Rare-earth-modified aluminium alloy anode plate and preparation method thereof

Abstract

The invention discloses a rare-earth-modified aluminium alloy anode plate and a preparation method thereof. The anode plate is prepared from raw materials such as an aluminium block, a magnesium block, a bismuth granule, a tin granule, a gallium granule, an indium granule, a lanthanum granule and a cerium granule in the mass ratio of (96.6-99.31):(0.5-2):(0.1-1):(0.05-0.2):(0.01-0.1):(0.01-0.05):(0.01-0.03):(0.01-0.02). Proper amounts of various alloy elements are weighed according to the formula during alloy casting and molten in a resistance furnace crucible at the temperature of 750-800 DEG C, and then alloy melt is poured into a water-cooling steel mold for use. The solid solution temperature in alloy solid solution heat treatment is in a range of 500-560 DEG C, and the solid solution time is in a range of 5-8 h. The single-pass rolling temperature in an alloy rolling machining technology is in a range of 400-450 DEG C, and the single-pass deformation is in a range of 35-45%. The rare-earth-modified aluminium alloy anode plate is low in self-corrosion speed and high in electrochemical activity during high-current-density discharging and meets performance requirements of high current efficiency, stable discharging and small hydrogen evolution amount during movement of an alkaline aluminum battery.

Description

technical field [0001] The invention belongs to the technical field of metal material preparation, and in particular relates to a rare earth modified aluminum alloy anode sheet and a preparation method thereof. Background technique [0002] Metal aluminum is a high-strength energy carrier with an electrochemical equivalent of 2.98Ah / g and a volume equivalent of 8.04Ah / cm 3 . The electrochemical equivalents of other electrode materials lithium, magnesium, and zinc are 3.86, 2.20, and 0.82Ah / g, and the volume equivalents are 2.06, 3.83, and 5.85Ah / cm, respectively. 3 . In addition, the metal aluminum electrode has a negative potential (-1.66V vs. SHE), a wide range of sources, abundant reserves, low price, easy processing and no environmental pollution, and is an ideal electrode material for developing batteries. Using alkaline seawater as the electrolyte, oxygen or silver oxide in the air as the cathode active material, and metal aluminum alloy as the anode, the alkaline a...

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Problems solved by technology

The added alloying elements are cathodic phases relative to the aluminum matrix. Due to the high hydrogen evolution overpotential of the cathodic hydrogen evolution reaction on the alloying elements, it hinders the dissolution of the matrix metal aluminum anode and reduces the hydrogen evolution corrosion rate of the aluminum alloy anode in the solution. , but Pb and Hg, as toxic elements, have limited their application in aluminum alloys in recent years; on the other hand, in order to make aluminum anodes have high electrochemical activity in the working process, Ga, Bi, In and other eutectic alloying elements

After adding such elements, the formed eutectic mixture can form a eutectic crystal when the alloy is solidified, and its melting point is low, and it is in a molten state at the electrode working temperature (60-100 ° C), which can destroy the oxide film and The adhesion between the matrix promotes the further dissolution of the aluminum anode in the electrolyte, thereby improving the electrochemical activity of the aluminum alloy anode. However, due to the low melting point and high specificity of such elements, it is easy to form segregation in the aluminum matrix, resulting in anode corrosion. Inhomogeneous, self-corrosion rate is too high

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