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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

Inactive Publication Date: 2009-07-08
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The surface nickel plating treatment method of the above-mentioned hydrogen storage alloy powder has the following deficiencies: (1) in the treatment process, chemical etching pretreatment and chemical plating treatment are carried out separately, and there are problems such as cumbersome treatment steps and easy to cause secondary oxidation (2) Can not effectively utilize chemical etching treatment liquid and the effective reductive component in the treatment liquid and the hydrogen that produces, cause the problem of waste and the large amount of waste liquid treatment, be unfavorable for actual production and application; (3) Reductive chemical etching The H generated during the treatment process is easily absorbed by the hydrogen storage alloy, resulting in pulverization, which affects the properties of the alloy.
Combining surface etching treatment and surface plating treatment in one treatment solution for R-Mg-Ni based AB 3 The surface treatment technology of type hydrogen storage alloy powder has not been reported yet.

Method used

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  • Surface recombination processing method for rare earth-magnesium-nickel based AB3 type hydrogen storage alloy
  • Surface recombination processing method for rare earth-magnesium-nickel based AB3 type hydrogen storage alloy
  • Surface recombination processing method for rare earth-magnesium-nickel based AB3 type hydrogen storage alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 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, under the protection of argon, use the method of induction melting in the medium frequency induction furnace to melt the above metal and pour it into the cooling In a copper mold cooled by water circulation, an alloy ingot is obtained. Then the alloy ingot is annealed at a high temperature of 1173K for 6 hours, and finally the hydrogen storage alloy is ground and pulverized at room temperature, and passed through a 200-400 mesh sieve to obtain a hydrogen storage alloy powder. Weigh 2g of the hydrogen storage alloy powder sample and put it into the prepared 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 / LNaH 2 PO 2 ·H 2 O (reducing a...

Embodiment 2～5

[0034] According to the process parameters of hydrogen storage alloy smelting and annealing in embodiment 1, smelting 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 according to the experimental parameters listed in Table 2, the surface composite treatment was performed on the prepared hydrogen storage alloy. The electrochemical performance and kinetic performance test results of the hydrogen storage alloy before and after treatment are shown in Figure 6 ~ Figure 9 .

[0035] Table 2 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 graph of the hydrogen storage alloy powder treated in Example 1 and the untreated hydrogen storage alloy powder. It can be seen that th...

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Abstract

The invention relates to a surface complex treating method for a rare-earth - magnesium - nickel base AB3 type hydrogen storage alloy which belongs to the chemical surface treating of metal material field. The method is a surface complex treating technique for the rare-earth - magnesium - nickel base AB3 type hydrogen storage alloy powder processed in a treating solution by surface chemical etching and chemical nickel plating. The hydrogen storage alloy powder is added into the etching solution contained with fluoride for treating, then nickel salt is added for processing surface nickel plating treating. The chemical etching treating is processed by combined action of fluorinion solution, buffer solution, reducing agent and deionized water; the surface nickel plating treating is processed by added nickel ion reduction action with the reducing agent in the treating solution and generated hydrogen directly for depositing on the alloy powder surface. Activation performance, cycle life and dynamic performance of the hydrogen storage alloy are obviously increased after being treated by the method provided by the invention.

Description

technical field [0001] The invention belongs to the field of surface chemical treatment of metal materials, and mainly relates to a surface composite treatment method of hydrogen storage alloy powder. Background technique [0002] In recent years, due to the advantages of high energy, good safety, no pollution, no memory effect and reasonable price, MH / Ni batteries have been widely valued. But the commercialized rare earth-based AB 5 type hydrogen storage alloy due to the crystal structure in the alloy (CaCu 5 ) limits, AB 5 The intrinsic hydrogen storage capacity of the type hydrogen storage alloy is low (~1.4%, mass fraction), and the actual discharge capacity (310-330mAh / g) of the commercialized electrode is already close to the theoretical capacity, and it is difficult to further improve it. To a certain extent, it has affected the development of MH / Ni battery. With the continuous improvement of practical application requirements and the deepening of research, it was...

Claims

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Application Information

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IPC IPC(8): C23F17/00C23F1/16C23C18/32C22C1/02C22F1/10
Inventor 韩树民白桃于李媛扈琳
Owner YANSHAN UNIV
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