Device for testing corrosion resistance of metal alloy surface

Abstract

The invention relates to the technical field of metal alloy corrosion resistance testing, and provides a metal alloy surface corrosion resistance testing device which comprises a rack and a cable, anchorage devices are arranged at the top and the bottom of the rack, the cable is installed between the two anchorage devices, a testing barrel is installed in the middle of the rack, and the testing barrel is connected with the cable. Four multi-tube bodies are arranged in the testing barrel, and a low-temperature cold air dryer and a blast heat dryer are mounted on the rack; under the cooperation of low-temperature cold air, high-temperature hot air and a corrosion solution, a low-temperature high-humidity and high-temperature high-humidity environment is created, so that the corrosion resistance of the cable is tested, an automatic telescopic rod pulls and pushes a rotating rod to rotate upwards or downwards, the distance among four multi-pipe bodies is changed, the pressure of the corrosion solution sprayed on the cable is adjusted, and the corrosion resistance of the cable is improved. Therefore, the penetration depth of the corrosion solution to the cable is controlled, and the corrosion effect of the cable when the corrosion solution permeates different depths is simulated.

Description

Technical Field

[0001] The present invention relates to the technical field of metal alloy anti-corrosion performance testing, and specifically to a metal alloy surface anti-corrosion performance testing device. Background Art

[0002] Cables are an indispensable and important part of modern engineering construction. They are widely used in many fields such as large bridges, building structures, cableways, etc. Cables usually use high-strength galvanized steel wires or carbon steel alloys such as steel strands. In bridge construction, cables are often corroded by humid environments, seawater, etc. With the continuous development of construction technology and the growing demand for engineering projects, the anti-corrosion requirements for cables are also getting higher and higher. Therefore, higher quality monitoring and safety assessment requirements for cables are required. However, the existing anti-corrosion performance testing devices still have shortcomings.

[0003] In low temperature and high temperature environments, cables have different corrosion conditions, and cables will also be affected by corrosion performance when affected by stress, which increases equipment requirements. Therefore, existing corrosion resistance testing machines need to adapt to low temperature and high temperature environments when testing, which increases the cost of equipment; cables are often subjected to alternating processes of salt spray corrosion and drying, which accelerates the corrosion rate and degree of corrosion. Existing corrosion resistance testing machines directly immerse the cables in corrosive liquids for corrosion. The process of changing to different environments is relatively complicated, and the penetration depth of the corrosive solution into the cable cannot be controlled, and thus the corrosion effect of the cable when the corrosive solution penetrates at different depths cannot be simulated; at the same time, the corrosion products produced by cable corrosion are easily accumulated on the cable, hindering the penetration of the corrosive solution or changing the pH value of the corrosive environment, affecting the corrosion effect of the corrosive solution, and thus affecting the accuracy of the cable corrosion fatigue test.

[0004] Therefore, the present invention provides a device for testing the anti-corrosion performance of a metal alloy surface. Summary of the invention

[0005] The present invention provides a metal alloy surface anti-corrosion performance testing device, which solves the problems existing in the background technology by setting test barrels with different test environments for testing.

[0006] The technical solution of the present invention is as follows: A metal alloy surface corrosion resistance testing device comprises: a frame and a cable, wherein the frame is provided with anchors at the top and bottom, the cable is installed between two anchors, a test barrel is installed in the middle of the frame, four multi-tube bodies are arranged in the test barrel, the cable passes through the center of the test barrel, a low-temperature cold air dryer and a blast heat dryer are installed on the frame, the low-temperature cold air dryer is connected to the test barrel through a copper tube 1, and the blast heat dryer is connected to the test barrel through a copper tube 2, a liquid storage barrel is installed on the frame, a plurality of infusion tubes 1 are connected between the liquid storage barrel and the bottom of the test barrel, a liquid storage barrel is fixedly connected with a liquid infusion tube 2, a liquid pump is installed on the liquid infusion tube 2, and a current clamp is installed on the frame, and the current clamp is clamped on the cable.

[0007] Preferably, the test barrel is divided into a cylindrical barrel body and a conical barrel body which are arranged upper and lower, the cylindrical barrel body is connected by two semi-cylindrical bodies through a rotating shaft, and a motor for driving the rotating shaft to rotate is installed on the cylindrical barrel body, and a sealing strip is fixedly connected to the contact position of the two semi-cylindrical bodies, a semicircular hole is opened in the top center of the two semi-cylindrical parts of the test barrel, and a circular hole is opened in the bottom center of the test barrel, the radius and depth of the semi-circular hole are the same as those of the circular hole, and sealing rings are fixedly connected in the semi-circular hole and the circular hole, and a metal sleeve is fixedly connected to the bottom of the test barrel, and the metal sleeve covers the upper surface of the sealing ring at the bottom of the test barrel.

[0008] Preferably, the sealing ring at the top of the test barrel is in the shape of a hollow cylinder, and the sealing ring at the bottom is in the shape of a hollow frustum.

[0009] Preferably, a liquid replenishment funnel is fixedly connected to the side of the liquid storage barrel, and a liquid discharge port is opened at the bottom of the liquid storage barrel.

[0010] Preferably, four automatic telescopic rods are evenly installed on the top of the test barrel, and the heads of the automatic telescopic rods pass through the test barrel and enter the interior of the test barrel. Two rotating rods are arranged in the test barrel and below the four automatic telescopic rods. The heads of the automatic telescopic rods are fixedly connected with a second circular ring, and the rotating rods near the top of the test barrel pass through the second circular ring. One end of the two rotating rods is rotatably connected to the inner wall of the test barrel, and the other end is rotatably connected to a multi-tube body. The four multi-tube bodies are composed of a plurality of arc tubes and are interconnected, and a plurality of rows of nozzles are provided on the inner arc surface of the multi-tube body.

[0011] Preferably, four metal hoses are installed on the top of the test barrel, one ends of the four metal hoses are respectively fixedly connected and communicated with four multi-tube bodies, and the other ends pass through the test barrel and are installed with a connecting head, and four infusion tubes three are installed at one end of the infusion tube two, one ends of the four infusion tubes three are fixedly connected and communicated with the infusion tube two, and the other ends are connected to the metal hoses through the connecting head.

[0012] Preferably, an actuator is installed on the top of the frame, and the anchor on the top of the frame is installed on the actuator.

[0013] Preferably, the test barrel is made of Hastelloy or titanium alloy.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention inputs cold air into the test barrel through a low-temperature cold air dryer to reduce the temperature in the test barrel, and presses a corrosive solution into the test barrel through a liquid pump to test the anti-corrosion performance of the cable in a low-temperature environment; inputs dry hot air into the test barrel through a blast hot dryer to increase the temperature in the test barrel, and presses a corrosive solution into the test barrel through a liquid pump to test the anti-corrosion performance of the cable in a high-temperature environment. With the cooperation of low-temperature cold air, high-temperature hot air and corrosive solution, a low-temperature and high-humidity environment or a high-temperature and high-humidity environment is created to test the anti-corrosion performance of the cable.

[0015] 2. The present invention pulls the automatic telescopic rod upward or downward and pushes the rotating rod to rotate, so that the two rotating rods drive the four multi-tube bodies to move, thereby adjusting the pressure of the corrosive solution sprayed on the cable by changing the distance between the four multi-tube bodies, thereby controlling the penetration depth of the corrosive solution into the cable, and then simulating the corrosion effect of the cable when the corrosive solution penetrates at different depths, and calculating the penetration depth of the corrosive solution by the current flowing through the current clamp, thereby obtaining the corrosion conditions of the cable at different penetration depths, providing technical support for subsequent cable application scenarios.

[0016] 3. The present invention can improve the uniformity of the corrosion of the cable by the corrosive solution by allowing the corrosive solution to flow along the surface of the cable; at the same time, the sprayed corrosive solution flows into the liquid storage barrel through the infusion tube at the bottom of the test barrel, and the liquid supply pump draws it again, so that the cable is continuously corroded during the circulation process, thereby simulating the corrosion of the cable in a corrosive environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a stereogram of the test device of the present invention; Figure 2 is a partial stereogram of the testing device of the present invention; Figure 3 is a three-dimensional diagram of the internal structure of the test barrel of the present invention; Figure 4 It is a partial stereogram of the test barrel of the present invention.

[0018] In the figure: 1. Frame; 11. Anchor; 2. Cable; 3. Test barrel; 31. Multi-tube body; 32. Cylindrical barrel body; 33. Conical barrel body; 34. Motor; 35. Sealing strip; 36. Semicircular hole; 37. Round hole; 38. Sealing ring; 39. Metal sleeve; 310. Automatic telescopic rod; 311. Rotating rod; 312. Ring 2; 313. Arc tube; 314. Nozzle; 315. Metal hose; 316. Connector; 317. Infusion tube 3; 4. Low-temperature cold air dryer; 41. Copper tube 1; 5. Blast hot dryer; 51. Copper tube 2; 6. Liquid storage barrel; 61. Infusion tube 1; 62. Infusion tube 2; 63. Liquid pump; 64. Liquid replenishment funnel; 65. Drain port; 7. Current clamp; 8. Actuator. DETAILED DESCRIPTION

[0019] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0020] Embodiment 1: like Figure 1-Figure 4 As shown, the present invention provides a metal alloy surface corrosion resistance testing device, comprising: a frame 1 and a cable 2, the frame 1 is provided with anchors 11 at the top and bottom, the cable 2 is installed between the two anchors 11, a test barrel 3 is installed in the middle of the frame 1, four multi-tube bodies 31 are arranged in the test barrel 3, the cable 2 passes through the center of the test barrel 3, a low-temperature cold air dryer 4 and a blast heat dryer 5 are installed on the frame 1, the low-temperature cold air dryer 4 is connected to the test barrel 3 through a copper tube 1 41, and can input dry cold air into the test barrel 3, the blast heat dryer 5 is connected to the test barrel 3 through a copper tube 2 51, and can input dry hot air into the test barrel 3, a liquid storage barrel 6 is installed on the frame 1, a plurality of infusion tubes 1 61 are connected between the liquid storage barrel 6 and the bottom of the test barrel 3, a second infusion tube 62 is fixedly connected to the liquid storage barrel 6, and a liquid pump 63 is installed on the second infusion tube 62, and a current clamp 7 is installed on the frame 1, and the current clamp 7 is clamped on the cable 2.

[0021] like Figure 1-Figure 3 As shown, the test barrel 3 is divided into a cylindrical barrel body 32 and a conical barrel body 33 which are arranged up and down. The cylindrical barrel body 32 is connected by two semi-cylindrical bodies through a rotating shaft, and a motor 34 for driving the rotating shaft to rotate is installed on the cylindrical barrel body 32. A sealing strip 35 is fixedly connected to the contact position of the two semi-cylindrical bodies. A semicircular hole 36 is opened at the center of the top of the two semi-cylindrical parts of the test barrel 3, and a circular hole 37 is opened at the center of the bottom of the test barrel 3. The radius and depth of the semi-circular hole 36 and the circular hole 37 are the same, and sealing rings 38 are fixedly connected in the semi-circular hole 36 and the circular hole 37. A metal sleeve 39 is fixedly connected to the bottom of the test barrel 3, and the metal sleeve 39 covers the upper surface of the sealing ring 38 at the bottom of the test barrel 3.

[0022] The sealing ring 38 at the top of the test barrel 3 is in the shape of a hollow column, and the sealing ring 38 at the bottom is in the shape of a hollow frustum, which cooperates with the test barrel 3 to form a seal.

[0023] When installing the cable 2, first fix one end of the cable 2 in the anchor 11 at the bottom of the frame 1, then open the two semi-cylindrical bodies of the test barrel 3, and pass the cable 2 through the sealing ring 38 from the circular hole 37 at the bottom of the test barrel 3 and the semi-circular hole 36 at the top of the test barrel 3 in turn, then close the two semi-cylindrical bodies of the test barrel 3, connect the infusion tube 317 and the metal hose 315 through the connector 316, and finally install the other end of the cable 2 in the anchor 11 at the top of the frame 1, and the anti-corrosion performance test can be carried out; before the test starts, clamp the current clamp 7 at both ends of the cable 2, and energize the current clamp 7, and analyze the corrosion degree of the cable 2 by measuring the current data, so as to obtain the anti-corrosion performance of the cable 2.

[0024] During the anti-corrosion performance test in a low-temperature environment, cold air is input into the test barrel 3 through the low-temperature cold air dryer 4 to lower the temperature inside the test barrel 3, and a corrosive solution is pressed into the test barrel 3 through the liquid pump 63 to test the anti-corrosion performance of the cable 2 in a low-temperature environment.

[0025] During the anti-corrosion performance test in a high-temperature environment, the blower hot dryer 5 is started to input dry hot air into the test barrel 3 to increase the temperature in the test barrel 3, and the corrosive solution is pressed into the test barrel 3 through the liquid pump 63 to test the anti-corrosion performance of the cable 2 in a high-temperature environment.

[0026] With the cooperation of low-temperature cold air, high-temperature hot air and corrosive solution, a low-temperature and high-humidity environment and a high-temperature and high-humidity environment are created to test the anti-corrosion performance of the cable 2.

[0027] The sealing ring 38 and the sealing strip 35 ensure the sealing of the test barrel 3 to prevent the entry of external air, avoid the overflow of cold air and hot air, and affect the corrosion efficiency of the corrosion solution, thereby affecting the accuracy of the experiment; at the same time, it can prevent the corrosion solution from leaking and polluting the environment.

[0028] After the cable 2 has been corroded for a period of time, the liquid pump 63 is turned off, the input of the corrosive solution is stopped, and the low-temperature cold air dryer 4 or the blower hot dryer 5 is started continuously to input dry cold air or hot air into the test barrel 3 to dry the surface of the cable 2, thereby obtaining the corrosion condition of the cable 2 with the corrosive solution infiltrated on the surface in a dry environment, and testing the corrosion resistance of the cable 2 in this condition. At the same time, the motor 34 is started to drive the two semi-cylinders of the cylindrical barrel 32 to rotate, and one of the semi-cylinders is opened for ventilation to accelerate the drying of the cable 2.

[0029] like Figure 1-Figure 4As shown, the device cools down the cable 2 by setting up the test barrel 3, simulating the corrosion of the cable 2 in low-temperature and high-temperature environments, and only cools down part of the cable 2, thereby reducing the impact of the low-temperature and high-temperature environments on the stability and accuracy of the test machine, reducing the difficulty of installing and testing the cable 2 in low-temperature and high-temperature environments, and further reducing the cost of operating the experimental equipment in low-temperature and high-temperature environments.

[0030] The test barrel 3 is made of Hastelloy or titanium alloy, which has high corrosion resistance and prevents the corrosive solution from damaging the test barrel 3. At the same time, the surface of Hastelloy or titanium alloy is smooth, which prevents the corrosive solution from adhering thereto, allowing the corrosive solution to enter the conical barrel body 33.

[0031] Embodiment 2: like Figure 2-Figure 4 As shown, four automatic telescopic rods 310 are evenly installed on the top of the test barrel 3, and the heads of the automatic telescopic rods 310 pass through the test barrel 3 and enter the interior of the test barrel 3. Two rotating rods 311 are arranged in the test barrel 3 and below the four automatic telescopic rods 310. The heads of the automatic telescopic rods 310 are fixedly connected with a ring 2 312, and the rotating rod 311 close to the top of the test barrel 3 passes through the ring 2 312. One end of the two rotating rods 311 is rotatably connected to the inner wall of the test barrel 3, and the other end is rotatably connected to the multi-tube body 31. The four multi-tube bodies 31 are composed of a plurality of arc tubes 313 and are connected to each other, and a plurality of rows of nozzles 314 are provided on the inner arc surface of the multi-tube body 31.

[0032] Four metal hoses 315 are installed on the top of the test barrel 3, one ends of the four metal hoses 315 are fixedly connected and communicated with the four multi-tube bodies 31 respectively, and the other ends pass through the test barrel 3 and are installed with a connector 316. Four infusion tubes three 317 are installed at one end of the infusion tube two 62, one ends of the four infusion tubes three 317 are fixedly connected and communicated with the infusion tube two 62, and the other ends are connected to the metal hose 315 through the connector 316.

[0033] The corrosive solution is injected into the liquid storage barrel 6 and pressurized by the liquid pump 63. The pressurized corrosive solution is transported into the multi-tube body 31 through the second liquid infusion pipe 62, the third liquid infusion pipe 317, and the metal hose 315, and sprayed onto the cable 2 through the nozzle 314.

[0034] When conducting an anti-corrosion performance test, the automatic telescopic rod 310 is pulled upward or downward to push the rotating rod 311 to rotate, so that the two rotating rods 311 drive the four multi-tube bodies 31 to move, thereby changing the distance between the four multi-tube bodies 31, and adjusting the pressure of the corrosion solution sprayed on the cable 2, thereby controlling the penetration depth of the corrosion solution into the cable 2, and then simulating the corrosion effect of the cable 2 when the corrosion solution penetrates at different depths, and calculating the penetration depth of the corrosion solution by the current flowing through the current clamp 7, and then obtaining the corrosion conditions of the cable 2 at different penetration depths, providing technical support for subsequent application scenarios of the cable 2.

[0035] At the same time, the multi-tube body 31 is composed of and communicated with multiple arc tubes 313, so that the corrosive solution can flow in the multiple arc tubes 313, which can not only provide a larger area of ​​corrosion environment, but also balance the pressure of the corrosive solution through the multiple arc tubes 313, and spray the corrosive solution through multiple rows of nozzles 314 at the same time, thereby increasing the uniformity of spraying, making the penetration depth of the corrosive solution on the cable 2 more uniform and improving the accuracy of the experiment; because there is a metal sleeve 39 at the center of the bottom of the test barrel 3, the corrosive solution will flow on the metal sleeve 39, reducing the corrosion of other parts of the test barrel 3 and increasing the service life of the test barrel 3.

[0036] It should be noted that after the cable 2 reacts with the corrosive solution, corrosion products will be produced, which will hinder the penetration of the corrosive solution or change the pH value of the corrosive environment. Therefore, when the corrosive solution is sprayed on the cable 2 through the nozzle 314, the corrosion products on the surface of the cable 2 can be washed away, thereby improving the accuracy of the anti-corrosion performance test.

[0037] Furthermore, when the cable 2 is tested for its corrosion resistance, the corrosion solution flows along the surface of the cable 2, which can improve the uniformity of the corrosion of the cable 2 by the corrosion solution. At the same time, the sprayed corrosion solution flows into the liquid storage barrel 6 through the liquid infusion tube 61 at the bottom of the test barrel 3, and the liquid supply pump 63 draws the solution again, thereby continuously corroding the cable 2 during the circulation process, thereby simulating the corrosion of the cable 2 in a corrosive environment.

[0038] like Figure 2-Figure 3 As shown, a liquid replenishment funnel 64 is fixedly connected to the side of the liquid storage barrel 6 , and a liquid discharge port 65 is opened at the bottom of the liquid storage barrel 6 . Liquid is added through the liquid replenishment funnel 64 and discharged through the liquid discharge port 65 .

[0039] The liquid storage barrel 6 is provided with a liquid replenishing funnel 64, and antifreeze can be added through the liquid replenishing funnel 64 to prevent the corrosive solution from condensing, or acetic acid can be added to reduce the pH value of the corrosive solution, so as to help simulate different corrosive environments during experiments.

[0040] The cable 2 may break during the experiment. When the current through the current clamp 7 is measured to be zero, the cable 2 is in a broken state. At this time, the automatic telescopic rod 310 is immediately extended, and the four multi-tube bodies 31 are moved to the inner wall of the test barrel 3 through the two rotating rods 311 to prevent the broken cable 2 from damaging the multi-tube bodies 31 in the test barrel 3.

[0041] Embodiment three: like Figure 1 As shown, an actuator 8 is installed on the top of the frame 1 , and an anchor 11 on the top of the frame 1 is installed on the actuator 8 .

[0042] Stress is applied to the anchor 11 and the cable 2 by the actuator 8, thereby simulating the anti-corrosion performance of the cable 2 under stress, improving the accuracy of the test, and not being affected by low temperature or high temperature.

[0043] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A metal alloy surface anti-corrosion performance testing device, comprising: A frame (1) and a cable (2), characterized in that: the frame (1) is provided with anchors (11) at the top and bottom, the cable (2) is installed between the two anchors (11), a test barrel (3) is installed in the middle of the frame (1), four multi-tube bodies (31) are arranged in the test barrel (3), the cable (2) passes through the center of the test barrel (3), a low-temperature cold air dryer (4) and a blast hot dryer (5) are installed on the frame (1), the low-temperature cold air dryer (4) is connected to the test barrel (3) through a copper tube (4 1) is connected to a test barrel (3), the blast heat dryer (5) is connected to the test barrel (3) through a second copper tube (51), a liquid storage barrel (6) is installed on the frame (1), a plurality of first infusion tubes (61) are connected between the liquid storage barrel (6) and the bottom of the test barrel (3), a second infusion tube (62) is fixedly connected to the liquid storage barrel (6), a liquid pump (63) is installed on the second infusion tube (62), and a current clamp (7) is installed on the frame (1), and the current clamp (7) is clamped on the cable (2).

2. The metal alloy surface anti-corrosion performance testing device according to claim 1, characterized in that: The test barrel (3) is divided into a cylindrical barrel body (32) and a conical barrel body (33) arranged in an upper and lower manner. The cylindrical barrel body (32) is composed of two semi-cylindrical bodies connected by a rotating shaft, and a motor (34) for driving the rotating shaft to rotate is installed on the cylindrical barrel body (32). A sealing strip (35) is fixedly connected to the contact position of the two semi-cylindrical bodies. A semi-circular hole (36) is opened at the center of the top of the two semi-cylindrical parts of the test barrel (3). A circular hole (37) is opened at the center of the bottom of the test barrel (3). The semi-circular hole (36) and the circular hole (37) have the same radius and depth, and a sealing ring (38) is fixedly connected in the semi-circular hole (36) and the circular hole (37). A metal sleeve (39) is fixedly connected to the bottom of the test barrel (3), and the metal sleeve (39) covers the upper surface of the sealing ring (38) at the bottom of the test barrel (3).

3. The metal alloy surface anti-corrosion performance testing device according to claim 2, characterized in that: The sealing ring (38) at the top of the test barrel (3) is in the shape of a hollow column, and the sealing ring (38) at the bottom is in the shape of a hollow frustum.

4. The metal alloy surface anti-corrosion performance testing device according to claim 1, characterized in that: A liquid replenishing funnel (64) is fixedly connected to the side of the liquid storage barrel (6), and a liquid discharge port (65) is provided at the bottom of the liquid storage barrel (6).

5. The metal alloy surface corrosion resistance testing device according to claim 1, characterized in that: Four automatic telescopic rods (310) are evenly mounted on the top of the test barrel (3). The heads of the automatic telescopic rods (310) pass through the test barrel (3) and enter the interior of the test barrel (3). Two rotating rods (311) are arranged in the test barrel (3) and below the four automatic telescopic rods (310). The heads of the automatic telescopic rods (310) are fixedly connected to a second circular ring (312). The rotating rods (311) near the top of the test barrel (3) pass through the second circular ring (312). One end of the two rotating rods (311) is rotatably connected to the inner wall of the test barrel (3), and the other end is rotatably connected to a multi-tube body (31). The four multi-tube bodies (31) are composed of a plurality of arc-shaped tubes (313) and are interconnected, and a plurality of rows of nozzles (314) are provided on the inner arc surface of the multi-tube body (31).

6. The metal alloy surface anti-corrosion performance testing device according to claim 1, characterized in that: Four metal hoses (315) are installed on the top of the test barrel (3), one end of the four metal hoses (315) are respectively fixedly connected to and communicate with the four multi-tube bodies (31), and the other end passes through the test barrel (3) and is installed with a connector (316), and one end of the infusion tube 2 (62) is installed with four infusion tubes 3 (317), one end of the four infusion tubes 3 (317) are all fixedly connected to and communicate with the infusion tube 2 (62), and the other end is connected to the metal hose (315) through the connector (316).

7. The metal alloy surface anti-corrosion performance testing device according to claim 1, characterized in that: An actuator (8) is installed on the top of the frame (1), and an anchor (11) on the top of the frame (1) is installed on the actuator (8).

8. The metal alloy surface anti-corrosion performance testing device according to claim 1, characterized in that: The test barrel (3) is made of Hastelloy or titanium alloy.

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