CN116482004A - Microorganism corrosion electrochemical test device under stress coupling effect - Google Patents

Microorganism corrosion electrochemical test device under stress coupling effect Download PDF

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Publication number
CN116482004A
CN116482004A CN202210045615.0A CN202210045615A CN116482004A CN 116482004 A CN116482004 A CN 116482004A CN 202210045615 A CN202210045615 A CN 202210045615A CN 116482004 A CN116482004 A CN 116482004A
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China
Prior art keywords
loading
opening
test device
reaction tank
module
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CN202210045615.0A
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Chinese (zh)
Inventor
李世瀚
王晓霖
赵巍
李明
石磊
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Sinopec Dalian Petrochemical Research Institute Co ltd
China Petroleum and Chemical Corp
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China Petroleum and Chemical Corp
Sinopec Dalian Research Institute of Petroleum and Petrochemicals
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Priority to CN202210045615.0A priority Critical patent/CN116482004A/en
Publication of CN116482004A publication Critical patent/CN116482004A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • G01N17/04—Corrosion probes
    • G01N17/043—Coupons
    • G01N17/046—Means for supporting or introducing coupons
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/04—Chucks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/56—Investigating resistance to wear or abrasion
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/0222—Temperature
    • G01N2203/0226—High temperature; Heating means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

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  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Analytical Chemistry (AREA)
  • Pathology (AREA)
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  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
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  • General Health & Medical Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Environmental Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)

Abstract

The invention discloses an electrochemical test device for microbial corrosion under the stress coupling effect. The device comprises a corrosion reaction tank and a bending loading clamp; the corrosion reaction tank is in an inverted concave shape, the side wall of the reaction tank is provided with a hole, a gasket is arranged at the hole, and the middle of the gasket is provided with a hole; the bending loading clamp is fixed at the opening; the bending loading clamp comprises a loading bracket, a loading rod and a loading module which is positioned in the loading bracket and can horizontally move; at least one pair of rollers are fixed on the inner sides of the supporting legs of the loading support, and one or more grooves and rollers which can be accommodated in the grooves are formed on the opposite end surfaces of the loading module and the opening. The testing device can ensure the accuracy of data and has the advantages of convenient disassembly, simple design and small volume.

Description

Microorganism corrosion electrochemical test device under stress coupling effect
Technical Field
The invention relates to an electrochemical testing device for metal material microbial corrosion, in particular to a device capable of testing corrosion resistance of a sample under the combined action of bending stress and a microbial corrosion environment.
Background
The acid oil field contains a large amount of H 2 S、CO 2 The corrosion problems of the surface gathering pipeline system are serious due to the corrosive medium. In addition, the gathering and transporting pipelines of many domestic oil and gas fields are also subjected to serious microbial corrosion (Microbiologically Influenced Corrosion, MIC) hazards, and accidents such as leakage, explosion and the like are caused by the failure of the gathering and transporting pipelines caused by corrosion perforation. Among various microbial communities existing in the oil-gas gathering and transporting system, the most harmful sulfate reducing bacteria (Sulfate Reducing Bacteria, SRB) are the most abundant, and in the production of the American oil well, the corrosion caused by the sulfate reducing bacteria reaches more than 77%, and the corrosion rate of steel can be increased by about 15 times under the synergistic effect of the sulfate reducing bacteria.
In the service process of the pipeline, besides being damaged by corrosive media and microorganisms, the stress effect also has an important influence on the safe operation of the pipeline. Particularly, when the pipeline is locally bent and deformed, the pipeline becomes a weak link for safe operation, and is easy to corrode and damage. Thus, it is important to study the effect of stress and microorganism interaction in corrosive media on metal corrosion behavior. However, the current electrochemical corrosion testing device rarely can measure the corrosion resistance of a sample under the combined action of stress and microorganisms of a corrosion-containing medium. In addition, the pipeline has different stress conditions in different circumferential directions, the deposition and adhesion characteristics of microorganisms in different positions of the pipeline are different, and the research on the corrosion characteristics under the combined action of stress and microorganisms in different positions of the pipeline is also necessary.
For example, publication No. CN107727564- "electrochemical test device for metal microbial corrosion in a flowing system" is a device for performing real-time electrochemical measurement of microbial corrosion of a metal material in a flowing system by aggregating and growing microorganisms on a metal surface; CN 109507263-corrosion test system for microorganism to grounding metal material, discloses a test system for corrosion test of microorganism to grounding metal material; CN 104458559-stress-electrochemical corrosion testing device, which is to use a weight to provide constant tension to study stress corrosion conditions when anaerobic bacteria exist at different temperatures; CN 102590298-method for testing microbial corrosion resistance of antibacterial stainless steel by electrochemical means, specifically describes a method for testing microbial corrosion resistance of antibacterial stainless steel by electrochemical means. In addition, the existing testing device method has a plurality of limitations: inconvenient disassembly and multiple measurements; the working area of the sample is treated in a manual sealing mode, the working area is inaccurate, and the parallelism is poor; the device has complex design, large volume and difficult carrying.
Disclosure of Invention
The invention provides a microorganism corrosion electrochemical test device under the action of corrosive medium and bending stress, which aims to overcome the defects that the conventional microorganism corrosion test device cannot simultaneously couple the bending stress action under the corrosive medium, cannot simulate and study the coupling corrosion action of pipelines in different directions, has complex device design, inaccurate working area of a sample and is not easy to disassemble. The device can realize the test of the microbial corrosion performance of the sample under the action of bending stress, can simulate and research the corrosion conditions of the bottom and side positions at the same time, and has the advantages of simple structure, definite working area of the sample and easy carrying and disassembly.
The technical scheme adopted by the invention is as follows:
an electrochemical test device for microbial corrosion under the stress coupling effect comprises an electrochemical workstation, a bending loading clamp a, a corrosion reaction tank and an incubator; the corrosion reaction tank is in an inverted concave shape, and the bending loading clamp a is fixed on the side wall (vertically arranged) of the corrosion reaction tank;
the side wall of the corrosion reaction tank is provided with an opening, a sealing insulating soft gasket is arranged at the opening, the middle of the sealing insulating soft gasket is provided with an opening, and the shape and the size of the sealing insulating soft gasket are matched with or consistent with those of the opening area of the corrosion reaction tank;
the bending loading fixture a comprises a loading bracket a, a loading rod a and a loading module a which is positioned in the loading bracket a and can move left and right; wherein, the liquid crystal display device comprises a liquid crystal display device,
-the loading support a is hollow and is open at one side facing the reaction tank; the two opposite sides of the opening are provided with supporting legs a protruding inwards and oppositely, and the inner side end surfaces of the supporting legs a (namely the end surfaces far away from the holes of the reaction tank) are fixed with at least one pair of symmetrically arranged rolling shafts a;
at least one or a plurality of symmetrically arranged grooves a are formed in the end face, opposite to the opening, of the loading module a, and each groove a comprises a roller a which can be accommodated in the groove a;
the loading module a is connected with the loading rod a, and the loading module a can only move horizontally (without up-and-down displacement) along with the action of the loading rod a.
Further, the loading rod a can drive the loading module a to move leftwards or rightwards when rotating.
Further, the loading bracket a is fixed on the side wall (the end face perpendicular to the surface of the concave opening) of the reaction tank through at least one pair of fastening bolts a and fastening nuts a.
Further, the loading rod a and the loading module a are connected through threads, and the loading rod a penetrates through the loading support a (right end face). In this case, the loading rod a is rotatable only, and no relative (left-right) displacement with respect to the loading bracket a is generated. Or, one side end of the loading rod a is connected to the loading bracket a through threads, the other end (left end) of the loading rod a is fixedly connected with the loading module a, and the loading rod a can rotate in the loading module a but does not generate left-right displacement relative to the loading module a. Wherein the threaded connection is of conventional construction in the art.
Further, the loading module a may have an internal hollow structure.
Further, the openings of the sealing and insulating soft gasket are matched with the openings of the side plane area, which means that the opening areas of the openings are basically equal or not different.
Further, the length of the rollers a arranged on the supporting legs of the loading support a should be greater than or equal to the width of the test sample, and the distance between the rollers on the supporting legs should be smaller than the length of the test sample. The support leg at one side of the loading support a can be of an integral continuous structure or of a hollow structure in the middle.
Further, the number of the rollers a (grooves a) provided on the loading module a is more than one, preferably more than two. For more than two rollers a (grooves a), the spacing between the outermost pair of rollers a (grooves a) should be smaller than the spacing between the grooves a (rollers a) on the loading ledges. The loading fixture can realize four-point bending, three-point bending, U-shaped bending and other different bending deformation and stress loading of the sample through the rolling shafts arranged on the supporting legs of the loading support and the grooves and the rolling shafts on the loading module.
Further, a to-be-tested sample is placed between the loading module a and the rolling shaft on the supporting leg of the loading support a. After placing the test sample, one or a pair of rollers are inserted into the appropriate grooves on the loading module as required.
Further, the roller a may be made of a material having a certain rigidity and being not easily deformed, such as glass or ceramic. The roller a is preferably of cylindrical configuration.
Further, the corrosion reaction tank is in an inverted concave shape, and a bending loading clamp b is fixedly arranged on the upper surface (end surface) of the inverted concave opening; meanwhile, the upper surface of the inverted-concave-shaped opening is provided with an opening, and the opening has the same horizontal height as the opening of the side wall of the reaction tank; a sealing insulating soft gasket is arranged at the opening, the middle of the sealing insulating soft gasket is provided with an opening, and the shape and the size of the sealing insulating soft gasket are matched with those of the opening area of the corrosion reaction tank;
the bending loading clamp b comprises a loading bracket b, a loading rod b and a loading module b which is positioned in the loading bracket b and can move up and down; wherein, the liquid crystal display device comprises a liquid crystal display device,
-the loading bracket b is hollow in the interior and is open in the upper part; the opposite sides of the upper opening are provided with inward opposite protruding support legs b, and the inner side end surfaces of the support legs b (namely the end surfaces far away from the openings of the reaction tanks) are fixedly provided with at least one pair of symmetrically arranged rolling shafts b;
at least one or a plurality of symmetrically arranged grooves b are formed in the end face, opposite to the opening, of the loading module b, and each groove b comprises a roller b which can be accommodated in the groove b;
the loading module b is connected with the loading rod b, and the loading module b can only move up and down (without horizontal displacement) along with the action of the loading rod b.
Further, the loading rod b can drive the loading module to move upwards or downwards when rotating.
Further, the loading bracket b is fixed on the plane of the inverted-concave-shaped opening of the reaction tank through at least one pair of fastening bolts b and fastening nuts b.
Further, the loading rod b and the loading module b are connected through threads, and the loading rod b penetrates through the loading support b (lower end face). In this case, the loading rod b is rotatable only, and no relative (up-down) displacement with respect to the loading bracket b is generated. Or the lower end (lower part) of the loading rod b is connected to the loading bracket b through threads, the upper end of the loading rod b is fixedly connected with the loading module b, and the loading rod b can rotate in the loading module b but does not generate up-and-down displacement relative to the loading module. Wherein the threaded connection is of conventional construction in the art.
Further, the loading module b may have an internal hollow structure.
Further, the openings of the sealing insulating soft gasket are matched with the openings of the concave plane area, which means that the opening areas of the openings of the sealing insulating soft gasket and the concave plane area are not much different.
Further, the length of the rollers b provided on the legs of the loading support b should be greater than or equal to the width of the test specimen, and the spacing of the rollers on the legs should be less than the length of the test specimen. The support leg at one side of the loading support can be of an integral continuous structure or of a hollow structure in the middle.
Further, the number of the rollers b (grooves b) provided on the loading module b is one or more, preferably two or more. For more than two rollers b (grooves b), the spacing between the outermost pair of rollers b (grooves b) should be smaller than the spacing between the grooves b (rollers b) on the loading ledges. Through the roller shafts arranged on the supporting legs of the loading support, the grooves and the roller shafts on the loading modules, the loading clamp b can realize four-point bending, three-point bending, U-shaped bending and other different bending deformation and stress loading of the sample.
Further, a to-be-tested sample is placed between the loading module b and the rolling shaft on the supporting leg of the loading support b. After placing the test sample, one or a pair of rollers are inserted into the appropriate grooves on the loading module as required.
Further, the roller b may be made of a material having a certain rigidity and being not easily deformed, such as glass or ceramic. The roller is preferably of cylindrical configuration.
Further, the upper end face of the corrosion reaction tank is provided with at least four openings, and more than four openings are preferably arranged at intervals on the upper end face. The two openings are respectively provided with a salt bridge and a platinum sheet, and the salt bridge is connected with a reference electrode. The salt bridge and the platinum sheet should be immersed in the reaction solution of the reaction tank. The salt bridge, the platinum sheet and the upper end face of the reaction tank are fixed in a sealing way. The other group of openings can be an air inlet, an air outlet, a dosing hole and a sampling port respectively, wherein the air inlet (dosing port) is used for introducing gases such as nitrogen, hydrogen sulfide, carbon dioxide and the like or filling liquid medicine into the corrosion reaction tank, and the air outlet (sampling port) is used for discharging gases or sampling.
Further, the salt bridge and the platinum sheet should be disposed near the middle opening of the loading sample and the reaction cell. The lower ends of the salt bridge and the platinum sheet are at the same level with the openings on the plane of the inverted concave opening of the reaction tank and the openings on the side surface.
Further, the sealing insulating soft gasket can be made of materials with good elasticity such as silicon rubber, polyolefin and the like and waterproof.
Further, the openings of the corrosion reaction tank and the sealing insulating soft gasket are square or round, and the contact area of the sample and the reaction solution can be conveniently determined.
Further, the electrochemical workstation comprises an auxiliary electrode interface, a working electrode interface and a reference electrode interface. The platinum sheet is connected to an auxiliary electrode interface of the workstation, the loading sample in the clamp is connected to a working electrode interface of the workstation, and the reference electrode is connected to a reference electrode interface of the workstation.
Further, the incubator is used for accommodating the corrosion reaction tank and ensuring the constant temperature of the test environment so as to study the corrosion effect of microorganisms on the sample at different temperatures. The side wall of the incubator is provided with small holes for connecting pipelines which are needed to be accessed on the corrosion reaction tank during testing with external equipment of the incubator. The salt bridge is connected with the reference electrode, and the platinum sheet, the sample in the loading clamp and the reference electrode are respectively connected to each electrode interface of the electrochemical workstation.
Furthermore, various solution media such as potassium chloride, hydrochloric acid and the like can be contained in the corrosion reaction tank according to test requirements.
In the invention, the sample is bent, loaded and deformed in the clamp, and the clamp is respectively fixed on the plane and the side surface (the end surface perpendicular to the surface of the concave opening) of the inverted concave opening at the lower part of the corrosion reaction tank by the fixer, so that the sample in the clamp is tightly contacted with the soft cushion piece of the corrosion reaction tank, and the loading stress of the sample is ensured to be constant.
The culture solution inoculated with specific bacteria can be added into the corrosion reaction tank according to the test requirement.
The gas inlet can be filled with nitrogen, hydrogen sulfide, carbon dioxide and other gases.
The bactericide of specific bacteria can be put into the dosing holes.
The invention also provides an electrochemical test method for microbial corrosion under the stress coupling effect, wherein the test device is applied.
Compared with the prior art, the test device has the following beneficial effects:
1. the invention can respectively study and compare the effect of stress with different magnitudes applied in the horizontal direction and the vertical direction on microbial corrosion. In addition, through setting up the mounting fixture loading sample respectively at the surface (terminal surface) and the side of the reverse "concave" font opening of corrosion reaction pond (the terminal surface perpendicular to the surface of "concave" font opening), can simulate and research the effect difference of microorganism on the same horizontal height different direction plane under the stress. Meanwhile, the characteristics and differences of microbial corrosion under the stress coupling effect in different circumferential directions can be studied by changing the fixing positions of the side clamps.
2. According to the invention, the bolt structures are introduced into the corrosion reaction tank and the loading clamp, so that the loading clamp is fixed at the corresponding position of the corrosion reaction tank through the fixing and fastening bolts, the loading clamp is convenient to load on the reaction tank and fixedly place the corrosion reaction tank, the stress of the sample after the sample is contacted with the gasket is unchanged and stable, and the load value applied to the sample can be more accurately determined. The loading mode can be manual mechanical loading, or electromechanical loading can be performed by introducing a motor, a stress sensor and the like.
3. Through the recess that sets up on loading support lower part stabilizer blade, the roller bearing that sets up in the recess to and the recess and the roller bearing that can insert of loading module lower terminal surface, in addition this roller bearing adopts insulating material to make, can ensure that loading module can exert bending stress to the sample, simultaneously with sample direct contact again, thereby guaranteed test data's accuracy.
4. Aiming at the defects of the prior art, the invention provides an electrochemical evaluation device for microbial corrosion under bending stress, which overcomes the defects of the prior art. Meanwhile, when the testing device is used, waterproof sealing treatment is not needed in the process of assembling the sample, manual sealing treatment is not needed each time for the working area of the sample, and meanwhile, the working area is accurate and the parallelism is high. In addition, the device of the invention has the advantages of convenient disassembly, easy carrying, simple design and small volume.
Drawings
FIG. 1 is a front cross-sectional view of an electrochemical test device for microbial corrosion under stress coupling according to the present invention.
FIG. 2 is a left side view of the corrosion reaction cell in the apparatus of the present invention.
FIG. 3 is a top view of the corrosion reaction cell in the apparatus of the present invention.
Fig. 4 is a structural view of the bending loading jig a.
Fig. 5 is a structural view of the bending loading jig b.
In fig. 1-5, each numerical designation corresponds to:
100-electrochemical workstation a, 200-incubator, 300-first loading clamp, 400-corrosion reaction tank, 500-second loading clamp, 600-electrochemical workstation b;
30-spacer a, 31-fastening bolt a, 32-fastening nut a, 33-leg a, 34-groove a, 35-loading screw a, 36-loading bracket a, 37-loading module a, 38-roller a, 39-sample a;
50-gaskets b, 51-fastening bolts b, 52-fastening nuts b, 53-support legs b, 54-grooves b, 55-loading screws b, 56-loading brackets b, 57-loading modules b, 58-rollers b, 59-samples b;
41-reference electrode, 42-salt bridge, 43-platinum sheet, 44-side opening of corrosion reaction tank, 45-bottom opening of corrosion reaction tank, 46-air inlet/drug adding hole, 47-air outlet, 48-reference electrode interface and 49-auxiliary electrode interface.
Detailed Description
For the purpose of making the objects, technical solutions and features of the present invention more clear, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be noted that the described embodiments are only some embodiments of the present invention, and other embodiments obtained by those skilled in the art without making any creative effort based on the embodiments of the present invention are all within the protection scope of the present invention.
As shown in fig. 1, 2 and 3, the stress coupling microorganism corrosion electrochemical test apparatus of the present invention comprises an electrochemical workstation a100, a thermostat 200, a corrosion reaction cell 400, and a bending loading jig a 300. The corrosion reaction tank 400 is in an inverted concave shape, the right side wall is provided with an opening 44, the opening 44 is covered by the bending loading clamp a300, and the corrosion reaction tank is fixedly arranged on the right side wall. The opening 44 is provided with a sealing insulating gasket 30, the middle opening of the sealing insulating gasket 30 is provided with a shape and a size matched with the opening 44 of the corrosion reaction tank. The fastening nuts a32 pass through the corresponding openings on the side surface of the corrosion reaction tank 400, and the loading brackets a36 of the bending loading clamp a are fixed on the side wall of the reaction tank through the fastening bolts a 31.
The bending loading jig a300 includes a loading bracket a36, a loading screw a35, and a loading module a37 located inside the loading bracket and movable left and right. The loading bracket a36 is hollow and open at the left; the opposite sides of the left opening are provided with inward opposite protruding support legs a33, and the inner end surfaces of the support legs a33 (namely the end surfaces far away from the openings of the reaction tank) are fixed with at least one pair of symmetrically arranged rolling shafts a38. The end of the loading module opposite the opening is provided with at least one or a plurality of symmetrically arranged grooves a34 which comprise rollers a38 receivable therein. The loading module a37 and the loading screw a35 can be connected through threads, and the loading module a37 can only move left and right (without up and down displacement) along with the action of the loading screw a 35. Preferably, the loading module a37 is driven to move leftwards or rightwards when the loading screw a35 rotates. The specimen a39 is held in the loading stand a36 by a cylindrical roller a38 placed in the recess. An opening gasket a30 is arranged between the sample a39 and the corrosion reaction tank 400, an opening is arranged in the middle of the opening gasket a30, and the middle stress part of the sample a39 is contacted with the corrosion solution in the corrosion reaction tank 400 through the opening. The loading module a37 of the jig is moved in the direction of the opening of the corrosion reaction cell 400 by rotating the loading screw a35, and the sample a39 is loaded.
In a preferred embodiment of the present invention, the electrochemical test device further comprises a bending loading jig b500. The upper surface of the concave notch of the corrosion reaction tank is provided with an opening 45, the opening 45 is correspondingly provided with a sealing insulation soft gasket b50, and a bending loading clamp b500 is covered on the opening 45 for installation. And the middle opening of the insulating soft gasket is sealed, and the shape and the size of the middle opening are matched with those of the corrosion reaction tank. The fastening nut b52 is passed through the bottom of the etching reaction tank 400, and the loading bracket b56 of the bending loading clamp b500 is fixed at the middle bottom of the etching reaction tank 400 by the fastening bolt b 51 and the fastening nut b 52.
The bending loading jig b500 includes a loading bracket b56, a loading screw b55, and a loading module b57 located inside the loading bracket and movable up and down. The loading bracket b56 is hollow in the interior and is open in the upper part; the opposite sides of the upper opening are provided with inwardly and oppositely protruding support legs b 53, and the inner end surfaces of the support legs b 53 (namely the end surfaces far away from the openings of the reaction tank) are fixedly provided with at least one pair of symmetrically arranged rolling shafts b 58. The end face of the loading module opposite to the opening is provided with at least one or a plurality of symmetrically arranged grooves b 54 which comprise rollers b 58 accommodated therein. The loading module b57 and the loading screw b55 can be connected through threads, and the loading module b57 can only move up and down (without horizontal displacement) along with the action of the loading screw b 55. Preferably, the loading module b57 is driven to move up or down when the loading screw b55 rotates. The specimen b59 is held in the loading stand b56 by a cylindrical roller b 58 placed in the recess. An opening gasket b50 is arranged between the sample b59 and the corrosion reaction tank 400, an opening is arranged in the middle of the opening gasket b50, and the middle stress part of the sample b59 is contacted with the corrosion solution in the corrosion reaction tank 400 through the opening. The loading module b57 of the jig is moved in the direction of the opening of the corrosion reaction cell 400 by rotating the loading screw b55, and the sample b59 is loaded.
The upper part of the corrosion reaction tank 400 is provided with a plurality of holes, 46-air inlet/medicine adding holes, 47-air outlet, 48-reference electrode interface and 49-auxiliary electrode interface. Comprises an air inlet/dosing port 46 for introducing corrosive gases such as hydrogen sulfide, carbon dioxide and the like and adding a specific bactericide; the gas outlet 47 is used for discharging gas in the introduced solution, the reference electrode jack 48 is used for placing the salt bridge 41 and the reference electrode 42, the auxiliary electrode jack 49 is used for placing the platinum sheet 43, the salt bridge 41 and the platinum sheet 43 are placed close to the loading sample a39 and the loading sample b59, the reference electrode 42, the platinum sheet 43 and the loading sample a are respectively connected with the reference electrode interface, the auxiliary electrode interface and the working electrode interface in the electrochemical workstation 1, and the reference electrode 42, the platinum sheet 43 and the loading sample b are respectively connected with the reference electrode interface, the auxiliary electrode interface and the working electrode interface in the electrochemical workstation 600.
The same loading sample a and loading sample b are selected, namely, the conditions of controlling the materials, the sizes and the like of the two samples are the same. The mounting conditions of the sample on the two jigs are the same, and include the material and shape of the roller a38 and the roller b 58, the material and opening shape of the opening pad a30 and the opening pad b50, and the like. The same displacement is applied to the loading screw a35 and the loading screw b55, that is, the stress of the control sample a39 and the control sample b59 is the same. Under the state, the difference of corrosion behaviors of the specific metal sample on the stress condition with different plane orientations can be simulated and researched.
In the present invention, the reaction solution further includes a microorganism. The selected microorganism can be Sulfate Reducing Bacteria (SRB), and the culture of the strain adopts liquid culture medium and experimental conditions recommended by API. Since the pH of the SRB optimum growth environment is 7.0-7.5, the pH of the medium is adjusted to 7.2 using sodium hydroxide solution. Before use, the SRB medium was deoxygenated with nitrogen for 1h, and the medium was sealed in an autoclave at a high temperature of 121 ℃ +15psi for 20min. Bacteria were inoculated into the culture broth in an anaerobic glove box and placed in a38 ℃ biochemical incubator for enrichment culture. The culture solution was added to the corrosion reaction tank 400, and the corrosion reaction tank 400 was placed in the incubator 200 at 38℃at the time of the experiment. The open circuit potential, polarization curve, alternating current impedance (EIS) and other data results can be measured according to test requirements. After the test, the samples a39 and b59 are treated in time, including macroscopic photograph observation of the fixed corrosion products, scanning electron microscope observation of the metal spraying treatment, surface bacteria concentration measurement, pitting corrosion and depth measurement of the samples a39 and b59, and the like. And by combining the test results, the corrosion characteristics and differences of the samples under the coupling action of the microbial stress in different directions can be compared.

Claims (20)

1. An electrochemical test device for microbial corrosion under the stress coupling effect comprises an electrochemical workstation, a bending loading clamp a, a corrosion reaction tank and an incubator;
the corrosion reaction tank is in an inverted concave shape, and the bending loading clamp a is fixed on the side wall of the corrosion reaction tank;
the side wall of the corrosion reaction tank is provided with an opening, a sealing insulating soft gasket is arranged at the opening, the middle of the sealing insulating soft gasket is provided with an opening, and the shape and the size of the sealing insulating soft gasket are matched with or consistent with those of the opening area of the corrosion reaction tank;
the bending loading fixture a comprises a loading bracket a, a loading rod a and a loading module a which is positioned in the loading bracket a and can move left and right; wherein, the liquid crystal display device comprises a liquid crystal display device,
-the loading support a is hollow and is open at one side facing the reaction tank; the two opposite sides of the opening are provided with supporting legs a protruding inwards in opposite directions, and at least one pair of symmetrically arranged rolling shafts a are fixed on the inner side end surfaces of the supporting legs a;
at least one or a plurality of symmetrically arranged grooves a are formed in the end face, opposite to the opening, of the loading module a, and each groove a comprises a roller a which can be accommodated in the groove a;
the loading module a is connected with the loading rod a, and the loading module a can only move horizontally along with the action of the loading rod a.
2. The test device according to claim 1, wherein the loading bracket a is fixed to the side wall of the reaction tank by at least one pair of fastening bolts a and fastening nuts a.
3. The test device according to claim 1, wherein a threaded connection is adopted between the loading rod a and the loading module a, and the loading rod a penetrates through the loading bracket a; or, one side end of the loading rod a is connected to the loading bracket a through threads, the other end of the loading rod a is fixedly connected with the loading module a, and the loading rod a can rotate in the loading module a but does not generate left-right displacement relative to the loading module a.
4. The test device of claim 1, wherein the loading module a is hollow in the interior.
5. The test device according to claim 1, wherein the length of the rollers a provided on the legs of the loading support a is greater than or equal to the width of the test specimen, and the spacing of the rollers on the legs is less than the length of the test specimen.
6. Test device according to claim 1, wherein the number of rollers a provided on the loading module a is more than one, preferably more than two.
7. The test device of claim 6, wherein for more than two rollers a, the spacing between the outermost pair of rollers a should be less than the spacing between the grooves a on the loading ledges.
8. The test device according to any one of claims 1-7, wherein a bending loading clamp b is fixedly arranged on the upper surface of the inverted-concave-shaped opening of the corrosion reaction tank; meanwhile, the upper surface of the inverted-concave-shaped opening is provided with an opening, and the opening has the same horizontal height as the opening of the side wall of the reaction tank; the sealing insulating soft gasket is arranged at the opening, the middle of the sealing insulating soft gasket is provided with an opening, and the shape and the size of the sealing insulating soft gasket are matched with those of the opening area of the corrosion reaction tank.
9. The test device according to claim 8, wherein the bending loading fixture b comprises a loading bracket b, a loading rod b and a loading module b which is positioned inside the loading bracket b and can move up and down; wherein, the liquid crystal display device comprises a liquid crystal display device,
the loading bracket b is hollow and has an open upper part; the opposite sides of the upper opening are provided with inward opposite protruding support legs b, and the inner side end surfaces of the support legs b are fixed with at least one pair of symmetrically arranged rolling shafts b;
at least one or a plurality of symmetrically arranged grooves b are formed in the end face, opposite to the open hole, of the loading module b, and each groove b comprises a roller b which can be accommodated in the groove b;
the loading module b is connected with the loading rod b, and the loading module b can only move up and down along with the action of the loading rod b.
10. The test device according to claim 8, wherein the loading bracket b is fixed on the plane of the inverted-concave opening of the reaction cell by at least one pair of fastening bolts b and fastening nuts b.
11. The test device of claim 8, wherein a threaded connection is adopted between the loading rod b and the loading module b, and the loading rod b penetrates through the loading bracket b; or the lower part of the loading rod b is connected to the loading bracket b through threads, the upper end of the loading rod b is fixedly connected with the loading module b, and the loading rod b can rotate in the loading module b without generating up-and-down displacement relative to the loading module.
12. The test device according to claim 8, wherein the length of the rollers b provided on the legs of the loading support b is greater than or equal to the width of the test specimen, and the spacing of the rollers on the legs is less than the length of the test specimen.
13. The test device according to claim 8, wherein the number of rollers b provided on the loading module b is more than one, preferably more than two.
14. The test device of claim 13, wherein the number of rollers b provided on the module b is more than two, and wherein the spacing between the outermost pair of rollers b is less than the spacing between the rollers b on the loading ledges.
15. The test device according to claim 1, wherein the upper end face of the corrosion reaction tank is provided with at least four openings, and more than four openings are arranged at intervals on the upper end face.
16. The test device of claim 15, wherein the two openings are provided with a salt bridge and a platinum sheet, respectively, the salt bridge being connected to a reference electrode; the other group of openings are respectively an air inlet/air outlet and a dosing hole/sampling port.
17. The test device of claim 16, wherein the salt bridge and the platinum sheet are disposed near the middle opening of the loading sample and the reaction cell; the lower ends of the salt bridge and the platinum sheet are at the same level with the openings on the reverse concave opening plane and the side surface of the reaction tank.
18. The test device of claim 1 or 8, wherein the openings of the corrosion reaction cell and the sealing insulating soft gasket are square or round.
19. The test device of claim 8, wherein the electrochemical workstation comprises an auxiliary electrode interface, a working electrode interface, and a reference electrode interface; the platinum sheet is connected to an auxiliary electrode interface of the workstation, the loading sample in the clamp is connected to a working electrode interface of the workstation, and the reference electrode is connected to a reference electrode interface of the workstation.
20. The test device of claim 8, wherein the incubator is configured to hold a corrosion reaction cell to ensure a constant temperature of the test environment.
CN202210045615.0A 2022-01-15 2022-01-15 Microorganism corrosion electrochemical test device under stress coupling effect Pending CN116482004A (en)

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