Surface recombination processing method for rare earth-magnesium-nickel based AB3 type hydrogen storage alloy
A technology of hydrogen storage alloy and surface compounding, which is applied in metal material coating technology, liquid chemical plating, coating, etc., can solve the problems of cumbersome processing steps, wasteful treatment of waste liquid volume, pulverization, etc., and achieve cycle stability and dynamic performance improvement, simple and convenient operation, and the effect of reducing environmental pressure
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[0031] Example 1
[0032] Process: According to AB 3 Type hydrogen storage alloy La 0.88 Mg 0.12 Ni 2.95 Mn 0.10 Co 0.55 Al 0.10 Weigh a certain amount of La, Mg, Ni, Mn, Co, Al (purity ≥99.5%) metal, and use induction smelting method in an intermediate frequency induction furnace under the protection of argon to melt the above-mentioned metal and pour it to cool In the copper mold refrigerated by water circulation, an alloy ingot is obtained. Then, the alloy ingot is annealed at a high temperature at 1173K for 6 hours, and finally the hydrogen storage alloy is ground and crushed at room temperature, and passed through a 200 to 400 mesh sieve to obtain hydrogen storage alloy powder. Weigh 2g hydrogen storage alloy powder sample into 60ml chemical etching treatment solution. The composition of the chemical etching solution is: 0.015mol / L HF and 0.1mol / L KF (treatment agent), 0.15mol / L NaAc and 0.015mol / L HAc (buffer solution), 0.05mol / L NaH 2 PO 2 ·H 2 O (reducing agent), the rest ...
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[0033] Examples 2~5
[0034] According to the process parameters of hydrogen storage alloy smelting and annealing in Example 1, smelt the rare earth-magnesium-nickel-based hydrogen storage alloy La 0.72 Mg 0.28 Ni 2.15 Mn 0.14 Co 0.45 Al 0.11 , And in accordance with the experimental parameters listed in Table 2, the prepared hydrogen storage alloy was subjected to surface composite treatment. The electrochemical performance and kinetic performance test results of hydrogen storage alloy before and after treatment are shown in Figure 6 ~ Figure 9 .
[0035] Table 2 The composition (mol / L) and treatment condition parameters of the surface composite treatment solution used in Examples 2 to 5
[0036]
[0037] Note: A stands for hydrogen storage alloy La 0.72 Mg 0.28 Ni 2.15 Mn 0.14 Co 0.45 Al 0.11
[0038] figure 1 It is the initial activation curve of the hydrogen storage alloy powder treated in Example 1 and the untreated hydrogen storage alloy powder. It can be seen that the ...
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