Corrosion sensor, corrosion detection system, corrosion detection method, program and storage medium

Abstract

Detects sulfide corrosion. [Solution] The corrosion sensor according to the present disclosure is a corrosion sensor for detecting sulfur corrosion, comprising a first member mainly composed of copper, a second member mainly composed of copper, and a brazed portion formed by brazing the first member and the second member together, wherein the first member and the second member are electrically connected via the brazed portion.

Description

Technical Field

[0001] The present disclosure relates to a corrosion sensor for detecting sulfide corrosion, a corrosion detection system, a corrosion detection method, a program, and a storage medium.

Background Art

[0002] Patent Document 1 discloses a refrigeration cycle device for detecting corrosion of a refrigerant pipe. The refrigeration cycle device described in Patent Document 1 includes an ACM (Atmospheric Corrosion Monitor) sensor for detecting a corrosion current.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, it has been required to detect sulfide corrosion.

[0005] Therefore, an object of the present disclosure is to solve the above problems and provide a corrosion sensor for detecting sulfide corrosion, a corrosion detection system, a corrosion detection method, a program, and a storage medium.

Means for Solving the Problems

[0006] A corrosion sensor according to an aspect of the present disclosure is a corrosion sensor for detecting sulfide corrosion, including a first member mainly composed of copper, a second member mainly composed of copper, and a brazed portion brazing the first member and the second member, wherein the first member and the second member are electrically connected through the brazed portion.

[0007] A corrosion detection system according to one aspect of the present disclosure is a corrosion detection system for detecting sulfur corrosion, comprising: a first member mainly composed of copper; a second member mainly composed of copper; a brazed joint formed by brazing the first member and the second member; a power supply connected to the first member and the second member for applying voltage or current; a measuring unit connected to the first member and the second member for measuring a measurement current and a measurement voltage; and a control device for controlling the power supply and the measuring unit, wherein the first member and the second member are electrically connected via the brazed joint, the control device applies the applied voltage or applied current between the first member and the second member using the power supply, measures the measurement current and the measurement voltage between the first member and the second member using the measuring unit, calculates the combined resistance of the first member, the second member and the brazed joint based on the measurement current and the measurement voltage, and detects sulfur corrosion based on the combined resistance.

[0008] A corrosion detection system according to one aspect of the present disclosure is a corrosion detection system for detecting sulfide corrosion, comprising: a first member mainly composed of copper; a second member mainly composed of copper; a brazed joint formed by brazing the first member and the second member; a power supply connected to the first member and the second member for applying voltage or current; a measuring unit connected to the first member and the second member for measuring a measurement current or a measurement voltage; and a control device for controlling the power supply and the measuring unit, wherein the control device applies the voltage or current between the first member and the second member using the power supply, detects the presence or absence of continuity between the first member and the second member based on the measurement current or measurement voltage measured by the measuring unit, and detects sulfide corrosion based on the presence or absence of continuity.

[0009] A corrosion detection method according to one aspect of the present disclosure is a corrosion detection method for detecting sulfide corrosion, comprising: a first member mainly composed of copper; a second member mainly composed of copper; and a brazed joint formed by brazing the first member and the second member, wherein the first member and the second member are electrically connected via the brazed joint, the method includes the steps of: applying a current or voltage to a corrosion sensor; measuring a measurement voltage between the first member and the second member; measuring a measurement current between the first member and the second member; calculating the combined resistance of the first member, the brazed joint and the second member based on the measurement voltage and the measurement current; and detecting sulfide corrosion based on the combined resistance value.

[0010] A corrosion detection method according to one aspect of the present disclosure is a corrosion detection method for detecting sulfide corrosion, comprising the steps of: applying a current or voltage to a corrosion sensor comprising a first member mainly composed of copper, a second member mainly composed of copper, and a brazed portion formed by brazing the first member and the second member together; detecting whether or not there is conductivity between the first member and the second member; and detecting sulfide corrosion based on the presence or absence of conductivity.

[0011] A program according to one aspect of this disclosure causes a processor to execute the corrosion detection method described above.

[0012] A storage medium in one aspect of the present disclosure is a non-temporary computer-readable storage medium on which a computer program is stored, and the above-described corrosion detection method is realized when the computer program is executed by a processor. [Effects of the Invention]

[0013] According to this disclosure, sulfidation corrosion can be detected. [Brief explanation of the drawing]

[0014] [Figure 1] This is a schematic diagram of an example of a corrosion detection system according to Embodiment 1 of the present disclosure. [Figure 2]It is a schematic cross-sectional view of the corrosion sensor of FIG. 1 cut along line A-A. [Figure 3] It is a flowchart showing an example of the operation of the corrosion detection system according to Embodiment 1 of the present disclosure. [Figure 4] It is a schematic diagram showing the configuration of the corrosion sensor used in the simulation. [Figure 5] It is a graph showing an example of the simulation result showing the relationship between the corrosion progress distance and the combined resistance. [Figure 6] It is a schematic diagram of the corrosion detection system according to Modification 1. [Figure 7] It is a flowchart showing an example of the operation of the corrosion detection system according to Embodiment 2 of the present disclosure.

Embodiments for Carrying Out the Invention

[0015] (Background Leading to the Present Disclosure) For example, the refrigeration cycle device described in Patent Document 1 is disclosed to detect local corrosion based on the corrosion current detected by an ACM sensor.

[0016] However, such corrosion detection can detect corrosion due to electrochemical phenomena, but cannot detect copper sulfide corrosion. For example, in an environment where a large amount of hydrogen sulfide exists, such as a hot spring area, a member mainly composed of copper is used, and there is a problem that it will penetrate due to sulfide corrosion.

[0017] Therefore, the present inventors studied the configuration of a corrosion sensor capable of detecting sulfide corrosion, and arrived at the following disclosure.

[0018] Hereinafter, an embodiment of the present disclosure will be described with reference to the accompanying drawings. Note that the following description is merely illustrative in nature and is not intended to limit the present disclosure, its applications, or its uses. Furthermore, the drawings are schematic, and the ratios of the respective dimensions etc. do not necessarily match the actual ones.

[0019] In addition, in this specification, terms such as "first" and "second" are used only for the purpose of explanation and should not be understood as indicating or implying relative importance or the order of technical features. The features limited to "first" and "second" indicate or imply including one or more of the said features.

[0020] (Embodiment 1) [Corrosion Detection System] FIG. 1 is a schematic diagram of an example of a corrosion detection system 1 according to Embodiment 1 of the present disclosure. In FIG. 1, the X, Y, and Z directions indicate the longitudinal direction, the lateral direction, and the thickness direction of the corrosion sensor 2A, respectively.

[0021] As shown in FIG. 1, the corrosion detection system 1 includes a corrosion sensor 2A and a control device 3.

[0022] The corrosion detection system 1 is a system for detecting sulfidation corrosion. In the corrosion detection system 1, the corrosion sensor 2A is arranged near an object for which sulfidation corrosion is to be detected, and sulfidation corrosion is reproduced in the corrosion sensor 2A. The control device 3 monitors the combined resistance of the corrosion sensor 2A and detects sulfidation corrosion based on the combined resistance.

[0023] The corrosion sensor 2A includes a first member 10, a second member 20, a brazing portion 30, a power source 40, a measurement portion 50, and a protective layer 60.

[0024] The first member 10 and the second member 20 are members mainly composed of copper. For example, the first member 10 is formed of oxygen-free copper or a copper alloy. Also, the first member 10 and the second member 20 contain phosphorus. For example, the phosphorus concentration in the first member 10 and the second member 20 is 0.4% or less.

[0025] The first member 10 and the second member 20 are coated for corrosion prevention. The coating may be, for example, a coating with an epoxy-based paint or a zinc-rich paint. Alternatively, a urethane-based paint may be overcoated to improve the ultraviolet resistance.

[0026] The first member 10 and the second member 20 have, for example, a plate shape. Specifically, the first member 10 has a first main surface PS1 and a second main surface PS2 located on the opposite side of the first main surface PS1. The second member 20 has a third main surface PS3 and a fourth main surface PS4 located on the opposite side of the third main surface PS3.

[0027] The first member 10 and the second member 20 are arranged so that parts of them overlap each other. Specifically, in the thickness direction of the first member 10 and the second member 20, a part of the first member 10 and a part of the second member 20 overlap such that the second main surface PS2 of the first member 10 and the third main surface PS3 of the second member 20 face each other.

[0028] The brazed portion 30 is the part where the first member 10 and the second member 20 are brazed together. The brazed portion 30 is provided between the first member 10 and the second member 20, and is the part where the first member 10 and the second member 20 are joined by solder.

[0029] The brazed portion 30 contains phosphorus. The phosphorus concentration in the brazed portion 30 is higher than the phosphorus concentration in the first member 10 and the second member 20. For example, the phosphorus concentration in the brazed portion 30 is between 5% and 8%. For example, the brazed portion 30 is formed of phosphorus copper solder or silver solder.

[0030] The first member 10 and the second member 20 are electrically connected via the brazed joint 30. That is, current flows between the first member 10 and the second member 20 through the brazed joint 30.

[0031] Figure 2 is a schematic cross-sectional view obtained by cutting the corrosion sensor 2A in Figure 1 along line AA.

[0032] As shown in Figure 2, the first member 10 and the second member 20 have an arc-shaped curve. The brazed portion 30 joins the first member 10 and the second member 20 with a portion of the first member 10 and a portion of the second member 20 overlapping.

[0033] For example, a structure consisting of a first member 10, a second member 20, and a brazed joint 30 may be manufactured by brazing a cylindrical copper tube and then cutting it. For example, an arc-shaped structure can be manufactured by cutting the copper tube with multiple planes passing through its axial direction.

[0034] Furthermore, the structure consisting of the first member 10, the second member 20, and the brazed portion 30 may have a shape similar to that of the refrigerant piping of the heat exchanger of the refrigeration cycle device. Also, the materials used to form the first member 10, the second member 20, and the brazed portion 30 may be the same as those used for the refrigerant piping of the heat exchanger of the refrigeration cycle device.

[0035] Returning to Figure 1, the power supply 40 is electrically connected to the first member 10 and the second member 20. For example, the power supply 40 is connected to the first member 10 and the second member 20 via a second lead wire 70B. The second lead wire 70B is connected to the first member 10 and the second member 20 via a third terminal 73 and a fourth terminal 74, which will be described later.

[0036] The power supply 40 applies current or voltage between the first member 10 and the second member 20. For example, the power supply 40 applies a constant current or constant voltage between the first member 10 and the second member 20. That is, the power supply 40 is a constant current source or a constant voltage source.

[0037] The measuring unit 50 is connected to the first member 10 and the second member 20, and measures the measurement voltage and measurement current. The measuring unit 50 is connected to the first member 10 and the second member 20 by four terminals 71 to 74.

[0038] The measuring unit 50 includes a voltmeter 51 and an ammeter 52.

[0039] The voltmeter 51 is connected to the first member 10 and the second member 20 via a first lead wire 70A. The first lead wire 70A is connected to the first member 10 via a first terminal 71 and to the second member 20 via a second terminal 72. The first terminal 71 is provided on the first member 10. The second terminal 72 is provided on the second member 20. The voltmeter 51 measures the voltage across the first member 10, the second member 20, and the brazed joint 30.

[0040] The ammeter 52 is connected to the first member 10 and the second member 20 via a second lead wire 70B. The second lead wire 70B is connected to the first member 10 via a third terminal 73 and to the second member 20 via a fourth terminal 74. The third terminal 73 is provided on the first member 10. The fourth terminal 74 is provided on the second member 20. The ammeter 52 measures the current flowing through the first member 10, the second member 20 and the brazed joint 30.

[0041] The protective layer 60 has electrical insulating properties and covers a portion of the first member 10 and the second member 20. For example, the protective layer 60 is made of an electrically insulating resin. The protective layer 60 may be, for example, an epoxy resin or a phenolic resin. The protective layer 60 covers, for example, the first main surface PS1 of the first member 10 and the third main surface PS3 of the second member 20. That is, the second main surface PS2 of the first member 10 and the fourth main surface PS4 of the second member 20 are not covered by the protective layer 60 and are exposed.

[0042] The control device 3 controls the corrosion sensor 2A. Specifically, the control device 3 controls the power supply 40 and the measuring unit 50.

[0043] The control device 3 includes, for example, a processor and a memory device. In the control device 3, the processor executes a program or instruction stored in the memory device to realize a predetermined function. The function of the control device 3 may be realized by hardware alone, or by a combination of hardware and software.

[0044] The processor may be, for example, a processing circuit such as a CPU (Central Processing Unit). The storage device may be, for example, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, DVD or other optical disc storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage devices.

[0045] [Examples of corrosion sensor usage] The corrosion sensor 2A can be used, for example, by placing it near the heat exchanger of a refrigeration cycle system. The refrigeration cycle system is, for example, an air conditioner. The heat exchanger of the air conditioner has copper refrigerant piping. Multiple pipes are connected by brazing. If the outdoor unit of the air conditioner is located in a hydrogen sulfide-rich area, sulfidation corrosion may occur in the refrigerant piping and its brazed joints of the heat exchanger of the outdoor unit. Therefore, by placing the corrosion sensor 2A near the heat exchanger, sulfidation corrosion of the refrigerant piping can be reproduced and monitored by the corrosion sensor 2A. The corrosion sensor 2A may also be placed near the heat exchanger of the indoor unit.

[0046] Although an air conditioner was described as an example of a refrigeration cycle device, any device equipped with a refrigeration cycle, such as a refrigerator, is acceptable.

[0047] [Operation of the corrosion detection system] An example of the operation of the corrosion detection system 1 will be explained using Figure 3. Figure 3 is a flowchart illustrating an example of the operation of the corrosion detection system 1 according to Embodiment 1 of this disclosure.

[0048] As shown in Figure 3, in step ST1, the control device 3 controls the power supply 40 and applies a voltage or current between the first member 10 and the second member 20. Specifically, the control device 3 applies a constant voltage or constant current between the first member 10 and the second member 20 using the power supply 40.

[0049] In step ST2, the voltmeter 51 of the measuring unit 50 measures the voltage between the first member 10 and the second member 20.

[0050] In step ST3, the ammeter 52 of the measuring unit 50 measures the current between the first member 10 and the second member 20.

[0051] In step ST4, the control device 3 calculates the combined resistance of the first member 10, the brazed joint 30, and the second member 20 based on the measured voltage and measured current. For example, the control device 3 calculates the combined resistance from the measured voltage and measured current using Ohm's law.

[0052] In step ST5, the control device 3 detects sulfidation corrosion based on the combined resistance value. When sulfidation corrosion occurs in the first member 10, the brazed joint 30, and the second member 20, the combined resistance increases. When the combined resistance exceeds a predetermined threshold, the control device 3 determines that sulfidation corrosion has occurred.

[0053] Furthermore, the control device 3 may determine the degree of sulfidation corrosion based on the combined resistance. The combined resistance increases in proportion to the progression of sulfidation corrosion. Therefore, the control device 3 can determine that sulfidation corrosion is progressing as the combined resistance increases. For example, the control device 3 stores multiple threshold values ​​for the combined resistance corresponding to the degree of sulfidation corrosion. The control device 3 determines the degree of sulfidation corrosion based on the combined resistance and the multiple threshold values.

[0054] Furthermore, the control device 3 may predict penetration due to sulfidation corrosion based on the combined resistance. Based on the change in combined resistance, the control device 3 predicts penetration due to sulfidation corrosion in at least one of the first member 10, the brazed portion 30, and the second member 20.

[0055] In this way, sulfur corrosion can be detected based on the combined resistance of the first member 10, the brazed portion 30, and the second member 20.

[0056] [simulation] An example of a simulation of corrosion detection system 1 is explained using Figures 4 and 5. Figure 4 is a schematic diagram showing the configuration of the corrosion sensor used in the simulation. Figure 5 is a graph showing an example of the simulation results illustrating the relationship between corrosion progression distance and combined resistance. Figure 5 shows the results of monitoring sulfide corrosion using the corrosion sensor shown in Figure 4. The simulation was performed using Microsoft Excel.

[0057] As shown in Figure 4, the first member 10 and the second member 20 were made of copper plates with a width of 1 mm and a thickness of 0.2 mm. The first member 10 and the second member 20 were arranged so that they overlapped by 1 mm. A brazed joint 30 was placed between the first member 10 and the second member 20. The brazed joint 30 was made of a phosphorus-copper alloy with a width of 1 mm and a thickness of 0.2 mm. The electrical resistivity of the first member 10 and the second member 20 was set to 1.48 × 10⁻¹¹ Ω mm, and the electrical resistivity of the brazed joint 30 was set to 4.83 × 10⁻¹² Ω mm.

[0058] In this state, the combined resistance when the brazed joint 30 thins from the outside due to sulfur corrosion was calculated by multiplying the resistances of the three parts—the first member 10, the second member 20, and the brazed joint 30—in series.

[0059] As shown in Figure 5, the combined resistance of the first member 10, the brazed portion 30, and the second member 20 increases as corrosion of the brazed portion 30 progresses. Specifically, the combined resistance rises sharply just before penetration due to sulfidation corrosion occurs in the brazed portion 30.

[0060] In this way, sulfur corrosion can be detected by monitoring the combined resistance of the first member 10, the brazed portion 30, and the second member 20 in the corrosion sensor.

[0061] [effect] The corrosion sensor 2A, corrosion detection system 1, and corrosion detection method according to Embodiment 1 can achieve the following effects.

[0062] The corrosion sensor 2A according to Embodiment 1 of the present disclosure comprises a first member 10 mainly composed of copper, a second member 20 mainly composed of copper, and a brazed portion 30 formed by brazing the first member 10 and the second member 20 together. The first member 10 and the second member 20 are electrically connected via the brazed portion 30.

[0063] This configuration makes it possible to detect sulfidation corrosion. For example, by placing the corrosion sensor 2A near the object in which sulfidation corrosion is to be detected, sulfidation corrosion can be reproduced in the first member 10, the second member 20, and the brazed portion 30.

[0064] The corrosion sensor 2A includes a power supply 40 connected to the first member 10 and the second member 20 for applying voltage or current, and a measuring unit 50 connected to the first member 10 and the second member 20 for measuring the measurement current and measurement voltage.

[0065] This configuration allows for the detection of sulfur corrosion. Specifically, the combined resistance of the first member 10, the second member 20, and the brazed joint 30 can be calculated based on the measured current and measured voltage. Since there is a correlation between the combined resistance and sulfur corrosion, sulfur corrosion can be detected based on the combined resistance.

[0066] The corrosion sensor 2A has electrical insulating properties and includes a protective layer 60 that covers a portion of the first member 10 and the second member 20.

[0067] This configuration allows for the protection of the first member 10 and the second member 20.

[0068] The first member 10 and the second member 20 are made of oxygen-free copper.

[0069] This configuration allows for the detection of sulfur corrosion.

[0070] The first member 10 and the second member 20 contain phosphorus.

[0071] This configuration allows for the detection of sulfur corrosion.

[0072] The brazed portion 30 contains phosphorus. The phosphorus concentration in the brazed portion 30 is higher than the phosphorus concentration in the first member 10 and the second member 20.

[0073] This configuration makes it possible to create a situation where sulfidation corrosion is more likely to progress at the brazed portion 30 compared to the first member 10 and the second member 20.

[0074] The brazed portion 30 is formed from phosphorus copper solder.

[0075] This configuration makes it possible to create conditions that facilitate the progression of sulfidation corrosion at the brazed joint 30.

[0076] The brazed portion 30 is formed with silver solder.

[0077] This configuration allows for the detection of sulfur corrosion.

[0078] The first member 10 and the second member 20 have an arc-shaped curve, and are arranged so that a part of the first member 10 and a part of the second member 20 overlap.

[0079] This configuration allows for better detection of sulfur corrosion. For example, it can be adapted to the shape of refrigerant piping in the heat exchanger of an air conditioner.

[0080] The first member 10 and the second member 20 are coated with paint to prevent corrosion.

[0081] This configuration allows us to closely replicate the conditions of the object in which we want to detect sulfidation corrosion.

[0082] Power supply 40 applies a constant voltage or constant current.

[0083] This configuration makes it easier to calculate the equivalent resistance.

[0084] The first member 10, the second member 20, and the brazed joint 30 are positioned near the heat exchanger of the refrigeration cycle device.

[0085] This configuration allows for the detection of sulfur corrosion in the same environment as the heat exchanger of a refrigeration cycle system.

[0086] The measuring unit 50 includes a voltmeter 51 and an ammeter 52. The voltmeter 51 is connected to the first member 10 and the second member 20 via a first lead wire 70A connected to a first terminal 71 provided on the first member 10 and a second terminal 72 provided on the second member 20. The ammeter 52 is connected to the first member 10 and the second member 20 via a second lead wire 70B connected to a third terminal 73 provided on the first member 10 and a fourth terminal 74 provided on the second member 20.

[0087] This configuration allows for more accurate detection of sulfur corrosion. Specifically, the voltmeter 51 can accurately measure the voltage between the first member 10 and the second member 20, enabling a more accurate calculation of the combined resistance.

[0088] The corrosion detection system 1 according to Embodiment 1 of the present disclosure comprises a first member 10 mainly composed of copper, a second member 20 mainly composed of copper, a brazed joint 30 formed by brazing the first member 10 and the second member 20 together, a power supply 40 connected to the first member 10 and the second member 20 for applying voltage or current, a measuring unit 50 connected to the first member 10 and the second member 20 for measuring measurement current and measurement voltage, and a control device 3 for controlling the power supply 40 and the measuring unit 50. The first member 10 and the second member 20 are electrically connected via the brazed joint 30. The control device 3 applies voltage or current between the first member 10 and the second member 20 using the power supply 40, and measures the measurement current and measurement voltage between the first member 10 and the second member 20 using the measuring unit 50. Furthermore, the control device 3 calculates the combined resistance of the first member 10, the second member 20, and the brazed joint 30 based on the measured voltage and measured current, and detects sulfidation corrosion based on the combined resistance.

[0089] This configuration allows for the detection of sulfur corrosion.

[0090] The control device 3 determines the degree of sulfidation corrosion based on the combined resistance.

[0091] This configuration allows for the determination of the degree of sulfide corrosion progression.

[0092] The control device 3 predicts penetration due to sulfidation corrosion based on the combined resistance.

[0093] This configuration makes it possible to predict penetration due to sulfidation corrosion.

[0094] The corrosion detection method according to Embodiment 1 of the present disclosure includes steps ST1 to ST5. Step ST1 is to apply a current or voltage to the corrosion sensor 2A. Step ST2 is to measure the measurement voltage between the first member 10 and the second member 20. Step ST3 is to measure the measurement current between the first member 10 and the second member 20. Step ST4 is to calculate the combined resistance of the first member 10, the brazed portion 30 and the second member 20 based on the measurement voltage and measurement current. Step ST5 is to detect sulfide corrosion based on the combined resistance value.

[0095] This configuration allows for the detection of sulfur corrosion.

[0096] In Embodiment 1, an example was described in which the corrosion sensor 2A includes a power supply 40, a measuring unit 50, and a protective layer 60, but it is not limited to this. For example, the corrosion sensor 2A may not include a power supply 40, a measuring unit 50, and / or a protective layer 60.

[0097] In Embodiment 1, an example was described in which the measuring unit 50 includes a voltmeter 51 and an ammeter 52, but it is not limited to this. The measuring unit 50 may include at least one of the voltmeter 51 and the ammeter 52. For example, if the measuring unit 50 does not include a voltmeter 51, the control device 3 may calculate the equivalent resistance using the voltage applied by the power supply 40. Alternatively, if the measuring unit 50 does not include an ammeter 52, the control device 3 may calculate the equivalent resistance using the current applied by the power supply 40.

[0098] In Embodiment 1, the operation of the corrosion detection system 1 was described using steps ST1 to ST5, but it is not limited thereto. The steps included in the operation may be increased, decreased, divided, or combined.

[0099] (Variation 1) A modified example of corrosion detection system 1 will be explained using Figure 6. Figure 6 is a schematic diagram of corrosion detection system 1 of modified example 1.

[0100] As shown in Figure 6, in the corrosion sensor 2B, the measuring unit 50 is connected to the first member 10 and the second member 20 by two terminals 71 and 72. Specifically, the voltmeter 51 and the ammeter 52 are connected to the first member 10 and the second member 20 via first lead wires 70A and 70B, which are connected to the first terminal 71 and the second terminal 72, respectively.

[0101] Even with this configuration, sulfur corrosion can be detected.

[0102] (Embodiment 2) The corrosion detection system of Embodiment 2 relating to this disclosure will be described below.

[0103] Embodiment 2 will primarily describe the differences from Embodiment 1. In Embodiment 2, components identical or equivalent to those in Embodiment 1 will be denoted by the same reference numerals. Furthermore, in Embodiment 2, descriptions that overlap with those in Embodiment 1 will be omitted.

[0104] Figure 7 is a flowchart showing an example of the operation of a corrosion detection system according to Embodiment 2 of this disclosure.

[0105] Embodiment 2 differs from Embodiment 1 in that it detects whether or not there is electrical conductivity between the first member 10 and the second member 20, and detects sulfidation corrosion based on whether or not there is electrical conductivity.

[0106] As shown in Figure 7, in step ST11, the control device 3 controls the power supply 40 and applies a voltage or current between the first member 10 and the second member 20.

[0107] In step ST12, the control device 3 detects whether or not there is continuity between the first member 10 and the second member 20. For example, the measuring unit 50 measures the measurement voltage or measurement current between the first member 10 and the second member 20.

[0108] The measuring unit 50 includes at least one of a voltmeter 51 and an ammeter 52. When measuring voltage, the measuring unit 50 only needs to include a voltmeter 51. When measuring current, the measuring unit 50 only needs to include an ammeter 52.

[0109] For example, the control device 3 detects whether or not there is continuity based on the measured voltage or measured current measured by the measuring unit 50 and a threshold value. The control device 3 detects that the first member 10 and the second member 20 are conducting if the measured voltage or measured current is greater than the threshold value. The control device 3 detects that the first member 10 and the second member 20 are not conducting if the measured voltage or measured current is less than or equal to the threshold value. For example, the threshold value is 0.

[0110] In step ST13, the control device 3 detects sulfide corrosion based on the presence or absence of continuity. The control device 3 does not detect sulfide corrosion if the first member 10 and the second member 20 are electrically connected. The control device 3 detects sulfide corrosion if the first member 10 and the second member 20 are not electrically connected.

[0111] In at least one of the first member 10, the second member 20, and the brazed joint 30, penetration occurs due to sulfidation corrosion, and the first member 10 and the second member 20 are electrically disconnected. The control device 3 detects that the first member 10 and the second member 20 have been electrically disconnected due to penetration caused by sulfidation corrosion.

[0112] [effect] The corrosion detection system 1 and corrosion detection method according to Embodiment 2 can achieve the following effects.

[0113] The corrosion detection system 1 according to Embodiment 2 of the present disclosure comprises a first member 10, a second member 20, a brazing part 30, a power supply 40, a measuring unit 50, and a control device 3. The measuring unit 50 is connected to the first member 10 and the second member 20 and measures a measurement voltage or measurement current. The control device 3 applies a voltage or current between the first member 10 and the second member 20 using the power supply 40 and detects whether or not there is continuity between the first member 10 and the second member 20 based on the measurement current or measurement voltage measured by the measuring unit 50. The control device 3 also detects sulfide corrosion based on the presence or absence of continuity.

[0114] This configuration makes it possible to detect sulfidation corrosion. Specifically, the control device 3 can detect when penetration due to sulfidation corrosion has occurred in at least one of the first member 10, the second member 20, and the brazed portion 30, and when the first member 10 and the second member 20 are electrically disconnected, based on whether or not there is continuity between the first member 10 and the second member 20.

[0115] The corrosion detection method according to Embodiment 2 of the present disclosure includes steps ST11 to ST13. Step ST11 involves applying a current or voltage between the first member 10 and the second member 20. Step ST12 involves detecting whether or not there is continuity between the first member 10 and the second member 20. Step ST13 involves detecting sulfide corrosion based on the presence or absence of continuity.

[0116] Even with this configuration, sulfide corrosion can be detected in the same way as the corrosion detection system 1 described above.

[0117] In Embodiment 2, an example was described in which the control device 3 detects whether or not there is continuity between the first member 10 and the second member 20 based on a measured voltage or measured current measured by a voltmeter 51 or an ammeter 52, but the invention is not limited to this. The measuring unit 50 can be any device that measures information capable of detecting whether or not there is continuity between the first member 10 and the second member 20.

[0118] Embodiment 2 describes an example where the threshold for determining the presence or absence of continuity is 0, but it is not limited to this. The threshold may be set to any value other than 0.

[0119] While this disclosure is adequately described in relation to preferred embodiments with reference to the accompanying drawings, various modifications and alterations will be obvious to those skilled in the art. Such modifications and alterations should be understood to be included within the scope of the invention as defined by the appended claims.

[0120] (Other embodiments) (Note) Based on the above description of embodiments, the following technologies are disclosed.

[0121] (Technology 1) A corrosion sensor for detecting sulfur corrosion, comprising a first member mainly composed of copper, a second member mainly composed of copper, and a brazed joint formed by brazing the first member and the second member, wherein the first member and the second member are electrically connected via the brazed joint.

[0122] (Technology 2) The corrosion sensor according to Technology 1, further comprising: a power supply connected to the first member and the second member for applying voltage or current; and a measuring unit connected to the first member and the second member for measuring at least one of a measuring current and a measuring voltage.

[0123] (Technology 3) The corrosion sensor according to Technology 1 or 2, further comprising a protective layer having electrical insulation properties and covering a portion of the first member and the second member.

[0124] (Technology 4) The corrosion sensor according to any one of Technologies 1 to 3, wherein the first member and the second member are made of oxygen-free copper.

[0125] (Technical 5) The corrosion sensor according to any one of Technical 1 to 4, wherein the first member and the second member contain phosphorus.

[0126] (Technical 6) The corrosion sensor according to Technical 5, wherein the brazed portion contains phosphorus, and the phosphorus concentration of the brazed portion is higher than the phosphorus concentration of the first member and the second member.

[0127] (Technical 7) The brazed portion is formed of phosphorus copper solder, as described in any one of Technical 1 to 6.

[0128] (Technology 8) The brazed portion is formed of silver solder, the corrosion sensor according to any one of Techniques 1 to 6.

[0129] (Technical 9) The corrosion sensor according to any one of Technical 1 to 8, wherein the first member and the second member have an arc-shaped curved form, and are arranged such that a part of the first member and a part of the second member overlap.

[0130] (Technical 10) The corrosion sensor according to any one of Technical 1 to 9, wherein the first member and the second member are coated with a paint for corrosion prevention.

[0131] (Technical 11) The power supply is a corrosion sensor according to Technical 2, to which a constant voltage or constant current is applied.

[0132] (Technology 12) A corrosion sensor according to any one of Technologies 1 to 11, wherein the first member, the second member, and the brazed portion are arranged near a heat exchanger in a refrigeration cycle device.

[0133] (Technical 13) The corrosion sensor according to Technical 2 or 11, wherein the measuring unit includes a voltmeter and an ammeter connected to the first member and the second member via lead wires connected to a first terminal provided on the first member and a second terminal provided on the second member.

[0134] (Technical 14) The corrosion sensor according to Technical 2 or 11, wherein the measuring unit includes a voltmeter connected to the first member and the second member via a first lead wire connected to a first terminal provided on the first member and a second terminal provided on the second member, and an ammeter connected to the first member and the second member via a second lead wire connected to a third terminal provided on the first member and a fourth terminal provided on the second member.

[0135] (Technical 15) A corrosion detection system for detecting sulfidation corrosion, comprising: a first member mainly composed of copper; a second member mainly composed of copper; a brazed joint formed by brazing the first member and the second member; a power supply connected to the first member and the second member for applying voltage or current; a measuring unit connected to the first member and the second member for measuring a measurement current and a measurement voltage; and a control device for controlling the power supply and the measuring unit, wherein the first member and the second member are electrically connected via the brazed joint; the control device applies the voltage or current between the first member and the second member using the power supply, measures the measurement current and the measurement voltage between the first member and the second member using the measuring unit, calculates the combined resistance of the first member, the second member and the brazed joint based on the measurement voltage and the measurement current, and detects sulfidation corrosion based on the combined resistance.

[0136] (Technical 16) The corrosion detection system according to Technical 15, wherein the control device determines the degree of progression of sulfide corrosion based on the combined resistance.

[0137] (Technical 17) The corrosion detection system according to Technical 15 or 16, wherein the control device predicts penetration due to sulfidation corrosion based on the combined resistance.

[0138] (Technical 18) A corrosion detection system for detecting sulfide corrosion, comprising: a first member mainly composed of copper; a second member mainly composed of copper; a brazed joint formed by brazing the first member and the second member; a power supply connected to the first member and the second member for applying voltage or current; a measuring unit connected to the first member and the second member for measuring a measurement current or a measurement voltage; and a control device for controlling the power supply and the measuring unit, wherein the control device applies the voltage or current between the first member and the second member using the power supply, detects the presence or absence of continuity between the first member and the second member based on the measurement current or measurement voltage measured by the measuring unit, and detects sulfide corrosion based on the presence or absence of continuity.

[0139] (Technical 19) A corrosion detection method for detecting sulfidation corrosion, comprising: a first member mainly composed of copper; a second member mainly composed of copper; and a brazed joint formed by brazing the first member and the second member, wherein the first member and the second member are electrically connected via the brazed joint; a corrosion detection method comprising: applying a current or voltage to a corrosion sensor; measuring a measurement voltage between the first member and the second member; measuring a measurement current between the first member and the second member; calculating the combined resistance of the first member, the brazed joint and the second member based on the measurement voltage and the measurement current; and detecting sulfidation corrosion based on the combined resistance.

[0140] (Technical 20) A corrosion detection method for detecting sulfidation corrosion, comprising the steps of: applying a current or voltage to a corrosion sensor comprising a first member mainly composed of copper, a second member mainly composed of copper, and a brazed portion formed by brazing the first member and the second member together; detecting whether or not there is conductivity between the first member and the second member; and detecting sulfidation corrosion based on the presence or absence of conductivity.

[0141] (Technical 21) A program that causes a processor to execute the corrosion detection method described in Technical 19 or 20.

[0142] (Technical 22) A non-temporary computer-readable storage medium in which a computer program is stored, wherein the corrosion detection method described in Technical 19 or 20 is realized when the computer program is executed by a processor. [Industrial applicability]

[0143] According to this disclosure, sulfidation corrosion can be detected. [Explanation of Symbols]

[0144] 1. Corrosion detection system 2A, 2B Corrosion Sensor 3. Control device 10 First Member 20 Second Member 30 Brazed section 40 Power supply 50 Measuring part 51 Voltmeter 52 Ammeter 60 protective layer 70A, 70B lead wires Terminals 71-74

Claims

1. A corrosion sensor for detecting sulfide corrosion, A first component mainly composed of copper, A second component mainly composed of copper, A brazed joint formed by brazing the first member and the second member, Equipped with, The first member and the second member are electrically connected via the brazed portion. Corrosion sensor.

2. A power supply connected to the first member and the second member, to which voltage or current is applied, A measuring unit connected to the first member and the second member, which measures at least one of the measuring current and the measuring voltage, Furthermore, The corrosion sensor according to claim 1.

3. The system further comprises a protective layer that has electrical insulating properties and covers a portion of the first member and the second member. The corrosion sensor according to claim 1.

4. The first member and the second member are made of oxygen-free copper. The corrosion sensor according to claim 1.

5. The first member and the second member contain phosphorus, The corrosion sensor according to claim 1.

6. The brazed portion contains phosphorus, The phosphorus concentration in the brazed portion is higher than that of the first and second members. The corrosion sensor according to claim 5.

7. The brazed portion is formed of phosphorus copper solder. The corrosion sensor according to claim 1.

8. The aforementioned brazed portion is formed of silver solder. The corrosion sensor according to claim 1.

9. The first member and the second member have an arc-shaped curve, The first member and the second member are arranged so as to overlap. The corrosion sensor according to claim 1.

10. The first and second members are coated with a paint to prevent corrosion. The corrosion sensor according to claim 1.

11. The aforementioned power supply applies a constant voltage or a constant current. The corrosion sensor according to claim 2.

12. The first member, the second member, and the brazed portion are arranged near the heat exchanger of the refrigeration cycle device. The corrosion sensor according to claim 1.

13. The measuring unit includes a voltmeter and an ammeter connected to the first member and the second member via lead wires connected to a first terminal provided on the first member and a second terminal provided on the second member. The corrosion sensor according to claim 2.

14. The aforementioned measuring unit is A voltmeter is connected to the first member and the second member via a first lead wire connected to a first terminal provided on the first member and a second terminal provided on the second member, An ammeter is connected to the first member and the second member via a second lead wire connected to a third terminal provided on the first member and a fourth terminal provided on the second member, including, The corrosion sensor according to claim 2.

15. A corrosion detection system for detecting sulfide corrosion, A first component mainly composed of copper, A second component mainly composed of copper, A brazed joint formed by brazing the first member and the second member, A power supply connected to the first member and the second member, to which voltage or current is applied, A measuring unit connected to the first member and the second member for measuring current and voltage, A control device that controls the power supply and the measuring unit, Equipped with, The first member and the second member are electrically connected via the brazed portion. The control device is The voltage or current is applied between the first member and the second member by the power supply. The measuring unit measures the measurement current and the measurement voltage between the first member and the second member. Based on the measured voltage and the measured current, the combined resistance of the first member, the second member, and the brazed joint is calculated. Based on the aforementioned combined resistance, the sulfur corrosion is detected. Corrosion detection system.

16. The control device determines the degree of progression of the sulfur corrosion based on the combined resistance. The corrosion detection system according to claim 15.

17. The control device predicts penetration due to sulfidation corrosion based on the combined resistance. The corrosion detection system according to claim 15.

18. A corrosion detection system for detecting sulfide corrosion, A first component mainly composed of copper, A second component mainly composed of copper, A brazed joint formed by brazing the first member and the second member, A power supply connected to the first member and the second member, to which voltage or current is applied, A measuring unit connected to the first member and the second member for measuring current or voltage, A control device that controls the power supply and the measuring unit, Equipped with, The control device is The voltage or current is applied between the first member and the second member by the power supply. Based on the measured current or measured voltage measured by the measuring unit, the presence or absence of continuity between the first member and the second member is detected. Based on the presence or absence of the aforementioned conductivity, the sulfur corrosion is detected. Corrosion detection system.

19. A corrosion detection method for detecting sulfide corrosion, A corrosion sensor comprising a first member mainly composed of copper, a second member mainly composed of copper, and a brazed joint formed by brazing the first member and the second member, wherein the first member and the second member are electrically connected via the brazed joint, is provided with a current or voltage. A step of measuring the measurement voltage between the first member and the second member, A step of measuring the measurement current between the first member and the second member, A step of calculating the combined resistance of the first member, the brazed portion, and the second member based on the measured voltage and the measured current, A step of detecting sulfur corrosion based on the aforementioned composite resistance, including, Corrosion detection method.

20. A corrosion detection method for detecting sulfide corrosion, A corrosion sensor comprising a first member mainly composed of copper, a second member mainly composed of copper, and a brazed portion formed by brazing the first member and the second member together, is subjected to the steps of applying current or voltage to the sensor. A step of detecting whether or not there is electrical conductivity between the first member and the second member, A step of detecting sulfur corrosion based on the presence or absence of the aforementioned conductivity, including, Corrosion detection method.

21. A program that causes a processor to execute the corrosion detection method described in claim 19 or 20.

22. A non-temporary, computer-readable storage medium on which computer programs are stored, When the computer program is executed by the processor, the corrosion detection method described in claim 19 or 20 is realized. A non-temporary, computer-readable storage medium.

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