Stamping part sealed storage device and system based on potential regulation and control

Abstract

The invention discloses a stamping part sealed storage device and system based on potential regulation and control, and belongs to the technical field of metal part storage protection. Aiming at the problem that stamping parts are easy to rust in a humid storage environment, the invention provides a working position apparatus scheme integrating electrochemical protection and intelligent environment regulation and control. Comprising a multi-layer potential gradient protection structure which adopts a contact layer sacrificial anode matched with the potential of a stamping part to inhibit galvanic corrosion; according to the convenient sealing system, a drying cavity is constructed through covering of a moisture-proof film and air exhaust sealing; and the intelligent internet-of-things monitoring platform is used for acquiring working position apparatus data in real time and triggering maintenance early warning. Through multi-stage cooperative protection, the storage period of the stamping parts is effectively prolonged, and the storage qualification rate of the stamping parts is remarkably increased.

Description

Technical Field

[0003] The present invention relates to the technical field of storage protection for metal stamping parts, and particularly relates to a sealed storage device for stamping parts based on potential regulation, which is particularly suitable for rust prevention of metal stamping parts stored for a long time in a humid environment. Background Art

[0004] As a core basic component in manufacturing industries such as automobiles, household appliances, and electronic devices, stamping parts are usually produced in a large-scale stocking mode. However, due to supply chain fluctuations or changes in market demand, stamping parts often need to be stored in warehouses for several weeks or even longer. Traditional storage environments generally have problems such as large humidity fluctuations (RH 60%-95%) and insufficient ventilation, resulting in the surface of metal stamping parts being extremely prone to rust due to corrosion. According to statistics, the annual rework cost caused by rusted stamping parts in the automotive industry is as high as billions of yuan, and the inflow of rusted parts into the assembly link may cause serious quality accidents, such as bolt connection failures and seal leaks.

[0005] Currently, the mainstream technologies for rust prevention in stamping part storage in the industry include:

[0006] Oil coating for rust prevention: Coating rust preventive oil or grease on the surface of stamping parts can block water and oxygen in the short term, but there are problems such as environmental pollution, affecting subsequent painting processes, and requiring additional cleaning. Moreover, the oil film is prone to emulsification failure in a humid environment;

[0007] Vapor phase rust prevention packaging: Using corrosion inhibitors to volatilize and form a protective film, but the packaging bag needs to be strictly sealed, and the protection immediately fails after unpacking. Moreover, the protection effect on special-shaped parts and porous parts is poor, and it cannot meet the needs of frequent access;

[0008] Storage in a drying cabinet: Maintaining a low humidity environment (RH < 40%) in the cabinet through a dehumidifier, but the equipment has high energy consumption and high transformation costs. Generally, the unit price exceeds 100,000 yuan, and it is difficult to adapt to the stacking of large stamping parts.

[0009] In addition, the existing technologies generally have the following limitations:

[0010] Single rust prevention method: Only relying on physical barrier or chemical corrosion inhibition, without suppressing rust from the source of the electrochemical corrosion mechanism;

[0011] Complex operation and maintenance: Oil coating requires manual operation, the VCI film needs to be replaced frequently, and the drying cabinet needs to regularly maintain the compressor, increasing labor and time costs;

[0012] Lack of intelligence: Unable to monitor rust risks in real time and give early warnings, relying on manual inspections, and the missed inspection rate is as high as 15%-20%.

[0013] With the advancement of smart manufacturing and green manufacturing concepts, the industry is in urgent need of an efficient, low-consumption, and reusable metal stamping parts anti-rust storage solution that can not only extend the effective storage period of stampings, but also seamlessly connect to the automated storage system. The present invention systematically solves the above pain points by integrating technologies such as electrochemical protection, efficient sealing, and dynamic environmental monitoring, and provides an innovative solution for metal stamping parts storage and anti-rust. Summary of the invention

[0014] In order to solve the above-mentioned problems, the present invention provides a stamping parts sealing storage device and system based on potential regulation.

[0015] In the first aspect, the present invention provides a stamping parts sealed storage device based on potential regulation, which adopts the following technical solution:

[0016] A stamping parts sealed storage device based on potential regulation, comprising:

[0017] The main frame is used to carry the stamping parts;

[0018] A multi-layer potential gradient protection structure is provided in the contact area between the main frame and the stamping part to inhibit electrochemical corrosion;

[0019] A convenient sealing system, comprising a moisture-proof film bag body and a sealing fastening device covering a stamping work station apparatus, a tensioning rope is pre-embedded at the edge of the composite film bag opening, and the sealing fastening device is used to tighten the tensioning rope and compress the sealing strip to form a closed moisture-proof cavity;

[0020] The intelligent IoT monitoring platform is connected to the potential gradient protection structure, the bagging system and the microenvironment monitoring unit for real-time data monitoring and triggering corresponding maintenance response instructions.

[0021] Furthermore, the multi-layer potential gradient protection structure includes: a potential matching contact layer, which is made of a purified alloy with a potential difference of <= 0.1V with the metal material of the stamping part, covering the layer plate and the slot surface of the main frame; a sacrificial anode module, which is detachably embedded in the slot of the main frame, and the sacrificial anode module is a zinc alloy or a magnesium alloy, and is electrically connected to the stamping part through a conductive contact.

[0022] Furthermore, a corrosion visualization window is provided on the surface of the sacrificial anode module, and the window coating gradually changes from green to red as the anode wears out, and an alarm signal is triggered when the wear threshold is greater than or equal to 80%.

[0023] Furthermore, the convenient sealing system includes a preformed moisture-proof film bag, a ratchet fastening device and a negative pressure exhaust interface. The preformed moisture-proof film bag is made of a multi-layer composite film, including an outer tear-resistant PET layer, an intermediate aluminum foil blocking layer and an inner PE electrostatic adsorption layer. The shape of the moisture-proof film bag is adapted to the contour of the stamping workstation equipment. The edge of the bag mouth is coated with silicone and a tensioning rope is pre-embedded; the ratchet fastening device is arranged at the bottom edge of the main frame, which is used to tighten the tensioning rope and compress the sealing strip to form an enclosed moisture-proof cavity; the negative pressure exhaust interface is arranged on the side wall of the moisture-proof film bag, and includes a one-way exhaust valve and a manual vacuum pump connector, which is used to extract the air in the hood after adsorption sealing to form a negative pressure environment of -5kPa to -10kPa.

[0024] Furthermore, a double-layer hot-pressed and sewn rope threading channel is provided at the edge of the bag opening of the moisture-proof film, the channel width is 15-25 mm, and the inner layer is lined with a polyester fiber anti-wear layer.

[0025] Furthermore, the ratchet fastening device includes a ratchet locker and a guide groove. The ratchet locker is installed at the bottom corner of the frame and includes a zinc alloy shell, hardened steel ratchet and a silicone coated handle. The retraction rope length of a single pull stroke is 8-12mm, and the maximum locking force is 150N; the guide groove is distributed in a ring at the bottom of the frame, the groove depth is 4-6mm, and a silicone sealing strip is embedded on the inside, and the compression rate is ≥25%.

[0026] Furthermore, when the negative pressure air extraction interface is connected to an external compressed air source, negative pressure is generated through the Venturi effect.

[0027] Furthermore, the convenient sealing system comprises the following steps:

[0028] S1. Cover the preformed moisture-proof film bag with the stamping station equipment and align the bottom positioning buckle;

[0029] S2. Pull the fastening rope along the guide groove at the bottom of the station apparatus, and further tighten the fastening rope of the bag body through the ratchet fastening device, so that it fits tightly with the rubber sealing strip in the guide groove to form a sealed cavity;

[0030] S3. Connect the manual vacuum pump to the negative pressure interface and extract the air in the hood to a pressure of ≤-5kPa;

[0031] S4. Monitor the humidity indicator window of the desiccant box and replace it with a new desiccant box when the color changes to pink.

[0032] Furthermore, the intelligent Internet of Things monitoring platform includes a distributed sensor array, a wireless communication module, and an early warning logic module. The distributed sensor array includes a temperature and humidity sensor, a potential difference sensor, and an anode corrosion rate sensor. The wireless communication module uses the LoRa or NB-loT protocol to upload data to the cloud server. The early warning logic module pushes a maintenance work order to the terminal when it detects that the anode loss >= 80% and the humidity inside the membrane >= 40% RH.

[0033] Furthermore, the anode corrosion rate sensor adopts a composite technology of the resistance probe method and the electrochemical current measurement method. The probe sensitive element uses a zinc / magnesium alloy thin sheet made of the same material as the sacrificial anode, with a thickness of 0.1 - 0.2 mm, ensuring that the corrosion rate is synchronized with the anode body. Metal corrosion causes the cross-sectional area to decrease and the resistance value to increase. The change rate of resistance ΔR / R0 is measured through a Wheatstone bridge and converted into the corrosion depth. The formula is: corrosion rate = ΔR / (k·R0·t), where k is the material constant and t is the time. The data weight of the resistance method is 70% to reflect the actual corrosion amount, and the weight of the electrochemical current method is 30% to reflect the instantaneous corrosion trend. The corrosion rate calculation formula is:

[0034]

[0035] where the output unit is μm / year (corrosion depth per year) or g / (m 2 ·h) (mass loss rate).

[0036] In summary, the present invention has the following beneficial technical effects:

[0037] The anti-rust stamping part intelligent storage device proposed by the present invention has achieved significant breakthroughs in anti-rust efficiency, operation convenience, cost control, and intelligent management through multi-technology collaborative innovation. The specific technical effects are as follows:

[0038] The galvanic corrosion between the stamping part and the work position appliance is blocked through the potential matching contact layer (potential difference <= 0.1V), combined with the active protection of the sacrificial anode module, reducing the local corrosion current density to <= 0.1 μA / cm 2 , and the rusting rate of the traditional work position appliance is reduced by more than 90%. At the same time, the visual window can display the anode loss status in real time, allowing the operation and maintenance personnel to accurately judge the replacement time and avoid the protection vacuum period caused by anode failure.

[0039] The moisture-proof film bag body uses an aluminum foil - PET - PE composite film, with a moisture permeability rate <= 2 g / (m 2 ·24h). Combined with negative pressure adsorption (-5 kPa to -10 kPa), the bag body is tightly attached to the surface of the work position appliance, effectively blocking the penetration of external water and oxygen. The convenient sealing system realizes three-step operations of "covering - locking - pumping air", with good sealing effect and high execution efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Schematic diagram of a stamping parts sealing storage device and system based on potential regulation according to Example 1 of the present invention;

[0041] Figure 2 This is a schematic structural diagram of a stamping parts sealing storage device based on potential regulation according to Example 1 of the present invention;

[0042] Figure 3 is a schematic structural diagram of a ratchet fastening device according to Embodiment 1 of the present invention;

[0043] Figure 4 Schematic diagram of rope fastening and sealing of moisture-proof bag opening in embodiment 1 of the present invention; DETAILED DESCRIPTION

[0044] The present invention is further described in detail below in conjunction with the accompanying drawings. The described embodiments are only a part of the embodiments of the present invention, rather than all 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.

[0045] Reference Figure 1 , a stamping parts sealed storage device and system based on potential regulation in this embodiment includes:

[0046] The main frame is used to carry the stamping parts;

[0047] A multi-layer potential gradient protection structure is provided in the contact area between the main frame and the stamping part to inhibit electrochemical corrosion;

[0048] A convenient sealing system, comprising a moisture-proof film bag body and a sealing fastening device covering a stamping work station apparatus, a tensioning rope is pre-embedded at the edge of the composite film bag opening, and the sealing fastening device is used to tighten the tensioning rope and compress the sealing strip to form a closed moisture-proof cavity;

[0049] The intelligent IoT monitoring platform is connected to the potential gradient protection structure, the bagging system and the microenvironment monitoring unit for real-time data monitoring and triggering corresponding maintenance response instructions.

[0050] This embodiment aims at the rust problem of the door inner panel stamping parts produced by a certain automobile manufacturer in a humid storage environment. The stamping parts are made of DC04 cold-rolled steel plate with a size of 1200×800×1.2mm. The traditional oil-coating anti-rust solution causes the subsequent electrophoretic coating process to have a defect rate of up to 15% due to the residual oil film, and there is a risk of environmental pollution. This solution realizes long-term oil-free anti-rust storage of stamping parts through a workstation with integrated potential protection, convenient sealing and intelligent monitoring technology.

[0051] Specifically, in this embodiment, the main frame of the workbench appliance is welded from Q235 steel, as Figure 2 shown, with a passivated galvanized steel plate covering the surface, the coating thickness being 20 μm and the passivation film weight being 1.2 g / m 2 . The size of the laminate 1 is 2000×1200 mm, and through passivation treatment, the potential difference between the laminate and the stamping part is stabilized at 0.08 V. The maximum load-bearing capacity of the laminate 1 is 800 kg / m 2 .

[0052] The sacrificial anode module 2 uses Zn-0.2Al alloy anode blocks, with dimensions of 200×100×20 mm and a purity of 99.8%. Two blocks are symmetrically embedded in each layer. The anode is connected to the stamping part through a silver-plated copper contact, the contact resistance <= 0.01 Ω, and the contact pressure is maintained constant by a spring mechanism, with the pressure magnitude being 5 N ± 0.5 N. A 50×50 mm visualization window is opened on the anode surface, covered with a pH-responsive composite film composed of bromocresol purple + phenol red dyes, with a color change range of pH 5.0 - 8.4. When the loss reaches 80%, the color of the window changes from green to red. The intelligent Internet of Things monitoring platform 3 is installed on the side of the workbench appliance, including a distributed sensor array, a wireless communication module, and an early warning logic module. The distributed sensor array includes a temperature and humidity sensor, a potential difference sensor, and an anode corrosion rate sensor; the wireless communication module uses the LoRa or NB-loT protocol to upload data to the cloud server; the early warning logic module, when detecting that the anode loss >= 80% and the humidity inside the film >= 40% RH, pushes a maintenance work order to the terminal.

[0053] A guiding groove 4 and a ratchet fastening device 5 are installed at the bottom of the workbench appliance. The guiding groove 4 is annularly distributed at the bottom of the frame, with a groove depth of 4 - 6 mm, and a silica gel sealing strip is embedded inside, with a compression rate >= 25%; the ratchet fastening device 5 is installed at the bottom corners of the frame, including a zinc alloy housing, hardened steel ratchet teeth, and a silica gel-coated handle. The single pulling stroke shortens the rope length by 8 - 12 mm, and the maximum locking force is 150 N;.

[0054] A convenient sealing system, as Figure 3 shown, there is an annular guiding groove 6 at the bottom of the main frame of the workbench appliance, with a width of 8 mm and a depth of 5 mm. A silica gel sealing strip is provided inside the groove body, and the compression rate of the silica gel sealing strip is 30%. After being pressed, the contact pressure >= 0.1 MPa; the moisture-proof film is composed of a three-layer composite film: the outer layer is a 50 μm PET tear-resistant layer with a tensile strength >= 200 MPa, the middle layer is a 12 μm aluminum foil barrier layer with a pinhole density <= 3 per m 2 , and the inner layer is an 80 μm PE electrostatic adsorption layer with a surface resistance <= 10 6 Ω. The size of the moisture-proof film bag body is 2100×1300×1450 mm, the edge of the bag mouth is coated with a silica gel coating, and a double-layer hot-pressed sewing rope-passing channel is provided, with the channel width being 15 - 25 mm. The inner layer is lined with a polyester fiber wear-resistant layer, and positioning buckles are provided at the four corners of the bag body.

[0055] The main support frame of the ratchet fastening device is fixed on the bottom plate 7 of the workstation fixture frame through the support frame fastening bolt 8. The structure is mainly composed of a main shaft 9, a ratchet disc 11, a return spring 13, a reverse claw 12 and a handle 10. Among them, the ratchet disc 11 is made of hardened steel, with a diameter of 40 mm, 24 ratchet teeth evenly distributed circumferentially, a tooth height of 3 mm, a tooth pitch of 5 mm, and a one-way rotation design, only allowing rotation in the tightening direction; the main shaft 9 is made of stainless steel, with a diameter of 20 mm, and both ends are fixed to the housing through ball bearings; the reverse claw 12 is made of hardened steel, and presses the ratchet teeth through a torsion spring to prevent the rope from loosening back.

[0056] Both ends of the fastening rope at the mouth of the moisture-proof film bag have rope buckles. As Figure 4 shown, after covering the workstation fixture, the A-end rope buckle 16 passes through the other B-end rope buckle 15, and then the A-end rope buckle 16 is pulled back and hung on the traction hook 14 on the ratchet main shaft. By rotating the ratchet fastening device to lock the fastening rope, the silica gel coating at the bag mouth is tightly attached to the silica gel sealing strip in the bottom guide groove 6 of the workstation fixture, forming a sealed cavity.

[0057] Quick-release connectors are installed on the side wall of the moisture-proof film bag body, connected to an external vacuum pump, with a flow rate of 30 L / min and an ultimate vacuum of -95 kPa. The air extraction process is divided into two stages: the first air extraction to -5 kPa and standing for 10 seconds to make the film body fit, and the second air extraction to -8 kPa. After the air extraction is completed, the humidity in the cavity drops from the initial 85% RH to 28% RH.

[0058] The operating steps for manually storing stamping parts in the workstation fixture of this embodiment are as follows:

[0059] S1. The operator uses a forklift to transport the stamping parts to the workstation;

[0060] S2. Stack the stamping parts in the workstation fixture to avoid direct contact between metals;

[0061] S3. The operator unfolds the moisture-proof film bag body and aligns the four-corner positioning marks of the laminate;

[0062] S4. Cover the cover from the top of the workstation fixture downwards to ensure that the inner PE film contacts the surface of the workstation fixture frame without wrinkles;

[0063] S5. Hang both ends of the bag mouth fastening rope on the two hooks of the ratchet fastening device, manually pull the handle, use the ratchet to lock the rope, and at the same time press the rope channel sealing block to strengthen the sealing of the rope opening;

[0064] S6. Insert the quick-release connector of the air extraction pump into the side wall interface of the moisture-proof film bag body;

[0065] S7. Pull the handle evenly and observe the pressure gauge to -8 kPa;

[0066] S8. Close the valve and let it stand still.

[0067] During daily manual inspection, check the humidity inside the sealing cover and the color state of the anode. When the color reaches orange, give an early warning. When it reaches red, replacement is required. Use an insulated screwdriver to loosen the contact fixing bolts, pull out the old anode, polish the new anode with sandpaper, insert it and fix it with bolts again.

[0068] Each station tool is equipped with the following sensors: Temperature and humidity sensor: accuracy ±1.5%RH, temperature ±0.2°C, sampling once every 30 minutes; Electrochemical corrosion probe: three-electrode system, working electrode = stamping part, reference electrode = Ag / AgCl, auxiliary electrode = Pt, measure the polarization resistance Rp.

[0069] The main control chip of the edge computing unit is STM32H743, running the FreeRTOS system, processing sensor data in real time, local storage: MicroSD card (32GB), caching 72 hours of historical data, supporting data transfer when the network is disconnected. The open interface supports seamless integration with systems such as AGV, MES, and WMS, and the warning values of anode loss, temperature, and humidity can be set. When the warning value is reached, corresponding maintenance work orders can be generated and issued.

[0070] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A stamping part sealed storage device based on potential regulation, characterized in that, include: The main frame is used to carry the stamping parts; A multi-layer potential gradient protection structure is provided in the contact area between the main frame and the stamping part to inhibit electrochemical corrosion; A convenient sealing system, comprising a moisture-proof film bag body and a sealing fastening device covering a stamping work station apparatus, a tensioning rope is pre-embedded at the edge of the composite film bag opening, and the sealing fastening device is used to tighten the tensioning rope and compress the sealing strip to form a closed moisture-proof cavity; The intelligent IoT monitoring platform is connected to the potential gradient protection structure, the bagging system and the microenvironment monitoring unit for real-time data monitoring and triggering corresponding maintenance response instructions.

2. The stamping part sealed storage device based on potential regulation according to claim 1, characterized in that, The multi-layer potential gradient protection structure includes: a potential matching contact layer, which is made of a purified alloy with a potential difference of <= 0.1V with the metal material of the stamping part, covering the layer plate and the slot surface of the main frame; a sacrificial anode module, which is detachably embedded in the slot of the main frame, and the sacrificial anode module is a zinc alloy or a magnesium alloy, and is electrically connected to the stamping part through a conductive contact.

3. The stamping part sealed storage device based on potential regulation according to claim 2, wherein The surface of the sacrificial anode module is provided with a corrosion degree visualization window, and the window coating gradually changes from green to red as the anode wears out, and an alarm signal is triggered when the wear threshold is greater than or equal to 80%.

4. The stamping part sealed storage device based on potential regulation according to claim 3, characterized in that, The convenient sealing system includes a preformed moisture-proof film bag, a ratchet fastening device and a negative pressure exhaust interface. The preformed moisture-proof film bag is made of a multi-layer composite film, including an outer tear-resistant PET layer, an intermediate aluminum foil blocking layer and an inner PE electrostatic adsorption layer. The shape of the moisture-proof film bag is adapted to the contour of the stamping workstation equipment. The edge of the bag mouth is coated with silicone and a tensioning rope is pre-embedded; the ratchet fastening device is arranged at the bottom edge of the main frame, which is used to tighten the tensioning rope and compress the sealing strip to form a closed moisture-proof cavity; the negative pressure exhaust interface is arranged on the side wall of the moisture-proof film bag, and includes a one-way exhaust valve and a manual exhaust pump connector, which is used to extract the air in the hood after adsorption sealing to form a negative pressure environment of -5kPa to -10kPa.

5. The stamping part sealed storage device based on potential regulation according to claim 4, characterized in that, The edge of the bag opening of the moisture-proof film is provided with a double-layer hot-pressed and sewn rope threading channel, the channel width is 15-25mm, and the inner layer is lined with a polyester fiber anti-wear layer.

6. The stamping part sealed storage device based on potential regulation according to claim 5, characterized in that, The ratchet fastening device includes a ratchet locker and a guide groove. The ratchet locker is installed at the bottom corner of the frame and includes a zinc alloy shell, hardened steel ratchet teeth and a silicone coated handle. The retraction rope length of a single pull stroke is 8-12mm, and the maximum locking force is 150N; the guide groove is distributed in a ring at the bottom of the frame, the groove depth is 4-6mm, and a silicone sealing strip is embedded on the inside, and the compression rate is ≥25%.

7. A stamping part sealed storage device based on potential regulation according to claim 6, characterized in that, When the negative pressure air extraction interface is connected to an external compressed air source, negative pressure is generated through the Venturi effect.

8. A rust prevention method for stamping parts in storage, characterized in that, The convenient sealing system according to any one of claims 4 to 7 comprises the following steps: S1. Cover the preformed moisture-proof film bag with the stamping station equipment and align the bottom positioning buckle; S2. Pull the fastening rope along the guide groove at the bottom of the station tool, and further tighten the fastening rope of the bag body through the manual ratchet fastening device, so that it fits tightly with the rubber sealing strip in the guide groove to form a sealed cavity; S3. Connect the manual vacuum pump to the negative pressure interface and extract the air in the hood to a pressure of ≤-5kPa; S4. Monitor the humidity indication window of the desiccant cartridge and replace it with a new one when the color turns pink.

9. A stamping part sealed storage system based on potential regulation according to claim 1, characterized in that The intelligent IoT monitoring platform includes a distributed sensor array, a wireless communication module, and an early warning logic module. The distributed sensor array includes a temperature and humidity sensor, a potential difference sensor, and an anode corrosion rate sensor. The wireless communication module uses the LoRa or NB-loT protocol to upload data to the cloud server. The early warning logic module pushes a maintenance work order to the terminal when it detects that the anode loss >= 80% and the humidity in the membrane >= 40% RH.

10. A stamping part sealed storage system based on potential regulation according to claim 9, characterized in that, The anode corrosion rate sensor uses a composite technology of the resistance probe method and the electrochemical current measurement method. The probe sensitive element uses a zinc / magnesium alloy sheet of the same material as the sacrificial anode, with a thickness of 0.1 - 0.2 mm, to ensure that the corrosion rate is synchronized with the anode body. Metal corrosion causes a decrease in the cross-sectional area and an increase in the resistance value. The change rate of resistance ΔR / R0 is measured by a Wheatstone bridge and converted into the corrosion depth. The formula is: corrosion rate = ΔR / (k·R0·t), where k is the material constant and t is the time. 70% of the data weight of the resistance method is used to reflect the actual corrosion amount, and 30% of the weight of the electrochemical current method is used to reflect the instantaneous corrosion trend. The corrosion rate calculation formula is: Among them, the output unit is μm / year (corrosion depth per year) or g / (m 2 ·h) (mass loss rate).

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