Anti-corrosion annular workpiece and workpiece anti-corrosion method
By forming a dense anticorrosion film on the embedded parts of the power plant, the problem of the reduced strength of the embedded parts in the corrosion environment is solved, extending the service life of the equipment and improving maintenance efficiency.
Patent Information
- Application Number
- CN202411632390.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2025-04-01
AI Technical Summary
The strength of embedded parts in existing power plants decreases in corrosion environments, resulting in difficulty in equipment maintenance and untimely supply of purchased parts, affecting the equipment usage rate.
Anti-corrosion ring workpieces are used to form a dense anti-corrosion film through round steel heating, insulation and engine oil soaking, which improves the corrosion resistance of the workpiece.
The formed anticorrosion film can prevent corrosion in humid or oily environments, extend the service life of the workpiece, and improve the efficiency of the equipment.
Smart Images
Figure CN119737373A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of metal anti-corrosion, and in particular to an anti-corrosion annular workpiece and a workpiece anti-corrosion method. Background Art
[0002] When repairing power plant units or open-pit mining equipment, it is necessary to replace embedded parts such as bolts that are used in corrosive environments such as sewage, oil, atmospheric oxidation, acid, alkali, and salt. Obviously, these parts cannot meet the requirements of use by mechanical processing by machine tools, and may even cause one part to affect the utilization rate of the entire equipment.
[0003] At present, the basic anti-corrosion measure of power plants is to paint the workpieces, but some parts with higher technical requirements can only be purchased from outside. However, the purchase cycle is long. For the parts that need to be replaced when repairing power plant units or open-pit mining equipment, the demand is only for small batches of single pieces, and bulk purchases cannot be formed. Therefore, the supply is not timely, and even one part affects the utilization rate of the entire equipment. Summary of the invention
[0004] In view of the problem of strength reduction due to corrosion of the above-mentioned existing embedded parts of power plants, the present invention is proposed.
[0005] Therefore, the purpose of the present invention is to provide a corrosion-resistant annular workpiece and a workpiece corrosion protection method, the purpose of which is to improve the corrosion resistance of embedded parts such as nuts, give full play to the high-strength limit service performance, and extend the service life of parts.
[0006] To solve the above technical problems, the present invention provides the following technical solutions: an anti-corrosion annular workpiece, comprising round steel, a plurality of groups of fastening planes are opened at equal angles on the outer wall of the round steel, and a fastening hole is opened in the middle of the round steel; and an anti-corrosion film, which completely covers the surface of the round steel.
[0007] In order to solve the above technical problems, the present invention also provides the following technical solutions: a workpiece anti-corrosion method, which is suitable for the above-mentioned anti-corrosion circular workpiece, comprising cleaning the round steel, wiping it dry and then placing it at room temperature to dry; heating the round steel to ensure that the entire surface is exposed to the heating range; wherein the round steel is heated to 550°C at a heating rate of 200°C per hour, kept warm for 30 minutes, and then cooled to room temperature to form an anti-corrosion film on the surface; finally, the round steel is immersed in engine oil and left to stand, and the finished product is taken out after a period of time.
[0008] As a preferred scheme of the workpiece anti-corrosion method of the present invention, before cleaning the round steel, the round steel needs to be completely immersed in soapy water and soaked for 10 minutes before cleaning; after soaking for 10 minutes, wipe the surface of the round steel with a wet cloth, and after the surface is completely wiped, put it in clean water for a second cleaning; after cleaning, wipe the fingerprints and water droplets on the surface of the round steel with a dry cloth.
[0009] As a preferred solution of the workpiece anti-corrosion method of the present invention, the round steel is turned over every 5 minutes during the soaking process in soapy water; at the same time, during the soaking process, the soapy water is stirred by a stirring device to ensure that it is in a flowing state.
[0010] As a preferred scheme of the workpiece anti-corrosion method of the present invention, the round steel needs to be naturally air-dried before heating, and after the surface is dry, it is sent into a sealed heating furnace; wherein the heating furnace is always in a sealed state during the heating process until the heating is completed.
[0011] As a preferred solution of the workpiece anti-corrosion method of the present invention, the heating furnace is an electric heating furnace, and the heating furnace is connected to an air supply device; during the heating process, the air supply device supplies water-rich air into the heating furnace.
[0012] As a preferred solution of the workpiece anti-corrosion method of the present invention, when the round steel is heated in a heating furnace, several groups of round steel can be laid out in a single layer at the same time; the several groups of round steel do not contact each other, and during the heating process, they need to be turned over at least four times.
[0013] As a preferred scheme of the workpiece anti-corrosion method of the present invention, the working process of the heating furnace includes a heating process and a heat preservation process; if it is in the heating process, the heating furnace is heated to 600°C at a heating rate of 200°C per hour. When it reaches 600°C, it only needs to continue heating for 5 minutes. During this process, the round steel needs to be turned over; if it is in the heat preservation process, the temperature of the heating furnace is reduced to 550°C for the final heat preservation before being taken out of the furnace.
[0014] As a preferred scheme described in the workpiece anti-corrosion method of the present invention, wherein: if the heating furnace is in the heating process, the gas supply device supplies gas into the heating furnace at the maximum output power; if the heating furnace is in the insulation process, the gas supply device supplies gas into the heating furnace at 50% of the maximum output power.
[0015] As a preferred scheme of the workpiece anti-corrosion method of the present invention, wherein: after the round steel is insulated and cooled to room temperature, it is placed in an oil immersion tank to contact with engine oil, and the round steel is completely immersed in the engine oil; the engine oil temperature is 40°C to 60°C, and after soaking for 10 minutes, it is taken out and wiped clean.
[0016] Compared with the prior art, the present invention has the following beneficial effects:
[0017] Through high-temperature heating, heat preservation, oil immersion and other means, a dense anti-corrosion film of a certain thickness and strength can be generated on the surface of the workpiece. At the same time, it will form a black or dark blue color and emit a metallic luster. This anti-corrosion film can prevent the workpiece from corrosion in some special working environments such as moisture and oil pollution, thereby increasing the service life of the workpiece. For the mechanical parts manufacturing industry, this anti-corrosion process is easy to operate, saves time, saves raw materials, does not require the use of liquid medicine, is more environmentally friendly, and has high safety performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:
[0019] Figure 1 It is a schematic diagram of the overall structure of the anti-corrosion annular workpiece of the present invention.
[0020] Figure 2 It is a schematic diagram of the anti-corrosion film structure of the anti-corrosion circular workpiece of the present invention.
[0021] Figure 3 It is a schematic flow chart of the workpiece anticorrosion method of the present invention.
[0022] Figure 4 Schematic diagram of air delivery for the workpiece anti-corrosion method of the present invention.
[0023] Figure 5 This is a schematic diagram of the heating and placement of round steel in the workpiece anti-corrosion method of the present invention.
[0024] Figure 6 Another schematic diagram of the arrangement of round steel for heating the workpiece anti-corrosion method of the present invention.
[0025] Figure 7 Schematic diagram of round steel oil immersion in the workpiece anti-corrosion method of the present invention. DETAILED DESCRIPTION
[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.
[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0028] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.
[0029] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.
[0030] Example 1
[0031] Reference Figure 1 to Figure 7 , which is the first embodiment of the present invention, provides an anti-corrosion annular workpiece, which includes a round steel 100, a plurality of groups of fastening planes 101 are opened at equal angles on the outer wall of the round steel 100, and a fastening hole 102 is opened in the middle of the round steel 100.
[0032] The anti-corrosion film 200 completely covers the surface of the round steel 100. The main component of the anti-corrosion film 200 is ferroferric oxide. Iron and water vapor form an oxide film on the iron surface under high temperature conditions.
[0033] Furthermore, the ferroferric oxide film is the oxide film with the densest structure and the best oxidation resistance among several oxide films on the surface of steel.
[0034] The round steel 100 is in the shape of a nut and serves as a fastener of the embedded part.
[0035] Round steel 100 is processed and formed by the following methods:
[0036] 1. Cutting round steel on sawing machine: Place the blank round steel 100 on the sawing machine workbench, extend the part of the round steel 100 that needs to be sawed out of the two clamping plates of the clamping device, use the hand wheel to tighten the clamping device during sawing, and move the clamping plates on both sides of the clamping device toward each other for locking and fixing.
[0037] Turn on the sawing machine switch, select the band saw linear speed of 45m / min, move the saw blade downward to saw and cut the material, release the clamping device after cutting is completed, and push out the remaining material.
[0038] 2. Mill the six sides of the nut. Transfer the nut blank round steel 100 cut from the sawing machine to the milling machine, place it on the milling machine platform, fix it with the milling machine flat-nose pliers, turn the flat-nose pliers wrench counterclockwise to clamp the nut, press the control switch to move the milling cutter to the milling position to mill the six sides to form a fastening plane 101, and select the milling cutter feed rate and the cutting depth each time to be 3mm.
[0039] After milling is completed, press the control switch to retract the milling cutter to the starting position, turn the flat-nose pliers wrench clockwise to loosen the nut-shaped round steel 100, and the milling process is completed.
[0040] Example 2
[0041] Reference Figure 1 to Figure 7 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that it provides a workpiece anti-corrosion method, which is applicable to the anti-corrosion annular workpiece in the above embodiment, and includes the following steps:
[0042] S1: Clean the round steel 100, wipe it dry and place it at room temperature to dry.
[0043] S2: Heat the round steel 100, ensuring that the entire surface is exposed to the heating range.
[0044] The round steel 100 is heated to 550° C. at a heating rate of 200° C. per hour, kept at that temperature for 30 minutes, and then cooled to room temperature, and an anti-corrosion film 200 is formed on the surface.
[0045] S3: Finally, the round steel 100 is immersed in the engine oil and left to stand for a period of time before the finished product is taken out.
[0046] Specifically, before cleaning the round steel 100, the round steel 100 needs to be completely immersed in soapy water and soaked for 10 minutes before cleaning; after soaking for 10 minutes, wipe the surface of the round steel 100 with a wet cloth, and after the surface is completely wiped, put it in clean water for a second cleaning; after cleaning, wipe fingerprints and water droplets on the surface of the round steel 100 with a dry cloth.
[0047] After the round steel 100 is processed into a nut shape, in order to ensure that grease and impurities on the surface of the round steel 100 can be effectively removed, the concentration of soapy water is preferably between 0.5% and 1%.
[0048] Furthermore, when drying the round steel 100, be sure to use latex gloves throughout the process, and there should be no traces of fingerprints, water droplets, etc. on the workpiece surface.
[0049] Furthermore, during the soaking process of the round steel 100 in the soapy water, the round steel 100 is turned over every 5 minutes; at the same time, during the soaking process, the soapy water is stirred by a stirring device to ensure that it is in a flowing state.
[0050] The purpose of turning over is to ensure that the oil film and other impurities on the outside of the round steel 100 are fully in contact with the soapy water, so as to achieve the best decontamination and degreasing effect.
[0051] Before the round steel 100 is heated, it needs to be naturally air-dried. After the surface is dry, it is sent into the sealed heating furnace 300; wherein, the heating furnace 300 is always in a sealed state during the heating process until the heating is completed.
[0052] It should be noted that, during the process of placing the round steel 100 into the heating furnace 300, there should be no trace of touching on the surface during the entire process, otherwise the color will be uneven after processing.
[0053] The heating furnace 300 is an electric heating furnace, and the heating furnace 300 is connected to the air supply device 400; during the heating process, the air supply device 400 supplies moisture-rich air into the heating furnace 300.
[0054] Among them, the heating furnace 300 preferably adopts a rotary bottom heating furnace, which is suitable for heating materials that cannot be transported by pushing steel and walking methods, such as round billets, wheels, etc. The round steel 100 in this embodiment is ring-shaped and cannot be bumped.
[0055] The gas supply device 400 may be a pipeline gas delivery device similar to a natural gas delivery device, and may be equipped with a gas delivery pump.
[0056] During this process, the round steel 100 reacts with the water vapor input from the gas supply device 400 at high temperature in the heating furnace 300 to form a ferroferric oxide film on the round steel 100.
[0057] When the round steel 100 is heated in the heating furnace 300 , several groups of round steel 100 may be laid out in a single layer at the same time; the groups of round steel 100 do not contact each other, and during the heating process, they need to be turned over at least four times.
[0058] In order to ensure that the surface of the round steel 100 is heated evenly and that the surface is completely covered by the ferroferric oxide film, the contact surface between the round steel 100 and the heating furnace 300 needs to be exposed again.
[0059] The remaining structures are the same as those of Example 1.
[0060] Example 3
[0061] Reference Figure 1 to Figure 7 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that: the working process of the heating furnace 300 includes a heating process and a heat preservation process; if it is in the heating process, the heating furnace 300 heats to 600°C at a heating rate of 200°C per hour. When it reaches 600°C, it only needs to continue heating for 5 minutes. During this process, the round steel 100 needs to be turned over.
[0062] If it is in the heat preservation process, the temperature of the heating furnace 300 is reduced to 550° C. for the final heat preservation before taking out of the furnace.
[0063] If the heating furnace 300 is in the heating process, the gas supply device 400 supplies gas into the heating furnace 300 at the maximum output power; if the heating furnace 300 is in the insulation process, the gas supply device 400 supplies gas into the heating furnace 300 at 50% of the maximum output power.
[0064] In order to verify the influence of the insulation temperature on the formation of the anti-corrosion film 200, the following experiment was conducted:
[0065] Experimental steps:
[0066] 1. Prepare round steel samples of the same size and material to ensure consistent initial conditions.
[0067] 2. Perform the same cleaning and pretreatment steps for each sample.
[0068] 3. Place the sample in a heating furnace, heat to 600°C, and maintain this temperature.
[0069] 4. After reaching 600℃, set different holding times according to different experimental numbers and adjust the holding temperature, such as 500℃, 525℃, 550℃, 575℃, and 600℃.
[0070] 5. After the insulation is completed, let the sample cool naturally to room temperature.
[0071] 6. Measure the oxide film of each sample and make the following table:
[0072] Table 1: Effect of insulation temperature on anti-corrosion film
[0073]
[0074]
[0075] It can be seen from the above table that under the condition of a holding temperature of 550°C, the thickness, density, purity, adhesion and corrosion resistance of the oxide film will reach the best state, which proves that the holding temperature of 550°C is the best holding temperature.
[0076] Furthermore, in order to verify the effect of the holding time on the formation of the anti-corrosion film 200, the following experiment was conducted:
[0077] Experimental steps:
[0078] 1. Prepare round steel samples of the same size and material to ensure consistent initial conditions.
[0079] 2. Perform the same cleaning and pretreatment steps for each sample.
[0080] 3. Place the sample in a heating furnace, heat to 550°C, and maintain this temperature.
[0081] 4. After reaching 550°C, set different holding times such as 10 minutes, 20 minutes, 30 minutes, 40 minutes, and 50 minutes according to different experimental numbers.
[0082] 5. After the insulation is completed, let the sample cool naturally to room temperature.
[0083] 6. Measure the oxide film of each sample and make the following table:
[0084] Table 2: Effect of holding time on anticorrosion film
[0085]
[0086]
[0087] It can be seen from the above table that under the condition of 30 minutes of insulation, the oxide film will be blue-black, and its thickness, density, purity, adhesion and corrosion resistance will reach the best state, which proves that 30 minutes is the best insulation time.
[0088] After the round steel 100 is insulated and cooled to room temperature, it is placed in the oil immersion tank 500 to contact the engine oil, and the round steel 100 is completely immersed in the engine oil; the engine oil temperature is 40°C to 60°C. After soaking for 10 minutes, take it out and wipe it clean.
[0089] Furthermore, when the engine oil temperature is 40°C to 60°C, which is slightly higher than the cooled round steel 100, an oil film can be formed on the outer surface of the round steel 100 after immersion for 10 minutes, thereby further protecting the anti-corrosion film 200 and improving the anti-corrosion performance.
[0090] The remaining structure is the same as that of Example 2.
[0091] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.
Claims
1. An anti-corrosion annular workpiece, characterized in that: include, A round steel (100), wherein the outer wall of the round steel (100) is provided with a plurality of groups of fastening planes (101) at equal angles, and a fastening hole (102) is provided in the middle of the round steel (100); An anti-corrosion film (200), wherein the anti-corrosion film (200) completely covers the surface of the round steel (100).
2. A workpiece anticorrosion method, characterized in that: The anti-corrosion annular workpiece according to claim 1 comprises: Clean the round steel (100), wipe it dry and place it at room temperature to dry; Heat the round steel (100) to ensure that the entire surface is exposed to the heating range; The round steel (100) is heated to 550°C at a heating rate of 200°C per hour, kept at this temperature for 30 minutes, and then cooled to room temperature to form an anti-corrosion film (200) on the surface; Finally, the round steel (100) is immersed in the engine oil and allowed to stand for a period of time before the finished product is taken out.
3. The workpiece anticorrosion method according to claim 2, characterized in that: Before cleaning the round steel (100), the round steel (100) must be completely immersed in soapy water and soaked for 10 minutes before cleaning; After soaking for 10 minutes, wipe the surface of the round steel (100) with a damp cloth. After the surface is completely wiped, put it in clean water for a second cleaning; After cleaning, wipe off fingerprints and water drops on the surface of the round steel (100) with a dry cloth.
4. The workpiece anticorrosion method according to claim 3, characterized in that: During the soaking of the round steel (100) in the soapy water, the round steel (100) is turned over every 5 minutes; Meanwhile, during the soaking process, the soapy water is stirred by means of a stirring device to ensure that it is in a fluid state.
5. The workpiece anticorrosion method according to claim 3 or 4, characterized in that: Before the round steel (100) is heated, it needs to be naturally air-dried, and after the surface is dried, it is sent into a sealed heating furnace (300); The heating furnace (300) is always in a sealed state during the heating process until the heating is completed.
6. The workpiece anticorrosion method according to claim 5, characterized in that: The heating furnace (300) is an electric heating furnace, and the heating furnace (300) is connected to the gas supply device (400); During the heating process, the air supply device (400) supplies air rich in moisture into the heating furnace (300).
7. The workpiece anticorrosion method according to claim 6, characterized in that: When the round steel (100) is heated in the heating furnace (300), a plurality of groups of round steel (100) can be laid flat in a single layer at the same time; The groups of round steels (100) do not contact each other, and need to be turned over at least four times during the heating process.
8. The workpiece anticorrosion method according to claim 7, characterized in that: The working process of the heating furnace (300) includes a heating process and a heat preservation process; If it is in the heating process, the heating furnace (300) is heated to 600°C at a heating rate of 200°C per hour. When the temperature reaches 600°C, the heating needs to be continued for 5 minutes. During this process, the round steel (100) needs to be turned over. If it is in the heat preservation process, the temperature of the heating furnace (300) is reduced to 550°C for the final heat preservation before being taken out of the furnace.
9. The workpiece anticorrosion method according to claim 8, characterized in that: If the heating furnace (300) is in the heating process, the gas supply device (400) supplies gas into the heating furnace (300) at the maximum output power; If the heating furnace (300) is in the heat preservation process, the gas supply device (400) supplies gas into the heating furnace (300) at 50% of the maximum output power.
10. The workpiece anticorrosion method according to any one of claims 2 to 4 and 6 to 9, characterized in that: After the round steel (100) is cooled to room temperature after heat preservation, it is placed in an oil immersion tank (500) to contact the engine oil, and the round steel (100) is completely immersed in the engine oil; The engine oil temperature should be between 40℃ and 60℃. After soaking for 10 minutes, take it out and wipe it clean.