable, active oxidation starts at above 500°C in the air, and the anti-oxidation ability is weak
[0007] In addition, the traditional lead-calcium-tin-aluminum alloy needs to be smelted above 650°C due to the addition of metal calcium, and lead slag is easily generated during the smelting process, which is not conducive to energy saving
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Embodiment 1
[0035] 1. Preparation of master alloy
[0036] The formula of the master alloy is as follows: tin: 5.0%, nanometer tungsten carbide 3.0%, lead as the balance, and the above ratios are all percentages by weight.
[0037] (1) according to above-mentioned proportioning, take metal tin, nano-tungsten carbide, lead;
[0038] (2) Add 2 / 3 of the raw material lead into the intermediate frequency smelting furnace and heat to 500°C to fully melt the lead pellets;
[0039] (3) Add metal tin to the melt, and stir at a low speed (magnetic or mechanical stirring) for 30 minutes, so that the metal tin is completely melted and mixed evenly;
[0040] (4) Cool down to 380°C, wrap the nano-tungsten carbide powder with the required mass ratio with lead skin, press it into the lead liquid, stir at a medium speed for 3 hours, so that the tungsten carbide powder is evenly dispersed in the lead liquid;
[0041] (5) Measure the composition of the master alloy, and cast the alloy ingot after reaching...
Embodiment 2
[0065] In terms of weight percentage, the composition is: 0.5% of tin, 0.5% of nano-tungsten carbide, and the balance of lead.
[0066] The preparation method and test method are the same as in Example 1, and the results are shown in Table 2.
[0067] Table 2
[0068]
[0069] The alloy formula of the above comparison 1 is a conventionally used grid alloy formula: 0.08% calcium, 1.0% tin, 0.05% aluminum, and the balance of lead.
Embodiment 3
[0071] In terms of weight percentage, the composition is: 0.5% of tin, 0.1% of nano-tungsten carbide, and the balance of lead.
[0072] The preparation method and test method are the same as in Example 1, and the results are shown in Table 3.
[0073] table 3
[0074]
[0075] The alloy formula of the above comparison 1 is a conventionally used grid alloy formula: 0.08% calcium, 1.0% tin, 0.05% aluminum, and the balance of lead.
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Abstract
The invention discloses a lead storage battery plate grid alloy containing a nanometer tungsten carbide material and a preparation method and belongs to the technical field of lead storage battery preparation. The plate grid alloy comprises, by weight percentage, 0.1-0.8% of tin, 0.05-0.5% of nanometer tungsten carbide and the balance lead. According to the lead storage battery plate grid alloy containing the nanometer tungsten carbide material, by adding the nanometer tungsten carbide material, current metal calcium is replaced with the nanometer tungsten carbide material, and the intercrystalline corrosion, caused by calcified lead, of the plate grid alloy is remarkably reduced; and the combination and the structure of the crystalline grain interface of a lead alloy are improved, and the hardness, the creep resistance, the corrosion resistance and the like of the lead alloy are remarkably improved. A mother alloy containing a tungsten carbide composite material is prepared through a low temperature smelting method, then the mother alloy is utilized to prepare a tungsten carbide composite alloy, and it can be guaranteed that the nanometer tungsten carbide material is uniformly dispersed in the lead alloy, so that the lead alloy performance can be improved. In addition, the temperature is controlled below 500 DEG C in the whole preparation process, energy is remarkably saved, and lead slag produced in the smelting process is little.
Description
technical field [0001] The invention relates to the technical field of lead storage battery preparation, in particular to a lead storage battery grid alloy containing nano-tungsten carbide material and a preparation method thereof. Background technique [0002] Lead alloy is the battery grid material, and its corrosion resistance directly affects the cycle life of the battery. At present, lead-calcium-tin-aluminum alloy is mainly used as the grid material, which has high hardness and can guarantee industrial production. Since elemental calcium mainly exists between grain boundaries in the form of calcified lead, its corrosion resistance is poor. Lead-calcium-tin-aluminum alloy is easy to cause the early capacity loss of the battery. Therefore, the selection of new additive materials to ensure the hardness of the alloy while improving its corrosion resistance is the focus of lead-acid battery research. [0003] Since the corrosion of lead alloys mainly starts from the grain...
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