Spray corrosion tester, combined cycle tester, and method for improving the spray corrosion tester

Abstract

To provide a spray corrosion testing machine in which a flow rate sensor hardly fails, a composite cycle testing machine, and an improvement method for the spray corrosion testing machine.SOLUTION: A spray corrosion testing machine includes a test tank, a spray part, a first air supply part, and a corrosive liquid supply part. The spray part includes; a first nozzle 33 supplied with a corrosive liquid and provided with a first opening; and a second nozzle 32 adjacent to the first opening and provided with a second opening. The first air supply part supplies spray formation air to the second nozzle 32. The corrosive liquid supply part includes: a solution reservoir 51 for retaining a corrosive liquid; a pipe 52 for connecting the solution reservoir 51 and the first nozzle 33; and a flow rate sensor 55 formed in the pipe 52 to measure a flow rate of the corrosive liquid supplied from the solution reservoir 51 to the first nozzle. Further, in the spray corrosion testing machine, the flow rate sensor 55 is disposed outside of the test tank or inside the test tank, and in the case of being disposed inside the test tank, the flow rate sensor 55 is covered with a shield vessel for preventing exposure to spraying.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The disclosure in this application relates to a spray corrosion tester, a cyclical tester, and a method for improving a spray corrosion tester. [Background technology]

[0002] There are known spray corrosion testers that perform spray corrosion tests on samples such as equipment parts and materials. Also known is a combined cycle tester that combines a spray corrosion test with other tests, such as a dry test, a wet test, an immersion test, and a low-temperature test, to form one cycle and expose test specimens to the cycle repeatedly (Patent Document 1).

[0003] The spray corrosion testing machine described in Patent Document 1 is equipped with a sprayer having an air nozzle and a liquid nozzle inside a test tank, and is configured so that the corrosive liquid (corrosive solution such as salt water) inside the liquid nozzle is sucked up by the Venturi effect of the compressed air sprayed from the air nozzle and is sprayed uniformly as fine particles onto the test piece placed inside the test tank.

[0004] However, when spraying the corrosive liquid using the Venturi effect, the nozzle holes of the liquid nozzle may become clogged due to the adhesion of deposits. For this reason, Patent Document 1 describes a method for measuring the flow rate of the corrosive liquid using a flow sensor, and when the flow rate of the corrosive liquid supplied to the liquid nozzle falls below a specified value, a control unit stops spraying the corrosive liquid and cleans the liquid nozzle. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5810377 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the present inventors have discovered a new problem with the invention described in Patent Document 1, in that the flow sensor is disposed inside the test tank, and therefore there is a risk that the flow sensor may break down due to spraying of the corrosive liquid.

[0007] The disclosure of this application has been made to solve the above-mentioned problems. As a result of intensive research, it has been newly discovered that the above-mentioned problems can be solved by placing the flow sensor outside the test tank or inside the test tank, and if the flow sensor is placed inside the test tank, covering the flow sensor with a shielding container to prevent it from being exposed to spray.

[0008] That is, an object of the disclosure in this application is to provide a spray corrosion tester, a combined cycle tester, and an improved method for a spray corrosion tester in which the flow rate sensor is less likely to fail. [Means for solving the problem]

[0009] The disclosure in this application relates to a spray corrosion tester, a combined cycle tester, and a method for improving the spray corrosion tester, which are described below.

[0010] (1) A spray corrosion tester including a test tank, a spray unit, a first air supply unit, and a corrosive liquid supply unit, The spray section is a first nozzle having a first tip portion provided with a first opening and through which an etching liquid is supplied; a second nozzle having a second tip portion provided with a second opening adjacent to the first opening; a spray tower having an interior space that accommodates the first tip and the second tip; Including, The corrosive solution can be sprayed into the test chamber, the first air supply unit supplies spray forming air to the second nozzle; The etchant supply unit is a solution reservoir for holding an etching solution; a pipe connecting the solution reservoir and the first nozzle; a flow rate sensor formed in the pipe for measuring the flow rate of the corrosive solution supplied from the solution reservoir to the first nozzle; Including, The flow sensor is It is placed outside the test chamber or inside the test chamber, When placed in the test chamber, the flow sensor is covered with a shielding container to prevent exposure to spray. Spray corrosion tester. (2) A protrusion protruding toward the inside of the test chamber is formed on a part of the side wall of the test chamber, The flow sensor is located on the outer part of the test chamber at the convex part. The spray corrosion tester according to (1) above. (3) A convex portion protruding toward the inside of the test tank is formed on a part of the bottom floor of the test tank. The flow sensor is located on the outer part of the test chamber at the convex part. The spray corrosion tester according to (1) above. (4) When the flow sensor is placed in the test tank, a temperature control unit is included to adjust the temperature inside the shielded container. The spray corrosion tester according to (1) above. (5) The temperature control unit a second air supply for supplying cooling air to the shielding vessel; or a cooling water supply unit for supplying cooling water to the shielding vessel; Contains The spray corrosion tester according to (4) above. (6) further comprising a control unit; The control unit outputs an alarm signal when the measurement value of the flow sensor deviates from a preset value. The spray corrosion tester according to any one of the above (1) to (5). (7) further comprising a control unit; the first air supply unit includes a pressure regulator that controls the supply pressure of the spray-forming air; The control unit controls the pressure regulator to adjust the amount of spray supplied to the test tank to a predetermined value when the measurement value of the flow rate sensor deviates from a preset value. The spray corrosion tester according to any one of the above (1) to (5). (8) The first air supply unit further includes an air saturator that adjusts the temperature of the air supplied from the second nozzle; The control unit controls the air saturator to adjust the temperature of the air supplied from the second nozzle to a predetermined temperature when the measurement value of the flow rate sensor deviates from a preset value. The spray corrosion tester according to (7) above. (9) A combined cycle testing machine comprising the spray corrosion testing machine according to any one of (1) to (5) above, and configured to sequentially perform a spray corrosion test and one or more other tests. (10) A method for improving a spray corrosion tester, comprising: The spray corrosion tester includes a test tank, a spray unit, a first air supply unit, and a corrosive liquid supply unit, The spray section is a first nozzle having a first tip portion provided with a first opening and through which an etching liquid is supplied; a second nozzle having a second tip portion provided with a second opening adjacent to the first opening; a spray tower having an interior space that accommodates the first tip and the second tip; Including, The corrosive solution can be sprayed into the test chamber, the first air supply unit supplies spray forming air to the second nozzle; The etchant supply unit is a solution reservoir for holding an etching solution; a pipe connecting the solution reservoir and the first nozzle; a flow rate sensor formed in the pipe for measuring the flow rate of the corrosive solution supplied from the solution reservoir to the first nozzle; Including, The improvement method is Removing a portion of the side wall or at least a portion of the bottom floor of the test chamber; placing a second side wall including a convex portion or a second bottom floor having a convex portion on the removed side wall or bottom floor portion; Including, In the placing step, the protrusion is placed so as to protrude toward the inside of the test chamber, so that the flow sensor is placed on the protrusion which is outside the test chamber. Improvement method. [Effects of the Invention]

[0011] By using the spray corrosion tester and cyclic combined tester disclosed in the present application, the flow rate sensor is less likely to break down, which reduces the rate at which tests are interrupted. In addition, the improved method disclosed in the present application allows the flow rate sensor of a conventional spray corrosion tester and cyclic combined tester to be located outside the test tank, which reduces the risk of the flow rate sensor breaking down. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic diagram showing an outline of a spray corrosion tester 1 according to an embodiment. [Figure 2] FIG. 2 is a diagram for explaining an arrangement example 1 of the flow rate sensor 55. In FIG. [Figure 3] FIG. 3 is a diagram for explaining an arrangement example 2 of the flow rate sensor 55. In FIG. [Figure 4] FIG. 4 is a diagram for explaining an arrangement example 3 of the flow rate sensor 55. In FIG. [Figure 5] FIG. 5 is a diagram for explaining an arrangement example 4 of the flow rate sensor 55. In FIG. [Figure 6] FIG. 6 is a diagram for explaining a fourth arrangement example of the flow sensor 55 (an example including a temperature adjustment unit 57). [Figure 7] FIG. 7 is a diagram for explaining a fourth arrangement example of the flow rate sensor 55 (another example of the temperature adjusting unit 57). [Figure 8] FIG. 8 is a schematic diagram showing an outline of a combined cycle testing machine 11 according to an embodiment. [Figure 9] Figure 9A is a schematic diagram showing another example of the arrangement of the first nozzle 33 and the second nozzle 32, and Figure 9B is a schematic diagram showing the positional relationship between the first opening 33a of the first nozzle 33 and the second opening 32a of the second nozzle 32 when Figure 9A is viewed in the Z direction. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, with reference to the drawings, embodiments of a spray corrosion tester, a combined cycle tester, and an improvement method for a spray corrosion tester will be described in detail. Note that in this specification, components having similar functions are assigned the same or similar reference numerals. Furthermore, repeated descriptions of components assigned the same or similar reference numerals may be omitted.

[0014] Furthermore, for ease of understanding, the position, size, range, etc. of each component shown in the drawings may not represent the actual position, size, range, etc. Therefore, the disclosure in this application is not necessarily limited to the position, size, range, etc. disclosed in the drawings.

[0015] (Embodiment of spray corrosion tester 1) An outline of a spray corrosion tester 1 according to an embodiment will be described with reference to Figs. 1 to 7. Fig. 1 is a schematic diagram showing an outline of the spray corrosion tester 1 according to an embodiment. Figs. 2 to 7 are diagrams for explaining the outline of the arrangement of a flow sensor 55, etc. Note that, since Fig. 1 is a diagram showing the overall outline of the spray corrosion tester 1, details such as the arrangement of the flow sensor 55, which is a feature of the disclosure of the present application, are not shown in order to avoid complicating the drawing. The arrangement of the flow sensor 55, etc. will be described in detail with reference to Figs. 2 to 7.

[0016] The spray corrosion tester 1 according to the embodiment includes a test tank 2, a spray unit 3, a first air supply unit 4, and a corrosive liquid supply unit 5.

[0017] The spray corrosion tester 1 sprays a corrosive solution onto a test piece S placed inside a test tank 2, and performs a spray corrosion test to evaluate the corrosion resistance of the test piece. There are no particular restrictions on the corrosive solution, as long as it is a corrosive solution commonly used in the relevant technical field. Examples include a neutral salt solution containing sodium chloride, an acetic acid salt solution obtained by adding acetic acid to a sodium chloride solution, and a CASS solution containing sodium chloride, cupric chloride, and acetic acid (for example, when using salt water as the corrosive solution, see JIS Z 2371 "Salt Spray Test Method").

[0018] The test tank 2 is a container that houses the test piece S and the spray unit 3, and has a space that allows the corrosive liquid sprayed by the spray unit 3 to fall freely onto the test piece S. The ceiling portion of the test tank 2 may be, but is not limited to, a gable roof shape to prevent the sprayed corrosive liquid that adheres to the ceiling portion from falling onto the test piece S.

[0019] The spray unit 3 includes a spray tower 31 erected inside the test tank 2 and a sprayer 35 installed inside the spray tower 31. In the example shown in FIG. 1, the spray tower 31 includes a tubular portion 31A extending in a substantially vertical direction and a direction body 31B arranged above the tubular portion 31A. The tubular portion 31A is, for example, a cylinder, and several air circulation holes (not shown) may be provided at the bottom of the tubular portion 31A. The sprayer 35 is inserted into the internal space of the tubular portion 31A from its side. In the example shown in FIG. 1, the tubular portion 31A is arranged near the side wall of the test tank 2, but the tubular portion 31A may also be arranged near the center of the test tank 2.

[0020] The sprayer 35 includes a first nozzle (liquid nozzle) 33 having a first tip with a first opening and through which the corrosive liquid is supplied, and a second nozzle (air nozzle) 32 having a second tip with a second opening adjacent to the first opening. In the example shown in FIG. 1 , the second nozzle 32 is formed in a substantially L-shape and is fixed to the cylindrical portion 31A so that the tip of the first nozzle 33 and the tip of the second nozzle 32 are adjacent to each other on the same plane. The second nozzle 32 and the first nozzle 33 extend in directions perpendicular to each other within the cylindrical portion 31A, and the nozzle holes (openings) at their respective tips are arranged adjacent to each other. In this embodiment, the first nozzle 33 has a tip extending horizontally, and the second nozzle 32 has a tip extending vertically. The first nozzle 33 and the second nozzle 32 are generally formed of glass. The direction body 31B is used to adjust the spray direction and spray distance of the atomized corrosive solution sprayed by the second nozzle 32 and the first nozzle 33, and is generally conical in shape.

[0021] There are no particular limitations on the first air supply unit 4 as long as it can supply spray-forming air to the second nozzle 32 and form a spray by sucking up the corrosive liquid from the first opening of the first nozzle 33 by the Venturi effect. The first air supply unit 4 includes, for example, a compressor 41, a pressure regulator 42, an air saturator 43, an air supply pipe 46, and a conduit 49.

[0022] The operation of the first air supply unit 4 will now be described. The compressor 41 generates compressed air and sends it to the air saturator 43 via a conduit 49. The pressure regulator 42 controls the pressure of the compressed air generated by the compressor 41. The air saturator 43 converts the compressed air generated by the compressor 41, whose pressure has been adjusted by the pressure regulator 42, into saturated air (compressed air in a saturated state), and contains a predetermined amount of water (deionized water, distilled water, or other water from which impurities have been removed). The foaming pipe 44 is a pipe made of metal, resin, or the like, and is disposed in the water inside the air saturator 43. One end of the foaming pipe 44 is connected to the conduit 49. The foaming pipe 44 foams the compressed air into the water inside the air saturator 43 through multiple pores provided in part of the pipe, thereby generating saturated air. The heater 45 is disposed in the water inside the air saturator 43 and heats the water. The air supply pipe 46 is a pipe that sends saturated air generated in the air saturator 43 to the second nozzle 32 of the spraying unit 3. One end of the air supply pipe 46 is connected to the other end (rear end) of the second nozzle 32, and the other end of the air supply pipe 46 is located in the space above the liquid surface of the water contained inside the air saturator 43.

[0023] The first air supply unit 4 may further include a temperature sensor and a pressure sensor (not shown) in the air saturator 43. The temperature sensor and the pressure sensor measure the temperature and pressure, respectively, in the air saturator 43. Examples of the temperature sensor include a thermocouple thermometer and a platinum resistance thermometer, and examples of the pressure sensor include a strain gauge type pressure gauge and a capacitance type pressure gauge.

[0024] There are no particular limitations on the corrosive liquid supply unit 5 as long as it can supply the corrosive liquid to the first nozzle 33 and form a spray by the Venturi effect of the spray-forming air ejected from the second nozzle 32. The corrosive liquid supply unit 5 of the spray corrosion tester 1 according to the embodiment includes at least a solution reservoir 51 that holds the corrosive liquid, a pipe 52 that connects the solution reservoir 51 and the first nozzle 33, and a flow rate sensor 55 that is formed in the pipe 52 and measures the flow rate of the corrosive liquid supplied from the solution reservoir 51 to the first nozzle 33.

[0025] There are no particular limitations on the flow rate sensor 55 as long as it can measure the flow rate of the corrosive liquid flowing through the pipe 52 from the solution reservoir 51 toward the first nozzle 33. The flow rate sensor 55 may be any of a non-contact type such as an ultrasonic type or an electromagnetic type, or a contact type that comes into contact with the corrosive liquid in the pipe 52. Any known flow rate sensor may be used as the non-contact or contact type flow rate sensor 55. If the flow rate sensor 55 is a non-contact type, it may be attached to the pipe 52. If the flow rate sensor 55 is a contact type, the pipe 52 may be divided and the contact type flow rate sensor 55 may be connected using a flange or the like.

[0026] As described above, the spray is formed by the Venturi effect. If the supply rate of spray-forming air ejected from the second nozzle 32 changes due to an abnormality in the second nozzle 32 or an abnormality in the compressor 41, the amount of corrosive liquid drawn up from the first nozzle 33 also changes. Even if the supply rate of spray-forming air ejected from the second nozzle 32 remains constant, the amount of corrosive liquid drawn up from the first nozzle 33 also changes if the first nozzle 33 becomes clogged with deposits or other materials. Therefore, by measuring the flow rate of the corrosive liquid flowing through the pipe 52, any abnormalities in the spray unit 3, first air supply unit 4, or corrosive liquid supply unit 5 that occur during continuous operation of the spray corrosion tester 1 can be detected. Then, by detecting the abnormality and correcting the abnormal condition, the test can be continued without wasting the test time or test specimens.

[0027] 1 also optionally includes a supply tank 53 for storing replenishment corrosion liquid and a conduit 54. In the example shown in FIG. 1, the solution reservoir 51 is disposed directly below the spray tower 31 and is connected to the first nozzle 33 by a pipe 52. This allows the corrosion liquid held in the solution reservoir 51 to be supplied to the spray tower 31 via the first nozzle 33. The solution reservoir 51 is also connected to the supply tank 53 through the conduit 54. Therefore, if the corrosion liquid is supplied from the supply tank 53 before the corrosion liquid is consumed in the solution reservoir 51, the solution reservoir 51 can be maintained in a state where it always holds the corrosion liquid, enabling continuous operation of the spray corrosion tester 1. Furthermore, the lower part of the cylindrical portion 31A of the spray tower 31 may be configured to be connected to the upper part of the solution reservoir 51. Among the mist of corrosive liquid sprayed from the first nozzle 33, corrosive liquid with small particle diameters is sprayed into the test tank 2 through the gap between the cylindrical portion 31A and the direction body 31B, but corrosive liquid with large particle diameters adheres to the inner wall of the cylindrical portion 31A of the spray tower 31 and flows down the inner wall as droplets. Therefore, only the corrosive liquid with large particle diameters that has adhered to the inner wall of the cylindrical portion 31A can be collected in the solution reservoir 51.

[0028] The spray corrosion tester 1 shown in FIG. 1 optionally includes a control unit 8 and a humidity generator 9. The control unit 8 utilizes a computer having a central processing unit (CPU) and memory. The control unit 8 controls the execution of the spray corrosion test by the CPU operating in accordance with a predetermined program stored in the memory and based on various data, such as the spray time of the corrosive solution and the temperature of the test chamber 2 and the corrosive solution. The control unit 8 controls, for example, the on / off operation of the heater 45. The control unit 8 may also control the saturated air using the compressor 41 and pressure regulator 42 as needed. The control unit 8 may also receive signals from a temperature sensor and a pressure sensor (neither shown) installed inside the air saturator 43. In this case, the control unit 8 transmits control signals to the heater 45 and the pressure regulator 42 to adjust the temperature and pressure of the saturated air in response to the signals from the temperature sensor and the pressure sensor. The control unit 8 may also receive signals from a flow rate sensor 55. Control when the control unit 8 receives a signal from the flow rate sensor 55 will be described later.

[0029] The humidity generating unit 9 is located below the test chamber 2 and generates steam to supply into the test chamber 2. The humidity generating unit 9 can maintain a high humidity level inside the test chamber 2 while controlling the temperature inside the test chamber 2 to a predetermined value.

[0030] (Example of arrangement of flow rate sensor 55 that can be used in spray corrosion tester 1 according to the embodiment) The flow rate sensor 55 of the spray corrosion tester 1 according to the embodiment is placed outside the test tank 2 or inside the test tank 2. When placed inside the test tank 2, the flow rate sensor 55 is covered with a shielding container 56 to prevent exposure to the spray. Below, with reference to the drawings, examples of placement of the flow rate sensor 55 that can be used in the spray corrosion tester 1 according to the embodiment will be described. Note that the placement examples shown below are merely examples. It goes without saying that the placement of the flow rate sensor 55 is not limited to the examples below, as long as it can be placed so as not to be exposed to the spray.

[0031] (Flow sensor 55 placement example 1) An arrangement example 1 of the flow rate sensor 55 will be described with reference to Fig. 2. Note that Fig. 2 shows only a part of the spray corrosion tester 1 in order to mainly explain the arrangement of the flow rate sensor 55. As in Fig. 2, Figs. 3 to 7 also show only a part of the spray corrosion tester 1.

[0032] First, referring to FIG. 2, an example in which the flow sensor 55 is disposed outside the test tank 2 will be described. In the example shown in FIG. 2, the flow sensor 55 is disposed outside the side wall 2a of the test tank 2. When the test tank 2 is viewed vertically from above (Z direction in FIG. 2), the test tank 2 has a substantially rectangular or square shape. In other words, there are four side walls. In the example shown in FIG. 2, the flow sensor 55 and a portion of the pipe 52 are disposed so as to protrude from any one of the side walls 2a to the outside of the test tank 2. In the example shown in FIG. 2, a through hole through which the pipe 52 passes is formed in the side wall 2a, and the connection between the through hole and the pipe 52 may be sealed using putty, a through-type joint, a rubber stopper, or the like.

[0033] Although not shown, the flow rate sensor 55 may be disposed outside the test tank 2 from the bottom floor 2b of the test tank 2. In the example shown in FIG. 2, one end of a roughly U-shaped pipe 52 is connected to the solution reservoir 51 in a roughly horizontal direction. When disposing the flow rate sensor 55 outside the test tank 2 from the bottom floor 2b, the pipe 52 is extended vertically from the solution reservoir 51 from the bottom floor 2b to the outside of the test tank 2, and the pipe 52 after attaching the flow rate sensor 55 is returned into the test tank 2 and connected to the first nozzle 33.

[0034] The spray corrosion tester 1 in which the flow rate sensor 55 is arranged as described in Arrangement Example 1 has the following effects. (1) The corrosive liquid used in the spray corrosion tester 1 is a corrosive liquid such as salt water, and the flow sensor 55 in Arrangement Example 1 is arranged outside the test tank 2. Therefore, the flow sensor 55 is not exposed to the spray, and therefore the risk of the flow sensor 55 failing due to corrosion is reduced compared to the flow sensor 55 described in Patent Document 1. (2) Even if the flow rate sensor 55 breaks down, the flow rate sensor 55 is disposed outside the test chamber 2. Therefore, the flow rate sensor 55 can be replaced without opening the test chamber 2 during continuous operation. (3) Components of the spray corrosion tester 1 may be located below the test tank 2. Therefore, when the flow rate sensor 55 is located on the outside of the side wall 2a, the convenience of arranging and replacing the flow rate sensor 55 is improved compared to when the flow rate sensor 55 is located on the outside of the bottom floor 2b. (4) A display unit that displays the flow rate may be integrally configured with the flow rate sensor 55. When the flow rate sensor 55 is disposed on the outside of the side wall 2a, an operator can easily monitor the display unit of the flow rate sensor 55. (5) The wiring work from the power line and signal line of the flow rate sensor 55 to the control unit 8 is made easier.

[0035] (Flow sensor 55 placement example 2) Next, with reference to Figure 3, another example in which the flow sensor 55 is arranged outside the test tank 2 will be described. In the example shown in Figure 3, a protrusion 2c that protrudes toward the inside of the test tank 2 is formed on part of the side wall 2a of the test tank 2, and the flow sensor 55 is arranged on the protrusion 2c outside the test tank 2. The example shown in Figure 3 has the same configuration as Arrangement Example 1, except that the flow sensor 55 is arranged on the protrusion 2c formed on the side wall 2a.

[0036] (Flow sensor 55 placement example 3) Next, with reference to Figure 4, another example in which the flow sensor 55 is arranged outside the test tank 2 will be described. In the example shown in Figure 4, a convex portion 2d that protrudes toward the inside of the test tank 2 is formed on part of the bottom floor 2b of the test tank 2, and the flow sensor 55 is arranged on the outer part of the convex portion 2d on the test tank 2. The example shown in Figure 4 has the same configuration as Arrangement Example 2, except that the convex portion 2d is formed on the bottom floor 2b.

[0037] The spray corrosion tester 1 in which the flow rate sensor 55 is arranged as described in Arrangement Example 2 or 3 has the following effects in addition to the effects achieved by Arrangement Example 1. (6) The spray test may be performed at a temperature higher than room temperature. In this case, in the example shown in Arrangement Example 1, the flow sensor 55 and a portion of the pipe 52 are directly exposed to the external environment where the spray corrosion tester 1 is installed. Therefore, in the case of Arrangement Example 1, if the temperature difference between the inside of the test tank 2 and the external environment is large, the corrosive liquid flowing through the pipe 52 located outside the test tank 2 may be affected by the temperature. On the other hand, in Arrangements Examples 2 and 3, the periphery of the convex portions 2c and 2d is covered with the test tank 2 except for a portion, so the temperature inside the convex portions 2c and 2d (outside the test tank 2) is closer to the temperature inside the test tank 2 than the external environment. In other words, the temperature inside the convex portions 2c and 2d (outside the test tank 2) is lower than the temperature inside the test tank 2 but higher than the temperature of the external environment. Therefore, in the examples shown in Arrangement Examples 2 and 3, the corrosive liquid flowing through the pipe 52 is less likely to be affected by the temperature of the external environment compared to Arrangement Example 1. (7) Assume that the spray corrosion tester 1 is used in a combined cycle test. In the combined cycle test, the temperature inside the test tank 2 may be heated to, for example, about 70°C. The flow sensor 55 is at a higher risk of failure when exposed to a high-temperature environment. On the other hand, as described in (5) above, the temperature inside the protrusions 2c and 2d (outside the test tank 2) is lower than the temperature inside the test tank 2, but higher than the temperature of the external environment. Therefore, compared to when the flow sensor 55 is placed inside the test tank 2, the risk of failure of the flow sensor 55 due to heat is reduced. (8) To generate the desired amount of spray using the Venturi effect, it is necessary to carefully design each parameter, taking into consideration the size of the openings of the first nozzle 33 and the second nozzle 32, the length and shape of the pipe 52, the relative position of the solution reservoir 51 and the first nozzle 33, the flow rate of the spray-forming air ejected from the second nozzle 32, and so on. Of course, in the case of Arrangement Example 1, it is conceivable that the design may differ from that of the conventional spray corrosion tester 1, but this can be achieved by carefully designing the parameters of Arrangement Example 1. On the other hand, in the examples shown in Arrangement Examples 2 and 3, the flow sensor 55 can be placed outside the test tank 2 without changing the design of the conventional spray unit 3, first air supply unit 4, corrosive solution supply unit 5, and pipe 52. Therefore, the configuration of the conventional spray corrosion tester 1 can be used as is, except for the convex portions 2c and 2d.

[0038] (Flow sensor 55 placement example 4) Next, with reference to FIGS. 5 to 7, a case where the flow sensor 55 is placed inside the test tank 2 will be described. In the example shown in FIG. 5, the flow sensor 55 is covered with a shielding container 56 to prevent it from being exposed to the spray. There are no particular restrictions on the shielding container 56 as long as it can cover the flow sensor 55 so as to prevent it from being exposed to the spray. For example, the flow sensor 55 may be placed inside a box-shaped container made of resin, and the connection between the shielding container 56 and the pipe 52 may be sealed with putty or the like. Furthermore, although not shown, a heat insulating material or the like may be placed between the flow sensor 55 and the shielding container 56.

[0039] Furthermore, when the flow rate sensor 55 is disposed inside the test tank 2, the spray corrosion tester 1 may include a temperature adjustment unit 57 for adjusting the temperature inside the shielded container 56. FIG. 6 shows an example of the temperature adjustment unit 57, in which a second air supply unit is provided to supply cooling air to the shielded container 56. In the example shown in FIG. 6, the second air supply unit includes an air inlet 57a, an air outlet 57b, and a compressor (not shown), and cools the inside of the shielded container 56 by introducing air into the space inside the shielded container 56. The air may be branched from the compressor 41 shown in FIG. 1, or a compressor separate from the compressor 41 may be provided. The air discharged from the shielded container 56 may be discharged outside the test tank 2. Furthermore, a thermometer 57c may be disposed inside the shielded container 56. When the thermometer 57c is disposed, the inside of the shielded container 56 may be cooled when the temperature inside the shielded container 56 reaches a temperature that requires lowering. Although not shown, an air temperature regulator may be provided to control the temperature of the air flowing into the shielding container 56. When an air temperature regulator is provided, in addition to cooling the shielding container 56, it is possible to quickly respond when it is necessary to raise the temperature inside the shielding container 56.

[0040] FIG. 7 illustrates another example of the temperature adjustment unit 57, which includes a cooling water supply unit that supplies cooling water to the shielding container 56. In the example illustrated in FIG. 7, the cooling water supply unit includes a pipe 57d inserted into the shielding container 56 and a nozzle 57e formed in the pipe 57d that can spray water flowing through the pipe 57d. In the example illustrated in FIG. 7, the inside of the shielding container 56 is cooled by allowing water to flow into the shielding container 56 through the nozzle 57e. The water may be piped so that tap water can flow in. Note that, to avoid affecting the temperature inside the test chamber 2, the water that flows into the shielding container 56 is preferably discharged to the outside of the test chamber 2 through a discharge pipe 57f. A thermometer 57c may also be provided in the shielding container 56. When the thermometer 57c is provided, the inside of the shielding container 56 can be cooled when the temperature inside the shielding container 56 reaches a temperature that requires lowering. Although not shown, a water temperature regulator may be provided to control the temperature of the water flowing into the shielding container 56. When a water temperature regulator is provided, in addition to cooling the shielding container 56, it is possible to quickly respond when it is necessary to raise the temperature inside the shielding container 56.

[0041] The spray corrosion tester 1 in which the flow rate sensor 55 is arranged as described in Arrangement Example 4 has the following effects. (9) The corrosive liquid used in the spray corrosion tester 1 is salt water or the like, but the flow sensor 55 in Arrangement Example 4 is covered with a shielding container 56. Therefore, the flow sensor 55 is not exposed to the spray, and therefore the risk of the flow sensor 55 failing due to corrosion is reduced compared to the flow sensor 55 described in Patent Document 1. (10) The spray corrosion test may be performed at a temperature higher than room temperature. By providing a heat insulating material in the shielding container 56, the flow sensor 55 can be prevented from becoming too hot, thereby reducing the risk of heat-induced breakdown of the flow sensor 55. (11) Assume that the spray corrosion tester 1 is used in a combined cycle test. In the combined cycle test, the temperature inside the test tank 2 may be heated to, for example, about 70°C. The flow rate sensor 55 is at a higher risk of failure when exposed to a high-temperature environment. On the other hand, if the spray corrosion tester 1 includes a temperature adjustment unit 57 for adjusting the temperature inside the shielding container 56, the risk of the flow rate sensor 55 failing due to heat is lower than when a thermal insulating material is formed.

[0042] Next, when the spray corrosion tester 1 according to the embodiment optionally includes a control unit, the control shown below may be performed, for example, by feeding back the measured value of the flow rate sensor 55 to the control unit. Note that in the following control examples, the control unit is given the reference numeral 8, but the control unit may be the same as the control unit 8 shown in FIG. 1, or a different control unit may be newly provided.

[0043] <Control example 1> The control unit 8 may output an alarm signal when the measurement value of the flow rate sensor 55 deviates from a preset value. As described above, by measuring the flow rate of the corrosive liquid flowing through the pipe 52, any abnormalities occurring in the spray unit 3, the first air supply unit 4, or the corrosive liquid supply unit 5 during continuous operation of the spray corrosion tester 1 can be detected. If the measurement value of the flow rate sensor 55 deviates from a preset value, it indicates that some abnormality has occurred in the spray corrosion tester 1. Based on the output alarm signal, the spray corrosion tester 1 may emit a warning sound or rotate a warning light. Of course, the warning sound and the rotation of the warning light may be combined. The control unit 8 notifies the user of the occurrence of the abnormality, allowing the user to quickly resolve the abnormality. If the abnormality is quickly resolved, the ongoing test can be continued as is, thereby achieving the effect of allowing the test to continue without wasting the test time and test specimens that were used up until the abnormality occurred.

[0044] <Control example 2> When the measurement value of the flow sensor 55 deviates from a preset value, the control unit 8 may control the pressure regulator 42, which controls the supply pressure of the spray-forming air, to adjust the spray volume to a predetermined value. For example, consider a case in which the first nozzle 33 does not lose its function due to deposits or the like, but the opening of the first nozzle 33 narrows due to the deposits. If the opening of the first nozzle 33 narrows while the supply volume of the spray-forming air remains constant, the amount of corrosive liquid drawn up through the first nozzle 33 decreases. Meanwhile, the amount of corrosive liquid drawn up through the first nozzle 33 due to the Venturi effect is proportional to the amount of spray-forming air ejected from the second nozzle. Therefore, for example, if the measurement value of the flow sensor 55 falls below a preset value, the pressure regulator 42 can be controlled to increase the amount of spray-forming air, thereby adjusting the amount of corrosive liquid sprayed into the test chamber 2 to the set amount. Of course, if the measurement value of the flow sensor 55 increases from a preset value due to factors such as an increase in the pressure of the spray-forming air or a misalignment of the first nozzle 33 and the second nozzle 32, the amount of corrosive liquid sprayed inside the test tank 2 can be adjusted to the set amount by controlling the pressure regulator 42 and reducing the amount of spray-forming air.

[0045] <Control example 3> When the control unit 8 adjusts the pressure regulator 42, the control unit 8 may further control the air saturator 43 to control the temperature of the spray-forming air ejected from the second nozzle 32 to a predetermined temperature. The temperature of the spray-forming air ejected from the second nozzle 32 is adjusted to a preset temperature, but adjusting the pressure regulator 42 changes the temperature of the spray-forming air ejected from the second nozzle 32. The pressure inside the air saturator 43 during a salt spray test is generally 98 kPa. JIS Z 2371:2015 exemplifies the combinations of compressed air pressure and water temperature inside the air saturator 43 during a salt spray test as follows: The control unit 8 may control the air saturator 43 with reference to the following examples: [Table 1]

[0046] (Embodiment of Combined Cycle Test Machine 11) Next, an embodiment of a combined cyclic test machine 11 will be described with reference to Fig. 8. Fig. 8 is a schematic diagram showing an outline of the combined cyclic test machine 11 according to the embodiment. Note that, since Fig. 8 is a diagram showing the overall outline of the combined cyclic test machine 11, details such as the arrangement of the flow rate sensor 55, which is a feature of the disclosure of the present application, are not shown to avoid complication.

[0047] A combined cyclic test machine 11 according to the embodiment includes any one of the spray corrosion test machines 1 described above (embodiments of the spray corrosion test machine 1), and is configured to sequentially perform a spray corrosion test and one or more other tests. In the example shown in Fig. 8, the combined cyclic test machine 11 is equipped with a temperature-controlled chamber 12 in addition to the spray corrosion test machine 1, and is capable of sequentially repeating a spray corrosion test, a dry test, and a wet test.

[0048] Temperature-controlled chamber 12 communicates with the interior of test chamber 2 via opening 2K provided on the side of test chamber 2, and is equipped with a fan 13 and a temperature-controlled chamber heater 14. Fan 13 generates a circulating flow by rotation, circulating air between test chamber 2 and temperature-controlled chamber 12. Air introduced from test chamber 2 through opening 2K into temperature-controlled chamber 12 is heated to a predetermined temperature by temperature-controlled chamber heater 14 and supplied into test chamber 2 by the circulating flow generated by fan 13. By simultaneously controlling temperature-controlled chamber 12 and humidity generator 9, the atmosphere within test chamber 2 can be adjusted to a predetermined temperature and humidity during each test process of the combined cycle test.

[0049] The combined cycle test machine 11 may also be equipped with a refrigerator (not shown) that generates low-temperature air below the outside of the test chamber 2. This refrigerator is in communication with the test chamber 2 via an opening (not shown), and introduces some of the air inside the test chamber 2 to generate low-temperature air below the freezing point. By sending this low-temperature air into the test chamber 2, the atmosphere inside the test chamber 2 can be controlled to a low-temperature environment, allowing low-temperature testing to be performed. Note that detailed operations of the combined cycle test machine 11 are omitted here, as they are described in Patent Document 1. The matters described in Patent Document 1 are incorporated herein by reference.

[0050] The combined cyclic test machine 11 according to the embodiment includes any of the spray corrosion test machines 1 described in the embodiment of the spray corrosion test machine 1. Therefore, the combined cyclic test machine 11 has the same effects as the spray corrosion test machine 1.

[0051] (Embodiment of the method for improving the spray corrosion tester 1) Next, an embodiment of a method for improving a spray corrosion tester 1 will be described with reference to Figures 1 to 8. The spray corrosion tester 1 used in the method for improving a spray corrosion tester 1 may be any of the spray corrosion testers 1 described in the above embodiments of the spray corrosion tester 1, or may be another spray corrosion tester 1. Details of the spray corrosion tester 1 will not be described again to avoid redundancy.

[0052] The improved method includes the steps of removing a portion of the side wall 2a or at least a portion of the bottom floor 2b of the test chamber 2, and arranging a second side wall including a convex portion 2c or a second bottom floor having a convex portion 2d in the removed portion of the side wall 2a or bottom floor 2b. In the arranging step, the convex portions 2c, 2d are arranged so as to protrude toward the inside of the test chamber 2, so that the flow sensor 55 is arranged on the convex portions 2c, 2d on the outside of the test chamber 2.

[0053] In the removing step, "removing a portion of the side wall 2a of the test tank 2" means, for example, removing the entire side wall 2a of one of the four side walls of the test tank 2, or removing (cutting out) a portion of one side wall 2a. In addition, in the removing step, "removing at least a portion of the bottom floor 2b" means removing the entire bottom floor 2b, or removing (cutting out) a portion of the bottom floor 2b. There are no particular restrictions on the size, shape, etc. of the side wall 2a or bottom floor 2b to be removed, as long as the flow sensor 55 can be placed outside the test tank 2 from the removed portion of the side wall 2a or bottom floor 2b in the placing step described below.

[0054] In the disposing step, there are no particular limitations on the method of disposing the second side wall or second bottom floor, as long as the flow sensor 55 is disposed on the protruding portions 2c and 2d on the outside of the test chamber 2. For example, a second side wall or second bottom floor is prepared that can cover the portion removed from the test chamber 2 and that can form the protruding portions 2c and 2d. Note that the second side wall or second bottom floor may be divided into parts or may have a curved shape for ease of operation. After disposing the second side wall or second bottom floor so that the flow sensor 55 is on the outside of the test chamber 2, the connecting portion with the test chamber 2 (if the second side wall or second bottom floor is composed of parts, the connecting portion of the parts) may be glued using putty or the like.

[0055] The improved method allows the flow sensor 55 included in the conventional spray corrosion tester 1 to be arranged outside the test tank 2. Therefore, the improved method achieves the same effects as those described in (1) to (7) of the above flow sensor 55 arrangement examples 1 to 3.

[0056] As described above (embodiment of the combined cycle test machine 11), the spray corrosion test machine 1 may be configured as a part of the combined cycle test machine 11. In this case, implementing the improvement method on the spray corrosion test machine 1 that is a part of the combined cycle test machine 11 essentially means implementing the improvement method on the combined cycle test machine 11.

[0057] (Other variations) The spray corrosion tester 1, combined cycle tester 11, and method for improving the spray corrosion tester 1 disclosed in the present application have been described above using several specific embodiments. However, these embodiments are not limited to these, and various modifications are possible. For example, while the spray corrosion tester 1 is configured to measure the flow rate of the corrosive solution, a spray-forming air flow sensor may be used to measure the flow rate of the spray-forming air. In this case, an abnormality in the air nozzle caused by the flow rate of the spray-forming air deviating from a specified value can be detected. Furthermore, in the examples shown in Figures 1 to 5 and 8, the first nozzle 33 and the second nozzle 32 are arranged in approximately perpendicular directions. However, the first nozzle 33 and the second nozzle 32 may be arranged in other directions as long as spray-forming air can be supplied to the second nozzle 32 and the corrosive solution can be sucked up from the first opening of the first nozzle 33 by the Venturi effect. FIG. 9A is a schematic diagram showing another example of the arrangement of the first nozzle 33 and the second nozzle 32, and FIG. 9B is a schematic diagram showing the positional relationship between the first opening 33a of the first nozzle 33 and the second opening 32a of the second nozzle 32 when viewed in the Z direction in FIG. 9A. In the example shown in FIGS. 9A and 9B, the substantially cylindrical first nozzle 33 is covered by the substantially cylindrical second nozzle 32. In the example shown in FIGS. 9A and 9B, spray-forming air is supplied to the second nozzle 32, and the corrosive solution is sucked up from the first opening 33a of the first nozzle 33 by the Venturi effect. Note that in the example shown in FIGS. 9A and 9B, the first opening 33a and the second opening 32a are arranged close to the nozzle via a wall 34. The amount of corrosive solution sucked up by the Venturi effect can be adjusted by adjusting the thickness of the nozzle wall 34. [Industrial Applicability]

[0058] The spray corrosion tester 1 disclosed in the present application reduces the risk of failure of the flow sensor 55. Therefore, it is useful for the tester industry. [Explanation of symbols]

[0059] 1...spray corrosion tester, 2...test tank, 2a...side wall, 2b...bottom floor, 2c, 2d...convex portion, 3...spray portion, 31...spray tower, 31A...cylindrical portion, 31B...direction body, 32...second nozzle, 32a...second opening, 33...first nozzle, 33a...first opening, 34...nozzle wall, 35...sprayer, 4...first air supply portion, 41...compressor, 42...pressure regulator, 43...air saturator, 44...foaming tube, 45...heater, 46...air Supply pipe, 49...conduit, 5...corrosive liquid supply section, 51...solution reservoir, 52...pipe, 53...supply tank, 54...conduit, 55...flow sensor, 56...shielding container, 57...temperature control section, 57a...air inlet section, 57b...air outlet section, 57c...thermometer, 57d...piping, 57e...spout, 57f...exhaust pipe, 8...control section, 9...humidity generation section, 11...combined cycle test machine, 12...temperature control chamber, 13...fan, 14...temperature control chamber heater

Claims

1. A spray corrosion tester including a test tank, a spray unit, a first air supply unit, and a corrosive liquid supply unit, The spray section is a first nozzle having a first tip portion provided with a first opening and through which an etching liquid is supplied; a second nozzle having a second tip end with a second opening adjacent to the first opening; a spray tower having an interior space that accommodates the first tip and the second tip; Including, The corrosive solution can be sprayed into the test chamber, the first air supply unit supplies spray forming air to the second nozzle; The etchant supply unit is a solution reservoir for holding an etching solution; a pipe connecting the solution reservoir and the first nozzle; a flow rate sensor formed in the pipe for measuring the flow rate of the etching solution supplied from the solution reservoir to the first nozzle; Including, The flow sensor is It is placed outside the test chamber or inside the test chamber, When placed in the test chamber, the flow sensor is covered with a shielding container to prevent exposure to spray. Spray corrosion tester.

2. A protrusion protruding toward the inside of the test chamber is formed on a part of the side wall of the test chamber, The flow sensor is located on the outer part of the test chamber at the convex part. The spray corrosion tester according to claim 1.

3. A convex portion that protrudes toward the inside of the test tank is formed on a part of the bottom floor of the test tank, The flow sensor is located on the outer part of the test chamber at the convex part. The spray corrosion tester according to claim 1.

4. When the flow sensor is placed in the test chamber, a temperature adjusting unit is included for adjusting the temperature in the shielded container. The spray corrosion tester according to claim 1.

5. The temperature adjustment unit a second air supply unit that supplies cooling air to the shielding vessel; or a cooling water supply unit for supplying cooling water to the shielding vessel; Contains The spray corrosion tester according to claim 4.

6. Further comprising a control unit, The control unit outputs an alarm signal when the measurement value of the flow sensor deviates from a preset value. The spray corrosion tester according to any one of claims 1 to 5.

7. Further comprising a control unit, the first air supply unit includes a pressure regulator that controls the supply pressure of the spray-forming air; The control unit controls the pressure regulator to adjust the amount of spray supplied to the test tank to a predetermined value when the measurement value of the flow rate sensor deviates from a preset value. The spray corrosion tester according to any one of claims 1 to 5.

8. the first air supply unit further includes an air saturator that adjusts the temperature of the air supplied from the second nozzle; The control unit controls the air saturator to adjust the temperature of the air supplied from the second nozzle to a predetermined temperature when the measurement value of the flow rate sensor deviates from a preset value. The spray corrosion tester according to claim 7.

9. A combined cycle testing machine comprising the spray corrosion testing machine according to any one of claims 1 to 5, and configured to sequentially perform a spray corrosion test and one or more other tests.

10. A method for improving a spray corrosion tester, comprising: The spray corrosion tester includes a test tank, a spray unit, a first air supply unit, and a corrosive liquid supply unit, The spray section is a first nozzle having a first tip portion provided with a first opening and through which an etching liquid is supplied; a second nozzle having a second tip end with a second opening adjacent to the first opening; a spray tower having an interior space that accommodates the first tip and the second tip; Including, The corrosive solution can be sprayed into the test chamber, the first air supply unit supplies spray forming air to the second nozzle; The etchant supply unit is a solution reservoir for holding an etching solution; a pipe connecting the solution reservoir and the first nozzle; a flow rate sensor formed in the pipe for measuring the flow rate of the etching solution supplied from the solution reservoir to the first nozzle; Including, The improvement method is Removing a portion of the side wall or at least a portion of the bottom floor of the test chamber; placing a second side wall including a convex portion or a second bottom floor having a convex portion on the removed side wall or bottom floor portion; Including, In the placing step, the protrusion is placed so as to protrude toward the inside of the test chamber, so that the flow sensor is placed on the protrusion which is outside the test chamber. Improvement method.

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