CN102352498A - Method for preparing Al/Pb lamellar composite materials - Google Patents
Method for preparing Al/Pb lamellar composite materials Download PDFInfo
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- CN102352498A CN102352498A CN2011103063009A CN201110306300A CN102352498A CN 102352498 A CN102352498 A CN 102352498A CN 2011103063009 A CN2011103063009 A CN 2011103063009A CN 201110306300 A CN201110306300 A CN 201110306300A CN 102352498 A CN102352498 A CN 102352498A
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/14—Electrodes for lead-acid accumulators
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M4/04—Processes of manufacture in general
- H01M4/0438—Processes of manufacture in general by electrochemical processing
- H01M4/045—Electrochemical coating; Electrochemical impregnation
- H01M4/0452—Electrochemical coating; Electrochemical impregnation from solutions
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- H01M4/04—Processes of manufacture in general
- H01M4/0438—Processes of manufacture in general by electrochemical processing
- H01M4/045—Electrochemical coating; Electrochemical impregnation
- H01M4/0454—Electrochemical coating; Electrochemical impregnation from melts
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- H—ELECTRICITY
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- H01M4/04—Processes of manufacture in general
- H01M4/0483—Processes of manufacture in general by methods including the handling of a melt
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- H—ELECTRICITY
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/14—Electrodes for lead-acid accumulators
- H01M4/16—Processes of manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/82—Multi-step processes for manufacturing carriers for lead-acid accumulators
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Abstract
The invention relates to a method for preparing Al/Pb composite materials, which comprises three steps of base body surface pretreatment, surface chemical plating and metal bathing. An Al base body adopts a molten salt method for surface pretreatment for removing oil and oxides on the base body surface, and the fresh surface is protected form being oxidized again; the molten salt chemical plating is carried out in chloride molten salt containing lead elements, in addition, a certain amount of auxiliary salt is added into the molten salt for optimizing the alloy composition of a plating layer, and a transition layer is formed at the interface of the Al/Pb composite material; the metal bathing treatment is carried out in a Pb alloy melt body for many times after the chemical plating, and the ingredient and the thickness of the plating layer are controlled; and then, the heat treatment is carried out, the mutual diffusion of bonding interface elements is promoted, the stress of the plating layer is eliminated, the completeness of the plating layer is ensured, and the ingredient uniformity of the plating layer is improved. The method has the advantages that the operation of each work procedure is simple, the firm metallurgical bonding is formed between the Al/Pb composite materials, the Pb plating layer is compact and flat, and the thickness and the ingredients are controllable.
Description
Technical field
The present invention relates to a kind of preparation method of Al/Pb matrix material, particularly a kind of preparation method of Al/Pb stratified composite belongs to metallic substance and fused salt chemistry field.
Background technology
Metal Pb and alloy thereof be because its excellent corrosion resistance and electrocatalysis ability, electrochemical field such as synthesizes and be widely used in hydrometallurgy, lead-acid cell, organism.But because lead density is big, poor electric conductivity, physical strength are low, it can increase labour intensity in actual application, improve electrode resistance volts lost and easy place creep, buckling deformation, and electrochemical process is had a negative impact.Therefore, improve the specific conductivity and the physical strength of Pb alloy electrode, the weight that reduces entire electrode seems particularly important.
With respect to metal Pb, metal A l has following advantage: (1) Al conducts electricity very well, and electric conductivity is 7 times of Pb; (2) physical strength of Al is high, and tensile strength is more than 5 times of Pb; (3) Al is the metal of extensive industrialization, and material is easy to get and low price; 4) Al's is in light weight, and density is merely 24% of Pb.Therefore, if can prepare well-set Pb layer in metal A l both sides, form the Al/Pb matrix material, advantage that can comprehensive two kinds of metals improves the performance of Pb electrode comprehensively.Yet metal A l and Pb are divided into difficult miscible system in thermodynamic system, and metal A l very easily forms the fine and close sull of one deck in air, are difficult at the Al matrix surface and form one deck densification, atresia, and the good Pb coating of basal body binding force.
Traditional aluminium surface lead plating technology; Generally need to be coated with transition layer on the aluminum substrate surface earlier; Announced a kind of preparation method of lead-aluminum composite anode plate like patent 200710065927.3, utilized the method for dipping to plate other metal of one deck in advance, then casting one deck Pb alloy on the surface in surface of aluminum plate.Patent 01135605.7 has been announced a kind of working method of lead-coated light high conducting slab lattice, need surface of aluminum plate in advance immersion plating zinc or copper as transition layer.Patent 200910094290.X has announced the method for a kind of aluminium and aluminum alloy surface Direct Electroplating lead, and aluminum substrate will pass through mechanical grinding, oil removing, alkali erosion, pickling process before lead plating, and between alkali erosion and pickling process, also has electric clean, activation procedure.Though this method has been saved the step of preplating transition layer, required pre-treatment step is many and complicated, and can only obtain pure lead-coat, and non-metallurgical binding between coating and the matrix is unfavorable for its practical application.Muscovite L.A.Yolshina immerses metal A l in the molten chloride that contains the Pb constituent element and carries out electroless plating Pb, has obtained the good Pb coating of bonding force.This method operation is simple, and matrix is the process of a consumption in the process of electroless plating, can guarantee that matrix is a unsalted surface forever, does not have zone of oxidation, and this can improve the bonding force of Al and Pb greatly.But, contain LiCl and KCl in the used fused salt, and the LiCl price is more expensive, the KCl suction is serious, and this has increased preparation cost and difficulty.Add this molten salt system and can only be coated with pure Pb coating, and be difficult to realize the complete covering of Pb coating to the Al matrix, there is hole in coating, does not form metallurgical binding between the Al/Pb, has had a strong impact on the application of Al/Pb matrix material.Contriver early stage is to improving molten salt system, and after the fused salt chemistry plating, increased the metal bath step, though can make coating complete, and bonding force increases, and also has following problem: 1) assist salt SnCl
2Though adding can promote the mutual diffusion of element, do not find in the metallograph significantly to cross coating, and the fused salt surface blistering is serious, very unfavorable to being coated with process; 2) though metal bath step may command Coating composition, the thinner thickness of coating, circulation time under lead-acid cell positive and negative electrode WV will soon peeling, comes off; 3) substrate pretreated is a mechanical grinding, matrix that can not deal with complex shapes.Though and aqueous solution pre-treatment is to the base shape no requirement (NR), the drying process of handling matrix well can make the oxidation again of fresh matrix, to coating and matrix combine totally unfavorable; 4) because whole process time is shorter, and the mutual diffusion of element is insufficient, the bonding force of coating and matrix is not enough.
Therefore, need also need further to improve to this method.
Summary of the invention
The present invention is directed to the deficiency of traditional fused salt chemistry electroplating method, molten salt system and technology have been carried out major tuneup, and its concrete processing parameter is described, make that gained Al/Pb matrix material combines firmly, thickness and controllable component.
The preparation method of a kind of Al/Pb matrix material of the present invention comprises the steps:
The first step: matrix surface pre-treatment
Al or Al alloy substrate are soaked in the fused salt mixt that comprises a kind of muriate and a kind of fluorochemical at least; The metallic element of said muriate and fluorochemical is at least a among Al, Na, K, Ca, Mg, the Li; Said fused salt mixt temperature is 250-600 ℃, and soak time is 30s~10min;
Second step: surface chemical plating
Al or Al alloy substrate that the first step is obtained place PbCl
2-NaCl-CaCl
2Fused salt in, said temperature of molten salt is 350 ℃~550 ℃, the electroless plating time is 30s~5min; At Al or Al alloy substrate coating surface one deck ternary alloy transition layer;
The 3rd step: metal bath
The test specimen that second step was obtained places Pb or Pb alloy (Pb-Me) melt, carries out the one-time surface metal bath at least, and the temperature of said Pb or Pb alloy (Pb-Me) melt is 320~550 ℃, and the time of a said metal bath is 3~60s; Promptly obtain the Al/Pb matrix material.
Among the preparation method of a kind of Al/Pb matrix material of the present invention, in the fused salt of said surface chemical plating, the quality percentage composition of each component is PbCl
250%~90%, NaCl 5%~30%, CaCl
21%~20%;
Among the preparation method of a kind of Al/Pb matrix material of the present invention, also include in the fused salt of said surface chemical plating and account for said PbCl
2-NaCl-CaCl
2Mass percent be the auxilliary salt of 0~10% halogenide, the auxilliary salt of said halogenide is the muriate or the fluorochemical of at least a element among Sn, Cu, Na, K, Ag, Al, the RE.
Among the preparation method of a kind of Al/Pb matrix material of the present invention, the alloying element Me in said Pb or Pb alloy (Pb-Me) melt is selected from least a among Ag, Ca, RE, Bi, Cu, Sn, Sb, the Al.
Among the preparation method of a kind of Al/Pb matrix material of the present invention, said metal bath number of times is 1~5 time, selects according to the requirement to thickness of coating.
The preparation method of a kind of Al/Pb matrix material of the present invention, the Al/Pb matrix material that said metal bath obtains is incubated 30min~5h, furnace cooling in 100~300 ℃.
The preparation method of a kind of Al/Pb matrix material of the present invention comprises the steps:
The first step: substrate pretreated and surface chemical plating
Al or Al alloy substrate are placed PbCl
2-NaCl-CaCl
2In the auxilliary salt of main salt and halogenide, the auxilliary salt of said halogenide is for comprise the fused salt mixt of a kind of muriate and a kind of fluorochemical at least; Said muriatic metallic element is at least a among Sn, Al, Ag, Cu, the RE, and the metallic element of fluorochemical is at least a among Na, K, Mg, the Li; The quality percentage composition of the auxilliary salt of said halogenide is 0~10%; The temperature of said fused salt is 350 ℃~550 ℃, and the fused salt treatment time is 30s~20min; At Al or Al alloy substrate coating surface one deck ternary alloy transition layer;
Second step: metal bath
The test specimen that the first step is obtained places Pb or Pb alloy (Pb-Me) melt, carries out the one-time surface metal bath at least, and the temperature of said Pb or Pb alloy (Pb-Me) melt is 320~550 ℃, and the time of a said metal bath is 3~60s; Promptly obtain the Al/Pb matrix material.
The present invention has carried out major tuneup to traditional molten electroless plating Pb method, and technological process and gained Al/Pb matrix material have following advantage:
(1) the surface preparation step of matrix, utilize partially halogenated thing fused salt can with Al
2O
3The characteristics of reaction, the greasy dirt and the sull of removing aluminum alloy surface.Realize oil removing and remove one step of oxide compound and accomplish, and avoided the mechanical grinding method can not the dealing with complicated matrix and the aqueous solution handle the defective of the reoxidation of back drying course.Simultaneously, the fused salt pre-treatment can be carried out effective preheating and activation with matrix, helps improving Al surface chemical plating reaction uniformity and the difform Al/Pb matrix material of preparation;
(2) adopt PbCl
2-NaCl-CaCl
2Fused salt carries out surface chemical plating, can guarantee fresh Al surface not by oxidation again, and Al combines firmly with Pb.Particularly at PbCl
2-NaCl-CaCl
2Fused salt in add the auxilliary salt (CuCl of small amount of halide
2, NaF, AgCl and RECl
2), not only can effectively promote the Al/Pb interface to form the ternary alloy transition layer, and the appearance that can stop fused salt surfactant foam layer, make easy and simple to handle;
(3) the employing metal bath after the fused salt chemistry plating is handled; And under the temperature lower, carry out repeatedly metal bath than fused salt, can effectively regulate and control the composition and the thickness of coating, and repair the hole in the coating in the electroless plating process; Make coating smooth, smooth, complete, satisfy application requiring;
(4) the Al/Pb matrix material to preparation carries out 100~300 ℃ insulation annealing, can promote the mutual diffusion of bonding interface element, forms tangible transition layer, thereby further improves the bonding force of coating and matrix.
In sum, process method of the present invention is simple, and is easy to operate, to the shape no requirement (NR) of matrix, helps on the Al of complicacy matrix, forming the complete and uniform Pb alloy layer of thickness.Simultaneously, formed firm metallurgical binding between gained Al/Pb composite layer and the matrix, Pb coating is fine and close, smooth, thickness and controllable component.Be suitable for industrial applications.
Embodiment
In conjunction with following examples content of the present invention is elaborated.
Embodiment 1:
With metal A l is matrix, at 250 ℃ AlCl
3Surface preparation 20min in the-KF melt takes out matrix, and immerses PbCl
2(50wt.%)-NaCl (30wt.%)-CaCl
2(20wt.%) carry out surface chemical plating in the melting salt, temperature of molten salt is 550 ℃; Behind the 30s matrix is taken out from fused salt; Immerse temperature immediately and be and carry out surface metal in 550 ℃ Pb-Sb (15wt.%) alloy melt and bathe; Take out behind the 20s, at 100 ℃ of following thermal treatment 5h, obtaining thickness of coating is the Al/Pb-Sb stratified composite of 40um with sample.
Embodiment 2:
With porous metal Al-Sn (5wt.%) alloy is matrix, at 600 ℃ NaF-CaCl
2Surface preparation 30s in the-NaCl melt takes out matrix, and immerses PbCl
2(80wt.%)-NaCl (10wt.%)-CaCl
2(8wt.%)-CuCl
2(2wt.%) carry out surface chemical plating in the melting salt, temperature of molten salt is 450 ℃.Behind the 4min matrix is taken out from fused salt; Immerse temperature immediately and be and carry out surface metal in Pb-Sn (3wt.%)-Ca (0.4wt.%) alloy melt of 320 ℃ and bathe; Take out behind the 3s; Repeat metal bath 5 times, at 200 ℃ of following thermal treatment 2.5h, obtaining thickness of coating is the Al-Sn/Pb-Sn-Ca composite porous material of 250um with sample.
Embodiment 3:
With metal A l-Cu (0.3wt.%)-Si (5wt.%) alloy is matrix, and surface preparation 10min in 400 ℃ KF-KCl melt takes out matrix, and immerses PbCl
2(92wt.%)-NaCl (5wt.%)-CaCl
2(1.5wt.%)-and carrying out surface chemical plating in NaF (0.5wt.%)-AgCl (1wt.%) melting salt, temperature of molten salt is 360 ℃; Behind the 5min matrix is taken out from fused salt; Immerse temperature immediately and be and carry out surface metal in Pb-Ag (1wt.%)-Nd (0.05wt.%) alloy melt of 350 ℃ and bathe; Take out behind the 60s; Repeat metal bath 3 times, at 300 ℃ of following thermal treatment 30min, obtaining thickness of coating is the Al-Cu-Si/Pb-Ag-Nd matrix material of 170um with sample.
Embodiment 4:
With metal A l rod is matrix, and it is immersed PbCl
2(82wt.%)-NaCl (10wt.%)-CaCl
2(5.5wt.%)-NaF (0.5wt.%)-CeCl
2(2wt.%) carry out surface preparation and electroless plating in the melting salt, temperature of molten salt is 430 ℃.Behind the 3min matrix is taken out from fused salt; Immerse temperature immediately and be and carry out surface metal in Pb-Sb (2wt.%)-Ce (0.05wt.%) alloy melt of 350 ℃ and bathe; Take out behind the 30s; Repeat metal bath 3 times, at 300 ℃ of following thermal treatment 20min, obtaining thickness of coating is the Al/Pb-Sb-Ce matrix material of 170um with sample.
Claims (10)
1. the preparation method of an Al/Pb matrix material comprises the steps:
The first step: matrix surface pre-treatment
Al or Al alloy substrate are soaked in the fused salt mixt that comprises a kind of muriate and a kind of fluorochemical at least; The metallic element of said muriate and fluorochemical is at least a among Al, Na, K, Ca, Mg, the Li; Said fused salt mixt temperature is 250-600 ℃, and soak time is 30s~10min;
Second step: surface chemical plating
Al or Al alloy substrate that the first step is obtained place PbCl
2-NaCl-CaCl
2Fused salt in, said temperature of molten salt is 350 ℃~550 ℃, the electroless plating time is 30s~5min; At Al or Al alloy substrate coating surface one deck ternary alloy transition layer;
The 3rd step: metal bath
The test specimen that second step was obtained places Pb or Pb alloy (Pb-Me) melt, carries out the one-time surface metal bath at least, and the temperature of said Pb or Pb alloy (Pb-Me) melt is 320~550 ℃, and the time of a said metal bath is 3~60s; Promptly obtain the Al/Pb matrix material.
2. the preparation method of a kind of Al/Pb matrix material according to claim 1 is characterized in that: in the fused salt of said surface chemical plating, the quality percentage composition of each component is PbCl
250%~90%, NaCl5%~30%, CaCl
21%~20%;
3. the preparation method of a kind of Al/Pb matrix material according to claim 2 is characterized in that: also include in the fused salt of said surface chemical plating and account for said PbCl
2-NaCl-CaCl
2Mass percent be the auxilliary salt of 0~10% halogenide, the auxilliary salt of said halogenide is the muriate or the fluorochemical of at least a element among Sn, Cu, Na, K, Ag, Al, the RE.
4. the preparation method of a kind of Al/Pb matrix material according to claim 3 is characterized in that: the alloying element Me in said Pb or Pb alloy (Pb-Me) melt is selected from least a among Ag, Ca, RE, Bi, Cu, Sn, Sb, the Al.
5. the preparation method of a kind of Al/Pb matrix material according to claim 4 is characterized in that: said metal bath number of times is 1~5 time.
6. according to the preparation method of any described a kind of Al/Pb matrix material of claim 1-5, it is characterized in that: the Al/Pb matrix material that said metal bath obtains is incubated 30min~5h, furnace cooling in 100~300 ℃.
7. the preparation method of an Al/Pb matrix material comprises the steps:
The first step: substrate pretreated and surface chemical plating
Al or Al alloy substrate are placed PbCl
2-NaCl-CaCl
2In the auxilliary salt of main salt and halogenide, the auxilliary salt of said halogenide is for comprise the fused salt mixt of a kind of muriate and a kind of fluorochemical at least; Said muriatic metallic element is at least a among Sn, Al, Ag, Cu, the RE, and the metallic element of fluorochemical is at least a among Na, K, Mg, the Li; The quality percentage composition of the auxilliary salt of said halogenide is 0~10%; The temperature of said fused salt is 350 ℃~550 ℃, and the fused salt treatment time is 30s~20min; At Al or Al alloy substrate coating surface one deck ternary alloy transition layer;
Second step: metal bath
The test specimen that the first step is obtained places Pb or Pb alloy (Pb-Me) melt, carries out the one-time surface metal bath at least, and the temperature of said Pb or Pb alloy (Pb-Me) melt is 320~550 ℃, and the time of a said metal bath is 3~60s; Promptly obtain the Al/Pb matrix material.
8. the preparation method of a kind of Al/Pb matrix material according to claim 7 is characterized in that: in the fused salt of said surface chemical plating, the quality percentage composition of each component is PbCl
250%~90%, NaCl5%~30%, CaCl
21%~20%;
9. the preparation method of a kind of Al/Pb matrix material according to claim 8 is characterized in that: said metal bath number of times is 1~5 time.
10. according to the preparation method of any described a kind of Al/Pb matrix material of claim 1-9, it is characterized in that: the Al/Pb matrix material that said metal bath obtains is incubated 30min~5h, furnace cooling in 100~300 ℃.
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- 2011-10-11 CN CN2011103063009A patent/CN102352498B/en active Active
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- 2011-10-14 WO PCT/CN2011/001722 patent/WO2012051797A1/en active Application Filing
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US20010004477A1 (en) * | 1999-12-09 | 2001-06-21 | Akira Fukunaga | Solution containing metal component, method of and apparatus for forming thin metal film |
CN101608326A (en) * | 2009-04-03 | 2009-12-23 | 昆明理工大学 | The method of aluminium and aluminum alloy surface Direct Electroplating lead |
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CN101949031A (en) | 2011-01-19 |
ZA201302807B (en) | 2014-05-26 |
WO2012051797A1 (en) | 2012-04-26 |
CN102383145B (en) | 2013-11-06 |
CN102383145A (en) | 2012-03-21 |
CN102352498B (en) | 2013-01-02 |
CN102315455A (en) | 2012-01-11 |
CN102315455B (en) | 2013-08-14 |
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