Micro-surname corrosion risk assessment test device for deep sea environment

Abstract

The invention belongs to the technical field of material corrosion test devices, and discloses a micro-surname corrosion risk assessment test device for a deep sea environment, the device comprises: a device main body, the device main body is cylindrical, and a cavity in the cylinder is provided with a sample fixing position; the supporting plates are in a porous plate shape, and the two supporting plates are detachably arranged at the ends of the device body respectively. The polymer filter membrane is arranged on the outer side of the supporting plate and completely covers the supporting plate; the two cover plates are detachably mounted at the two ends of the device main body and are matched with the device main body to clamp the supporting plate and the macromolecular filter membrane. The device is simple and reasonable in structure, the problem that microbial factors cannot be peeled off in a traditional deep sea corrosion test is solved by adopting a modular structural design and designing a pressure self-adaptive filtering system (a supporting plate and a polymer filter membrane), the deep sea microbial corrosion risk can be further quantified, and the test accuracy is improved. And a key theoretical support is provided for targeted protection of deep-sea microbial corrosion.

Description

Technical Field

[0001] The present invention belongs to the technical field of material corrosion testing devices, and in particular relates to a microbial corrosion risk assessment testing device for deep-sea environments. Background Art

[0002] Metal materials inevitably suffer from corrosion in deep-sea environments. This is the result of the interaction between the material and the environment. High hydrostatic pressure and microorganisms in deep-sea environments are significant corrosion influencing factors. Traditional deep-sea corrosion testing equipment exposes materials directly to seawater, obtaining information such as corrosion rates under the combined effects of various factors. However, it is difficult to determine the extent of microbial influence on corrosion.

[0003] Chinese patent publication number CN112881272A discloses a deep-sea corrosion testing device, but it cannot isolate microbial factors, making it impossible to quantify the corrosion impact of deep-sea microorganisms and leaving the risk of deep-sea microbial corrosion unknown. Therefore, developing a testing device capable of assessing microbial corrosion risk in deep-sea environments is of great significance for meeting the needs of marine equipment and material research and development and application. Summary of the Invention

[0004] To overcome the above technical problems, the present invention provides a test device for assessing the risk of microbial corrosion in deep-sea environments. By setting up a composite structure of a support plate and a polymer filter membrane, it can achieve microbial isolation while withstanding the impact of deep-sea pressure. By comparing with an experimental group without isolation, the risk of microbial corrosion in the deep-sea environment can be evaluated.

[0005] The present invention adopts the following technical solutions: The microbial corrosion risk assessment test device for deep-sea environment includes: a device body, which is cylindrical and has a sample fixing position in the cavity inside the cylinder; a support plate, which is a porous plate and two support plates are detachably arranged at the ends of the device body; a polymer filter membrane, which is arranged on the outside of the support plate and completely covers the support plate; and two cover plates, which are detachably installed at both ends of the device body and cooperate with the device body to clamp the support plate and the polymer filter membrane.

[0006] Preferably, a circular groove is provided along the circumference of the inner opening of the end portion of the device body, and the depth of the circular groove is equal to the thickness of the support plate.

[0007] Preferably, an annular sealing groove is provided along the circumference of the end portion of the device body, the sealing groove is located on the outer circumference of the circular groove, and a sealing ring is provided in the sealing groove.

[0008] Preferably, the polymer filter membrane is made of at least one of nylon, cellulose, polycarbonate, polytetrafluoroethylene, polyvinylidene fluoride, and polyethersulfone, and has a cut-off pore size of ≤0.22 μm.

[0009] Preferably, the device body and the cover are made of acrylonitrile-butadiene-styrene copolymer or polypropylene.

[0010] Preferably, a plurality of axial bolt holes 1 are evenly distributed around the device body, and bolt holes 2 are correspondingly provided on the cover plate. The cover plates at both ends are fastened to the device body by bolts, gaskets, elastic washers and nuts.

[0011] Preferably, the supporting layer, screws, washers, elastic washers and nuts are made of Hastelloy or titanium alloy.

[0012] Preferably, the sample fixing position is an annular protrusion provided along the circumferential direction on the inner wall of the device body, and an axial tie hole is provided on the annular protrusion.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention constructs a bidirectional symmetrical filtration system. Through the composite structure of the support plate and the polymer filter membrane, it can achieve microbial barrier while withstanding the impact of deep-sea pressure. By comparing with the experimental group without isolation, the risk of microbial corrosion in the deep-sea environment can be evaluated, which can provide a reference for the research and development of marine equipment materials and corrosion protection work. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention (partial cross-section).

[0015] Figure 2 This is an exploded schematic diagram of the assembly of the present invention; Figure 3 It is an overall schematic diagram of the present invention; Figure 4 It is a schematic diagram of the device body of the present invention.

[0016] Description of reference numerals: 1. Device body; 11. Sealing groove; 12. Circular groove; 13. Bolt hole 1; 14. Sample fixing position; 2. Cover plate; 21. Bolt hole 2; 3. Fixing assembly; 31. Screw; 32. Gasket; 33. Elastic washer; 34. Nut; 4. Sealing ring; 5. Filter membrane assembly; 51. Support plate; 52. Polymer filter membrane. DETAILED DESCRIPTION

[0017] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings. The same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. Unless otherwise specified, the raw materials and equipment used are commercially available or commonly used in the art. The methods in the embodiments, unless otherwise specified, are conventional methods in the art. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0018] See also Figures 1 to 4 , deep-sea environment microbial corrosion risk assessment test device, including: The device body 1 is cylindrical, and the inner wall is provided with an annular protrusion along the circumference to form a sample fixing position 14, and an axial tie hole is provided on the annular protrusion to facilitate the bundling and installation of the sample material; circular grooves 12 are provided along the circumference of the inner opening of the two ends of the device body 1, and the depth of the circular groove 12 is equal to the thickness of the support plate 51, and the diameter of the circular groove 12 is equal to the diameter of the circular support plate 51, and the porous plate-shaped support plates 51 are respectively embedded in the circular grooves 12; the outer side of the support plate 51 is covered with a polymer filter membrane 52, and the filter membrane completely covers the support plate 51; a cover plate 2 is provided on the outer side of the polymer filter membrane 52, and the cover plates 2 at both ends cooperate with the device body 1 to clamp the support plate 51 and the polymer filter membrane 52, and the support plate 51 and the polymer filter membrane 52 constitute a filter membrane assembly 5.

[0019] The device body 1 is provided with a plurality of axial bolt holes 13 evenly distributed around the circumference, and the cover plate 2 is provided with corresponding bolt holes 21. The cover plate 2 and the device body 1 are connected by a fixing assembly 3. The fixing assembly 3 includes screws 31, gaskets 32, elastic washers 33, and nuts 34. The cover plates 2 at both ends are fastened to the device body 1 by bolts.

[0020] The polymer filter membrane 52 is made of polytetrafluoroethylene (PTFE), with a pore size of ≤0.22 μm. The main body and cover 2 are made of polypropylene (PP, density 0.92 g / cm An annular sealing groove 11 is provided along the circumference of the end of the device body 1. The sealing groove 11 is located on the outer circumference of the circular groove 12. A sealing ring 4 is provided in the sealing groove 11. The depth of the sealing groove 11 is 0.5-0.9 times the cross-sectional diameter of the sealing ring 4 to ensure that the filter membrane is firmly pressed when the cover plate 2 is closed.

[0021] Deep sea environment microbial corrosion risk assessment test device, use steps: After disassembling the device, secure the test sample to the sample fixing position 14 in the test area of the device body 1 using a cable tie; Install the sealing ring 4 into the sealing groove 11 of the device body 1; Place the support plate 51 in the circular groove 12 of the device body 1, and then cover the polymer filter membrane 52 on the support plate 51, and ensure that its edge part exceeds the sealing range of the sealing ring 4; Align the device body 1 with the two side covers 2, so that the second bolt hole 21 on the cover 2 is completely aligned with the first bolt hole 13 on the device body 1. Use bolts, gaskets 32, elastic washers 33, and nuts 34 to complete the fastening connection between the device body 1 and the two side covers 2 to ensure the sealing and stability of the entire device; The assembled experimental and control devices were placed at a deep-sea test location according to a pre-determined plan. As the device continued to sink to the target test location, the support plate 51 and polymer filter membrane 52 gradually established a stable seawater corrosion environment in the core test area. Corrosion testing of the metal materials was conducted according to pre-determined test requirements. After the test, the experimental and control groups were retrieved, the test samples were disassembled, and detailed data was recorded to provide an accurate basis for subsequent research and evaluation.

[0022] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the above embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. Microbial corrosion risk assessment test device for deep sea environment, characterized by: include: The device body is cylindrical, and the cavity inside the cylinder is provided with a sample fixing position; The support plate is in the shape of a porous plate, and the two support plates are detachably arranged at the ends of the device body; The polymer filter membrane is arranged on the outside of the support plate and completely covers the support plate; The two cover plates are detachably mounted at both ends of the device body, and cooperate with the device body to clamp the support plate and the polymer filter membrane.

2. The microbial corrosion risk assessment test device for deep sea environment according to claim 1, characterized in that: A circular groove is provided along the circumference of the inner opening of the end portion of the device body, and the depth of the circular groove is equal to the thickness of the support plate.

3. The microbial corrosion risk assessment test device for deep sea environment according to claim 2, characterized in that: An annular sealing groove is provided along the circumference of the end portion of the device body. The sealing groove is located on the outer circumference of the circular groove, and a sealing ring is arranged in the sealing groove.

4. The microbial corrosion risk assessment test device for deep sea environment according to claim 1, characterized in that: The polymer filter membrane is made of at least one of nylon, cellulose, polycarbonate, polytetrafluoroethylene, polyvinylidene fluoride, and polyethersulfone, and has a cutoff pore size of ≤0.22 μm.

5. The microbial corrosion risk assessment test device for deep sea environment according to claim 1, characterized in that: The device body and cover are made of acrylonitrile butadiene styrene copolymer or polypropylene.

6. The microbial corrosion risk assessment test device for deep sea environment according to claim 1, characterized in that: The device body is provided with a plurality of axial bolt holes 1 evenly distributed around the circumference, and the cover plate is provided with corresponding bolt holes 2. The cover plates at both ends are fastened to the device body by bolts, gaskets, elastic washers and nuts.

7. The microbial corrosion risk assessment test device for deep sea environment according to claim 6, characterized in that: The supporting layer, screws, washers, spring washers and nuts are made of Hastelloy or titanium alloy.

8. The microbial corrosion risk assessment test device for deep sea environment according to claim 1, characterized in that: The sample fixing position is an annular protrusion arranged along the circumferential direction on the inner wall of the device body, and an axial tie hole is opened on the annular protrusion.

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