Preparation method and device of corrosion-resistant hot stamping part

Abstract

The invention provides a preparation method and device of a corrosion-resistant hot stamping part. The preparation method comprises the following steps that a bare board is blanked into a blank in a preset shape; the blank is fed into a heating furnace to be heated, so that the blank is austenitized; the austenitized blank is put into a die to be stamped, and the blank is formed into a part; carrying out surface pretreatment on the formed part to obtain a to-be-plated part; and the obtained to-be-plated part is evaporated for less than 30 min, so that a zinc plating layer or a zinc alloy layer with the thickness larger than 3 microns is formed on the surface of the to-be-plated part. According to the preparation method of the corrosion-resistant hot stamping part, the zinc coating or the zinc alloy layer is rapidly applied through the evaporation process, the hydrogen embrittlement risk does not exist in the coating forming process, tempering dehydrogenation treatment is not needed, and the prepared hot stamping part has excellent corrosion resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of hot stamping, and in particular relates to a method and a device for preparing corrosion-resistant hot stamping parts. Background Art

[0002] At present, the hot stamping industry generally adopts several processes, including bare plate hot stamping, aluminum silicon coating hot stamping, galvanized plate hot stamping and bare plate hot stamping followed by electrogalvanizing. Among them, a large amount of oxide scale is generated in the bare plate hot stamping process, and the formed parts have no corrosion resistance. Although aluminum silicon / galvanized hot stamping parts have good antioxidant ability, their corrosion resistance is poor. Patent CN109821951A discloses a method and device for preparing corrosion-resistant hot stamping parts, which proposes a method of electrogalvanizing after hot forming parts to effectively increase the corrosion resistance of hot stamping parts. However, there is a risk of hydrogen embrittlement during the electroplating process, and tempering treatment is required to remove hydrogen. In addition, wastewater and waste gas will be generated during the electroplating process, which is prone to environmental problems, and additional wastewater treatment equipment and waste gas treatment equipment are required. Summary of the invention

[0003] In view of the above-mentioned problems existing in the prior art, the main purpose of the present invention is to provide a method and device for preparing corrosion-resistant hot stamping parts, in which a zinc coating or a zinc alloy layer is quickly applied to the parts after hot stamping and surface pretreatment by a vapor deposition process. There is no risk of hydrogen embrittlement during the coating formation process, and no tempering and dehydrogenation treatment is required. The prepared hot stamping parts have excellent corrosion resistance.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] The present invention provides a method for preparing a corrosion-resistant hot stamping part, comprising the following steps:

[0006] Blanking the bare board into blanks of preset shapes;

[0007] The blank is sent into a heating furnace for heating to austenitize the blank;

[0008] placing the austenitized blank into a die for stamping to form it into a part;

[0009] Performing surface pretreatment on the formed parts to obtain parts to be plated;

[0010] The obtained parts to be plated are subjected to evaporation for less than 30 minutes to form a zinc plating layer or a zinc alloy layer with a thickness greater than 3 um on the surface.

[0011] As a further description of the above technical solution, the thickness of the zinc coating is 5um-13um.

[0012] As a further description of the above technical solution, in the step of "evaporating the obtained parts to be plated for less than 30 minutes to form a zinc plating layer or zinc alloy layer with a thickness greater than 3um on the surface", the time for evaporating the parts to be plated is 3min-10min.

[0013] As a further description of the above technical solution, the step of "performing evaporation on the obtained part to be plated for less than 30 minutes to form a zinc coating or zinc alloy layer with a thickness greater than 3 um on the surface thereof" includes:

[0014] Sending the obtained parts to be plated into a vapor deposition mechanism;

[0015] Vacuuming the evaporation mechanism;

[0016] Performing evaporation on the parts to be plated sent into the evaporation mechanism to obtain parts with a zinc coating or a zinc alloy coating formed on the surface;

[0017] The evaporation mechanism is subjected to vacuum breaking to obtain parts with a zinc-plated layer or a zinc alloy layer on the surface.

[0018] As a further description of the above technical solution, in the step of "evaporating the parts to be plated sent into the evaporation mechanism to obtain parts with a zinc coating layer or a zinc alloy layer formed on the surface", the parts to be plated are in a rotating state.

[0019] As a further description of the above technical solution, in the step of "evaporating the parts to be plated sent into the evaporation mechanism to obtain parts with a zinc coating or a zinc alloy layer formed on the surface", the temperature of the parts to be plated is less than 200°C.

[0020] As a further description of the above technical solution, the temperature of the part to be plated is less than 50°C.

[0021] As a further description of the above technical solution, in the step of "blanking the bare plate into a blank of a preset shape", the bare plate is a hot-formed bare steel plate with a strength of not less than 1500 MPa.

[0022] As a further description of the above technical solution, the strength of the hot-formed bare steel plate is 1500MPa or 2000MPa.

[0023] As a further description of the above technical solution, in the step of "sending the blank into a heating furnace for heating to austenitize the blank", the heating furnace includes a vacuum heating furnace or an atmosphere heating furnace, and the oxygen content in the heating furnace is less than 0.01%.

[0024] As a further description of the above technical solution, the vacuum degree in the vacuum heating furnace is less than 100Pa.

[0025] As a further description of the above technical solution, the vacuum degree in the vacuum heating furnace is 1Pa-10Pa.

[0026] As a further description of the above technical solution, in the step of "subjecting surface pretreatment to the formed part to obtain the part to be plated", the surface pretreatment includes sandblasting or pickling the formed part.

[0027] As a further description of the above technical solution, before the formed parts are sandblasted or pickled, the parts are also laser trimmed or cut.

[0028] The present invention also provides a preparation device for corrosion-resistant hot stamping parts, which adopts the preparation method as described above, including a blanking mechanism, a heating mechanism, a forming mechanism, a vapor deposition pretreatment mechanism and a vapor deposition mechanism, wherein:

[0029] The blanking mechanism is used to blank the bare steel plate into a blank of a preset shape;

[0030] The heating mechanism is used to heat the blank formed into a preset shape;

[0031] The forming mechanism is used to form the heated blank into a part;

[0032] The evaporation pre-treatment mechanism is used to perform surface pre-treatment on the formed parts to obtain parts to be plated;

[0033] The evaporation mechanism is used to perform evaporation on the obtained parts to be plated for a period of less than 30 minutes, so that a zinc coating layer or a zinc alloy layer with a thickness greater than 3 um is formed on the surface.

[0034] In summary, the outstanding effects of the present invention are:

[0035] The method for preparing corrosion-resistant hot stamping parts provided by the present invention adopts an evaporation process instead of electroplating during the forming process of hot-formed stamping parts, and quickly applies a zinc coating layer or a zinc alloy layer on the surface of the part to be plated. There is no risk of hydrogen embrittlement during the formation of the zinc coating layer or the zinc alloy layer, and no tempering and dehydrogenation treatment is required. The prepared hot stamping parts also have excellent corrosion resistance. In addition, the zinc coating layer or the zinc alloy layer is applied to the surface of the part to be plated by evaporation, which does not generate wastewater and waste gas, thereby avoiding pollution to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the 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 paying any creative work.

[0037] Figure 1 is a flow chart of a method for preparing a corrosion-resistant hot stamping part according to an embodiment of the present invention;

[0038] Figure 2 is a schematic diagram of a first structure of the evaporation mechanism described in an embodiment of the present invention;

[0039] Figure 3 is a schematic diagram of a second structure of the evaporation mechanism described in an embodiment of the present invention;

[0040] Figure 4 This is a state diagram of the hot stamping anti-collision beam after the galvanizing layer is applied by evaporation in Example 1 of the present invention;

[0041] Figure 5 This is a test result diagram of the bonding strength of the galvanized layer after the galvanized layer is applied by evaporation to the anti-collision beam formed by hot stamping in Example 1 of the present invention;

[0042] Figure 6 This is a corrosion diagram of the hot stamping anti-collision beam in Example 1 of the present invention after the galvanized layer is evaporated and subjected to a 48-hour neutral salt spray test;

[0043] Figure 7 This is a state diagram of the hot stamping reinforced plate after the zinc-aluminum alloy layer is evaporated and applied in Example 2 of the present invention;

[0044] Figure 8 This is a corrosion diagram of the hot stamping reinforcement plate in Example 2 of the present invention after a zinc-aluminum alloy layer is evaporated and subjected to a 68-hour neutral salt spray test. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] See also Figure 1 The embodiment of the present invention provides a method for preparing a corrosion-resistant hot stamping part, comprising the following steps:

[0047] First, a bare plate of a preset model is blanked into a blank of a preset shape. The specific blanking methods include cold stamping and laser cutting. The bare plate described in this embodiment is a hot-formed bare steel plate with a strength of not less than 1500MPa (bare steel plate is generally understood as a steel plate without a coating on the surface), and its strength is preferably 1500MPa or 2000MPa.

[0048] Next, the blank is sent into a heating furnace for heating to austenitize the blank. Specifically, the blank is sent into the heating furnace for heating to reach an austenite state and heat preservation, so that the austenite in the blank is homogenized. The heating furnace is an oxygen-free heating furnace, including a vacuum heating furnace or an atmosphere heating furnace, wherein the vacuum degree of the vacuum heating furnace is less than 100Pa, and preferably, the vacuum degree of the vacuum heating furnace is 1-10Pa. Specifically, when the chamber door of the vacuum heating furnace is closed, the vacuum pumping device is started to vacuumize the furnace. After the vacuum pumping reaches a preset time, the vacuum degree in the furnace reaches 1-10Pa, and then, for example, a preset high-purity nitrogen is used to inflate the vacuum heating furnace to reach an atmospheric pressure in the vacuum heating furnace, and then the heating device in the furnace can be started to heat and keep the blank warm to make it austenitize. It should be understood that the time for heating and keeping the blank warm can be adjusted according to the thickness of different blanks. The oxygen content in the heating furnace is less than 0.01%, so that the blank is heated to a high temperature in an oxygen-free environment, which can greatly reduce the oxidation of the blank. Therefore, the surface quality of the formed parts is guaranteed, and the subsequent sandblasting process is effectively shortened; and there is almost no residual oxide on the surface of the heated parts, which greatly reduces the pickling time before the surface coating is applied to the parts.

[0049] Next, the austenitized blank is quickly placed into the die by an end picker for stamping to form a part; specifically, the time for the blank to be transferred from the heating furnace to the die is about 5s-10s, which effectively reduces the time the high-temperature blank is exposed to the air, avoids oxidation of the high-temperature blank, and avoids a sharp drop in the temperature of the high-temperature blank. The hot stamping method is also conducive to the excellent mechanical properties of the parts formed by the blank.

[0050] Then, the formed parts are subjected to surface pretreatment to obtain parts to be plated. Specifically, the surface pretreatment includes sandblasting or pickling the formed parts to remove surface oxide scale. Among them, sandblasting the formed parts can not only effectively remove surface oxide scale, but also increase the roughness of the surface of the parts, which is conducive to increasing the bonding force of the parts. Specifically, in this embodiment, before sandblasting or pickling the formed parts, necessary laser trimming or hole cutting will be performed on the parts.

[0051] Finally, the obtained parts to be plated are subjected to evaporation for less than 30 minutes by using an evaporation mechanism, so that a zinc coating layer or zinc alloy layer with a thickness greater than 3um is formed on the surface. Preferably, the thickness of the zinc coating layer is 5um-13um, and the zinc coating layer within this thickness range not only has good corrosion resistance, but also has good welding performance. Preferably, the duration of evaporation on the parts to be plated is 3min-10min, and the application of the zinc coating layer of the required thickness can be completed. In this process, it includes: sending the obtained parts to be plated into the evaporation mechanism; then vacuumizing the evaporation mechanism; then evaporating the parts to be plated sent into the evaporation mechanism to obtain parts with a zinc coating layer or zinc alloy layer formed on the surface, and during the evaporation, the parts to be plated are in a rotating state, that is, during the evaporation process, the parts to be plated rotate in the evaporation chamber, and by rotating, the uniformity of the zinc coating layer or zinc alloy layer applied to the surface of the parts to be plated can be achieved; finally, the evaporation mechanism is broken by vacuum to obtain the parts with a zinc coating layer or zinc alloy layer formed on the surface. Specifically, in this embodiment, the evaporation mechanism may include: Figure 2 In the continuous vacuum evaporation production line shown, the parts to be plated are loaded one by one in the loading area thereof, and then transferred to the feed buffer chamber for vacuuming before evaporation. After reaching the required vacuum degree, the partition door connected to the feed buffer chamber is opened to allow the parts to enter the vacuum evaporation chamber for application of the zinc coating or zinc alloy layer. After the evaporation is completed, the partition door of the discharge buffer chamber connected to the downstream is opened to allow the parts to enter the discharge buffer chamber. The discharge buffer chamber has been evacuated before the partition door is opened. After the preset buffering time, the vacuum is broken, and the discharge door of the discharge buffer chamber is opened to allow the parts with the zinc coating or zinc alloy layer applied to be transported to the unloading area for unloading. In addition, the evaporation mechanism may include the following: Figure 3 The cyclic vacuum evaporation production line shown can hang the parts to be plated on the hanger of the vacuum evaporation furnace, and then quickly evacuate the vacuum to make the vacuum value of the vacuum evaporation furnace reach a preset value, and then evaporate the parts to be plated to form a zinc coating or zinc alloy layer thereon. After the zinc coating or zinc alloy layer is applied, the vacuum is broken and the material is unloaded.

[0052] Specifically, in this embodiment, in the step of "evaporating the part to be plated into the evaporation mechanism to obtain a part with a zinc coating or zinc alloy coating formed on the surface", the temperature of the part to be plated is less than 200°C, so that the performance of the part to be plated does not change significantly. Preferably, the temperature of the part to be plated is less than 50°C.

[0053] Specifically, in this embodiment, in the step of "evaporating the parts to be plated into the evaporation mechanism to obtain parts with a zinc coating or zinc alloy coating on the surface", the vacuum value in the vacuum evaporation chamber or vacuum evaporation furnace is maintained at 10 -2Pa. The setting of low vacuum value is more conducive to the overflow of hydrogen generated in the aforementioned pickling process of the formed parts. The zinc coating or zinc alloy layer is applied to the surface of the parts to be plated by evaporation, without the risk of hydrogen embrittlement and without tempering to remove hydrogen. In addition, the zinc coating or zinc alloy layer is applied to the surface of the parts to be plated by evaporation, which does not generate wastewater and waste gas, avoiding pollution to the environment.

[0054] The present embodiment is described in detail below through specific embodiments:

[0055] Embodiment 1:

[0056] First, the 1.6mm anti-collision beam blank is placed in a vacuum heating furnace for heating at a temperature of 930°C-950°C, a heating time of 5 minutes, and a vacuum degree of 10Pa to austenitize it.

[0057] Then the heated austenitized anti-collision beam blank is stamped to form an anti-collision beam part;

[0058] Then, the stamped anti-collision beam parts are trimmed and holes are cut;

[0059] Then, the anti-collision beam parts that have been trimmed and cut are sandblasted to remove the oxide skin, so as to obtain the anti-collision beam parts to be plated. The sandblasting pressure is set to 0.3Mpa, and 220 mesh alumina sand is used;

[0060] Then put the obtained anti-collision beam parts to be plated into Figure 2 The continuous vacuum evaporation production line shown in the figure performs vacuum evaporation galvanizing. First, put the anti-collision beam parts to be plated on the hanger of the vacuum evaporation furnace, so that they enter the feed buffer chamber. After the feed buffer chamber reaches the required vacuum degree, open the partition door connected to the vacuum evaporation chamber on the right side to allow them to enter the vacuum evaporation chamber. During the evaporation galvanizing process, the anti-collision beam parts rotate and move forward. During the evaporation process, the temperature inside the vacuum evaporation furnace is consistent with the room temperature. After 5 minutes of evaporation, open the partition door connecting the vacuum evaporation chamber and the discharge buffer chamber on its right side to allow the anti-collision beam parts to enter the discharge buffer chamber. After the evaporation is completed, break the vacuum, open the discharge door of the discharge buffer chamber, and take out the evaporated parts. The thickness of the zinc coating on the surface of the anti-collision beam parts after evaporation is 5um-7um.

[0061] Embodiment 2:

[0062] First, the 1.4 mm reinforced plate blank obtained by blanking is placed in a vacuum heating furnace for heating at a temperature of 930°C-950°C, a heating time of 5 minutes, and a vacuum degree of 10 Pa to austenitize it.

[0063] The heated austenitized sheet is then punched to form a reinforcement plate part;

[0064] Then, the punched reinforcement plate parts are trimmed and holes are cut;

[0065] Then, the reinforced plate parts with trimmed edges and holes are sandblasted to remove the oxide scale, thereby obtaining the reinforced plate parts to be plated. The sandblasting pressure is set to 0.2Mpa, and 180 mesh aluminum oxide sand is used.

[0066] Then the obtained reinforcement plate parts to be plated are sent to Figure 3 The cyclic vacuum evaporation plating production line shown in the figure is used for vacuum evaporation plating of zinc-aluminum alloy coating, in which the aluminum content is 10%. First, the reinforced plate parts to be plated are placed on the hanger of the vacuum evaporation furnace, and then the vacuum evaporation furnace is quickly evacuated to a vacuum value of 10 -2 Pa, and then heat the zinc-aluminum alloy wire to evaporate the zinc-aluminum alloy layer. During the evaporation of the zinc-aluminum alloy layer, the reinforcing plate parts to be plated are rotated. During the evaporation process, the temperature in the vacuum evaporation furnace is maintained at 50°C. The evaporation time is 10 minutes, and the thickness of the zinc-aluminum alloy layer after evaporation is 7-10um.

[0067] Embodiment 3:

[0068] First, the 1.2 mm A-pillar blank is placed in a nitrogen-protected heating furnace for heating at a temperature of 930° C. to 950° C. for 5 minutes to austenitize it.

[0069] Then the heated austenitized A-pillar blank is stamped to form an A-pillar part;

[0070] Then the A-pillar parts after stamping are trimmed and holes are cut;

[0071] Then, the A-pillar parts that have been trimmed and cut are sandblasted to remove the oxide scale, so as to obtain the A-pillar parts to be plated. The sandblasting pressure is set to 0.2Mpa, and 180 mesh aluminum oxide sand is used;

[0072] Then put the obtained A-pillar parts to be plated into Figure 2The continuous vacuum evaporation production line shown in the figure performs vacuum evaporation galvanizing. First, place the A-pillar parts to be plated on the hanger of the vacuum evaporation furnace, so that they enter the feed buffer chamber. After the feed buffer chamber reaches the required vacuum degree, open the partition door connected to the vacuum evaporation chamber on the right side to allow them to enter the vacuum evaporation chamber. During the evaporation galvanizing process, the A-pillar parts rotate and move forward. During the evaporation process, the temperature inside the vacuum evaporation furnace is consistent with the room temperature. After 15 minutes of evaporation, open the partition door connecting the vacuum evaporation chamber and the discharge buffer chamber on its right side to allow the A-pillar parts to enter the discharge buffer chamber. After the evaporation is completed, break the vacuum, open the discharge door of the discharge buffer chamber, and take out the evaporated parts. The thickness of the galvanized layer on the surface of the A-pillar parts after evaporation is 10um-13um.

[0073] like Figure 4 , Figure 7 As shown in Table 1, the coating thickness uniformity test was performed on the parts after evaporation in Examples 1-3, and the test results are as follows:

[0074] Table 1 Test results of coating thickness uniformity of parts after evaporation in each embodiment

[0075]

[0076]

[0077] It can be seen from Table 1 that the coating thickness of the vapor-deposited parts in each embodiment is within the preset thickness range, meeting the production requirements. It should be understood that the sampling points in the three embodiments are randomly selected;

[0078] like Figure 5 As shown, the galvanized layer bonding strength test was performed on the anti-collision beam part in Example 1, and the bonding strength was level 0.

[0079] like Figure 6 and Figure 8 As shown, the parts in Example 1 and Example 2 were subjected to salt spray tests, wherein the anti-collision beam parts in Example 1 showed no rust after being in a neutral salt spray environment for 48 hours, and the reinforcing plate parts in Example 2 showed no rust after being in a neutral salt spray environment for 68 hours. The parts in the two embodiments are protected by a galvanized layer applied on their surfaces and have excellent corrosion resistance.

[0080] Specifically, this embodiment further provides a preparation device for corrosion-resistant hot stamping parts, which adopts the preparation method described in this embodiment, including a blanking mechanism, a heating mechanism, a forming mechanism, a vapor deposition pretreatment mechanism and a vapor deposition mechanism, wherein:

[0081] The blanking mechanism is used to blank the bare steel plate into a blank of a preset shape;

[0082] The heating mechanism is used to heat the blank formed into a preset shape;

[0083] The forming mechanism is used to form the heated blank into a part;

[0084] The evaporation pre-treatment mechanism is used to perform surface pre-treatment on the formed parts to obtain parts to be plated;

[0085] The evaporation mechanism is used to perform evaporation on the obtained parts to be plated for a period of less than 30 minutes, so that a zinc coating layer or a zinc alloy layer with a thickness greater than 3 um is formed on the surface.

[0086] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any changes, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing corrosion-resistant hot stamping parts, characterized in that: The following steps are involved: Blanking the bare board into blanks of preset shapes; The blank is sent into a heating furnace for heating to austenitize the blank; placing the austenitized blank into a die for stamping to form it into a part; Performing surface pretreatment on the formed parts to obtain parts to be plated; The obtained parts to be plated are subjected to evaporation for less than 30 minutes to form a zinc plating layer or a zinc alloy layer with a thickness greater than 3 um on the surface.

2. The method for preparing corrosion-resistant hot stamping parts according to claim 1, characterized in that: The thickness of the zinc coating is 5um-13um.

3. The method for preparing corrosion-resistant hot stamping parts according to claim 1, characterized in that: In the step of "performing evaporation on the obtained parts to be plated for less than 30 minutes to form a zinc coating or zinc alloy layer with a thickness greater than 3 um on the surface", the evaporation time of the parts to be plated is 3 minutes to 10 minutes.

4. The method for preparing corrosion-resistant hot stamping parts according to claim 1, characterized in that: The step of "performing evaporation on the obtained part to be plated for less than 30 minutes to form a zinc coating or zinc alloy coating with a thickness greater than 3 um on the surface thereof" includes: Sending the obtained parts to be plated into a vapor deposition mechanism; Vacuuming the evaporation mechanism; Performing evaporation on the parts to be plated sent into the evaporation mechanism to obtain parts with a zinc coating or a zinc alloy coating formed on the surface; The evaporation mechanism is subjected to vacuum breaking to obtain parts with a zinc-plated layer or a zinc alloy layer on the surface.

5. The method for preparing corrosion-resistant hot stamping parts according to claim 4, characterized in that: In the step of "evaporating the parts to be plated which are fed into the evaporation mechanism to obtain parts with a zinc coating or a zinc alloy coating formed on the surface", the parts to be plated are in a rotating state.

6. The method for preparing corrosion-resistant hot stamping parts according to claim 4, characterized in that: In the step of "evaporating the parts to be plated which are fed into the evaporation mechanism to obtain parts with a zinc coating or a zinc alloy coating formed on the surface", the temperature of the parts to be plated is less than 200°C.

7. The method for preparing corrosion-resistant hot stamping parts according to claim 6, characterized in that: The temperature of the parts to be plated is less than 50°C.

8. The method for preparing corrosion-resistant hot stamping parts according to claim 1, characterized in that: In the step of "blanking the bare plate into a blank of a preset shape", the bare plate is a hot-formed bare steel plate with a strength of not less than 1500 MPa.

9. The method for preparing corrosion-resistant hot stamping parts according to claim 8, characterized in that: The strength of the hot-formed bare steel plate is 1500MPa or 2000MPa.

10. The method for preparing corrosion-resistant hot stamping parts according to claim 1, characterized in that: In the step of "sending the blank into a heating furnace for heating to austenitize the blank", the heating furnace includes a vacuum heating furnace or an atmosphere heating furnace, and the oxygen content in the heating furnace is less than 0.01%.

11. The method for preparing corrosion-resistant hot stamping parts according to claim 10, characterized in that: The vacuum degree in the vacuum heating furnace is less than 100Pa.

12. The method for preparing corrosion-resistant hot stamping parts according to claim 11, characterized in that: The vacuum degree in the vacuum heating furnace is 1Pa-10Pa.

13. The method for preparing corrosion-resistant hot stamping parts according to claim 1, characterized in that: In the step of "subjecting surface pretreatment to the molded part to obtain a part to be plated", the surface pretreatment includes sandblasting or pickling the molded part.

14. The method for preparing corrosion-resistant hot stamping parts according to claim 13, characterized in that: Before sandblasting or pickling the formed parts, the parts are also laser trimmed or cut.

15. A device for preparing corrosion-resistant hot stamping parts, which adopts the preparation method according to any one of claims 1 to 14, characterized in that: It includes a blanking mechanism, a heating mechanism, a molding mechanism, a vapor deposition pre-treatment mechanism and a vapor deposition mechanism, wherein: The blanking mechanism is used to blank the bare steel plate into a blank of a preset shape; The heating mechanism is used to heat the blank formed into a preset shape; The forming mechanism is used to form the heated blank into a part; The evaporation pre-treatment mechanism is used to perform surface pre-treatment on the formed parts to obtain parts to be plated; The evaporation mechanism is used to perform evaporation on the obtained parts to be plated for a period of less than 30 minutes, so that a zinc coating layer or a zinc alloy layer with a thickness greater than 3 um is formed on the surface.

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