Metal pipeline weld zone corrosion control method, device, system, medium and equipment

Abstract

The invention discloses a metal pipeline weld zone corrosion control method, device, system, medium and equipment, and the method comprises the steps: obtaining the potential negative offset data of a target metal pipeline, and carrying out the fitting of the potential negative offset data, so as to obtain a distance-potential negative offset fitting curve, acquiring an attenuation constant value of the target metal pipeline according to the fitting curve; the potential negative offset of the sacrificial anode at the access point of the sacrificial anode is obtained, the potential negative offset of the access point of the sacrificial anode and the attenuation constant value are substituted into an attenuation formula, and the effective protection interval value and the maximum current generation area value of the sacrificial anode are obtained through calculation; the minimum current protection density value of the target metal pipeline is obtained, the output current value of the needed sacrificial anode is calculated by combining the maximum current generation area value and the inner diameter value of the target metal pipeline, and the size of the sacrificial anode is obtained; based on a set of complete calculation model, various data are closely associated, real-time regulation and control can be achieved, and practicability and applicability are good.

Description

Technical Field

[0001] This invention relates to the field of nuclear power corrosion prevention technology, and in particular to a method, device, system, medium and equipment for corrosion control in the weld zone of metal pipelines. Background Technology

[0002] Currently, stainless steel pipes are widely used in industrial production for transporting fire-fighting water, industrial water, and wastewater. The flowing liquids within these pipes act as corrosive media, inevitably leading to corrosion, especially in the weld areas. Welding is a process characterized by uneven temperature distribution, high temperatures, short heating times, and rapid cooling after high temperatures, which reduces the corrosion resistance of the weld area, making it susceptible to pitting and intergranular corrosion. Furthermore, residual stress inevitably exists at the weld location, making stress corrosion more likely, leading to damage or failure of the welded structure. The corrosion mechanism of stainless steel welds is complex, with diverse corrosion forms, and possesses strong concealment and harmfulness, warranting close attention.

[0003] Currently, most methods for corrosion protection of stainless steel pipes include chemical treatment, coating protection, and anodic protection. Chemical treatment uses chemical reactions to form an oxide film on the inner wall of the pipe, but in pipes with high flow rates, physical erosion and peeling can easily occur. Coating protection uses epoxy coatings with high corrosion resistance and good adhesion to protect the pipe, but it is not suitable for small pipes due to the difficulty of application. Anodic protection uses the electrochemical reaction between the anode and cathode for corrosion protection. Common anodic protection methods include cathodic protection and anodic protection. Anodic oxidation and anodic coating are difficult to implement on complex stainless steel pipes, while the impressed current protection method of cathodic protection is suitable for pipes with a large protection range. Sacrificial anode protection is suitable for pipes with a small protection range. However, there is a lack of relevant data on the protection range and service life assessment of a single sacrificial anode.

[0004] Therefore, there is an urgent need to invent a corrosion control method for the weld area of ​​stainless steel pipes, which is prone to corrosion. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method, apparatus, system, medium and equipment for corrosion control in the weld zone of metal pipelines.

[0006] The technical solution adopted by this invention to solve its technical problem is: to construct a method for controlling corrosion in the weld zone of a metal pipeline, comprising the following steps: S10: Obtain the potential negative offset data of the target metal pipe, and fit the potential negative offset data to obtain the distance-potential negative offset fitting curve, and obtain the attenuation constant value of the target metal pipe according to the fitting curve. Obtain the negative potential offset of the sacrificial anode at its connection point, and substitute the negative potential offset of the sacrificial anode's connection point and the attenuation constant value into the attenuation formula (1) to calculate the effective protection range value and the maximum current occurrence area value of the sacrificial anode: (1) In formula (1), U(x) is the negative potential offset at a distance x meters from the anode, in V; U0 is the negative potential offset at the connection point of the sacrificial anode, in V; and α is the attenuation constant. S20: Obtain the minimum current protection density value of the target metal pipe, combine it with the maximum current generation area value and the inner diameter value of the target metal pipe, calculate the required output current value of the sacrificial anode, and obtain the size of the sacrificial anode according to formula (2): (2) In formula (2), I a ρ is the output current of the sacrificial anode, in A; ΔE is the driving voltage, in V; ρ is the resistivity of the liquid medium in the target metal pipe, in Ω·m; L is the length of the sacrificial anode, in m; r is the radius of the sacrificial anode, in m. S30: Obtain the opening size of the target metal pipe based on the size of the sacrificial anode.

[0007] In some embodiments, after S30, the method further includes: S40: Substitute the dimensions of the sacrificial anode into formula (3) to calculate the final output current of the sacrificial anode: (3) In formula (3), I is the final output current of the sacrificial anode, in A; ΔE is the driving voltage, in V; ρ is the resistivity of the liquid medium in the target metal pipe, in Ω·m; L is the length of the sacrificial anode, in m; and r is the radius of the sacrificial anode, in m. The lifetime of the sacrificial anode is calculated by combining formulas (3) and (4): (4) In formula (4), t is the effective lifespan of the sacrificial anode, a; m is the net mass of the sacrificial anode, kg; u is the utilization coefficient of the sacrificial anode; e is the consumption rate of the sacrificial anode, in kg / A·a; and I is the final output current of the sacrificial anode, in A.

[0008] In some embodiments, the target metal pipe includes a stainless steel metal pipe.

[0009] In some embodiments, the sacrificial anode comprises an iron-based sacrificial anode.

[0010] The present invention also provides a corrosion control device for weld zones of metal pipes, used to implement the corrosion control method for weld zones of metal pipes in any of the above embodiments, comprising: The first calculation module is used to acquire the potential negative offset data of the target metal pipe, and fit the potential negative offset data to obtain the distance-potential negative offset fitting curve, and obtain the attenuation constant value of the target metal pipe according to the fitting curve. The first calculation module is also used to obtain the negative potential offset of the sacrificial anode at its connection point, and substitute the negative potential offset of the connection point of the sacrificial anode and the attenuation constant value into the attenuation formula (11) to calculate the effective protection range value and the maximum current occurrence area value of the sacrificial anode: (11) In formula (11), U(x) is the negative potential offset at a distance x meters from the anode, in V; U0 is the negative potential offset at the connection point of the sacrificial anode, in V; and α is the attenuation constant. The second calculation module is used to obtain the minimum current protection density value of the target metal pipe, and calculate the required output current value of the sacrificial anode by combining the maximum current generation area value and the inner diameter value of the target metal pipe. The size of the sacrificial anode is obtained according to formula (2): (12) In formula (2), I a ρ is the output current of the sacrificial anode, in A; ΔE is the driving voltage, in V; ρ is the resistivity of the liquid medium in the target metal pipe, in Ω·m; L is the length of the sacrificial anode, in m; r is the radius of the sacrificial anode, in m. The third calculation module is used to obtain the opening size of the target metal pipe based on the size of the sacrificial anode.

[0011] In some embodiments, the corrosion control device for the weld zone of the metal pipe includes: The fourth calculation module is used to substitute the dimensions of the sacrificial anode obtained by the second calculation module into formula (13) to calculate the final output current of the sacrificial anode: (13) In formula (13), I is the final output current of the sacrificial anode, in A; ΔE is the driving voltage, in V; ρ is the resistivity of the liquid medium in the target metal pipe, in Ω·m; L is the length of the sacrificial anode, in m; and r is the radius of the sacrificial anode, in m. The fourth calculation module is also used to calculate the lifetime of the sacrificial anode according to a combination of formulas (13) and (14): (14) In formula (14), t is the effective lifespan of the sacrificial anode, a; m is the net mass of the sacrificial anode, kg; u is the utilization coefficient of the sacrificial anode; e is the consumption rate of the sacrificial anode, in kg / A·a; and I is the final output current of the sacrificial anode, in A.

[0012] The present invention also provides a corrosion control system for the weld zone of a metal pipe, comprising: Memory and processor; The memory is used to store computer programs; The processor is configured to implement the corrosion control method for weld zones of metal pipes as described in any of the above embodiments when executing one or more programs stored in the memory.

[0013] The present invention also provides a computer-readable storage medium storing a computer program adapted for loading by a processor to perform a corrosion control method for weld zones of metal pipes as described in any of the above embodiments.

[0014] The present invention also provides a computer device including a memory and a processor, wherein the memory stores a computer program, and the processor executes the corrosion control method for weld zones of metal pipes as described in any of the above embodiments by calling the computer program stored in the memory.

[0015] The implementation of this invention has the following beneficial effects: the corrosion control method for weld seams of metal pipes is based on a complete calculation model (including protection range and output current), and is designed for pipes of different diameters and media. Multiple data are closely related and can be adjusted in real time, making it practical and applicable. Attached Figure Description

[0016] To more clearly illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings: Figure 1This is a schematic diagram of the sacrificial anode mounting structure in some embodiments of the present invention; Figure 2 This is a schematic diagram of the protection range of the sacrificial anode in some embodiments of the present invention; Figure 3 This is a schematic diagram of straight pipe welds and tee welds in some embodiments of the present invention, wherein a-straight pipe section weld; b-tee section weld; Figure 4 This is a graph showing the distance to the target pipe versus the negative potential offset in some embodiments of the present invention. Figure 5 This is a schematic diagram of a corrosion control method for welded areas of metal pipes in some embodiments of the present invention. Detailed Implementation

[0017] To provide a clearer understanding of the technical features, objectives, and effects of this invention, specific embodiments are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or element referred to must have a specific orientation; therefore, they should not be construed as limitations on this invention.

[0018] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0019] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0020] like Figure 5 As shown, this invention illustrates a method for controlling corrosion in the weld zone of a metal pipe, comprising the following steps: S10: Obtain the negative potential offset data of the target metal pipe, and fit the negative potential offset data to obtain the distance-potential negative offset fitting curve, and obtain the attenuation constant value of the target metal pipe based on the fitting curve.

[0021] Obtain the negative potential offset of the sacrificial anode at its connection point, and substitute the negative potential offset of the sacrificial anode's connection point and the attenuation constant value into the attenuation formula (1) to calculate the effective protection range value and the maximum current occurrence area value of the sacrificial anode: (1) In formula (1), U(x) is the negative potential offset at a distance x meters from the anode, in V; U0 is the negative potential offset at the connection point of the sacrificial anode (x=0), in V; α is the attenuation constant (m). -1 Among them, the effective range protection value is the value of x when U(x) is greater than 0.1, and the maximum current occurrence area value is the value of x when U(x) is close to 0.

[0022] S20: Obtain the minimum current protection density value of the target metal pipe, combine it with the maximum current generation area value and the inner diameter value of the target metal pipe, calculate the required output current value of the sacrificial anode, and obtain the size of the sacrificial anode according to formula (2): (2) In formula (2), I a ρ is the output current of the sacrificial anode, in A; ΔE is the driving voltage, in V; ρ is the resistivity of the liquid medium in the target metal pipe, in Ω·m; L is the length of the sacrificial anode, in m; r is the radius of the sacrificial anode, in m.

[0023] S30: Obtain the opening size of the target metal pipe based on the size of the sacrificial anode.

[0024] In some embodiments, after S30, the corrosion control method for the weld zone of the metal pipe may further include: S40: substituting the size of the sacrificial anode into formula (3) to calculate the final output current of the sacrificial anode: (3) In formula (3), I is the final output current of the sacrificial anode, in A; ΔE is the driving voltage, in V; ρ is the resistivity of the liquid medium in the target metal pipe, in Ω·m; L is the length of the sacrificial anode, in m; and r is the radius of the sacrificial anode, in m.

[0025] Based on a combination of formulas (3) and (4), the lifetime of the sacrificial anode is calculated: (4) In formula (4), t is the effective lifespan of the sacrificial anode, a; m is the net mass of the sacrificial anode, kg; u is the utilization coefficient of the sacrificial anode; e is the consumption rate of the sacrificial anode, in kg / A·a; and I is the final output current of the sacrificial anode, in A.

[0026] In some embodiments, the target metal pipe includes a stainless steel metal pipe.

[0027] In some embodiments, the sacrificial anode comprises an iron-based sacrificial anode. The type of sacrificial anode can be selected according to actual needs; in this embodiment, the sacrificial anode is generally cylindrical.

[0028] In this embodiment, the installation location and method of the added sacrificial anode should be adjusted according to the size and volume of the weld zone of the applied metal pipe (such as a stainless steel pipe), and different sizes of sacrificial anodes should be used. By calculating the protection area, service life, and current of the sacrificial anode, it can be determined whether it is suitable for the weld zone of the metal pipe (such as a stainless steel pipe), and the sacrificial anode volume size within a certain range can be determined for the protection area within different ranges.

[0029] First, starting from the principle, the working principle of the sacrificial anode is to use the sufficiently negative potential of the sacrificial anode itself. This potential is more negative than the equilibrium potential of the most active anode point on the surface of the protected structure after polarization, so that it is corroded before the protected structure. This releases current to make the cathode of the protected structure cathode polarize to the required potential and thus form protection. The released current is driven by the driving voltage formed by the sufficiently negative closed-loop potential of the sacrificial anode and the potential of the protected structure after polarization.

[0030] The released current is calculated using Ohm's law as follows: the sacrificial anode output current. formula; In the formula, ΔE is the driving voltage and R is the circuit resistance.

[0031] The circuit resistance R is calculated using the following formula. Usually, the circuit resistance R is the resistance value of the anode water connection resistance. In the formula: ρ is the resistivity of the liquid medium, Ω·m; L is the length of the sacrificial anode, m; r is the radius of the sacrificial anode, m; By combining all the above formulas, the sacrificial anode output current I can be calculated. a The relationship with the sacrificial anode size is as follows: Adjust the size of the sacrificial anode according to the actual situation, and adjust the cross-sectional area and length of the sacrificial anode.

[0032] The negative offset of the potential of the sacrificial anode inside the pipe decreases along the length of the pipe, and the calculation method is as follows: In the formula: U(x) is the negative potential offset (or negative offset potential) at a distance x (meters) from the anode, in V; U0 is the negative potential offset (or negative offset potential) at the sacrificial anode connection position (x=0), in V; α is the attenuation constant (m). -1 It is obtained by measuring and calculating the potential of the target pipeline and fitting it with an attenuation formula.

[0033] The sacrificial anode lifetime is calculated using the following formula: Where: t is the effective lifespan of the anode, a; m is the net mass of the anode, kg; u is the utilization coefficient of the anode; e is the consumption rate of the anode, kg / A·a; I is the output current of the determined sacrificial anode, A; Through the above calculations, a corrosion prevention method for the weld zone of a specific pipeline can be designed. By selecting the target pipeline and measuring the attenuation constant of the negative potential offset, and calculating the protection range of the sacrificial anode, the opening location range can be determined. Then, the output current of the sacrificial anode is calculated based on the current generation area. The sacrificial anode size is selected based on the output current of the sacrificial anode, the diameter of the target pipeline (when the pipeline wall thickness is small, the inner diameter or outer diameter of the pipeline can be selected), and the opening size of the target pipeline is determined. Finally, the lifespan of the sacrificial anode is calculated based on the available conditions, and the replacement cycle of the sacrificial anode can be calculated.

[0034] like Figure 3 As shown, compared to straight pipes, tee pipes have more weld seams and a greater risk of corrosion. Therefore, using tee pipes for this explanation is more intuitive. Figure 3 In the diagram, 'a' represents the weld seam of the straight pipe section, and 'b' represents the weld seam of the tee section. Taking a 304 austenitic stainless steel industrial water pipeline with an inner diameter of 317mm and a thickness of 4mm in a power plant as an example, and using iron-based sacrificial anodes as an example, the total weld seam length of the straight pipe section is 996mm, with the main pipeline axially distributed in one plane; while the weld seam length at the equal-diameter tee position reaches 1211mm, and the axial distribution of the main pipeline reaches 317mm, with the weld seam length exceeding that of the straight pipe section by 22%, and the distribution range is larger.

[0035] A section of 304 austenitic stainless steel pipe was selected from the industrial water system, and its potential was measured. The following data were obtained, as shown in Table 1: Table 1 Based on the above data, the fitted curve is as follows: Figure 4 As shown, the attenuation constant value of the stainless steel pipe in the system is 0.114m. -1 Iron-based sacrificial anodes were used to protect the pipeline of this system. The measured negative potential offset at the connection point of the iron-based sacrificial anode was 0.19V. Substituting the data into the attenuation formula, we obtain: Based on the protection criterion of "potential negative offset of 0.1V", the effective protection range of the iron-based sacrificial anode can be calculated to be approximately 5.6m to the left and right of the sacrificial anode. Therefore, the farthest end of the pipe weld should be no more than 5.6m away from the sacrificial anode. In addition, considering convenience and protection effect, the sacrificial anode should be installed as close as possible to the tee branch pipe.

[0036] According to the attenuation formula, when the distance to the sacrificial anode exceeds 25m, its negative potential offset is already very small. Therefore, the maximum current generation area of ​​a single sacrificial anode is 50m, which is 25m before and after it. This can be understood as the maximum current generation area, i.e., the range of x when U(x) is close to 0, is -25m to 25m in this example. The effective protection range is used to determine the installation location range. According to the protection criterion of "negative potential offset of 0.1V", U(x) must be greater than 0.1V, which in this example is 5.6m to the left and right of the sacrificial anode.

[0037] The minimum current protection density for pipelines is taken as 5mA / m. 2 (These are empirical or measured values, known parameters). Therefore, the required output current of the sacrificial anode must be greater than 249mA (i.e., 0.249A), which can be calculated using the formula I = π × D. 管道 × L 管道 × i, where I is the required output current value of the sacrificial anode, and D 管道The inner diameter of the pipe is taken (i.e., 317mm = 0.317m). Of course, in some embodiments, the outer diameter can also be used; this is not specifically limited here. 管道 The length is 50m, and i is the minimum current protection density of the pipeline, taken as 5mA / m. 2 .

[0038] The dimensions of the sacrificial anode must meet the requirements of the following formula: The resistivity of the industrial water pipeline was measured to be 2.03 Ω·m, and the driving voltage of the iron-based sacrificial anode was 0.23 V. Based on the pipe diameter and to minimize the impact on the medium flow, L was chosen to be 5 cm, and r was chosen to be 6.5 cm (diameter 13 cm), satisfying the requirements of the above formula. At this point, the pipe opening size is approximately 14 cm, slightly larger than the diameter of the sacrificial anode (13 cm).

[0039] The density of the iron-based sacrificial anode is 7.8 g / cm³. 3 Given this size, its calculated mass is 5.17 kg, the consumption rate is 9.5 kg / A·a, the anode utilization factor is 0.9, and the output current is 0.287 A (substituting...). Then the lifetime of the sacrificial anode is: The corrosion control method for weld seams of metal pipes of the present invention confirms the size and location of the sacrificial anode. The sacrificial anode is 5cm long and 6.5cm in radius. The pipe opening size is about 14cm. The opening location is selected as close as possible to the tee branch pipe without affecting convenience, and the distance from the farthest end of the weld to the sacrificial anode is ensured to be no more than 5.6m. The lifespan of the sacrificial anode is calculated to be about 1.71 years.

[0040] like Figure 1 and Figure 2 As shown, in the actual installation of the sacrificial anode, after the target pipe is drilled, it is tapped, and then the rubber gasket, bolt and sacrificial anode are installed; the connection between the sacrificial anode and the bolt is a rigid connection, with a steel core extending from the lower end of the bolt. The steel core is inserted into the sacrificial anode and the steel core is connected to the sacrificial anode with resin glue. The function of the steel core is to ensure good electrical connection between the sacrificial anode and the pipe and to provide support for the sacrificial anode.

[0041] This corrosion control method for metal pipeline weld zones, based on a complete calculation model (including protection range, output current, and anode life), is designed for pipelines of different diameters and media. Multiple data points are closely correlated, allowing for real-time adjustment. It demonstrates good practicality and applicability, and has significant engineering value. It can focus on localized enhanced protection of the weld zone, a high-risk corrosion area, addressing the weakest link at minimal cost, offering higher cost-effectiveness compared to protecting the entire pipeline system. Simultaneously, through precise control, it significantly extends the safe service life of the pipeline, reducing production downtime losses and safety risks caused by pipeline corrosion and leakage.

[0042] In some embodiments, the present invention also provides a corrosion control device for the weld zone of a metal pipe, used to implement the corrosion control method for the weld zone of a metal pipe in any of the above embodiments, comprising: The first calculation module is used to acquire the potential negative offset data of the target metal pipe, and fit the potential negative offset data to obtain the distance-potential negative offset fitting curve, and obtain the attenuation constant value of the target metal pipe based on the fitting curve.

[0043] The first calculation module is also used to obtain the negative potential offset of the sacrificial anode at its connection point. Substituting the negative potential offset of the sacrificial anode's connection point and the attenuation constant value into the attenuation formula (11), the effective protection range value and the maximum current occurrence area value of the sacrificial anode are calculated: (11) In formula (11), U(x) is the negative potential offset at a distance x meters from the anode, V; U0 is the negative potential offset at the connection point of the sacrificial anode (x=0), V; α is the attenuation constant (m). -1 Among them, the effective range protection value is the value of x when U(x) is greater than 0.1, and the maximum current occurrence area value is the value of x when U(x) is close to 0.

[0044] The second calculation module is used to obtain the minimum current protection density value of the target metal pipe, combine it with the maximum current generation area value and the inner diameter value of the target metal pipe, calculate the required output current value of the sacrificial anode, and obtain the size of the sacrificial anode according to formula (2): (12) In formula (2), I a ρ is the output current of the sacrificial anode, in A; ΔE is the driving voltage, in V; ρ is the resistivity of the liquid medium in the target metal pipe, in Ω·m; L is the length of the sacrificial anode, in m; r is the radius of the sacrificial anode, in m.

[0045] The third calculation module is used to obtain the opening size of the target metal pipe based on the size of the sacrificial anode.

[0046] In some embodiments, the corrosion control device for the weld zone of the metal pipe further includes: The fourth calculation module is used to substitute the dimensions of the sacrificial anode obtained by the second calculation module into formula (13) to calculate the final output current of the sacrificial anode: (13) In formula (13), I is the final output current of the sacrificial anode, in A; ΔE is the driving voltage, in V; ρ is the resistivity of the liquid medium in the target metal pipe, in Ω·m; L is the length of the sacrificial anode, in m; and r is the radius of the sacrificial anode, in m.

[0047] The fourth calculation module is also used to calculate the lifetime of the sacrificial anode based on a combination of formulas (13) and (14): (14) In formula (14), t is the effective lifespan of the sacrificial anode, a; m is the net mass of the sacrificial anode, kg; u is the utilization coefficient of the sacrificial anode; e is the consumption rate of the sacrificial anode, in kg / A·a; and I is the final output current of the sacrificial anode, in A.

[0048] The present invention also provides a corrosion control system for weld zones of metal pipes, comprising: a memory and a processor; the memory is used to store computer programs; the processor is used to implement the corrosion control method for weld zones of metal pipes as described in any of the above embodiments when executing one or more programs stored in the memory.

[0049] The present invention also provides a computer-readable storage medium storing a computer program adapted for loading by a processor to perform a corrosion control method for weld zones of metal pipes as described in any of the above embodiments.

[0050] The present invention also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the corrosion control method for welded areas of metal pipes as described in any of the above embodiments by calling the computer program stored in the memory.

[0051] The processor of this invention provides computing and control capabilities to support the operation of the entire system. It should be understood that, in the embodiments of this application, the processor may be a Central Processing Unit (CPU), but it can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0052] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0053] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0054] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A method for controlling corrosion in a weld zone of a metal pipe, characterized by, The method comprises the following steps: S10: Obtain potential negative offset data of the target metal pipeline, and fit the potential negative offset data to obtain a fitting curve of distance-potential negative offset, and obtain an attenuation constant value of the target metal pipeline according to the fitting curve; Obtain the potential negative offset of the sacrificial anode at its access point, and substitute the potential negative offset of the access point of the sacrificial anode and the attenuation constant value into the attenuation formula (1) to obtain the effective protection interval value and the maximum current occurrence area value of the sacrificial anode: （1） In formula (1), U(x) is the potential negative offset at a distance of x meters from the anode, and the unit is V; U0 is the potential negative offset of the access point of the sacrificial anode, and the unit is V; and a is the attenuation constant; S20: Obtain the minimum current protection density value of the target metal pipeline, combine the maximum current occurrence area value and the inner diameter value of the target metal pipeline, calculate the required output current value of the sacrificial anode, and obtain the size of the sacrificial anode according to formula (2): （2） wherein in formula (2), I a is the output current value of the sacrificial anode, in A; DE is the driving voltage, in V; p is the resistivity of the liquid medium in the target metal pipeline, in Ω-m; L is the length of the sacrificial anode, in m; and r is the radius of the sacrificial anode, in m. S30: Obtain the opening size of the target metal pipeline according to the size of the sacrificial anode.

2. The method for controlling corrosion of a weld zone of a metal pipe according to claim 1, characterized by, After S30, the following steps are further included: S40: Substitute the size of the sacrificial anode into formula (3) to obtain the final output current of the sacrificial anode: （3） In formula (3), I is the final output current of the sacrificial anode, and the unit is A; ΔE is the driving voltage, and the unit is V; p is the resistivity of the liquid medium in the target metal pipeline, and the unit is Ω·m; L is the length of the sacrificial anode, and the unit is m; and r is the radius of the sacrificial anode, and the unit is m; According to the combination of formula (3) and formula (4), the service life of the sacrificial anode is calculated: （4） In formula (4), t is the effective service life of the sacrificial anode, a; m is the net mass of the sacrificial anode, kg; u is the utilization coefficient of the sacrificial anode; e is the consumption rate of the sacrificial anode, kg / A·a; and I is the final output current of the sacrificial anode, A.

3. The method for control of corrosion in the weld zone of a metal pipe according to claim 1, characterized by, The target metal pipeline comprises a stainless steel metal pipeline.

4. The method for control of corrosion in the weld zone of a metal pipe according to claim 1, characterized by, The sacrificial anode comprises an iron-based sacrificial anode.

5. A metal pipe weld zone corrosion control device for implementing the metal pipe weld zone corrosion control method according to any one of claims 1 to 4, characterized by, The method comprises the following steps: A first calculation module is configured to obtain potential negative offset data of a target metal pipeline, fit the potential negative offset data to obtain a fitting curve of distance-potential negative offset, and obtain an attenuation constant value of the target metal pipeline according to the fitting curve; The first calculation module is further configured to obtain the potential negative offset of the sacrificial anode at its access point, substitute the potential negative offset of the access point of the sacrificial anode and the attenuation constant value into the attenuation formula (11) to obtain the effective protection interval value and the maximum current occurrence area value of the sacrificial anode: （11） In formula (11), U(x) is the potential negative offset at a distance of x meters from the anode, and the unit is V; U0 is the potential negative offset of the access point of the sacrificial anode, and the unit is V; and a is the attenuation constant; The second calculation module is configured to obtain a minimum current protection density value of the target metal pipeline, combine the maximum current generation area value and an inner diameter value of the target metal pipeline, calculate an output current value of the required sacrificial anode, and obtain the size of the sacrificial anode according to formula (2): （12） wherein in formula (2), I a is the output current value of the sacrificial anode, in A; DE is the driving voltage, in V; p is the resistivity of the liquid medium in the target metal pipeline, in Ω-m; L is the length of the sacrificial anode, in m; and r is the radius of the sacrificial anode, in m. The third calculation module is configured to obtain an opening size of the target metal pipeline according to the size of the sacrificial anode.

6. The metal pipe weld zone corrosion control apparatus of claim 5, wherein, The metal pipeline weld area corrosion control device further comprises: The fourth calculation module is configured to substitute the size of the sacrificial anode obtained by the second calculation module into formula (13) to calculate a final output current of the sacrificial anode: （13） In formula (13), I represents the final output current of the sacrificial anode, and the unit is A; ΔE represents a driving voltage, and the unit is V; p represents the resistivity of a liquid medium in the target metal pipeline, and the unit is Ω·m; L represents the length of the sacrificial anode, and the unit is m; and r represents the radius of the sacrificial anode, and the unit is m. The fourth calculation module is further configured to calculate the service life of the sacrificial anode according to formula (13) and formula (14): （14） In formula (14), t represents the effective service life of the sacrificial anode, a; m represents the net mass of the sacrificial anode, kg; u represents the utilization coefficient of the sacrificial anode; e represents the consumption rate of the sacrificial anode, and the unit is kg / A·a; and I represents the final output current of the sacrificial anode, and the unit is A.

7. A metal pipe weld zone corrosion control system characterized by, Comprise: a memory and a processor; The memory is configured to store a computer program; The processor is configured to implement the metal pipeline weld area corrosion control method according to any one of claims 1 to 4 when executing one or more programs stored in the memory.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program is adapted to be loaded by the processor to execute the metal pipeline weld area corrosion control method according to any one of claims 1 to 4.

9. A computer device, comprising: Comprise a memory and a processor, the memory stores a computer program, and the processor executes the metal pipeline weld area corrosion control method according to any one of claims 1 to 4 by calling the computer program stored in the memory.

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