A papilla structure for improving the resistance of alloys to liquid zinc corrosion and its preparation method

Abstract

This invention discloses a papillary structure and its preparation method for improving the resistance of alloys to liquid zinc corrosion, belonging to the technical field of liquid metal corrosion resistance. The papillary structure is uniformly distributed on the alloy surface, with a papillary size of 0.03-1 mm. The preparation method involves two electrical discharge machining (EDM) wire cutting processes on the alloy ingot to obtain the papillary structure for improved liquid zinc corrosion resistance. Specifically, the first cutting is a transverse cut to obtain an initial alloy, and the second cutting involves rotating the initial alloy by 90° and then radially cutting the alloy to obtain a final alloy with the papillary structure. The microemulsion structure preparation process of this invention is simple, widely applicable, low-cost, and highly efficient, facilitating large-scale industrial production.

Description

[0001] This patent application claims priority to application number 202210855241.9, application date 20220720, and invention title "A papillary structure for improving the resistance of alloy to liquid zinc corrosion and its preparation method". Technical Field

[0002] This invention belongs to the technical field of liquid metal corrosion resistance, and relates to a papillary structure and its preparation method for improving the resistance of alloys to liquid zinc corrosion. Background Technology

[0003] Hot-dip galvanizing is considered an economical and effective method for corrosion protection of steel. However, liquid zinc (450-650℃) has a strong corrosive effect on metal equipment. Therefore, the galvanizing industry currently faces problems such as high zinc consumption and short equipment lifespan. Hot-dip galvanizing equipment (zinc pots, heating sleeves, submerged rollers, bearings, etc.) suffers severe corrosion in molten zinc, resulting in significant waste, greatly reducing production efficiency and product quality, and consequently increasing production costs. Therefore, improving the resistance of hot-dip galvanizing equipment to liquid zinc corrosion is a pressing issue for continuous hot-dip galvanizing production lines.

[0004] In recent years, research on materials resistant to liquid zinc corrosion has increased both domestically and internationally, and some progress has been made. Although materials such as stainless steel, Ni3Al, and cobalt-based alloys have certain corrosion resistance, they only slow down the corrosion rate in liquid zinc; moreover, some of these materials are inherently brittle, and some of the metallic elements they contain are expensive, making them unsuitable for industrial production.

[0005] Currently, the submerged rollers in continuous hot-dip galvanizing production lines generally use stainless steel substrates coated with WC-Co coatings. However, the lifespan of WC-Co coatings in liquid zinc is very short, with a corrosion lifespan of typically 1-2 weeks [Wang WJ, Lin JP, Wang YL, et al. Isothermal corrosion TiAl-N balloy in liquid zinc. Materials Science and Engineering: A, 2007, 452-453: 194-201].

[0006] The novel MoB-CoCr coating sprayed onto a stainless steel substrate exhibits good corrosion resistance in liquid zinc; compared with the traditional WC-Co coating, the MoB-CoCr coating has a corrosion resistance life of more than 25 days [Zhang JF, Deng CM, Song JB, et al. MoB-CoCr alternatives to WC-12Co for stainless steel protective coating and its corrosion behavior in molten zinc. Surface and Coatings Technology, 2013, 235: 811-818]. However, due to factors such as microcracks caused by thermal stress in the coating, poor bonding strength between the coating and the substrate, and thermal shock in the service environment, the coating is prone to peeling off, thereby accelerating material failure.

[0007] Chinese invention patent CN1804081A discloses that TiAl-Nb alloys have excellent resistance to liquid zinc corrosion over a fairly wide range of compositions; however, their corrosion life in liquid zinc is less than 100 days.

[0008] Chinese patent CN102418064A discloses a method for preparing a TiAl-Nb composite coating resistant to liquid zinc corrosion by supersonic spraying. The coating prepared by supersonic spraying has a corrosion life of less than 50 days in liquid zinc. Moreover, it requires the preparation of an adhesive layer on the substrate surface first, and then the coating is prepared. The preparation process is complicated, costly, and inefficient.

[0009] Chinese patent CN102352504A discloses a pretreatment method to improve the corrosion resistance of TiAl-Nb alloy in liquid zinc. The method involves sealing the TiAl-Nb alloy in a special quartz tube and then holding it at 900-1050℃ for 12-20 hours, thereby improving the alloy's corrosion resistance to liquid zinc. The corrosion life of Ti-45Al-8Nb alloy in liquid zinc is 85 days.

[0010] Clearly, none of the aforementioned existing technologies can be used for hot-dip galvanizing equipment materials. Not only are the preparation costs high and the corrosion life in liquid zinc low, but the overall mechanical properties of the material cannot be improved together with the resistance to liquid zinc corrosion. Furthermore, the coating has poor adhesion to the substrate and is prone to peeling off under thermal shock. Adding an adhesive layer would increase production costs and also result in a low corrosion life. Summary of the Invention

[0011] The technical problem to be solved by this invention is how to overcome the technical difficulty of low corrosion life of hot-dip galvanizing equipment materials in liquid zinc in the prior art, especially the problem of mismatch between the mechanical properties and liquid zinc corrosion resistance of hot-dip galvanizing equipment materials as integral materials, as well as the problems of poor adhesion to the substrate and low liquid zinc corrosion resistance faced in the preparation of coatings.

[0012] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0013] A papilla structure for improving the resistance of an alloy to liquid zinc corrosion, wherein the papilla structure is uniformly distributed on the alloy surface and the size of the papilla is 0.03-1 mm.

[0014] Preferably, the papillae structure is distributed in an array on the alloy surface, and the papillae size is 0.03-0.6 mm.

[0015] Preferably, the surface of the papillary structure has irregularly distributed micro- and nano-sized pores with a porosity of 40-60%.

[0016] Preferably, the liquid zinc corrosion resistance of the papillary structure is more than 6 times higher than that of the WC-Co coating and more than 4 times higher than that of the MoB-CoCr coating.

[0017] Preferably, the alloy is any one of TiAl-Nb alloy, 316L stainless steel, Stellite6 and TribaloyT-800 cobalt-based alloys, tungsten and molybdenum refractory alloys, WC-Co cemented carbide, and nickel-based alloy materials.

[0018] Preferably, the composition of the TiAl-Nb alloy, by mass percentage, is: Al 25-60%, Nb 10-25%, Y 0-1%, with the balance being Ti.

[0019] A method for preparing a nipple structure to improve the corrosion resistance of an alloy to liquid zinc, according to the above-mentioned method, involves preparing the nipple structure by two electrical discharge wire cutting operations on an alloy ingot; wherein: the first cutting is a transverse cutting of the alloy to obtain an initial alloy, and the second cutting is a radial cutting of the alloy after rotating the initial alloy by 90° to obtain a final alloy with a nipple structure.

[0020] Preferably, the alloy ingot is obtained by melting in a vacuum magnetic levitation melting furnace and then undergoing annealing heat treatment at 1250°C for 12 hours.

[0021] Preferably, the two wire electrical discharge machining (EDM) operations are performed with different cutting parameters on a high-speed wire EDM machine before preparing the papillary structure. These different cutting parameters include using a cutting wire diameter of 0.06-0.3 mm and a cutting speed of 20-250 mm / s. 2 / min, servo voltage is 2-48V, pulse width gap is 1-32μs, discharge current is 1-10A.

[0022] Preferably, the cutting depth of the first and second cuts is 0.03-1.2 mm.

[0023] Preferably, after the final alloy with the papillary structure is cut, it is ultrasonically cleaned in acetone solution for 5-15 minutes, then rinsed with water, ultrasonically cleaned in ethanol solution for 5-15 minutes, and finally dried with a hair dryer for later use.

[0024] Preferably, the final alloy with the papillary structure is placed in a graphite crucible containing liquid zinc with a mass fraction of 2% aluminum, and subjected to a static isothermal corrosion test at 460°C in a pit-type heating furnace. The corrosion life of the alloy with the papillary structure in liquid zinc is 20-35 days longer than that of the alloy without the papillary structure.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] In the above scheme, the present invention is based on the fact that the corrosion resistance of TiAl-Nb alloy is related to its surface state. Therefore, its surface structure is adjusted. Through repeated exploration of many experiments and theories, it was finally concluded that the corrosion resistance of TiAl-Nb alloy to liquid zinc can be further improved by preparing papillary structures. This research has important guiding significance and application value. At present, there are no relevant reports at home and abroad.

[0027] The papillary structure and its preparation method for improving the resistance of TiAl-Nb alloy to liquid zinc corrosion in this invention are not only applicable to TiAl-Nb alloys, but also to materials such as stainless steel such as 316L, cobalt-based alloys such as Stellite 6 and Tribaloy T-800, refractory alloys such as tungsten and molybdenum, hard alloys such as WC-Co, and nickel-based alloys.

[0028] This invention utilizes a papillary structure to improve the resistance of TiAl-Nb alloy to liquid zinc corrosion. The papillary structures are uniformly distributed with a size of 0.03-1 mm. The preparation process of the papillary structure is simple, and the liquid zinc corrosion resistance is significant, solving the problem of poor corrosion resistance of previous materials.

[0029] The alloy surface microemulsion structure preparation process of the present invention is simple, has a wide range of applications, is low in cost, and is highly efficient, which is conducive to large-scale industrial production. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 The image shows the microstructure of the papillary structure used in Example 1 of this invention to improve the resistance of an alloy to liquid zinc corrosion.

[0032] Figure 2 The macroscopic morphology of the papillary structure prepared in Example 1 of the present invention to improve the corrosion resistance of alloy to liquid zinc after immersion in liquid zinc for 120 days is shown.

[0033] Figure 3 The microscopic cross-sectional morphology of the papillary structure prepared in Example 1 of the present invention to improve the corrosion resistance of alloy to liquid zinc after immersion in liquid zinc for 154 days;

[0034] Figure 4 This is a comparison of the liquid zinc corrosion resistance lifetimes of the papillary structure, WC-Co coating, and MoB-CoCr coating prepared in Example 1 of the present invention to improve the liquid zinc corrosion resistance of the alloy. Detailed Implementation

[0035] The technical solutions and problems solved by the embodiments of the present invention will be described below with reference to the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them.

[0036] Example 1

[0037] The alloy used in the experiment had a nominal composition of 28.15Ti-63.4Al-8.25Nb-0.2Y (atomic percentage). The ingot was obtained by melting in a vacuum magnetic levitation melting furnace and then annealed at 1250℃ for 12 hours. The surface of the 28.15Ti-63.4Al-8.25Nb-0.2Y alloy was cut using a high-speed wire EDM machine with a wire diameter of 0.18 mm and a cutting speed of 80 mm / s. 2 The servo voltage was 32V, the pulse gap was 6μs, the discharge current was 2A, and the cutting size and depth of the papilla were set to 0.2mm. First, a transverse cut was made of the 28.15Ti-63.4Al-8.25Nb-0.2Y alloy. Then, the 28.15Ti-63.4Al-8.25Nb-0.2Y alloy was rotated 90° and radially cut to obtain a sample with a papilla structure. The papilla structure is as follows: Figure 1As shown, the papillary structures are arranged in an array, and the surface of the structures has irregularly distributed micro- and nano-sized pores with a porosity of 52%.

[0038] The samples were placed in a graphite crucible containing liquid zinc (containing 0.2% aluminum by mass) and subjected to isothermal (460℃) static corrosion testing in a pit furnace. The samples were removed every 2-5 days to observe the surface morphology. After immersion in liquid zinc for 120 days, the sample structure remained intact, showing no signs of corrosion from the liquid zinc. Figure 2 As shown, although liquid zinc adheres to the sample surface, the zinc adhering to the surface automatically detaches when the sample is gently shaken, indicating very poor wettability between the sample surface and the liquid zinc.

[0039] The liquid zinc corrosion lifetime of the 28.15Ti-63.4Al-8.25Nb-0.2Y alloy sample with a papillary structure was 154 days. Figure 3 As shown, its corrosion life is significantly improved compared to WC-Co coating and MoB-CoCr coating, such as Figure 4 As shown, the papilla structure significantly improves the corrosion life of the sample in liquid zinc. The corrosion life of the 28.15Ti-63.4Al-8.25Nb-0.2Y alloy with the papilla structure is more than 10 times longer than that of the WC-Co coating, more than 4 times longer than that of the MoB-CoCr coating, and more than 33 days longer than that of the 28.15Ti-63.4Al-8.25Nb-0.2Y alloy without the papilla structure.

[0040] Example 2

[0041] The alloy used in the experiment had a nominal composition of 47Ti-45Al-8Nb (atomic percentage). The ingot was obtained by melting in a vacuum magnetic levitation melting furnace and then annealed at 1250℃ for 12 hours. The 47Ti-45Al-8Nb alloy surface was cut using a high-speed wire EDM machine with a wire diameter of 0.2 mm and a cutting speed of 40 mm / s. 2 The parameters were set as follows: servo voltage: 16V; pulse width interval: 4μs; discharge current: 1A; cutting papilla size: 0.5mm; cutting depth: 0.2mm; first, the 47Ti-45Al-8Nb alloy was cut laterally, then the 47Ti-45Al-8Nb alloy was rotated 90° and cut radially to obtain a sample with a papilla structure. The papilla structure was distributed in an array, and the surface of the papilla structure had irregularly distributed micro-nano pores with a porosity of 55%.

[0042] The samples were placed in a graphite crucible containing liquid zinc (containing 0.2% aluminum by mass) and subjected to isothermal (460℃) static corrosion experiments in a pit furnace. The samples were removed every 2-5 days to observe the surface morphology. After immersion in liquid zinc for 80 days, the sample structure remained intact, showing no signs of corrosion. Although some liquid zinc adhered to the sample surface, it detached automatically with gentle shaking, indicating poor wettability between the sample surface and the liquid zinc.

[0043] The liquid zinc corrosion life of the 47Ti-45Al-8Nb alloy sample with a papillary structure was 102 days. The papillary structure significantly improved the liquid zinc corrosion life of the sample. The corrosion life of the 47Ti-45Al-8Nb alloy with the papillary structure in liquid zinc was more than 6 times that of the WC-Co coating, more than 3 times that of the MoB-CoCr coating, and 30 days that of the 47Ti-45Al-8Nb alloy without the papillary structure.

[0044] Example 3

[0045] The alloy used in the experiment was 17Ti-75Al-8Nb (atomic percentage), obtained by melting ingots in a vacuum magnetic levitation melting furnace and then annealing at 1250℃ for 12 hours. The surface of the 17Ti-75Al-8Nb alloy was cut using a high-speed wire EDM machine with a wire diameter of 0.1 mm and a cutting speed of 80 mm / s. 2 The parameters were set as follows: servo voltage: 32V; pulse width interval: 16μs; discharge current: 4A; cutting papilla size: 0.3mm; cutting depth: 0.2mm; first, the 17Ti-75Al-8Nb alloy was cut laterally, then the 17Ti-75Al-8Nb alloy was rotated 90° and cut radially to obtain a sample with a papilla structure. The papilla structure was distributed in an array, and the surface of the papilla structure had irregularly distributed micro-nano pores with a porosity of 44%.

[0046] The samples were placed in a graphite crucible containing liquid zinc (containing 0.2% aluminum by mass) and subjected to isothermal (460℃) static corrosion experiments in a pit furnace. The samples were removed every 2-5 days to observe the surface morphology. After immersion in liquid zinc for 170 days, the sample structure remained intact, showing no signs of corrosion. Although some liquid zinc adhered to the sample surface, it detached automatically with gentle shaking, indicating poor wettability between the sample surface and the liquid zinc.

[0047] The 17Ti-75Al-8Nb alloy sample with a papillary structure exhibited a liquid zinc corrosion life of 205 days. The papillary structure significantly improved the sample's resistance to liquid zinc corrosion. The 17Ti-75Al-8Nb alloy with the papillary structure had a corrosion life in liquid zinc that was more than 13 times longer than that of the WC-Co coating, more than 7 times longer than that of the MoB-CoCr coating, and 35 days longer than that of the 17Ti-75Al-8Nb alloy without the papillary structure.

[0048] Example 4

[0049] The alloy used in the experiment was commercially available 316L stainless steel. A high-speed wire EDM machine was used to cut the surface of the 316L stainless steel, with a wire diameter of 0.2 mm and a cutting speed of 60 mm / s. 2 The parameters were set as follows: servo voltage: 16V; pulse width interval: 8μs; discharge current: 2A; cutting size of the papillae: 0.1mm; cutting depth: 0.2mm. First, 316L stainless steel was cut laterally. Then, the 316L stainless steel was rotated 90° and cut radially to obtain a sample with a papillae structure. The papillae structure was distributed in an array, and the surface of the papillae structure had irregularly distributed micro / nano-scale pores with a porosity of 50%.

[0050] The samples were placed in a graphite crucible containing liquid zinc (containing 0.2% aluminum by mass) and subjected to isothermal (460℃) static corrosion experiments in a pit furnace. The samples were removed every 2-5 days to observe the surface morphology. After immersion in liquid zinc for 10 days, the sample structure remained intact, showing no signs of corrosion. Although some liquid zinc adhered to the sample surface, it detached automatically with gentle shaking, indicating poor wettability between the sample surface and the liquid zinc.

[0051] The 316L stainless steel sample with a papilla structure had a liquid zinc corrosion life of 21 days. The papilla structure significantly improved the sample's resistance to liquid zinc corrosion. The 316L stainless steel with the papilla structure had a corrosion life in liquid zinc that was more than 20 days longer than that without the papilla structure.

[0052] Example 5

[0053] The alloy used in the experiment was commercially available Stellite 6. A high-speed wire EDM machine was used to cut the surface of the Stellite 6, with a wire diameter of 0.18 mm and a cutting speed of 80 mm / s. 2The servo voltage was 24V, the pulse gap was 12μs, the discharge current was 4A, the cut papillary size was set to 0.2mm, and the cut depth was 0.2mm. First, Stellite6 was cut laterally, and then Stellite6 was rotated 90° and cut radially to obtain a sample with a papillary structure. The papillary structure was distributed in an array, and the surface of the papillary structure had irregularly distributed micro-nano pores with a porosity of 53%.

[0054] The samples were placed in a graphite crucible containing liquid zinc (containing 0.2% aluminum by mass) and subjected to isothermal (460℃) static corrosion experiments in a pit furnace. The samples were removed every 2-5 days to observe the surface morphology. After immersion in liquid zinc for 15 days, the sample structure remained intact, showing no signs of corrosion. Although some liquid zinc adhered to the sample surface, it detached automatically with gentle shaking, indicating poor wettability between the sample surface and the liquid zinc.

[0055] The room-temperature Stellite6 sample with a papillary structure exhibited a liquid zinc corrosion lifetime of 29 days. The papillary structure significantly improved the sample's resistance to liquid zinc corrosion. The room-temperature Stellite6 sample with the papillary structure had a corrosion lifetime in liquid zinc that was 24 days longer than the room-temperature Stellite6 sample without the papillary structure.

[0056] Example 6

[0057] The alloy used in the experiment was commercially available Tribaloy T-800. A high-speed wire EDM machine was used to cut the surface of Tribaloy T-800, with a wire diameter of 0.1 mm and a cutting speed of 60 mm / s. 2 The parameters were set as follows: servo voltage: 16V; pulse width interval: 32μs; discharge current: 4A; cut size: 0.4mm; cut depth: 0.2mm; first, the Tribaloy T-800 was cut laterally, then the Tribaloy T-800 was rotated 90° and cut radially to obtain a sample with a papillary structure. The papillary structure was distributed in an array, and the surface of the papillary structure had irregularly distributed micro-nano pores with a porosity of 52%.

[0058] The samples were placed in a graphite crucible containing liquid zinc (containing 0.2% aluminum by mass) and subjected to isothermal (460℃) static corrosion experiments in a pit furnace. The samples were removed every 2-5 days to observe the surface morphology. After immersion in liquid zinc for 30 days, the sample structure remained intact, showing no signs of corrosion. Although some liquid zinc adhered to the sample surface, it detached automatically with gentle shaking, indicating poor wettability between the sample surface and the liquid zinc.

[0059] The room-temperature Tribaloy T-800 sample with a papillary structure exhibited a liquid zinc corrosion life of 35 days. The papillary structure significantly improved the sample's resistance to liquid zinc corrosion. The room-temperature Tribaloy T-800 with the papillary structure had a corrosion life in liquid zinc that was 28 days longer than the room-temperature Tribaloy T-800 without the papillary structure.

[0060] In the above scheme, the present invention is based on the fact that the corrosion resistance of TiAl-Nb alloy is related to its surface state. Therefore, its surface structure is adjusted. Through repeated exploration of many experiments and theories, it was finally concluded that the corrosion resistance of TiAl-Nb alloy to liquid zinc can be further improved by preparing papillary structures. This research has important guiding significance and application value. At present, there are no relevant reports at home and abroad.

[0061] The papillary structure and its preparation method for improving the resistance of TiAl-Nb alloy to liquid zinc corrosion in this invention are not only applicable to TiAl-Nb alloys, but also to materials such as stainless steel such as 316L, cobalt-based alloys such as Stellite 6 and Tribaloy T-800, refractory alloys such as tungsten and molybdenum, hard alloys such as WC-Co, and nickel-based alloys.

[0062] This invention utilizes a papillary structure to improve the resistance of TiAl-Nb alloy to liquid zinc corrosion. The papillary structures are uniformly distributed with a size of 0.03-1 mm. The preparation process of the papillary structure is simple, and the liquid zinc corrosion resistance is significant, solving the problem of poor corrosion resistance of previous materials.

[0063] The alloy surface microemulsion structure preparation process of the present invention is simple, has a wide range of applications, is low in cost, and is highly efficient, which is conducive to large-scale industrial production.

[0064] The above-described method for preparing the papillary structure of the present invention by wire electrical discharge machining is only one method. The methods for preparing the papillary structure of the present invention are not limited to the above-described methods such as wire electrical discharge machining, laser texturing, laser shock peening, and shot peening.

[0065] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A papillary structure for improving the resistance of an alloy to corrosion by liquid zinc, characterized in that, The papillary structure is uniformly distributed on the alloy surface, and the papillary size is 0.03-1mm.

2. The nodule structure for improving the corrosion resistance of an alloy against liquid zinc according to claim 1, characterized by, The papillary structure is arrayed on the alloy surface, and the papillary size is 0.03-0.6mm.

3. The nodule structure for improving the corrosion resistance of an alloy against liquid zinc according to claim 1, wherein Irregularly distributed micropores in the nanometer level exist on the surface of the papillary structure, and the porosity is 40-60%.

4. The nodule structure for improving the corrosion resistance of an alloy against liquid zinc according to claim 1, wherein The liquid zinc corrosion performance of the papillary structure is improved by more than 6 times compared with the WC-Co coating and more than 4 times compared with the MoB-CoCr coating.

5. The nodule structure for improving the corrosion resistance of an alloy against liquid zinc according to claim 1, wherein The alloy is any one of TiAl-Nb alloy, 316L stainless steel, Stellite 6 cobalt-based alloy, Tribaloy T-800 cobalt-based alloy, refractory tungsten and molybdenum alloy, WC-Co hard alloy and nickel-based alloy material.

6. The nodule structure for improving the corrosion resistance of an alloy against liquid zinc according to claim 5, wherein The TiAl-Nb alloy comprises, by mass percentage, Al 25-60%, Nb 10-25%, Y 0-1%, and the balance of Ti.

7. A method of producing a papillary structure for improving the corrosion resistance of an alloy against liquid zinc according to any one of claims 1 to 6, characterized by, The papillary structure improving the liquid zinc corrosion performance of the alloy ingot is prepared by twice wire electrical discharge machining; wherein: the first cutting is transverse cutting of the alloy to obtain an initial alloy, and the second cutting is radial cutting of the initial alloy rotated by 90° to obtain the final alloy with the papillary structure.

8. The method of claim 7, wherein the method is characterized by: The two times of wire electrical discharge machining set different cutting parameters of the high-speed wire electrical discharge machining machine before preparing the papillary structure, the different cutting parameters include using the cutting wire diameter of 0.06-0.3mm, the cutting speed of 20-250mm / min, the servo voltage of 2-48V, the pulse width gap of 1-32μs and the discharge current of 1-10A. 2 / min, the servo voltage of 2-48V, the pulse width gap of 1-32μs and the discharge current of 1-10A.

9. The method of claim 7, wherein the method is characterized by: The cutting depth of the first cutting and the second cutting is 0.03-1.2mm.

10. The method of claim 7, wherein the method is characterized by: The final alloy with the papillary structure is placed in a graphite crucible containing liquid zinc containing 2% mass fraction of aluminum, and an isothermal static corrosion experiment is carried out in a shaft furnace at 460℃, and the corrosion life of the final alloy with the papillary structure in the liquid zinc is improved by 20-35 days compared with the alloy without the papillary structure.

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