A composite system for enhancing corrosion resistance of high entropy alloys and methods of use thereof

Abstract

The application discloses a composite system for enhancing corrosion resistance of high-entropy alloy and a use method thereof, and relates to the technical field of high-entropy alloy processing. The heat treatment device, the oxidation treatment device and the laser cleaning treatment device are connected with the control panel respectively, so that the temperature, oxidation and laser action of the high-entropy alloy in the processing process can be effectively controlled; the heat field action can accelerate the diffusion of high-entropy alloy elements to obtain more uniform component distribution; the oxidation can quickly generate an oxide protective film on the surface of the high-entropy alloy to isolate corrosion; and the laser cleaning can adjust the surface and interface structure of the high-entropy alloy and help to eliminate surface and internal defects. Through the heat field action, the oxidation and the laser action, the synergistic effect among processes, the corrosion resistance of the high-entropy alloy can be significantly improved, the three-dimensional and comprehensive improvement of the corrosion resistance is realized, and the high-entropy alloy has a wider application space and application value.

Description

Technical Field

[0001] This invention relates to the field of materials preparation, and more specifically, to a composite system for enhancing the corrosion resistance of high-entropy alloys and its application method. Background Technology

[0002] High-entropy alloys (HEAs) have a wide range of applications in corrosion resistance. These special alloys are composed of near-equimolar proportions and possess unique atomic arrangements and microstructures. HEAs exhibit excellent resistance to oxidation and high-temperature corrosion in high-temperature environments, resisting erosion by various corrosive media such as oxidation, sulfidation, and chlorination. Therefore, they are attracting significant attention in high-temperature applications such as aerospace, energy, and petrochemicals. Furthermore, HEAs demonstrate excellent resistance to acid and alkali corrosion, resisting the erosion of strong acids and alkalis, making them promising for applications in chemical industries and acid-base environments. In seawater environments, HEAs resist chloride ion erosion, marine corrosion, and seawater corrosion fatigue, thus showing broad application prospects in marine engineering and offshore structures. In addition, HEAs possess excellent abrasion resistance, resisting erosion and wear from abrasive media, thus showing potential application value in mineral processing, hydraulic equipment, and friction materials. In summary, the superior corrosion resistance of HEAs makes them a highly sought-after material choice in multiple industrial sectors.

[0003] High-entropy alloys are composed of multiple elements, and their complex atomic arrangement and microstructure give them excellent corrosion resistance. However, this also increases the difficulty of alloy preparation and processing. Specifically, the interactions and atomic arrangements between different elements in high-entropy alloys affect their corrosion resistance and require precise control. Furthermore, research has found that increasing the Al content in high-entropy alloys reduces their localized corrosion resistance. Excessive Al leads to uneven passivation films, thus affecting corrosion resistance. Therefore, a trade-off between Al content and corrosion resistance is necessary when designing high-entropy alloys. Although high-entropy alloys produce fewer microscopic defects, a certain number of defects still exist, which can affect corrosion resistance. Therefore, material purity and defect control are crucial during the preparation and application of high-entropy alloys. In summary, the corrosion resistance of high-entropy alloys is influenced by their complex composition, Al content, and the presence of microscopic defects, requiring comprehensive consideration and corresponding control and optimization in application. Consequently, existing technologies suffer from low efficiency, poor forming results, and the tendency to generate defects such as porosity, cracks, and uneven chemical composition during the forming process. Summary of the Invention

[0004] Therefore, to address the problems of low efficiency, poor forming effect, and easy generation of porosity, cracks, and uneven chemical composition in the preparation of high-entropy alloys in existing technologies, this invention provides a composite system for enhancing the corrosion resistance of high-entropy alloys and its application method. The specific technical solution is as follows:

[0005] A composite system for enhancing the corrosion resistance of high-entropy alloys, the composite system comprising a shell, a control panel 2, a heat treatment device, an oxidation treatment device, and a laser cleaning treatment device installed inside the shell, wherein the heat treatment device, the oxidation treatment device, and the laser cleaning treatment device are respectively connected to the control panel 2;

[0006] The heat treatment device is used for thermal field action, the oxidation treatment device is used for oxidation action, and the laser cleaning treatment device is used for laser action.

[0007] Furthermore, the heat treatment apparatus includes a heating device 3 and a heating plate 4, wherein the heating device 3 is connected to the heating plate 4 and the heating device 3 is connected to the control panel 2.

[0008] Furthermore, the oxidation treatment device includes an oxidation tank 5 and an oxidant storage tank 6, and the oxidation tank 5 abuts against the heating plate 4 and is located above the heating plate 4.

[0009] Furthermore, the oxidant storage tank 6 is connected to the control panel 2 and communicates with the oxidation tank 5.

[0010] Furthermore, the laser cleaning device includes a laser head 7 and an air tank 8. The laser head 7 is connected to the control panel 2, and the laser head 7 and the air tank 8 are respectively connected to the control panel 2.

[0011] Furthermore, the housing 1 is also provided with an exhaust device 11, and the exhaust device 11 enables communication between the inside and outside of the housing 1.

[0012] Furthermore, the housing 1 is also provided with a base 10 and a temperature monitoring device 12. The base 10 is disposed on the oxidation tank 5 and abuts against the oxidation tank 5. The temperature monitoring device 12 is disposed on the oxidation tank 5 and connected to the control panel 2 for detecting the temperature of the oxidation tank 5.

[0013] In addition, this application also provides a method of using a composite system, the method comprising the following steps:

[0014] The high-entropy alloy sample 13 is placed on the base 10 and fixed.

[0015] Check if the composite system is operating normally;

[0016] The protective gas in the gas storage tank 8 is discharged through the control panel 2, and the first laser action is performed under the action of the protective gas, and the horizontal and vertical orthogonal scans are performed several times.

[0017] Adjust the height of the oxidation tank 5 using the control panel 2 so that the edge of the oxidation tank 5 is at least 10 mm higher than the high-entropy alloy sample 13.

[0018] The oxidant is injected into the oxidation tank 5 by the oxidant storage tank 6 through the control panel 2, so that the oxidant immerses the high entropy alloy sample 13 and is at least 2 mm above it;

[0019] The heating device 3 is controlled by the control panel 2 to heat the oxidant in the oxidation tank 5 through the heating plate 4. When the temperature detection device 12 detects that the temperature of the oxidant has reached the set temperature, after heat preservation treatment, the control panel 2 controls the heating plate to stop heating.

[0020] The protective gas in the gas storage tank 8 is discharged through the control panel 2. Under the action of the protective gas, a second laser action is performed, and several horizontal and vertical orthogonal scans are performed to obtain a high-entropy alloy with strong corrosion resistance.

[0021] Furthermore, the power of the first laser action is 35W to 45W, and the scanning speed is 2200mm / s to 2300mm / s.

[0022] Furthermore, the protective gas is argon, and the emission rate of the argon is 10L / min to 18L / min.

[0023] Furthermore, the set temperature is 480℃~520℃.

[0024] In the above scheme, the heat treatment device, oxidation treatment device, and laser cleaning treatment device are respectively connected to the control panel, which can effectively control the temperature, oxidation, and laser effects during the processing of high-entropy alloys. The heat treatment device is used for thermal field effects, the oxidation treatment device is used for oxidation, and the laser cleaning treatment device is used for laser effects. The thermal field effect can accelerate the diffusion of elements in the high-entropy alloy to obtain a more uniform composition distribution; the oxidation effect can quickly generate a corrosion-resistant oxide protective film on the surface of the high-entropy alloy; and the laser cleaning can adjust the surface and interface structure of the high-entropy alloy, helping to eliminate surface and internal defects. Through the synergistic effect of thermal field effects, oxidation effects, and laser effects, the corrosion resistance of high-entropy alloys can be significantly improved, achieving a three-dimensional and comprehensive improvement in corrosion resistance, thus giving it a wider range of applications and value. Attached Figure Description

[0025] Figure 1This is a schematic diagram of the structure of a composite system for enhancing the corrosion resistance of high-entropy alloys according to the present invention;

[0026] Figure 2 This is a schematic diagram of the polarization curves of the high-entropy alloys of Example 3, Comparative Example 1, and blank control. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to its embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of protection of the invention.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] A composite system for enhancing the corrosion resistance of high-entropy alloys according to one embodiment of the present invention includes a shell, a control panel, a heat treatment device, an oxidation treatment device, and a laser cleaning treatment device installed inside the shell, wherein the heat treatment device, the oxidation treatment device, and the laser cleaning treatment device are respectively connected to the control panel.

[0030] The heat treatment device is used for thermal field action, the oxidation treatment device is used for oxidation action, and the laser cleaning treatment device is used for laser action.

[0031] In one embodiment, the heat treatment apparatus includes a heating device 3 and a heating plate 4, wherein the heating device 3 is connected to the heating plate 4 and the heating device 3 is connected to the control panel 2.

[0032] In one embodiment, the oxidation treatment device includes an oxidation tank 5 and an oxidant storage tank 6, wherein the oxidation tank 5 abuts against the heating plate 4 and is located above the heating plate 4; the oxidant storage tank 6 is connected to the control panel 2 and communicates with the oxidation tank 5.

[0033] In one embodiment, the laser cleaning device includes a laser head 7 and an air tank 8. The laser head 7 is connected to the control panel 2, and the laser head 7 and the air tank 8 are respectively connected to the control panel 2.

[0034] In one embodiment, the housing is further provided with an exhaust device 11, and the exhaust device 11 enables communication between the inside and outside of the housing 1.

[0035] In one embodiment, the housing 1 is further provided with a base 10 and a temperature monitoring device 12. The base 10 is disposed on the oxidation tank 5 and abuts against the oxidation tank 5. The temperature monitoring device 12 is disposed on the oxidation tank 5 and connected to the control panel 2 for detecting the temperature of the oxidation tank 5.

[0036] In addition, this application also provides a method of using a composite system, the method comprising the following steps:

[0037] The high-entropy alloy sample 13 is placed on the base 10 and fixed.

[0038] Check if the composite system is operating normally;

[0039] The protective gas in the gas storage tank 8 is discharged through the control panel 2, and the first laser action is performed under the action of the protective gas, and the horizontal and vertical orthogonal scans are performed several times.

[0040] Adjust the height of the oxidation tank 5 using the control panel 2 so that the edge of the oxidation tank 5 is at least 10 mm higher than the high-entropy alloy sample 13.

[0041] The oxidant is injected into the oxidation tank 5 by the oxidant storage tank 6 through the control panel 2, so that the oxidant immerses the high entropy alloy sample 13 and is at least 2 mm above it;

[0042] The heating device 3 is controlled by the control panel 2 to heat the oxidant in the oxidation tank 5 through the heating plate 4. When the temperature detection device 12 detects that the temperature of the oxidant has reached the set temperature, after heat preservation treatment, the control panel 2 controls the heating plate to stop heating.

[0043] The protective gas in the gas storage tank 8 is discharged through the control panel 2. Under the action of the protective gas, a second laser action is performed, and several horizontal and vertical orthogonal scans are performed to obtain a high-entropy alloy with strong corrosion resistance.

[0044] In one embodiment, the power of the first laser application is 35W to 45W, and the scanning speed is 2200mm / s to 2300mm / s.

[0045] In one embodiment, the protective gas is argon, and the argon emission rate is 10 L / min to 18 L / min.

[0046] In one embodiment, the set temperature is 480°C to 520°C.

[0047] In one embodiment, the heat preservation treatment time is 5 min to 10 min.

[0048] In one embodiment, the power of the second laser action is 35W to 45W, and the scanning speed is 2200mm / s to 2300mm / s.

[0049] In one embodiment, the oxidant comprises, by weight, 6 to 9 parts ferric chloride, 20 to 30 parts sodium nitrate, 1 to 5 parts zinc powder, 8 to 12 parts ferric hydroxide, 15 to 20 parts potassium nitrate, and 20 to 25 parts water.

[0050] In one embodiment, the preparation method of the oxidant includes the following steps: adding 6 to 9 parts of ferric chloride, 20 to 30 parts of sodium nitrate, 1 to 5 parts of zinc powder, 8 to 12 parts of ferric hydroxyoxide, 15 to 20 parts of potassium nitrate, and 20 to 25 parts of water to a mixing vessel, stirring evenly and reacting to obtain the oxidant.

[0051] In the above scheme, the heat treatment device, oxidation treatment device, and laser cleaning treatment device are respectively connected to the control panel, which can effectively control the temperature, oxidation, and laser effects during the processing of high-entropy alloys. The heat treatment device is used for thermal field effects, the oxidation treatment device is used for oxidation, and the laser cleaning treatment device is used for laser effects. The thermal field effect can accelerate the diffusion of elements in the high-entropy alloy to obtain a more uniform composition distribution; the oxidation effect can quickly generate a corrosion-resistant oxide protective film on the surface of the high-entropy alloy; and the laser cleaning can adjust the surface and interface structure of the high-entropy alloy, helping to eliminate surface and internal defects. Through the synergistic effect of thermal field effects, oxidation effects, and laser effects, the corrosion resistance of high-entropy alloys can be significantly improved, achieving a three-dimensional and comprehensive improvement in corrosion resistance, thus giving it a wider range of applications and value.

[0052] The implementation schemes of the present invention will now be described in detail with reference to specific embodiments.

[0053] Example 1:

[0054] A method of using a composite system for enhancing the corrosion resistance of high-entropy alloys includes the following steps:

[0055] The AlCoCrFeNi high-entropy alloy sample 13 was placed on the base 10 and fixed.

[0056] Check if the composite system is operating normally;

[0057] The protective gas in the gas storage tank 8 is discharged through the control panel 2. Under the action of argon, the laser head 7 performs the first laser action with a power of 40W, a scanning speed of 2240mm / s, an argon flow rate of 16L / min, and two horizontal and vertical orthogonal scans. The gas is regulated by the exhaust device 11.

[0058] Adjust the height of the oxidation tank 5 using the control panel 2 so that the edge of the oxidation tank 5 is 10 mm higher than the high-entropy alloy sample.

[0059] The oxidant is injected into the oxidation tank 5 by the oxidant storage tank 6 through the control panel 2, so that the oxidant immerses the high-entropy alloy sample by 2 mm.

[0060] The heating plate 3 is controlled by the control panel 2 to heat the oxidant in the oxidation tank 5 through the heat transfer of the heating device 4. When the temperature detection device 12 detects that the temperature of the oxidant has reached the set 500°C, after heat preservation for 10 minutes, the control panel 2 controls the heating plate 3 to stop heating.

[0061] The protective gas in the gas storage tank 8 is discharged through the control panel 2. Under the action of argon, the laser head 7 performs a second laser action with a laser power of 40W, a scanning speed of 2240mm / s, and an argon flow rate of 16L / min. After several horizontal and vertical orthogonal scans, a high-entropy alloy with strong corrosion resistance is obtained.

[0062] It should be noted that the oxidant in Example 1 is: 9 parts of ferric chloride, 30 parts of sodium nitrate, 5 parts of zinc powder, 10 parts of ferric hydroxide, 18 parts of potassium nitrate, and 25 parts of water are added to a mixing vessel, stirred evenly, and reacted to obtain the oxidant.

[0063] Example 2:

[0064] A method of using a composite system for enhancing the corrosion resistance of high-entropy alloys includes the following steps:

[0065] The AlCoCrFeNi high-entropy alloy sample 13 was placed on the base 10 and fixed.

[0066] Check if the composite system is operating normally;

[0067] The protective gas in the gas storage tank 8 is discharged through the control panel 2. Under the action of argon, the laser head 7 performs the first laser action with a power of 42W, a scanning speed of 2250mm / s, an argon flow rate of 15L / min, and two horizontal and vertical orthogonal scans. The gas is regulated by the exhaust device 11.

[0068] Adjust the height of the oxidation tank 5 using the control panel 2 so that the edge of the oxidation tank 5 is 10 mm higher than the high-entropy alloy sample.

[0069] The oxidant is injected into the oxidation tank 5 by the oxidant storage tank 6 through the control panel 2, so that the oxidant immerses the high-entropy alloy sample by 2 mm.

[0070] The heating plate 3 is controlled by the control panel 2 to heat the oxidant in the oxidation tank 5 through the heat transfer of the heating device 4. When the temperature detection device 12 detects that the temperature of the oxidant has reached the set 510°C, after heat preservation for 8 minutes, the control panel 2 controls the heating plate 3 to stop heating.

[0071] The protective gas in the gas storage tank 8 is discharged through the control panel 2. Under the action of argon, the laser head 7 performs a second laser action with a laser power of 40W, a scanning speed of 2240mm / s, and an argon flow rate of 18L / min. After several horizontal and vertical orthogonal scans, a high-entropy alloy with strong corrosion resistance is obtained.

[0072] It should be noted that the oxidant in Example 2 is: 8 parts of ferric chloride, 28 parts of sodium nitrate, 4 parts of zinc powder, 10 parts of ferric hydroxide, 15 parts of potassium nitrate and 25 parts of water are added to a mixing vessel, stirred evenly and reacted to obtain the oxidant.

[0073] Example 3:

[0074] A method of using a composite system for enhancing the corrosion resistance of high-entropy alloys includes the following steps:

[0075] The AlCoCrFeNi high-entropy alloy sample 13 was placed on the base 10 and fixed.

[0076] Check if the composite system is operating normally;

[0077] The protective gas in the gas storage tank 8 is discharged through the control panel 2. Under the action of argon, the laser head 7 performs the first laser action with a power of 45W, a scanning speed of 2240mm / s, an argon flow rate of 15L / min, and two horizontal and vertical orthogonal scans. The gas is regulated by the exhaust device 11.

[0078] Adjust the height of the oxidation tank 5 using the control panel 2 so that the edge of the oxidation tank 5 is 10 mm higher than the high-entropy alloy sample.

[0079] The oxidant is injected into the oxidation tank 5 by the oxidant storage tank 6 through the control panel 2, so that the oxidant immerses the high-entropy alloy sample by 2 mm.

[0080] The heating plate 3 is controlled by the control panel 2 to heat the oxidant in the oxidation tank 5 through the heat transfer of the heating device 4. When the temperature detection device 12 detects that the temperature of the oxidant has reached the set 500°C, after heat preservation for 10 minutes, the control panel 2 controls the heating plate 3 to stop heating.

[0081] The protective gas in the gas storage tank 8 is discharged through the control panel 2. Under the action of argon, the laser head 7 performs a second laser action with a laser power of 45W, a scanning speed of 2250mm / s, and an argon flow rate of 18L / min. After several horizontal and vertical orthogonal scans, a high-entropy alloy with strong corrosion resistance is obtained.

[0082] It should be noted that the oxidant in Example 3 is: 9 parts of ferric chloride, 25 parts of sodium nitrate, 5 parts of zinc powder, 12 parts of ferric hydroxide, 20 parts of potassium nitrate, and 25 parts of water are added to a mixing vessel, stirred evenly, and reacted to obtain the oxidant.

[0083] Comparative Example 1:

[0084] The difference between Comparative Example 1 and Example 3 is that Comparative Example 1 was not subjected to laser treatment, while the rest is the same as Example 3.

[0085] Comparative Example 2:

[0086] The difference between Comparative Example 2 and Example 3 is that Comparative Example 2 did not undergo heating treatment with a heating plate, that is, the oxidant was at room temperature, while the rest was the same as Example 3.

[0087] Comparative Example 3:

[0088] The difference between Comparative Example 3 and Example 3 is that Comparative Example 3 was not treated with an oxidant, but otherwise it was the same as Example 3.

[0089] Comparative Example 4:

[0090] The difference between Comparative Example 4 and Example 3 is that the composition of the oxidant in Comparative Example 4 is different, while the rest is the same as in Example 3.

[0091] Comparative Example 4 used only a single conventional oxidant, specifically potassium permanganate with a mass percentage concentration of 15%.

[0092] The polarization curve data of Examples 1-3 and Comparative Examples 1-4 are shown in Table 1 below.

[0093] Table 1:

[0094]

[0095] Figure 2 The polarization curves of the high-entropy alloys in Example 3, Comparative Example 1, and the blank control are shown below.Figure 2 As can be seen from Table 1, the higher the self-corrosion potential, the better the corrosion resistance of the material; similarly, the higher the passivation potential, the better the corrosion resistance. Combined with Table 1, it can be seen that after thermal field treatment + strong oxidation + laser cleaning (Example 3), the high-entropy alloy has the highest self-corrosion potential and passivation potential, indicating the best corrosion resistance. The blank control has lower self-corrosion potential and passivation potential, indicating the worst corrosion resistance. The sample treated with thermal field + strong oxidation (Comparative Example 1) has higher self-corrosion potential and passivation potential than the blank control. The order of corrosion resistance from highest to lowest is: Example 3 > Comparative Example 1 > Blank Control. Therefore, the thermal field treatment + strong oxidation + laser cleaning treatment in this application has a significant effect on improving the corrosion resistance of high-entropy alloys.

[0096] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method of using a composite system for enhancing the corrosion resistance of high-entropy alloys, characterized in that, The method of use includes the following steps: The high-entropy alloy sample was placed on the base and fixed. Check if the composite system is operating normally; The protective gas in the gas storage tank is discharged through the control panel. Under the action of the protective gas, the first laser action is performed. The power of the first laser action is 35W~45W, the scanning speed is 2200mm / s~2300mm / s, and the horizontal and vertical orthogonal scans are performed several times. Adjust the height of the oxidation tank using the control panel so that the edge of the oxidation tank is at least 10 mm higher than the high-entropy alloy sample. The oxidant is injected into the oxidation tank from the oxidant storage tank through the control panel, so that the oxidant immerses the high-entropy alloy sample and is at least 2 mm above it; The heating device is controlled by the control panel to generate heat, and the heating plate applies a thermal field to the oxidant in the oxidation tank. When the temperature detection device detects that the temperature of the oxidant has reached the set temperature, after heat preservation treatment, the control panel controls the heating plate to stop heating. The protective gas in the gas storage tank is discharged by controlling the control panel. Under the action of the protective gas, a second laser action is performed. The power of the second laser action is 35W~45W, the scanning speed is 2200mm / s~2300mm / s, and several horizontal and vertical orthogonal scans are performed to obtain a high-entropy alloy with strong corrosion resistance.

2. The method of use according to claim 1, characterized in that, The composite system used in the method of use includes a housing, a control panel, a heat treatment device, an oxidation treatment device, and a laser cleaning treatment device installed inside the housing, and the heat treatment device, the oxidation treatment device, and the laser cleaning treatment device are respectively connected to the control panel. The heat treatment device is used for thermal field action, the oxidation treatment device is used for oxidation action, and the laser cleaning treatment device is used for laser action.

3. The method of use according to claim 2, characterized in that, The heat treatment apparatus includes a heating generator and a heating plate, wherein the heating generator is connected to the heating plate and the heating generator is connected to the control panel.

4. The method of use according to claim 2, characterized in that, The oxidation treatment device includes an oxidation tank and an oxidant storage tank, wherein the oxidation tank abuts against the heating plate and is located above the heating plate; the oxidant storage tank is connected to the control panel and communicates with the oxidation tank.

5. The method of use according to claim 4, characterized in that, The laser cleaning device includes a laser head and a gas storage tank. The laser head is connected to the control panel, and the laser head and the gas storage tank are respectively connected to the control panel.

6. The method of use according to claim 4, characterized in that, The housing is also provided with an exhaust device, which allows the inside and outside of the housing to communicate.

7. The method of use according to claim 6, characterized in that, The housing also includes a base and a temperature monitoring device. The base is disposed on the oxidation tank and abuts against the oxidation tank. The temperature monitoring device is disposed on the oxidation tank and connected to the control panel for detecting the temperature of the oxidation tank.

8. The method of use according to claim 7, characterized in that, The protective gas is argon, and the emission rate of the argon is 10L / min to 18L / min.

9. The method of use according to claim 7, characterized in that, The set temperature is 480℃~520℃.

Images