A multilayer corrosion test device for high-temperature strong acid environment

Abstract

A kind of multilayer corrosion test device for high temperature strong acid environment, including cavity and intermediate layer container arranged in cavity, inner liner container for containing corrosion medium is provided in the intermediate layer container, the cavity forms temperature control layer, intermediate layer container forms isolation layer, inner liner container forms reaction layer;Resistance wire for heating is arranged in the temperature control layer;Compared with prior art, material is placed in inner liner container, by adding corrosion medium in inner liner container, and heating is carried out by resistance wire, high temperature strong acid environment is simulated, so as to realize the test of the corrosion resistance of material, to obtain accurate test data results, to correctly evaluate material performance.

Description

Technical Field

[0001] This utility model relates to the field of corrosion testing technology, specifically to a multilayer corrosion testing device for high-temperature and strong acid environments. Background Technology

[0002] Corrosion-related accidents occur frequently in various industrial sectors, such as chemical, petroleum, aviation, papermaking, and civil construction. Statistics show that global losses due to corrosion reach trillions of dollars annually. Conducting appropriate corrosion evaluation tests on metallic materials before service can significantly reduce the occurrence of such accidents. Corrosion tests can quantitatively or qualitatively determine the corrosion rate and failure mode of metallic materials in specific environments (such as humidity, salt spray, acid and alkaline media), avoiding safety hazards such as strength reduction, perforation, or fracture caused by material corrosion. For example, intergranular corrosion testing can detect the chromium-depleted areas of stainless steel, preventing sudden equipment failure; stress corrosion testing assesses the material's resistance to cracking under the combined action of stress and corrosive media.

[0003] Chinese Patent Application No. 202010288446.4 discloses a static high-temperature molten salt corrosion test device and test method that facilitates multi-time sampling. The disclosed corrosion test device includes a crucible assembly, a connecting rod assembly, and a branch assembly. The crucible assembly is used to hold molten salt. The connecting rod assembly connects the branch assembly and the crucible cover into a whole through a connector to form a stable sample suspension structure. Using this structure can greatly simplify the sampling operation when sampling at multiple time periods. The sample is suspended on the branch to avoid the problem of insufficient contact with molten salt during the test. Chinese Patent Application No. 202110816831.6 discloses a corrosion resistance testing device and a corrosion resistance testing method for coated metal materials. The disclosed corrosion resistance testing device includes: two water-containing material holding parts arranged on an electrophoretic coating and in contact with the electrophoretic coating; two electrodes in contact with the water-containing material respectively housed in each of the two water-containing material holding parts; an external circuit electrically connecting the two electrodes; a temperature regulating element that abuts against the coated metal material via an insulating part and at least regulates the temperature of the coated metal material; a control device connected to the temperature regulating element and controlling the temperature of the temperature regulating element; and an energizing unit provided on the external circuit, which uses one of the two electrodes as an anode and the other as a cathode, and energizes the two electrodes to allow corrosion of the coated metal material to occur.

[0004] Currently, the materials used in laboratory corrosion tests mainly include metals, glass, and polytetrafluoroethylene (PTFE). However, each material has its limitations. For example, metals have insufficient resistance to strong acid media and may react with them to form corrosion products, affecting the results. Glass is brittle and its pressure resistance does not meet requirements. PTFE can withstand most corrosive media, but its operating temperature and pressure resistance are insufficient. Some chemical production processes involve strong acids such as hydrochloric acid, nitric acid, and sulfuric acid, as well as high-temperature environments with strong corrosiveness. To ensure the safe operation of equipment, the materials used in these environments need to undergo actual simulated corrosion resistance tests. Considering the environmental media and potential corrosion conditions of components during actual service, improvements are made to address the shortcomings of existing technologies. Utility Model Content

[0005] The present invention aims to overcome the defects in the prior art and provide a multilayer corrosion testing device for testing the corrosion resistance of materials in high-temperature and strong acid environments, so as to obtain accurate test data results and thus correctly evaluate the material performance.

[0006] To achieve the above-mentioned utility model objectives, the present utility model adopts the following technical solution: a multi-layer corrosion testing device for high-temperature strong acid environment, comprising a cavity and an intermediate layer container disposed in the cavity, wherein the intermediate layer container is provided with an inner liner container for holding corrosive media, the cavity forms a temperature control layer, the intermediate layer container forms an isolation layer, and the inner liner container forms a reaction layer; a resistance wire for heating is disposed in the temperature control layer.

[0007] In a preferred embodiment of this utility model, the temperature control layer, the isolation layer, and the reaction layer are arranged sequentially from the outside to the inside.

[0008] As a preferred embodiment of the present invention, the top of the inner liner container is provided with a sealing end cap, the lower surface of the sealing end cap is provided with a first sealing ring, and the top of the inner liner container is provided with a sealing groove that cooperates with the first sealing ring.

[0009] As a preferred embodiment of this utility model, the side wall of the sealing end cap is provided with several second sealing rings that abut against the inner wall of the inner liner container.

[0010] In a preferred embodiment of this invention, the upper surface of the sealing end cap is higher than the upper surface of the intermediate layer container.

[0011] As a preferred embodiment of this utility model, a sealing cover is provided on the top of the intermediate layer container, and the lower surface of the sealing cover is provided with a receiving groove that cooperates with the sealing end cap.

[0012] As a preferred embodiment of this utility model, a temperature sensor is installed on the sealing cover plate, and the bottom end of the temperature sensor extends into the inner liner container through the sealing cover plate and the sealing end cap.

[0013] As a preferred embodiment of this utility model, the sealing cover plate is provided with a mounting component for placing a temperature sensor, and the sealing end cap is provided with a through hole for the mounting component to pass through.

[0014] In a preferred embodiment of this utility model, the inner diameter of the cavity is the same as the outer diameter of the intermediate layer container, and the inner diameter of the intermediate layer container is the same as the outer diameter of the inner liner container.

[0015] As a preferred embodiment of this utility model, the cavity is configured as an openable / closing structure.

[0016] Compared with the prior art, the beneficial effects of this utility model are: 1. The material is placed in an inner-lined container. A corrosive medium is added to the inner-lined container and heated by a resistance wire to simulate a high-temperature strong acid environment, thereby testing the corrosion resistance of the material to obtain accurate test data results and thus correctly evaluate the material performance. 2. Furthermore, through the temperature control layer, isolation layer and reaction layer formed by the cavity, intermediate container and inner liner container in sequence, the material reacts with the corrosive medium in the inner liner container to prevent corrosion of the isolation layer and improve the service life of the test device. At the same time, the multi-layer structure makes disassembly and maintenance more convenient. 3. Furthermore, a sealing end cap is provided on the inner liner container, and a first sealing ring and a second sealing ring are provided on the sealing end cap. A sealing cover plate is provided on the intermediate layer container. By using multiple sealing rings for sealing, the sealing effect is improved. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a structural schematic diagram of the sealing cover plate; Figure 4 This is a structural diagram of the inner liner container; Figure 5 This is a schematic diagram of the sealed end cap structure; Figure 6 This is a schematic diagram of the cavity structure. Reference numerals: cavity 1, temperature control layer 101, resistance wire 102, semi-cylindrical structure 103, intermediate layer container 2, isolation layer 201, inner liner container 3, reaction layer 301, sealing end cap 302, first sealing ring 3021, second sealing ring 3022, through hole 3023, sealing groove 303, sealing cover plate 4, receiving groove 401, mounting part 402, temperature sensor 5. Detailed Implementation

[0018] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0019] like Figures 1-5 As shown, a multilayer corrosion testing device for high-temperature strong acid environment includes a cavity 1 and an intermediate layer container 2 disposed in the cavity 1. The intermediate layer container 2 is provided with an inner liner container 3 for holding corrosive media. The cavity 1 forms a temperature control layer 101, the intermediate layer container 2 forms an isolation layer 201, and the inner liner container 3 forms a reaction layer 301. A resistance wire 102 for heating is disposed in the temperature control layer 101.

[0020] Furthermore, the cavity 1 is a cylindrical barrel structure, with the intermediate container 2 placed inside the cavity 1. The top of the intermediate container 2 has an annular overlapping edge 202. When the intermediate container 2 enters the cavity 1, the overlapping edge 202 overlaps the top of the cavity 1. The inner liner container 3 is placed inside the intermediate container 2. The corrosive medium reacts with the material in the inner liner container 3. The corrosive medium is a highly corrosive liquid or gas. The material of the inner liner container 3 is polytetrafluoroethylene, and the material of the intermediate container 2 is heat-resistant stainless steel. In practical use, it is only necessary to place the corrosive medium and the sample to be tested inside the inner liner container 3 and adjust the temperature control layer 101 to reach the target temperature to conduct a corrosion test on the sample to be tested. This enables the testing of the corrosion resistance of the material to obtain accurate test data results, thereby correctly evaluating the material performance.

[0021] The temperature control layer 101, the isolation layer 201, and the reaction layer 301 are arranged sequentially from the outside to the inside. Furthermore, the temperature control layer 101, the isolation layer 201, and the reaction layer 301 are formed sequentially by the cavity 1, the intermediate container 2, and the inner liner container 3. The material reacts with the corrosive medium in the inner liner container 3 to prevent corrosion of the isolation layer 201 and improve the service life of the test device. At the same time, the multi-layer structure makes disassembly and maintenance more convenient.

[0022] The inner container 3 is provided with a sealing end cap 302 at the top, and a first sealing ring 3021 is provided on the lower surface of the sealing end cap 302. The top of the inner container 3 is provided with a sealing groove 303 that cooperates with the first sealing ring 3021. Furthermore, the sealing end cap 302 is placed on the inner container 3, the first sealing ring 3021 is provided on the lower surface of the edge of the sealing end cap 302, and a sealing groove 303 is provided on the top side wall of the inner container 3. When the sealing end cap 302 is placed in the inner container 3, the first sealing ring 3021 is located in the sealing groove 303, thereby achieving a seal between the sealing end cap 302 and the inner container 3.

[0023] The side wall of the sealing end cap 302 is provided with a plurality of second sealing rings 3022 that abut against the inner wall of the inner liner container 3. Furthermore, the plurality of second sealing rings 3022 are distributed along the height direction of the side wall of the sealing end cap 302, thereby improving the sealing effect between the sealing end cap 302 and the inner liner container 3.

[0024] The upper surface of the sealing end cap 302 is higher than the upper surface of the intermediate layer container 2. When the sealing end cap 302 is placed in the inner liner container 3, the top of the sealing end cap 302 is higher than the intermediate layer container 2, which makes it convenient to remove the sealing end cap 302 from the inner liner container 3.

[0025] A sealing cover plate 4 is provided on the top of the intermediate layer container 2. The lower surface of the sealing cover plate 4 is provided with a receiving groove 401 that cooperates with the sealing end cover 302. Furthermore, the sealing cover plate 4 is fixedly connected to the intermediate layer container 2 by bolts. The receiving groove 401 ensures that the sealing end cover 302 will not interfere with the sealing cover plate 4, thereby ensuring the sealing performance between the sealing cover plate 4 and the intermediate layer container 2.

[0026] A temperature sensor 5 is installed on the sealing cover plate 4. The bottom end of the temperature sensor 5 extends into the inner liner container 3 through the sealing cover plate 4 and the sealing end cap 302. Furthermore, the sealing cover plate 4 is provided with a mounting part 402 for placing the temperature sensor 5, and the sealing end cap 302 is provided with a through hole 3023 for the mounting part 402 to pass through. The temperature in the inner liner container 3 is detected by the temperature sensor 5, thereby ensuring that the temperature meets the test requirements.

[0027] The inner diameter of cavity 1 is the same as the outer diameter of intermediate layer container 2, and the inner diameter of intermediate layer container 2 is the same as the outer diameter of inner liner container 3. When intermediate layer container 2 is placed into cavity 1, the outer wall of intermediate layer container 2 is attached to the inner wall of cavity 1. When inner liner container 3 is placed into intermediate layer container 2, the outer wall of inner liner container 3 is attached to the inner wall of intermediate layer container 2, ensuring that cavity 1, intermediate layer container 2 and inner liner container 3 will not shake, thus ensuring safety during the test.

[0028] like Figure 6As shown, in addition to the barrel-shaped structure, the cavity 1 can also be configured as an openable structure, that is, the cavity 1 is divided into two hinged semi-cylindrical structures 103. When the intermediate layer container 2 is placed on the cavity 1, the two semi-cylindrical structures 103 are joined together, and a latch (not shown in the figure) is provided at the side opening of the semi-cylindrical structure 103 to lock the two semi-cylindrical structures 103. The openable structure facilitates the placement and removal of the intermediate layer container 2 without having to lift the intermediate layer container 2 out of the cavity 1, and also facilitates the cleaning of the device.

[0029] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0030] Although this document frequently uses reference numerals from the figures, such as cavity 1, temperature control layer 101, resistance wire 102, semi-cylindrical structure 103, intermediate container 2, isolation layer 201, inner liner container 3, reaction layer 301, sealing end cap 302, first sealing ring 3021, second sealing ring 3022, through hole 3023, sealing groove 303, sealing cover plate 4, receiving groove 401, mounting component 402, and temperature sensor 5, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A multilayer corrosion testing apparatus for high-temperature, strong acid environments, characterized in that, It includes a cavity (1) and an intermediate layer container (2) disposed in the cavity (1). The intermediate layer container (2) is provided with an inner liner container (3) for holding corrosive media. The cavity (1) forms a temperature control layer (101), the intermediate layer container (2) forms an isolation layer (201), and the inner liner container (3) forms a reaction layer (301). The temperature control layer (101) is provided with a resistance wire (102) for heating.

2. The multilayer corrosion testing device for high-temperature strong acid environments according to claim 1, characterized in that, The temperature control layer (101), the isolation layer (201), and the reaction layer (301) are arranged sequentially from the outside to the inside.

3. The multilayer corrosion testing device for high-temperature strong acid environments according to claim 1, characterized in that, The inner liner container (3) is provided with a sealing end cap (302) at the top, a first sealing ring (3021) is provided on the lower surface of the sealing end cap (302), and a sealing groove (303) is provided at the top of the inner liner container (3) to cooperate with the first sealing ring (3021).

4. The multilayer corrosion testing device for high-temperature strong acid environments according to claim 3, characterized in that, The sealing end cap (302) has several second sealing rings (3022) on its side wall that abut against the inner wall of the inner liner container (3).

5. The multilayer corrosion testing apparatus for high-temperature strong acid environments according to claim 3, characterized in that, The upper surface of the sealing end cap (302) is higher than the upper surface of the intermediate layer container (2).

6. The multilayer corrosion testing device for high-temperature strong acid environments according to claim 3, characterized in that, The intermediate layer container (2) is provided with a sealing cover plate (4) on the top, and the lower surface of the sealing cover plate (4) is provided with a receiving groove (401) that cooperates with the sealing end cap (302).

7. The multilayer corrosion testing apparatus for high-temperature strong acid environments according to claim 6, characterized in that, A temperature sensor (5) is installed on the sealing cover plate (4). The bottom end of the temperature sensor (5) extends into the inner liner container (3) through the sealing cover plate (4) and the sealing end cap (302).

8. The multilayer corrosion testing apparatus for high-temperature strong acid environments according to claim 7, characterized in that, The sealing cover plate (4) is provided with a mounting part (402) for placing the temperature sensor (5), and the sealing end cover (302) is provided with a through hole (3023) for the mounting part (402) to pass through.

9. A multilayer corrosion testing device for high-temperature strong acid environments according to claim 1, characterized in that, The inner diameter of the cavity (1) is the same as the outer diameter of the intermediate layer container (2), and the inner diameter of the intermediate layer container (2) is the same as the outer diameter of the inner liner container (3).

10. A multilayer corrosion testing device for high-temperature strong acid environments according to claim 1, characterized in that, The cavity (1) is configured to open and close.

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