Aluminum alloy anti-corrosion sacrificial anode for fresh water and manufacturing method thereof

Abstract

The present invention discloses an aluminum alloy anti-corrosion sacrificial anode for freshwater use and a method for manufacturing the same, relating to the technical field of sacrificial anodes. The technical solution comprises the following components by weight: 12-18% zinc, 0.05-1% magnesium, 0.05-0.15% tin, 0.01-0.04% gallium, <0.1% iron, <0.08% silicon, <0.005% copper, 0.05-0.6% cerium, with the remainder being aluminum. This invention addresses the problems existing magnesium alloy and zinc alloy sacrificial anodes experience in freshwater, as well as the compositional and process deficiencies of existing aluminum alloy sacrificial anodes.

Description

Technical Field

[0001] The present invention relates to the technical field of sacrificial anodes, and in particular to an aluminum alloy anti-corrosion sacrificial anode for fresh water and a manufacturing method thereof. Background Art

[0002] The domestic freshwater corrosion protection market primarily utilizes magnesium alloy sacrificial anodes, but these anodes have significant drawbacks. They exhibit a high self-corrosion rate in freshwater, with current efficiencies typically below 50%. Furthermore, they are susceptible to hydrogen evolution corrosion, resulting in unstable protection.

[0003] Aluminum alloy sacrificial anode has excellent electrochemical performance, with a theoretical capacity of up to 2980A·h / kg and a driving potential of up to 1.1V (vs. Ag / AgCl reference electrode) in a high conductivity seawater environment. It also has the advantages of light weight, high current efficiency and uniform dissolution characteristics, making it an ideal substitute for magnesium alloy sacrificial anode. However, the ion concentration (such as Na) of fresh water (such as river and lake water) is + 、Cl - ) is much lower than that of seawater (usually the conductivity of seawater is 30-50mS / cm, while that of fresh water is only 0.1-1mS / cm), and its ion conductivity is poor. When the aluminum alloy sacrificial anode undergoes oxidation reaction, the released Al 3+ It is difficult to be carried away by rapid diffusion and is easy to react with OH on the anode surface. - Combined to form aluminum hydroxide, and further dehydrated to form a dense aluminum oxide passivation film, the mechanism is as follows: Anode reaction: Al-3e - →Al 3+ ; Solution reaction: Al 3+ +3OH - →Al(OH)3↓; Passivation film formation: 2Al(OH)3→Al2O3+3H2O. This significantly reduces the current conduction efficiency between the aluminum alloy sacrificial anode and the protected metal, slowing the anodic corrosion reaction rate and inhibiting the continued dissolution of the anode, causing the potential to shift in a positive direction. The effective protection current density is insufficient and may not meet the cathodic protection potential requirements of metal structures (for example, steel materials must maintain a potential below -0.85V (CSE) in fresh water), leading to an increased risk of localized corrosion.

[0004] Currently, to address issues such as positive potential shift, surface oxide film formation, uneven dissolution, and reduced current efficiency in freshwater environments, aluminum alloy sacrificial anodes are often activating elements such as Hg, Cd, and In, which are harmful to freshwater pollution. This is closely related to freshwater environmental safety, human health, and the freshwater ecosystem. In terms of manufacturing technology, existing production methods mostly use metal mold casting. The grain uniformity of aluminum alloy sacrificial anode products lags behind international advanced levels, and breakthroughs in precision control technology are needed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing technology, provide an aluminum alloy anti-corrosion sacrificial anode for fresh water and a manufacturing method thereof, solve the problems existing in the existing magnesium alloy and zinc alloy sacrificial anodes in fresh water, and solve the shortcomings of the existing aluminum alloy sacrificial anodes in composition and process.

[0006] The technical solution of the present invention is:

[0007] In one aspect, the present invention provides an aluminum alloy anti-corrosion sacrificial anode for freshwater applications, comprising the following components by weight: 12-18% zinc, 0.05-1% magnesium, 0.05-0.15% tin, 0.01-0.04% gallium, <0.1% iron, <0.08% silicon, <0.005% copper, 0.05-0.6% cerium, with the remainder being aluminum. Cerium has a purifying and preferential oxidizing effect, combining with certain impurity elements in the aluminum alloy to form high-melting-point compounds. This reduces the content of segregated phases in the aluminum alloy, minimizing localized corrosion caused by these phases and making the anode corrosion rate more uniform. This reduces the electrochemical corrosion interference of impurities on the substrate, reduces corrosion caused by microbatteries, and improves the current efficiency of the anode. The oxides and hydroxides formed by cerium on the anode surface can alter the structure of the passivation film, making it more porous and inhibiting the growth of the passivation film on the aluminum alloy sacrificial anode surface. This increases the transport rate of ions and electrons during the anodic reaction, enhances the activation performance of the anode, and facilitates the anodic reaction.

[0008] On the other hand, the present invention provides a method for manufacturing the above-mentioned aluminum alloy anti-corrosion sacrificial anode for fresh water, comprising the following steps:

[0009] S1 preheating: preheat the aluminum ingot to 200-220℃;

[0010] S2 smelting: The preheated aluminum ingot is placed in a crucible, transferred to an aluminum melting furnace and heated until the aluminum ingot is completely melted. Then, zinc, tin, aluminum-magnesium alloy, gallium and aluminum-cerium alloy are added to finally obtain an aluminum alloy melt;

[0011] S3 refining and impurity removal: add sodium-free flux, and after refining, keep the temperature at 730-760℃ for 20-40 minutes to remove impurities;

[0012] S4 directional solidification crystallization: The crucible is placed in the crystallizer and first cooled by circulating cooling water in the jacket outside the crystallizer at a cooling rate of 150-180°C / s. At the same time, secondary cooling is performed through water holes set at intervals at the bottom of the crystallizer. The circulating cooling water jets from the water holes impact the ingot surface at a cooling rate of 60-80°C / s. At the same time, an axial static magnetic field of 0.3-0.5T is applied in the middle of the crystallizer to suppress dendrite segregation, increase the proportion of equiaxed crystals, reduce Sn and Ga element segregation, and improve the uniformity of anode dissolution. The casting rate is 180-200mm / min to obtain a 6m long cylindrical ingot.

[0013] S5 manufactures aluminum alloy anti-corrosion sacrificial anodes for fresh water use: cylindrical ingots are cut into billets and extruded under the conditions of an extrusion ratio of 20-60 and an extrusion rate of 0.5-1m / min. Water mist cooling is set at the extrusion outlet of the extrusion die with a water mist flow rate of 15-20L / min to achieve rapid cooling, significantly reduce the diffusion distance of alloy elements, and reduce the element segregation between grain boundaries and dendrites. This homogenization effect reduces local micro-galvanic corrosion, inhibits self-corrosion hydrogen evolution, thereby improving current efficiency, and finally obtaining aluminum alloy anti-corrosion sacrificial anodes for fresh water use.

[0014] Preferably, in step S2, the crucible is a silicon carbide crucible.

[0015] Preferably, in step S3, the amount of sodium-free flux added is 0.2-1% of the mass of the aluminum ingot.

[0016] Preferably, in step S3, the sodium-free flux is composed of 15-25% by mass of potassium fluoroaluminate, 5-15% by mass of calcium fluoride, 10-25% by mass of potassium carbonate, 10-25% by mass of potassium sulfate, 5-15% by mass of barium sulfate, 15-30% by mass of potassium chloride, and 3-5% by mass of anhydrous aluminum chloride.

[0017] Preferably, in step S4, the temperature of the circulating cooling water is 20-40°C.

[0018] Preferably, in step S5, during extrusion molding, the extrusion die is preheated to 320-340°C, and the billet temperature is 330-360°C.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention's method for manufacturing a freshwater aluminum alloy anti-corrosion sacrificial anode utilizes processes such as impurity-free smelting, flux purification and impurity removal, gradient water-cooled directional solidification crystallization, and low-temperature strong extrusion. This effectively addresses grain uniformity issues associated with aluminum alloy sacrificial anodes and improves the product's electrochemical performance. Furthermore, the present invention's freshwater aluminum alloy anti-corrosion sacrificial anode eliminates harmful elements such as Hg, Cd, and In, meeting environmental requirements and addressing the pollution issues associated with existing aluminum alloy sacrificial anodes in freshwater environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a corrosion state diagram of the aluminum alloy anti-corrosion sacrificial anode for fresh water manufactured in Example 1 of the present invention. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention.

[0023] Example 1

[0024] The aluminum alloy anti-corrosion sacrificial anode for fresh water use in this embodiment is composed of the following components by mass percentage: 12% zinc, 0.05% magnesium, 0.05% tin, 0.01% gallium, 0.05% cerium, 0.06% iron, 0.03% silicon, 0.001% copper, and the remainder aluminum. The manufacturing method includes the following steps:

[0025] S1 preheating: preheat the aluminum ingot to 220℃;

[0026] S2 Melting: Clean the silicon carbide crucible, place the preheated aluminum ingot into the silicon carbide crucible, transfer it to an aluminum melting furnace and heat it to 760°C to completely melt the aluminum ingot. Then, add zinc, tin, aluminum-magnesium alloy, gallium and aluminum-cerium alloy according to the formula ratio to finally obtain an aluminum alloy melt;

[0027] S3 refining and impurity removal: adding a sodium-free flux, which accounts for 0.5% of the mass of the aluminum ingot, and the sodium-free flux is composed of 25% by mass of potassium fluoroaluminate, 15% by mass of calcium fluoride, 15% by mass of potassium carbonate, 15% by mass of potassium sulfate, 10% by mass of barium sulfate, 15% by mass of potassium chloride and 5% by mass of anhydrous aluminum chloride; after the refining is completed, the ingot is kept at 730°C for 20 minutes for static impurity removal;

[0028] S4 directional solidification crystallization: The silicon carbide crucible is placed in the crystallizer and first cooled by circulating cooling water in a jacket outside the crystallizer. The circulating cooling water temperature is 20°C and the cooling rate is 150°C / s. At the same time, secondary cooling is performed through water holes set at intervals at the bottom of the crystallizer. The circulating cooling water jets from the water holes impact the ingot surface at a cooling rate of 80°C / s. At the same time, an axial static magnetic field of 0.5T is applied in the middle of the crystallizer. The casting rate is 200mm / min to obtain a 6m long cylindrical ingot.

[0029] S5 manufactures aluminum alloy anti-corrosion sacrificial anodes for fresh water: cut the cylindrical ingot into billets, and extrude them under the conditions of preheating the extrusion die to 320°C, billet temperature 330°C, extrusion ratio 20, and extrusion rate 0.5m / min. Water mist cooling is set at the extrusion outlet of the extrusion die, and the water mist flow rate is 20L / min to obtain aluminum alloy anti-corrosion sacrificial anodes for fresh water.

[0030] Example 2

[0031] The aluminum alloy anti-corrosion sacrificial anode for fresh water use in this embodiment is composed of the following components by mass percentage: 18% zinc, 1% magnesium, 0.15% tin, 0.04% gallium, 0.6% cerium, 0.07% iron, 0.04% silicon, 0.001% copper, and the remainder aluminum. The manufacturing method includes the following steps:

[0032] S1 preheating: preheat the aluminum ingot to 200℃;

[0033] S2 Melting: Clean the silicon carbide crucible, place the preheated aluminum ingot into the silicon carbide crucible, transfer it to an aluminum melting furnace and heat it to 760°C to completely melt the aluminum ingot. Then, add zinc, tin, aluminum-magnesium alloy, gallium and aluminum-cerium alloy according to the formula ratio to finally obtain an aluminum alloy melt;

[0034] S3 refining and impurity removal: adding sodium-free flux, which accounts for 1% of the mass of the aluminum ingot, and the sodium-free flux is composed of 15% by mass of potassium fluoroaluminate, 5% by mass of calcium fluoride, 25% by mass of potassium carbonate, 10% by mass of potassium sulfate, 15% by mass of barium sulfate, 25% by mass of potassium chloride and 5% by mass of anhydrous aluminum chloride; after the refining is completed, the ingot is kept at 760°C for 40 minutes for static impurity removal;

[0035] S4 directional solidification crystallization: The silicon carbide crucible is placed in the crystallizer and first cooled by circulating cooling water in a jacket outside the crystallizer. The circulating cooling water temperature is 40°C and the cooling rate is 180°C / s. At the same time, secondary cooling is performed through water holes set at intervals at the bottom of the crystallizer. The circulating cooling water jets from the water holes impact the ingot surface at a cooling rate of 60°C / s. At the same time, an axial static magnetic field of 0.3T is applied in the middle of the crystallizer. The casting rate is 180mm / min to obtain a 6m long cylindrical ingot.

[0036] S5 manufactures aluminum alloy anti-corrosion sacrificial anodes for fresh water: the cylindrical ingot is cut into billets, and extrusion molding is performed under the conditions of preheating the extrusion die to 340°C, billet temperature 360°C, extrusion ratio 60, and extrusion rate 1m / min. Water mist cooling is set at the extrusion outlet of the extrusion die, and the water mist flow rate is 15L / min to obtain aluminum alloy anti-corrosion sacrificial anodes for fresh water.

[0037] Example 3

[0038] The aluminum alloy anti-corrosion sacrificial anode for fresh water use in this embodiment is composed of the following components by mass percentage: 15% zinc, 0.55% magnesium, 0.1% tin, 0.025% gallium, 0.3% cerium, 0.08% iron, 0.03% silicon, 0.002% copper, and the remainder aluminum. The manufacturing method includes the following steps:

[0039] S1 preheating: preheat the aluminum ingot to 210℃;

[0040] S2 Melting: Clean the silicon carbide crucible, place the preheated aluminum ingot into the silicon carbide crucible, transfer it to an aluminum melting furnace and heat it to 760°C to completely melt the aluminum ingot. Then, add zinc, tin, aluminum-magnesium alloy, gallium and aluminum-cerium alloy according to the formula ratio to finally obtain an aluminum alloy melt;

[0041] S3 refining and impurity removal: adding a sodium-free flux, which accounts for 0.6% of the mass of the aluminum ingot, and the sodium-free flux is composed of 18% potassium fluoroaluminate, 6% calcium fluoride, 13% potassium carbonate, 25% potassium sulfate, 5% barium sulfate, 30% potassium chloride and 3% anhydrous aluminum chloride in mass percentage; after the refining is completed, the ingot is kept at 740°C for 30 minutes for static impurity removal;

[0042] S4 directional solidification crystallization: The silicon carbide crucible is placed in the crystallizer and first cooled by circulating cooling water in a jacket outside the crystallizer. The circulating cooling water temperature is 30°C and the cooling rate is 160°C / s. At the same time, secondary cooling is performed through water holes set at intervals at the bottom of the crystallizer. The circulating cooling water jets from the water holes impact the ingot surface at a cooling rate of 70°C / s. At the same time, an axial static magnetic field of 0.4T is applied in the middle of the crystallizer. The casting rate is 190mm / min, and a 6m long cylindrical ingot is obtained.

[0043] S5 manufactures aluminum alloy anti-corrosion sacrificial anodes for fresh water: the cylindrical ingot is cut into billets, and extrusion molding is performed under the conditions of preheating the extrusion die to 330°C, billet temperature 350°C, extrusion ratio 40, and extrusion rate 0.8m / min. Water mist cooling is set at the extrusion outlet of the extrusion die, and the water mist flow rate is 18L / min to obtain aluminum alloy anti-corrosion sacrificial anodes for fresh water.

[0044] Comparative Example 1

[0045] The difference from Example 1 is that after refining and removing impurities in step S3, the product is directly poured into a metal mold and naturally cooled and formed to obtain an aluminum alloy anti-corrosion sacrificial anode for fresh water.

[0046] Comparative Example 2

[0047] The difference from Example 1 is that in step S3, a sodium-containing flux consisting of 40% by mass of KCl, 35% by mass of NaCl, 5% by mass of CaF2, 8% by mass of Na3AlF6, 8% by mass of Mg2N3, 3.5% by mass of C2Cl6, and 0.5% by mass of CeF3 is used instead of the sodium-free flux of Example 1.

[0048] Comparative Example 3

[0049] The difference from Example 1 is that in step S4, only primary cooling is performed, and secondary cooling is not performed.

[0050] Comparative Example 4

[0051] The difference from Example 1 is that in step S4, no axial static magnetic field is applied.

[0052] Comparative Example 5

[0053] The difference from Example 1 is that in step S5, the billet temperature is 450° C. and the extrusion ratio is 10.

[0054] Comparative Example 6

[0055] The difference from Example 1 is that in step S5, no water mist cooling is provided at the extrusion outlet of the extrusion die.

[0056] Comparative Example 7

[0057] The difference from Example 1 is that the amount of each raw material added is adjusted so that the final aluminum alloy anti-corrosion sacrificial anode for fresh water is composed of the following components in mass percentage: zinc 12%, magnesium 0.03%, tin 0.02%, gallium 0.005%, iron 0.07%, silicon 0.04%, copper 0.001%, cerium 0.01%, and the rest is aluminum.

[0058] Comparative Example 8

[0059] The difference from Example 1 is that the amount of each raw material added is adjusted so that the final aluminum alloy anti-corrosion sacrificial anode for fresh water is composed of the following components in mass percentage: zinc 12%, magnesium 1.5%, tin 0.2%, gallium 0.05%, iron 0.08%, silicon 0.04%, copper 0.002%, cerium 1%, and the rest is aluminum.

[0060] Comparative Example 9

[0061] The difference from Example 1 is that the amount of each raw material added is adjusted so that the final aluminum alloy anti-corrosion sacrificial anode for fresh water is composed of the following components in mass percentage: zinc 12%, magnesium 0.05%, tin 0.05%, gallium 0.01%, iron 0.06%, silicon 0.03%, copper 0.002%, and the rest is aluminum.

[0062] Comparative Example 10

[0063] Comparative Example 10 uses the magnesium alloy sacrificial anode AZ31B produced by Zibo Deyuan Metal Materials Co., Ltd.

[0064] The performance tests were performed on the aluminum alloy anti-corrosion sacrificial anodes for freshwater use manufactured in Examples 1-3 and Comparative Examples 1-9 and the magnesium alloy sacrificial anode of Comparative Example 10. The tests were performed in accordance with ASTM G97-18 (2022), Standard Test Method for Laboratory Evaluation of Magnesium Sacrificial Anode Specimens for Underground Applications. The test results are shown in Table 1:

[0065] Table 1 Performance test results of sacrificial anodes of Examples 1-3 and Comparative Examples 1-10

[0066]

[0067] It can be seen from the test data in Table 1 that the various performance indicators of the freshwater aluminum alloy anti-corrosion sacrificial anodes manufactured in Examples 1-3 are better than those of the freshwater aluminum alloy anti-corrosion sacrificial anodes manufactured in Comparative Examples 1-9 and the magnesium alloy sacrificial anode of Comparative Example 10. Figure 1It can be seen that the freshwater aluminum alloy anti-corrosion sacrificial anode manufactured in Example 1 corrodes evenly, and the corrosion products are easy to fall off. In Comparative Example 1, metal mold casting is directly performed after refining and impurity removal, resulting in a high content of melt inclusions and coarse structure, which leads to uneven corrosion and rapid self-corrosion. In Comparative Example 2, the sodium-containing flux easily forms Na-Mg compounds with the magnesium in the aluminum alloy, resulting in increased flux viscosity, and the residual sodium will adsorb hydrogen, increasing the risk of sodium embrittlement, causing intergranular corrosion, and reducing current efficiency. Comparative Example 3 only performs primary cooling and no secondary cooling. For aluminum alloys with high zinc content, due to their complex composition, the solidification range will be widened, the liquid phase between the dendrites will be "closed" and shrinkage will occur, and the dendrite segregation will be serious. When the axial static magnetic field is not applied in Comparative Example 4, the ingot grain size is coarse, the dendrite segregation is serious, and the defect rate of cracks, pores, etc. increases significantly, which leads to the subsequent occurrence of slag inclusion crack defects and uneven corrosion. In Comparative Example 5, the extrusion temperature was too high and the extrusion ratio was too low. The high temperature caused elements such as zinc and tin to segregate at the grain boundaries, forming coarse β phase (Al-Zn). The low extrusion ratio caused impurity elements such as Fe and Si to segregate at the grain boundaries, forming cathode phases such as Al6Fe and Al5FeSi. These cathode phases accelerated localized corrosion. In Comparative Example 6, the extrusion outlet was not equipped with water mist cooling. The anode cooled slowly through natural heat dissipation, resulting in significant grain growth. The coarse grains caused "localized preferential corrosion" during anode dissolution, reducing current efficiency. In Comparative Example 7, the aluminum alloy sacrificial anode contained too little magnesium, tin, gallium, and cerium, resulting in potential shifts, insufficient activation ability, structural degradation, and uneven corrosion, reducing current efficiency. In Comparative Example 8, the aluminum alloy sacrificial anode contained too much magnesium, tin, gallium, and cerium, resulting in abnormal potentials, structural degradation, increased self-corrosion, and enhanced passivation tendency, reducing current efficiency. The aluminum alloy sacrificial anode in Comparative Example 9 does not contain cerium, which leads to increased segregation of elements such as zinc and tin between dendrites, forming a continuous β-phase (Al-Zn) network, increasing the generation of brittle phases (such as Al3Fe), increasing the difference in local corrosion current density, and reducing current efficiency. The magnesium alloy sacrificial anode in Comparative Example 10 is prone to dendritic segregation during casting, and Al is enriched at the grain boundaries to form a continuous network phase, leading to intergranular corrosion and reduced current efficiency. In summary, the manufacturing method and composition design of the aluminum alloy sacrificial anode for freshwater use of the present invention can effectively improve the performance of the aluminum alloy sacrificial anode for freshwater use and meet the needs of freshwater corrosion protection.

Claims

1. A method for manufacturing an aluminum alloy anti-corrosion sacrificial anode for fresh water, characterized in that: The aluminum alloy anti-corrosion sacrificial anode for fresh water is composed of the following components in mass percentage: zinc 12-18%, magnesium 0.05-1%, tin 0.05-0.15%, gallium 0.01-0.04%, iron <0.1%, silicon <0.08%, copper <0.005%, cerium 0.05-0.6%, and the rest is aluminum; A method for manufacturing an aluminum alloy anti-corrosion sacrificial anode for fresh water use comprises the following steps: S1 preheating: preheat the aluminum ingot to 200-220℃; S2 smelting: The preheated aluminum ingot is placed in a crucible, transferred to an aluminum melting furnace and heated until the aluminum ingot is completely melted. Then, zinc, tin, aluminum-magnesium alloy, gallium and aluminum-cerium alloy are added to finally obtain an aluminum alloy melt; S3 refining and impurity removal: add sodium-free flux, and after refining, keep the temperature at 730-760℃ for 20-40 minutes to remove impurities; S4 directional solidification crystallization: The crucible is placed in a crystallizer and first cooled by circulating cooling water in a jacket outside the crystallizer at a cooling rate of 150-180°C / s. Simultaneously, secondary cooling is performed through water holes arranged at intervals at the bottom of the crystallizer. The circulating cooling water jets from the water holes impact the ingot surface at a cooling rate of 60-80°C / s. At the same time, an axial static magnetic field of 0.3-0.5T is applied in the middle of the crystallizer. The casting rate is 180-200mm / min to obtain a 6m long cylindrical ingot. S5 manufactures aluminum alloy anti-corrosion sacrificial anodes for fresh water use: cutting a cylindrical ingot into billets, extruding them under conditions of an extrusion ratio of 20-60 and an extrusion rate of 0.5-1 m / min, and providing water mist cooling at the extrusion outlet of the extrusion die with a water mist flow rate of 15-20 L / min to obtain aluminum alloy anti-corrosion sacrificial anodes for fresh water use; In step S5, during extrusion molding, the extrusion die is preheated to 320-340°C, and the billet temperature is 330-360°C.

2. The method for manufacturing the aluminum alloy anti-corrosion sacrificial anode for fresh water use according to claim 1, wherein: In step S2, a silicon carbide crucible is used as the crucible.

3. The method for manufacturing the aluminum alloy anti-corrosion sacrificial anode for fresh water use according to claim 1, wherein: In step S3, the amount of sodium-free flux added is 0.2-1% of the mass of the aluminum ingot.

4. The method for manufacturing the aluminum alloy anti-corrosion sacrificial anode for fresh water use according to claim 1, wherein: In step S3, the sodium-free flux consists of 15-25% by mass of potassium fluoroaluminate, 5-15% by mass of calcium fluoride, 10-25% by mass of potassium carbonate, 10-25% by mass of potassium sulfate, 5-15% by mass of barium sulfate, 15-30% by mass of potassium chloride, and 3-5% by mass of anhydrous aluminum chloride.

5. The method for manufacturing the aluminum alloy anti-corrosion sacrificial anode for fresh water use according to claim 1, wherein: In step S4, the temperature of the circulating cooling water is 20-40°C.

Images