CN112894046A - Method for enhancing corrosion resistance of aluminum alloy soldered joint - Google Patents
Method for enhancing corrosion resistance of aluminum alloy soldered joint Download PDFInfo
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- CN112894046A CN112894046A CN202110129153.6A CN202110129153A CN112894046A CN 112894046 A CN112894046 A CN 112894046A CN 202110129153 A CN202110129153 A CN 202110129153A CN 112894046 A CN112894046 A CN 112894046A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/06—Soldering, e.g. brazing, or unsoldering making use of vibrations, e.g. supersonic vibrations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/026—Anodisation with spark discharge
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/18—After-treatment, e.g. pore-sealing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/10—Aluminium or alloys thereof
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Abstract
The invention discloses a method for enhancing corrosion resistance of an aluminum alloy soldered joint, which belongs to the technical field of material corrosion resistance, and comprises the steps of taking aluminum or aluminum alloy as a matrix, carrying out oxidation treatment on the aluminum or aluminum alloy to form a passivation layer, and then carrying out ultrasonic soldering on the aluminum or aluminum alloy by using tin-based solder; the invention utilizes the micro-arc oxidation method to generate Al on the surface of alumina in the electrolyte2O3The ceramic oxide film reduces the potential difference between the surface of the base material and the filler metal of the welding seam, and the ultrasonic-assisted brazing is used for realizing the connection of the joint, thereby improving the continuity and the forming quality of the welding seam and reducing the jointThe corrosion rate of (c); the ultrasonic wave is applied to the aluminum alloy substrate, so that the method can be suitable for the connection of large test pieces, is suitable for the connection of various shapes and positions, is not limited by an ultrasonic electric soldering iron probe, and greatly increases the practicability of the method; the conventional tin-based brazing filler metal is used for connecting the surfaces of the aluminum alloys, so that the corrosion resistance of joints can be effectively improved, and meanwhile, the brazing filler metal and the welding cost are greatly reduced.
Description
Technical Field
The invention belongs to the technical field of material corrosion prevention, and particularly relates to a method for enhancing the corrosion resistance of an aluminum alloy soldered joint.
Background
In recent years, with the rapid development of the electronic industry and the rapid popularization of high-speed data transmission technology, various electronic communication devices have fierce market competition, and higher requirements are provided for the quality and the service life of electronic products. In the package structure commonly existing in various electronic devices, aluminum and aluminum alloy are used as common packaging materials, and corrosion of aluminum metal is an important factor affecting reliability of the package structure. The connection of aluminum and aluminum alloy is used as an important part of a packaging structure, and in the use process, the corrosion resistance and the mechanical property are reduced due to the low welding quality, so that the service life is shortened. The micro-arc oxidation process is widely applied to the surface treatment of aluminum and aluminum alloy, and the formed oxide film is gradually thickened and compact along with the increase of the oxidation time, so that the corrosion resistance of the material can be effectively improved, and the service life of the material can be effectively prolonged.
The following factors affect the corrosion resistance of electronic packaging structures represented by aluminum and aluminum alloys: the brazing filler metal has poor wettability on the surface of the aluminum alloy, so that the continuity of connection at an interface is reduced, and the corrosion resistance of the structure is poor; the tin-aluminum equilibrium potential difference is large, the corrosion driving force is large, and the corrosion resistance is reduced.
For packaging systems of aluminum and its alloys, the following problems still exist: the aluminum alloy welding joint under low-temperature packaging has good performance, but the corrosion resistance of the joint is reduced due to brazing flux residue generated in the welding process; at present, the market mainly adopts the coating treatment on the joint after welding to improve the corrosion resistance of the joint, but the working procedure is complex, the surface quality is difficult to ensure, the pitting phenomenon is easy to occur, and the service life of the joint is shortened. Most of the existing brazing methods adopt a brazing flux brazing method to realize the welding of aluminum and aluminum alloy, toxic gas is released during brazing flux reaction, the environment is not protected, and the mechanical property and the corrosion property of joints are reduced due to residual brazing flux.
In conclusion, a method for enhancing the corrosion resistance of the aluminum alloy soldered joint, which improves the continuity and the molding quality of the soldered joint, reduces the corrosion rate of the joint, is suitable for connection in various shapes and positions and is not limited by an ultrasonic electric soldering iron probe, needs to be researched.
Disclosure of Invention
Aiming at the problems of poor surface forming and reduced corrosion resistance of an aluminum alloy welding joint and reduced service life of a packaging structure, the invention aims to provide a method for enhancing the corrosion resistance of the aluminum alloy brazing joint, which can be suitable for the connection of large-scale test pieces and is suitable for the connection of various shapes and positions, is not limited by an ultrasonic electric iron probe and greatly increases the practicability of the method; can effectively improve the corrosion resistance of the joint and greatly reduce the cost of brazing filler metal and welding.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for enhancing corrosion resistance of an aluminum alloy soldered joint comprises the steps of taking aluminum or aluminum alloy as a matrix, carrying out oxidation treatment on the surface of the aluminum or aluminum alloy to form a passivation layer, and then carrying out ultrasonic soldering on the passivation layer of the aluminum or aluminum alloy by using tin-based solder.
Further, the substrate is pure aluminum or an aluminum alloy of the 2XXX-7XXX series. The aluminum alloy is 2-7 series aluminum alloy with any grade.
Further, the oxidation treatment is micro-arc oxidation treatment, and the alkaline micro-arc oxidation electrolyte used in the micro-arc oxidation treatment comprises: 10-12g/l of sodium silicate, 9-11g/l of sodium phosphate, 2-3g/l of potassium hydroxide and 1-2g/l of ammonium metavanadate. And stirring the electrolyte to be clear by using a magnetic stirrer at room temperature, wherein the stirring speed is 300r/min, and the specific stirring speed can be adaptively adjusted according to actual conditions.
Further, the method can be used for preparing a novel materialThe micro-arc oxidation treatment adopts a bipolar pulse power supply, and the current density is 9-11A/dm2The voltage is 80-85V, the frequency is 400-600Hz, and the pulse width is 16-24%.
Furthermore, the micro-arc oxidation time is 10-25min, and the thickness of the passivation layer is 10-25 um; preferably, the time of micro-arc oxidation is 15-20 min.
Further, before ultrasonic brazing, carrying out mechanical pre-scraping treatment on the passivation layer of the aluminum or the aluminum alloy to be welded; the mechanical pre-scraping treatment comprises the following steps: after the brazing filler metal is melted, mechanically pre-scraping the position to be welded on the surface of the aluminum or the aluminum alloy by using a metal sheet or a tin-based brazing filler metal, so that a local passivation layer is ground, and the aluminum or the aluminum alloy matrix and the melted tin-based brazing filler metal are locally wetted. Partial wetting is to say that the part to be welded is wetted.
Further, the ultrasonic brazing comprises the following steps: performing ultrasonic brazing by using an ultrasonic probe to act on the position to be welded of the aluminum or aluminum alloy passivation layer; wherein the contact pressure of the probe is 20-30N, the frequency of the ultrasonic wave is 19-21KHz, the power of the ultrasonic generator is 300-2000W, and the application time of the ultrasonic wave is 5-30 s.
Further, the tin-based solder is a tin-based solder containing no active elements. The tin-based solder is a common tin-based low-temperature solder and does not contain active elements. Tin-based solders contain, and are not limited to, the following ingredients: Sn-xZn solder (x 0-60 wt.%).
Further, heat preservation treatment is carried out after ultrasonic brazing; the brazing temperature is 200-350 ℃, and the heat preservation time is 30-90 s.
The ultrasonic-assisted brazing enables cavitation bubbles to be generated on the surfaces of the aluminum base material and the brazing filler metal, so that local high-temperature high-pressure oxide films on the brazing filler metal and the base material are removed, and the materials are connected.
The welding process needs to change the time and waveform of the ultrasonic wave action and control the energy of the ultrasonic wave. In addition, the brazing temperature and the heat preservation time need to be well controlled, and the joint structure and the performance are improved.
The surface of an aluminum alloy substrate is polished and cleaned, then the aluminum alloy substrate is placed into an electrolyte tank, and a layer of Al is prepared on the surface of an aluminum substrate by using a micro-arc oxidation process2O3Oxidation of the film and thenThe method comprises the steps of removing a local oxidation film by using a conventional pure tin solder to scrape a position to be welded, then applying ultrasonic waves to an aluminum alloy matrix to break all oxidation films at a connecting part, realizing connection of aluminum substrates subjected to micro-arc oxidation, obtaining a connecting interface without the existence of the oxidation film, and forming a welding joint with micro-arc oxidation protection on the outer surface of the joint, so that the mechanical property and the corrosion resistance of the joint are improved, and the service life of the joint is prolonged.
The invention has the beneficial effects that:
1) the invention utilizes the micro-arc oxidation method to generate Al on the surface of alumina in the electrolyte2O3The ceramic oxide film reduces the potential difference between the surface of the base material and the filler metal of the welding seam, and in addition, the ultrasonic-assisted brazing is used for realizing the connection of the joint, thereby improving the continuity and the forming quality of the welding seam and reducing the corrosion rate of the joint.
2) Compared with the method of applying ultrasonic waves to the ultrasonic electric soldering iron with the liquid solder, the method has the advantages that the ultrasonic waves are applied to the aluminum alloy substrate, the method is suitable for connecting large-scale test pieces, is suitable for connecting various shapes and positions, is not limited by the probe of the ultrasonic electric soldering iron, and greatly increases the practicability of the method.
3) Compared with the brazing method using the active brazing filler metal containing active elements, the method uses the conventional tin-based brazing filler metal to connect the surfaces of the aluminum alloys, can effectively improve the corrosion resistance of joints, and simultaneously greatly reduces the brazing filler metal and the welding cost.
Drawings
FIG. 1 is a schematic diagram of the principle of ultrasonic-assisted brazing of aluminum alloy after surface micro-arc oxidation;
FIG. 2 is a sectional view of a film layer of a pure aluminum substrate after micro-arc oxidation for 20 min;
FIG. 3 shows the microstructure of a welded joint formed by micro-arc oxidation of a pure aluminum substrate for 20 min;
FIG. 4 is a sectional view of a film layer of a pure aluminum substrate subjected to micro-arc oxidation for 10 min;
FIG. 5 is an electrochemical polarization curve of a micro-arc oxidation film with an oxidation time of 20min and a non-micro-arc oxidation surface.
Detailed Description
In order to further illustrate the technical effects of the present invention, the present invention is specifically described below by way of examples.
The innovation point of the invention is that the micro-arc oxidation method is used for preparing Al with the thickness of 10-25um on the surface of the aluminum or the aluminum alloy2O3And oxidizing a film, then performing local scraping treatment on a position to be welded of the base material with the oxide film by adopting a metal sheet or a conventional Sn-based brazing filler metal, then applying ultrasonic waves on an aluminum alloy substrate for auxiliary brazing as shown in fig. 1, damaging the oxide film at the position to be welded to obtain a compact and uniform brazed joint, and wrapping other parts by the oxide film, so that the forming quality and the corrosion resistance of the joint are greatly improved, and the service life of the structure is prolonged.
The corrosion resistance of the joint is evaluated by adopting a soaking corrosion test in the experiment. The etching solution was a 3.5% sodium chloride solution by mass, and the experiment was observed and recorded every 8 hours. The oxide film is the passivation layer.
Example 1
The first step is as follows: preparing a micro-arc oxidation layer, namely firstly polishing the surface of the A7N01 aluminum alloy by using #1000 metallographic abrasive paper, and then putting absolute ethyl alcohol for ultrasonic cleaning to remove surface impurities; drying after cleaning, and putting into electrolyte for micro-arc oxidation, wherein the electrolyte formula is as follows: NaSiO3(10g/l)，KOH(2g/l)，Na3PO4(11g/l)，NH4VO3(2g/l), stirring the electrolyte to be clear by using a magnetic stirrer at room temperature, wherein the stirring speed is 300r/min, and the current density is 10A/dm2Voltage 85V, frequency 500Hz, pulse width 20%, temperature room temperature, and oxidation time 20 min. The surface of the oxide film is flat and compact, the combination with the interface of the aluminum alloy matrix is good, and the thickness of the passivation layer is about 11 um.
The second step is that: and in the welding process, the surface of the base material subjected to micro-arc oxidation is connected by scraping and brazing, the brazing filler metal is melted, and then a steel brush is used for scraping off a local oxidation film at a position to be welded by using the brazing filler metal, and then an ultrasonic probe is contacted with the surface of the aluminum alloy base material, wherein the ultrasonic power is 450W, the ultrasonic wave is applied for 10s, the contact pressure of the ultrasonic probe is 30N, the ultrasonic frequency is 20KHz, and the heat preservation is carried out for 90s at 300 ℃.
The third step: after heat preservation, the workpiece is naturally cooled to room temperature and taken out from the heating chamber; the joint tissue is uniform, and no obvious defect exists in a microscopic mode; the joint cracked to fail after 1088 hours of 3.5% sodium chloride solution immersion corrosion compared to the unoxidized sample.
Example 2
The first step is as follows: preparing a micro-arc oxidation layer, namely firstly polishing the surface of pure aluminum smoothly by using sand paper, and then putting absolute ethyl alcohol into the pure aluminum for ultrasonic cleaning to remove surface impurities; drying after cleaning, and putting into electrolyte for micro-arc oxidation, wherein the electrolyte formula is as follows: NaSiO3(11g/l)，KOH(2g/l)，Na3PO4(10g/l)，NH4VO3(1g/l), stirring the electrolyte to be clear by using a magnetic stirrer at room temperature, wherein the stirring speed is 300r/min, and the current density is 10A/dm2Voltage 80V, frequency 500Hz, pulse width 20%, temperature room temperature, and oxidation time 20 min. As shown in FIG. 2, the oxide film has a smooth and dense surface, and is well bonded with the interface of the aluminum alloy substrate, and the thickness of the passivation layer is about 12 um.
The second step is that: and in the welding process, the substrate surface after micro-arc oxidation is connected by using ultrasonic-assisted brazing, a local oxidation film at the position to be welded is scraped by using a brazing filler metal through a steel brush after the brazing filler metal is melted, then an ultrasonic probe is contacted with the surface of the aluminum alloy substrate, the ultrasonic power is 600W in the whole brazing process, the ultrasonic wave is applied for 20s, the contact pressure of the ultrasonic probe is 20N, the ultrasonic frequency is 21KHz, and the heat preservation is carried out for 90s at 300 ℃.
The third step: and after the heat preservation, the workpiece is naturally cooled to the room temperature and taken out from the heating chamber. The microstructure is shown in figure 3, the oxide film on the interface of the joint is damaged, the brazing seam structure is continuous and uniform, and the joint is cracked and fails after being soaked and corroded for 1168 hours in 3.5% sodium chloride solution.
Example 3
The first step is as follows: preparing a micro-arc oxidation layer, namely firstly polishing the surface of pure aluminum smoothly by using sand paper, and then putting absolute ethyl alcohol into the pure aluminum for ultrasonic cleaning to remove surface impurities; drying after cleaning, and putting into electrolyte for micro-arc oxidation, wherein the electrolyte formula is as follows: NaSiO3(12g/l)，KOH(3g/l)，Na3PO4(9g/l)，NH4VO3(1.5g/l), stirring the electrolyte to be clear by using a magnetic stirrer at room temperature, wherein the stirring speed is 300r/min, and the current density is 9A/dm2Voltage 82V, frequency 500Hz, pulse width 20%, temperature room temperature, oxidation time 15 min. The surface of the oxide film is flat and compact, the bonding with the interface of the aluminum alloy matrix is good, and the thickness of the passivation layer is about 11 um.
The second step is that: and in the welding process, the substrate surface after micro-arc oxidation is connected by using ultrasonic-assisted brazing, a local oxidation film at the position to be welded is scraped by using a brazing filler metal through a steel brush after the brazing filler metal is melted, then an ultrasonic probe is contacted with the surface of the aluminum alloy substrate, the ultrasonic power is 600W in the whole brazing process, the ultrasonic wave is applied for 30s, the contact pressure of the ultrasonic probe is 25N, the ultrasonic frequency is 21KHz, and the heat preservation is carried out for 90s at 200 ℃.
The third step: after heat preservation, the workpiece is naturally cooled to room temperature and taken out from the heating chamber; the joint tissue is uniform, and no obvious defect exists in a microscopic mode; the joint cracked to failure after 936 hours of 3.5% sodium chloride solution immersion corrosion compared to the unoxidized sample.
Example 4
The first step is as follows: preparing a micro-arc oxidation layer, namely firstly polishing the surface of pure aluminum smoothly by using sand paper, and then putting absolute ethyl alcohol into the pure aluminum for ultrasonic cleaning to remove surface impurities; drying after cleaning, and putting into electrolyte for micro-arc oxidation, wherein the electrolyte formula is as follows: NaSiO3(11g/l)，KOH(2.5g/l)，Na3PO4(9g/l)，NH4VO3(1.5g/l), stirring the electrolyte to be clear by using a magnetic stirrer at room temperature, wherein the stirring speed is 300r/min, and the current density is 11A/dm2Voltage 82V, frequency 500Hz, pulse width 20%, temperature room temperature, oxidation time 15 min. The surface of the oxide film is flat and compact, the bonding with the interface of the aluminum alloy matrix is good, and the thickness of the passivation layer is about 10 mu m.
The second step is that: and in the welding process, the substrate surface after micro-arc oxidation is connected by using ultrasonic-assisted brazing, a local oxidation film at the position to be welded is scraped by using brazing filler metal by using a steel brush after the brazing filler metal is melted, then an ultrasonic probe is contacted with the surface of the aluminum alloy substrate, the ultrasonic power is 600W in the whole brazing process, the ultrasonic wave is applied for 20s, the contact pressure of the ultrasonic probe is 25N, the ultrasonic frequency is 19.8KHz, and the heat preservation is carried out at 350 ℃ for 30 s.
The third step: after heat preservation, the workpiece is naturally cooled to room temperature and taken out from the heating chamber; the joint tissue is uniform, and no obvious defect exists in a microscopic mode; the joint cracked and failed after 1096 hours of 3.5% sodium chloride solution immersion corrosion compared to the unoxidized sample.
Comparative example 1
The parameters of the comparative example are detailed in table 1, and the rest steps and parameters are consistent with those of example 2; the joint soaking corrosion life of the 3.5% sodium chloride solution was 216 hours.
Comparative example 2
The parameters of the comparative example are detailed in table 1, and the rest steps and parameters are consistent with those of example 2; the joint immersion corrosion life was 152 hours.
The experimental results of the above examples are shown in table 1:
TABLE 1 immersion corrosion performance of welded joint after micro-arc oxidation of aluminum alloy
As can be seen from Table 1, the welded joint prepared by the scheme utilizes the micro-arc oxidation method to generate Al on the surface of aluminum oxide in the electrolyte2O3The ceramic oxide film reduces the potential difference between the surface of the base material and the weld filler metal, and in addition, ultrasonic-assisted brazing is used for realizing the connection of the joint, so that the continuity and the forming quality of the weld are improved.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the technical solutions of the present invention are described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the present invention, which should be covered by the protection scope of the present invention.
Claims (10)
1. A method for enhancing corrosion resistance of an aluminum alloy soldered joint is characterized in that aluminum or aluminum alloy is used as a matrix, oxidation treatment is carried out on the surface of the aluminum or aluminum alloy to form a passivation layer, and then ultrasonic soldering is carried out on the passivation layer of the aluminum or aluminum alloy by utilizing tin-based solder.
2. The method of claim 1, wherein the substrate is pure aluminum or a 2XXX-7XXX series aluminum alloy.
3. The method according to claim 1, wherein the oxidation treatment is a micro-arc oxidation treatment, and the alkaline micro-arc oxidation electrolyte used in the micro-arc oxidation treatment comprises: 10-12g/l of sodium silicate, 9-11g/l of sodium phosphate, 2-3g/l of potassium hydroxide and 1-2g/l of ammonium metavanadate.
4. The method according to claim 3, wherein the micro-arc oxidation treatment is carried out using a bipolar pulse power source at a current density of 9-11A/dm2The voltage is 80-85V, the frequency is 400-600Hz, and the pulse width is 16-24%.
5. The preparation method according to claim 3, wherein the micro-arc oxidation time is 10-25min, and the thickness of the passivation layer is 10-25 um; preferably, the time of micro-arc oxidation is 15-20 min.
6. The method for preparing according to claim 1, characterized in that the passivation layer of aluminum or aluminum alloy to be welded is subjected to a mechanical pre-scraping treatment before ultrasonic brazing; the mechanical pre-scraping treatment comprises the following steps: after the brazing filler metal is melted, mechanically pre-scraping the position to be welded on the surface of the aluminum or the aluminum alloy by using a metal sheet or a tin-based brazing filler metal, so that a local passivation layer is ground, and the aluminum or the aluminum alloy matrix and the melted tin-based brazing filler metal are locally wetted.
7. The method of manufacturing according to claim 6, wherein the ultrasonic brazing includes the steps of: performing ultrasonic brazing by using an ultrasonic probe to act on the position to be welded of the aluminum or aluminum alloy passivation layer; wherein the contact pressure of the probe is 20-30N, the frequency of the ultrasonic wave is 19-21KHz, the power of the ultrasonic generator is 300-2000W, and the application time of the ultrasonic wave is 5-30 s.
8. The production method according to claim 1, wherein the tin-based solder is a tin-based solder containing no active element.
9. The method of manufacturing according to claim 8, wherein the tin-based solder includes Sn-xZn solder, and x is 0 to 60 wt.%.
10. The production method according to claim 1, wherein the ultrasonic brazing is followed by heat-insulating treatment; the brazing temperature is 200-350 ℃, and the heat preservation time is 30-90 s.
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| CN115502604A (en) * | 2022-09-29 | 2022-12-23 | 安徽科技学院 | Brazing filler metal for magnesium alloy, using method and soldering flux thereof |
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