Anode conducting device for aluminum electrolysis without aluminum steel explosive welding block and manufacturing method thereof

Abstract

The application provides a manufacturing method of an anode conductive device for aluminum electrolysis without aluminum-steel explosive welding block, comprising the following steps: preparing an aluminum-based coating on the surface of the connecting part of the anode steel claw by cold spraying; filling the gap between the connecting end of the anode guide rod and the aluminum-based coating with self-propagating welding powder, igniting the self-propagating welding powder to form a self-propagating welding layer, and realizing the connection between the anode guide rod and the anode steel claw. The manufacturing method provided by the application combines cold spraying and self-propagating welding technology to realize the connection of aluminum-steel dissimilar materials. Compared with the traditional connection method using aluminum-steel explosive welding block, the manufacturing method provided by the application has a novel and unique design, the number of welding openings is reduced to two, the aluminum-based coating and the self-propagating welding layer both have high strength, the overall structure is solid and reliable, the requirements of the on-site service of the anode conductive device are met, the production, maintenance and use cost of the anode conductive device is reduced, and the manufacturing method has a wide popularization and application prospect.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of non-ferrous metallurgy, and particularly relates to an anode conducting device for aluminum electrolysis without aluminum-steel explosion-welded block and a manufacturing method thereof. BACKGROUND

[0002] In the electrolytic aluminum industry, the anode conducting device is composed of an anode aluminum conductor rod and an anode steel claw. As a component of the conducting loop of the aluminum electrolysis cell, the connection mode of the anode conductor rod and the anode steel claw plays a very important role in the aluminum electrolysis production process. The welded joint of aluminum-steel dissimilar materials is prone to brittle intermetallic compounds, which greatly reduces the connection strength of the joint, shortens the service life of the anode steel claw, and increases the production cost of the enterprise. The existing technology is to weld the aluminum-steel explosion-welded block with the aluminum conductor rod and the anode steel claw along the periphery of the contact area, effectively avoiding the generation of brittle intermetallic compounds in the aluminum-steel welding process. However, the aluminum conductor rod and the explosion-welded block ring weld seam part will occasionally crack, resulting in a decrease in the current-carrying cross section, an increase in the local current density, a sharp rise in the temperature at the cracking site, and an extremely easy occurrence of the steel claw and anode carbon block falling into the electrolysis cell, which leads to an increase in the cell voltage and brings hidden dangers to the operation of the electrolysis cell.

[0003] Patent CN109518229A invented a method of connecting anode lead and steel claw by friction welding, although the service life is greatly improved, but the aluminum-steel connection joint obtained by friction welding will cause the anode lead to be shortened due to friction during maintenance or replacement, which is not conducive to the recycling of the anode lead, and at the same time, the friction welding equipment is expensive, the production cost of the enterprise is too high, and it is difficult to promote in industry. Patent CN110257860A discloses a composite anode conducting device and a manufacturing method thereof, characterized by a rectangular frame composed of four composite components, the outer side of the rectangular frame is an aluminum base material, and the inner side is a steel base material, the connection of the steel claw and the lead is realized by welding the same material, this method improves the problem of hard and brittle bonding surface, but the weld cross section generates internal moment under the large gravity of the anode steel claw and the carbon block, which is easy to tear from the root of the weld and cause the claw to fall off. At the same time, this method changes the composite components from the traditional square to vertical, and the constraint is too small when welding on the aluminum side, which will cause the aluminum to expand under the large welding heat input, resulting in a warping trend, and thermal stress will be generated at the bonding surface of the aluminum plate and the steel plate, thereby reducing the strength of the composite components. The method of using the inner side as steel will cause difficulty in construction due to the narrow and deep groove when welding the steel plate and the anode steel claw, which is difficult to improve the production efficiency of the factory. Patent CN115048741A discloses an energy-saving anode conducting device for aluminum electrolysis and a manufacturing method thereof, which realizes the connection of the anode lead and the steel claw through the interference fit of the shaft hole, effectively avoids the brittle phase generated during aluminum-steel welding, not only improves the connection strength of the joint, but also reduces the pressure drop at the aluminum-steel dissimilar material connection. However, the interference fit method requires high machining precision of the shaft hole, and the assembly environment must be maintained below -60℃, which to some extent increases the production cost of the enterprise.

[0004] Based on this, without using aluminum-steel explosive welding block, a manufacturing method for realizing high-strength connection between anode lead and anode steel claw is provided to reduce the production, maintenance and use cost of anode conducting device, which is of great significance to the development of aluminum electrolysis industry and is a technical problem to be solved. SUMMARY

[0005] One of the purposes of the present application is to provide a manufacturing method of an anode conducting device for aluminum electrolysis without aluminum-steel explosive welding block.

[0006] The second purpose of the present application is to provide an anode conducting device for aluminum electrolysis with high connection strength and good use effect.

[0007] The technical solution adopted by one of the purposes of the present application is to provide a manufacturing method of an anode conducting device for aluminum electrolysis without aluminum-steel explosive welding block, comprising the following steps:

[0008] An aluminum-based coating is prepared on the surface of the connecting part of the anode steel claw by cold spraying; a self-propagating welding powder is used to fill the gap between the connecting end of the anode guide rod and the aluminum-based coating, and a self-propagating welding layer is formed by igniting the self-propagating welding powder, so as to realize the connection of the anode guide rod and the anode steel claw.

[0009] In the present application, the aluminum-based coating and the self-propagating welding layer are formed between the anode steel claw and the aluminum guide rod by combining cold spraying and self-propagating welding technology, so as to realize the connection of aluminum (anode guide rod) and steel (steel claw) dissimilar materials. Compared with the three welds formed by the traditional connection method of aluminum-steel explosive welding block, the manufacturing method provided by the present application has novel and unique design, reduces the number of welds to two, has a solid and reliable structure, improves the joint strength and the conductive area of the joint, has a simple process flow, and is suitable for application under various working conditions. In the present application, the aluminum-based coating is prepared on the surface of the steel claw by cold spraying. The low-hardness aluminum-based powder is instantaneously subjected to adiabatic shearing when it collides with the steel substrate at high speed, a large amount of heat is generated due to plastic deformation of the powder, the coating is locally overheated and melted at this time, so as to generate metallurgical bonding. At the same time, the powder collides with the surface of the steel claw and is subjected to severe plastic deformation, and is tightly contacted with each other to form mechanical interlocking. The previously deposited aluminum-based coating is further compacted under the impact of the continuously supplied high-speed powder, so as to form an aluminum-based coating with low porosity and firm bonding, and the bonding strength of the steel-aluminum cold sprayed coating can reach about 95 MPa. Further, the aluminum-based cold sprayed coating and the anode aluminum guide rod are connected by self-propagating welding, and the mechanical properties and conductive properties of the aluminum-aluminum dissimilar material welded joint are far higher than those of the aluminum-steel dissimilar material welded joint. Compared with the conventional laser welding, MIG welding and manual arc welding, the self-propagating full-face welding significantly improves the effective contact area of the anode guide rod and the steel claw, increases the bonding strength, reduces the resistance at the joint, and improves the conductive capacity of the joint.

[0010] Further, the surface of the connecting part of the anode steel claw is pretreated before the aluminum-based coating is prepared. The pretreatment includes one or a combination of more than one of the following methods: shot blasting, laser cleaning, mechanical polishing and the like.

[0011] In the present application, the connecting part of the anode steel claw can be a region or a protruding structure directly arranged on the upper surface of the anode steel claw, or a groove arranged on the upper surface of the anode steel claw and used for accommodating the connecting end of the anode guide rod.

[0012] When the connecting part of the anode steel claw is arranged on the upper surface of the anode steel claw, the aluminum-based coating is prepared on the upper surface of the connecting part of the anode steel claw by cold spraying, and the self-propagating welding powder is filled between the lower surface of the anode guide rod and the aluminum-based coating, so that the connection between the anode steel claw and the anode guide rod is realized. Preferably, a graphite mold is sleeved outside the anode guide rod and the connecting part of the anode steel claw to be connected, and a gap is left between the anode guide rod and the anode steel claw. Under the auxiliary action of the graphite mold, the self-propagating welding powder fills the gap. The advantage of this processing method is that it does not need to change the structure of the existing steel claw, and it does not need to re-open the mold for production, which can be compatible with the common steel claw structure in the current factory, thereby reducing the manufacturing cost.

[0013] When the connecting part of the anode steel claw is a groove arranged on the upper surface of the anode steel claw for accommodating the connecting end of the anode guide rod, the aluminum-based coating is sprayed on the inner surface of the groove, and the self-propagating welding powder is used to fill the gap between the connecting end of the anode guide rod and the aluminum-based coating. Compared with the conventional steel claw structure, the anode steel claw with the groove can increase the contact area between the anode guide rod and the steel claw, and greatly limit the transverse displacement of the anode guide rod caused by expansion at high temperature, thereby significantly improving the shear strength of the joint, prolonging the service life of the anode conductive device, and better adapting to the working conditions with higher requirements. Preferably, the depth of the groove is 10-20 cm.

[0014] Further, in the cold spraying, the preheating temperature of the gas is 400-600 DEG C, the gas pressure is 0.6-3.5 MPa, the nozzle distance from the workpiece surface is 5-30 mm, and the spraying speed is 1-20 mm / s. The accelerating gas is selected from one of air, helium, argon and nitrogen. Compared with air, the inert gas has better ability to carry the sprayed powder, and the sprayed powder has higher speed. Preferably, the temperature of the powder when deposited on the substrate surface is 140-160 DEG C.

[0015] In the present application, the aluminum-based coating is prepared as a transition layer by using cold spraying technology. Compared with other welding methods, the present application has the following advantages: first, the energy of cold spraying comes from compressed gas and heating unit, without the need to melt metal particles, which reduces the thermal stress and thermal deformation of the coating, and the thickness of the coating can reach several millimeters or more, which is enough to avoid being burned through during subsequent self-propagating welding operation; second, the cold sprayed coating has good performance, the porosity of the cold sprayed coating is very low, the thermal load of the substrate and the coating is small, the oxidation of the material is less, the crystallization is more uniform, the oxygen content of the formed coating is low, and the coating is more dense; third, the coating preparation process is safe and reliable, has no pollution emission, the compressed gas pressure of low-pressure cold spraying is below 10 atm, the noise is small (below 60 dB), there is no high temperature, flame, radiation, chemical waste, dangerous gas, the operability is strong, the safety is high, and the spraying directionality is good.

[0016] Further, the raw materials of the aluminum-based coating include, in percentage by weight, 50wt.%-100wt.% of Al powder, 0-30wt.% of Zn powder, and 0-35wt.% of Cu powder.

[0017] The aluminum-based coating of the present application can be in the form of pure aluminum powder, or can be added with a certain proportion of Zn powder and / or Cu powder. The addition of an appropriate amount of Zn powder to the Al matrix can improve the corrosion resistance of the cold sprayed coating; the addition of Cu powder can improve the electrical conductivity of the joint and increase the hardness of the coating. Since the hardness of Cu is higher than that of Al and Zn, it has a higher impact speed during cold spraying, which can compact the deposited coating and promote the combination of the coating and the substrate.

[0018] Further, preferably, the thickness of the aluminum-based coating is 5-30mm.

[0019] Further, the components of the self-propagating welding powder include, in percentage by weight, 25wt.%-50wt.% of Al powder, 5wt.%-15wt.% of Zn powder, 20wt.%-35wt.% of CuO2 powder, 5wt.%-9wt.% of SnO2 powder, 9wt.%-16wt.% of CaSO4 powder, 4.5wt.%-8.5wt.% of CaF2 powder, and 0.3wt.%-1.5wt.% of Er2O3 powder, with the total amount of the components being 100wt.%.

[0020] The self-propagating welding powder provided by the present application adopts an Al-CaSO4, Al-Cu2O, and Al-SnO2 self-propagating composite system. The Al-Cu2O self-propagating system has a very strong oxidizing property, and the reaction process is violent, which results in a very high welding temperature and excessive melting of the base material. Therefore, the Al-SnO2 self-propagating system is introduced to regulate the welding stability, and the CaSO4 is used to discharge low-melting-point metals due to its good slagging property, so as to improve the mechanical properties of the weld. The addition of a certain proportion of Zn powder can improve the alloy system of the filler metal, improve the performance of the weld metal, and improve the wettability and flowability of the liquid metal during welding, so as to improve the welding quality. In addition, the addition of a small amount of Er2O3 in the self-propagating welding powder can form elemental Er, aluminum oxide, and Al3Er in the weld, which can become the nucleation center and refine the grains during the cooling of the metal liquid, so as to further improve the strength and toughness of the weld.

[0021] Preferably, the raw materials of the self-propagating welding powder are placed in a drying machine and dried at 50-200℃ for 0.5-4h, and then mixed uniformly to obtain the self-propagating welding powder.

[0022] Preferably, the thickness of the self-propagating welding layer is 10-50mm.

[0023] The technical scheme adopted by the second object of the present application is: providing an anode conductive device for aluminum electrolysis, which is prepared by the manufacturing method according to the first object of the present application; the anode conductive device comprises an anode rod, a self-propagating welding layer, an aluminum-based coating and an anode steel claw.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] (1) The present application provides a manufacturing method of an anode conductive device for aluminum electrolysis without aluminum-steel explosive welding block, which combines cold spraying and self-propagating welding technology to form an aluminum-based coating and a self-propagating welding layer between the anode steel claw and the aluminum rod, thereby realizing the connection of aluminum (anode rod)-steel (steel claw) dissimilar materials. Compared with the traditional connection method using aluminum-steel explosive welding block, which forms three welds, the manufacturing method provided by the present application has a novel and unique design, reduces the number of welds to two, has a solid and reliable structure, a simple process flow and is suitable for application under various working conditions.

[0026] (2) The anode conductive device for aluminum electrolysis prepared by the present application changes the connection of dissimilar materials between the aluminum rod and the steel claw into the connection of similar materials by means of the aluminum-based coating and the self-propagating welding layer, thereby greatly improving the joint strength and the conductive area of the joint. In the anode conductive device for aluminum electrolysis prepared by the present application, the interface strength of the aluminum-based coating formed by cold spraying is 60-100 MPa, and the strength of the self-propagating welding layer is 90-120 MPa, both of which can reach the strength of the cast aluminum base material, thereby meeting the requirements of the on-site service of the anode conductive device. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The present application provides a structure schematic view of an anode conductive device for example 1;

[0028] Figure 2 The present application provides a structure schematic view of an anode conductive device for example 2;

[0029] Figure 3 The present application provides an Al-Zn coating cross-sectional microstructure morphology diagram formed by cold spraying for example 1;

[0030] Figure 4 The present application provides an Al-Zn-Cu coating cross-sectional microstructure morphology diagram formed by cold spraying for example 2;

[0031] Among them, 1-anode rod; 2-self-propagating welding layer; 3-aluminum-based coating; 4-anode steel claw; 5-graphite mold. DETAILED DESCRIPTION

[0032] The technical solutions of the present application will be described clearly and completely below in connection with the embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0033] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0034] The present application will be further described below in connection with specific embodiments, but not as a limitation of the present application.

[0035] The components and parameters of the aluminum-based coating formed by cold spraying in each embodiment of the present application are shown in Table 1.

[0036] Table 1

[0037]

[0038]

[0039] The components (wt.%) of the self-propagating welding powder involved in each embodiment of the present application are shown in Table 2.

[0040] Table 2

[0041] Al powder Zn powder [CuO2] SnO2 CaSO4 CaF2 Er2O3 powder Example 1 35 10 30 6 13 5 1 Example 2 45 8 20 6 14 6.2 0.8 Example 3 28 12 25 9 16 8.5 1.5 Example 4 25 15 35 8 12 4.5 0.5 Example 5 50 5 25 5 9 5.7 0.3

[0042] Embodiment 1

[0043] The present embodiment provides an anode conducting device for aluminum electrolysis without aluminum-steel explosive welding block and a manufacturing method thereof. The structure of the anode conducting device is shown in Figure 1 , which comprises an anode conducting rod 1, a self-propagating welding layer 2, an aluminum-based coating 3 and an anode steel claw 4. The anode steel claw is a traditional steel claw structure, and the upper surface of the steel claw is provided with a boss structure for connecting with the connecting end of the anode conducting rod.

[0044] In the present embodiment, the manufacturing method of the anode conducting device comprises the following steps:

[0045] Step 1: polishing the surface of the anode steel claw using an angle grinder;

[0046] Step 2: preparing a cold spraying Al-Zn coating (Al powder 70wt.%, Zn powder 30wt.%) on the upper surface of the traditional steel claw, the preheating temperature is 500℃, the gas pressure is 0.8MPa, the nozzle distance from the workpiece surface is 10mm, the spraying speed is 4mm / s, and air is used as the accelerating gas;

[0047] Step 3: Fix the anode conductor 1 and the steel claw 4 with the clamping tool, fill the self-propagating welding powder (Al powder 35wt.%, Zn powder 10wt.%, CuO2 powder 30wt.%, SnO2 powder 6wt.%, CaSO4 powder 13wt.%, CaF2 powder 5wt.%, Er2O3 powder 1wt.%) in the middle, and wrap the graphite mold 5 around the welding powder;

[0048] Step 4: Ignite the ignition powder, melt the self-propagating welding powder, and after the metal liquid is completely cooled, remove the graphite mold and the slag on the surface of the weld, and the connection between the anode conductor and the steel claw is completed, and the thickness of the self-propagating layer is 10mm.

[0049] The anode conducting device prepared in this embodiment realizes the connection between the anode conductor and the steel claw by cold spraying and self-propagating welding technology, Figure 3 The microstructure of the Al-Zn coating is shown in the figure, where the black area is the aluminum enrichment area and the white area is the zinc enrichment area. The coating structure is dense and the porosity is very low.

[0050] Through industrial actual working condition test, the overall bonding strength between the steel claw and the anode conductor in the anode conducting device is 93Mpa, which is higher than the tensile strength of cast aluminum (about 80MPa), and meets the field service requirements.

[0051] Example 2

[0052] This embodiment provides an anode conducting device for aluminum electrolysis without aluminum-steel explosive welding block and a manufacturing method thereof. The structure of the anode conducting device is as shown in Figure 2 The anode conducting device includes an anode conductor 1, a self-propagating welding layer 2, an aluminum-based coating 3, and an anode steel claw 4. The upper surface of the anode steel claw is provided with a recess structure for accommodating the connecting end of the anode conductor.

[0053] In this embodiment, the manufacturing method of the anode conducting device includes the following steps:

[0054] Step 1: Prepare a steel claw mold with a recess, and obtain an anode steel claw with a recess by casting. The diameter of the recess is 180mm and the depth is 10cm;

[0055] Step 2: Perform shot blasting treatment on the inner wall of the steel claw hole;

[0056] Step 3: Prepare a cold sprayed Al-Zn-Cu coating (Al powder 52.5wt.%, Zn powder 22.5wt.%, Cu powder 25wt.%) on the inner wall of the steel claw hole. The preheating temperature is 500℃, the gas pressure is 0.8MPa, the nozzle distance from the workpiece surface is 10mm, the spraying speed is 4mm / s, and air is used as the accelerating gas;

[0057] Step 4: The anode guide rod 1 and the steel claw 4 are fixed by using a clamping tool, and the gap between the inner wall of the hole and the anode guide rod is filled with self-propagating welding powder (Al powder 45wt.%, Zn powder 8wt.%, CuO2 powder 20wt.%, SnO2 powder 6wt.%, CaSO4 powder 14wt.%, CaF2 powder 6.2wt.%, Er2O3 powder 0.8wt.%);

[0058] Step 5: Ignite the ignition powder, melt the self-propagating welding powder, and after the metal liquid is completely cooled, remove the slag on the surface of the weld, and the connection of the anode guide rod and the steel claw is completed, and the thickness of the self-propagating layer is 12mm.

[0059] Figure 4 The microstructure of the Al-Zn-Cu coating prepared in this embodiment is shown, wherein the black area is the aluminum enrichment area, the white area is the zinc enrichment area, and the light gray area is the copper enrichment area. The coating structure is dense and the porosity is very low.

[0060] Through industrial actual working condition test, the overall bonding strength between the steel claw and the anode guide rod in the anode conductive device is 98Mpa, which meets the field service requirements.

[0061] Example 3

[0062] The structure of the anode conductive device provided in this embodiment is shown as Figure 1 The manufacturing method of the anode conductive device includes the following steps:

[0063] Step 1: Use an angle grinder to polish the surface of the anode steel claw;

[0064] Step 2: Prepare a cold sprayed Al-Cu coating (Al powder 80wt.%, Cu powder 20wt.%) on the upper surface of the traditional steel claw, the preheating temperature is 500℃, the gas pressure is 1MPa, the nozzle distance from the workpiece surface is 10mm, the spraying speed is 4mm / s, and air is used as the accelerating gas;

[0065] Step 3: The anode guide rod 1 and the steel claw 4 are fixed by using a clamping tool, and the gap between the inner wall of the hole and the anode guide rod is filled with self-propagating welding powder (Al powder 45wt.%, Zn powder 8wt.%, CuO2 powder 20wt.%, SnO2 powder 6wt.%, CaSO4 powder 14wt.%, CaF2 powder 6.2wt.%, Er2O3 powder 0.8wt.%);

[0066] Step 4: Ignite the ignition powder, melt the self-propagating welding powder, and after the metal liquid is completely cooled, remove the slag on the surface of the weld, and the connection of the anode guide rod and the steel claw is completed, and the thickness of the self-propagating layer is 12mm.

[0067] Through the industrial actual working condition test, the overall bonding strength between the steel claw and the anode guide rod in the anode conductive device is 93Mpa, which meets the field service requirements.

[0068] Example 4

[0069] The structure of the anode conductive device provided in the embodiment is shown in Figure 2 The manufacturing method of the anode conductive device includes the following steps:

[0070] Step 1: prepare a steel claw mold with a groove, and cast a steel claw with a groove to obtain a steel claw with a groove, the diameter of the groove is 180mm, and the depth is 10cm;

[0071] Step 2: shot blasting treatment is performed on the inner wall of the steel claw hole;

[0072] Step 3: prepare a cold sprayed Al-Zn-Cu coating (Al powder 90wt.%, Zn powder 5wt.%, Cu powder 5wt.%) on the inner wall of the hole of the steel claw, the preheating temperature is 500℃, the gas pressure is 1MPa, the nozzle distance from the workpiece surface is 10mm, the spraying speed is 5mm / s, and helium is used as the accelerating gas;

[0073] Step 4: use clamping tools to fix the anode guide rod 1 and the steel claw 4, and fill the gap between the inner wall of the hole and the anode guide rod with self-propagating welding powder (Al powder 25wt.%, Zn powder 15wt.%, CuO2 powder 35wt.%, SnO2 powder 8wt.%, CaSO4 powder 12wt.%, CaF2 powder 4.5wt.%, Er2O3 powder 0.5wt.%;

[0074] Step 5: ignite the ignition powder, the self-propagating welding powder melts, after the metal liquid is completely cooled, remove the slag on the surface of the weld, the connection of the anode guide rod and the steel claw is completed, and the thickness of the self-propagating layer is 30mm.

[0075] Through the industrial actual working condition test, the overall bonding strength between the steel claw and the anode guide rod in the anode conductive device is 93Mpa, which meets the field service requirements.

[0076] Example 5

[0077] The structure of the anode conductive device provided in the embodiment is shown in Figure 1 The manufacturing method of the anode conductive device includes the following steps:

[0078] Step 1: use an angle grinder to polish the surface of the anode steel claw;

[0079] Step 2: Prepare a cold-sprayed Al coating (Al powder 100wt.%) on the upper surface of the conventional steel claw, the preheating temperature is 500℃, the gas pressure is 1MPa, the nozzle distance from the workpiece surface is 10mm, the spraying speed is 6mm / s, and air is used as the accelerating gas;

[0080] Step 3: Fix the anode lead 1 and the steel claw 4 by using a clamping tool, fill the self-propagating welding powder (Al powder 50wt.%, Zn powder 5wt.%, CuO2 powder 25wt.%, SnO2 powder 5wt.%, CaSO4 powder 9wt.%, CaF2 powder 5.7wt.%, Er2O3 powder 0.3wt.%) in the middle, and wrap the graphite mold 5 around the welding powder;

[0081] Step 4: Ignite the ignition powder, melt the self-propagating welding powder, after the metal liquid is completely cooled, remove the graphite mold and the slag on the surface of the weld, and the connection between the anode lead and the steel claw is completed, and the thickness of the self-propagating layer is 50mm.

[0082] Through the test under the actual working condition of the industry, the overall bonding strength between the steel claw and the anode lead in the anode conductive device is 90Mpa, which meets the requirements of field service.

[0083] The above is only the preferred embodiment of the present application, and does not limit the implementation and protection scope of the present application. For those skilled in the art, it should be realized that any equivalent replacement and obvious change made by applying the content of the present application should be included in the protection scope of the present application.

Claims

1. A method for manufacturing an anode conductive device for aluminum electrolysis without the need for aluminum-steel explosion weld blocks, characterized in that, Includes the following steps: An aluminum-based coating is prepared on the surface of the connecting part of the anode steel claw by cold spraying; self-propagating welding powder is used to fill the gap between the connecting end of the anode guide rod and the aluminum-based coating, and the self-propagating welding powder is ignited to form a self-propagating welding layer, thereby realizing the connection between the anode guide rod and the anode steel claw. In the cold spraying process, the gas preheating temperature is 400~600℃, the gas pressure is 0.6~3.5MPa, the nozzle distance from the workpiece surface is 5~30mm, and the spraying speed is 1~20mm / s. The thickness of the aluminum-based coating is 5~30mm; The self-propagating solder powder comprises, by weight percentage: 25wt.%~50wt.% Al powder, 5wt.%~15wt.% Zn powder, 20wt.%~35wt.% CuO2 powder, 5wt.%~9wt.% SnO2 powder, 9wt.%~16wt.% CaSO4 powder, 4.5wt.%~8.5wt.% CaF2 powder, and 0.3wt.%~1.5wt.% Er2O3 powder, with a total content of 100wt.%.

2. The manufacturing method according to claim 1, characterized in that, Before preparing the aluminum-based coating, the surface of the connecting part of the anode steel claw is pretreated.

3. The manufacturing method according to claim 1, characterized in that, The connecting part of the anode steel claw is a boss provided on the upper surface of the anode steel claw.

4. The manufacturing method according to claim 1, characterized in that, The connecting part of the anode steel claw is a groove; the groove is formed on the upper surface of the anode steel claw and is used to accommodate the connecting end of the anode guide rod.

5. The manufacturing method according to claim 1, characterized in that, The aluminum-based coating comprises, by weight percentage: 50 wt.% to 100 wt.% Al powder, 0 to 30 wt.% Zn powder, and 0 to 35 wt.% Cu powder.

6. The manufacturing method according to claim 1, characterized in that, The thickness of the self-propagating weld layer is 10~50mm.

7. An anode conductive device for aluminum electrolysis, manufactured by the method according to any one of claims 1-6; characterized in that, The anode conductive device includes: an anode guide rod (1), a self-propagating weld layer (2), an aluminum-based coating (3), and an anode steel claw (4).

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