CN109060925B - Couple corrosion test device used in high-temperature high-pressure environment - Google Patents
Couple corrosion test device used in high-temperature high-pressure environment Download PDFInfo
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- CN109060925B CN109060925B CN201811033252.9A CN201811033252A CN109060925B CN 109060925 B CN109060925 B CN 109060925B CN 201811033252 A CN201811033252 A CN 201811033252A CN 109060925 B CN109060925 B CN 109060925B
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- 238000005260 corrosion Methods 0.000 title claims abstract description 86
- 230000007797 corrosion Effects 0.000 title claims abstract description 86
- 238000012360 testing method Methods 0.000 title claims abstract description 58
- 239000002184 metal Substances 0.000 claims abstract description 34
- 229910052751 metal Inorganic materials 0.000 claims abstract description 34
- 238000002955 isolation Methods 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims description 22
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 11
- 229910052802 copper Inorganic materials 0.000 claims description 11
- 239000010949 copper Substances 0.000 claims description 11
- 239000011810 insulating material Substances 0.000 claims description 6
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 125000006850 spacer group Chemical group 0.000 claims description 3
- 239000007769 metal material Substances 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 8
- 238000009434 installation Methods 0.000 abstract description 6
- 238000002848 electrochemical method Methods 0.000 abstract description 3
- 230000035945 sensitivity Effects 0.000 description 13
- 239000000463 material Substances 0.000 description 12
- 238000004088 simulation Methods 0.000 description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 241000227287 Elliottia pyroliflora Species 0.000 description 5
- 238000013461 design Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- 238000000840 electrochemical analysis Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229920001973 fluoroelastomer Polymers 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000012085 test solution Substances 0.000 description 1
- 238000012956 testing procedure Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
-
- 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
Abstract
The invention discloses a galvanic corrosion test device for a high-temperature and high-pressure environment, which comprises a sleeve-shaped connector, wherein the lower end of the connector is positioned in an outer back cap, at least two metal sleeves are sleeved on the outer wall of the lower end of the connector, an insulating isolation sleeve is arranged between two adjacent metal sleeves, a radial threaded hole and an axial threaded hole are formed in the metal sleeves, at least two strip-shaped through holes are formed in the wall surface of the lower end of the connector, a wire clamp is connected to the radial threaded hole of the metal sleeve, and the wire clamp is used for connecting a working electrode. The purpose of the device is to provide a galvanic corrosion test device for a high-temperature high-pressure environment, solve the problems that the existing test technology is poor in tightness and safety, and the test result is poor in accuracy and the experimental error is not easy to control due to the fact that the installation position of a three-electrode system is unstable, and realize the function of carrying out galvanic corrosion test on metal materials by using an electrochemical method and a weightlessness method under the working conditions of high temperature and high pressure.
Description
Technical Field
The invention belongs to the field of test instruments, relates to a galvanic corrosion sensitivity test of a metal material, and particularly relates to an electrode system device for evaluating galvanic corrosion sensitivity under a high-temperature and high-pressure environment.
Background
With the deep development of oil and gas fields at home and abroad, the service environments of underground pipe columns and ground oil and gas facilities are increasingly harsh, and corrosion failure problems frequently occur. Particularly, when metals of different materials are in contact with each other, if the electric potential difference is large, galvanic corrosion can occur, so that the metal material with low electric potential accelerates corrosion and fails. Therefore, in the material selection design, when two metals of different materials which are in contact, particularly carbon steel at high temperature and high pressure are in contact with stainless steel or nickel base alloy, the galvanic corrosion risk of the metals needs to be evaluated. When the galvanic corrosion sensitivity is evaluated, the galvanic corrosion characteristics of the metal material are tested by using an electrochemical method, and the method is an essential experimental method and means for researching the corrosion behavior and mechanism of the metal material, so that the electrode potential of the research electrode can be controlled and measured without being hindered by passing polarized current on the interface of the research electrode, and the control and measurement of the current and the potential can be realized simultaneously. At present, the galvanic corrosion test methods provided in the standards, documents and patents are generally only suitable for the normal-temperature and normal-pressure environment, and the introduction of the galvanic corrosion test methods under the high-temperature and high-pressure environment is relatively less. In order to meet the requirements of galvanic corrosion electrochemical tests and soaking corrosion simulation tests under severe environmental conditions, an electrode system device for evaluating galvanic corrosion sensitivity under high-temperature and high-pressure conditions is urgently needed.
Disclosure of Invention
The invention aims to solve the technical problems of poor tightness and safety, poor accuracy of a test result and difficult control of experimental errors caused by unstable installation positions of a three-electrode system in the prior art, and realize the function of performing galvanic corrosion test on metal materials by using an electrochemical method and a weightless method under the working conditions of high temperature and high pressure.
The invention discloses a galvanic corrosion test device for a high-temperature and high-pressure environment, which comprises a sleeve-shaped connector, wherein the lower end of the connector is positioned in an outer back cap made of an insulating material, the connector is fixedly and hermetically connected with the outer back cap, at least two metal sleeves are sleeved on the outer wall of the lower end of the connector, an insulating isolation sleeve is arranged between every two adjacent metal sleeves, radial threaded holes are formed in the outer wall of each metal sleeve, axial threaded holes are formed in the end face of each metal sleeve, at least two strip-shaped through holes are formed in the wall surface of the lower end of the connector, the number of the strip-shaped through holes is the same as that of the metal sleeves, the axial threaded holes in the metal sleeves are in one-to-one correspondence with the strip-shaped through holes, wire clamps are connected to the radial threaded holes of the metal sleeves, and pass through the outer back cap and are provided with sealing pieces between the wire clamps and the outer back cap, and the wire clamps are used for connecting working electrodes.
The invention relates to a galvanic corrosion test device used in a high-temperature and high-pressure environment, wherein the pipe wall thickness of the upper end of a joint is larger than that of the lower end of the joint, a first flange plate is arranged on the outer pipe wall of the upper end of the joint, a second flange plate is arranged at the opening of an outer back cap, and the joint and the outer back cap are connected through the first flange plate and the second flange plate through bolts.
The invention is used for a galvanic corrosion test device under a high-temperature and high-pressure environment, wherein two O-shaped sealing rings are arranged between the upper end of the joint and the outer back cap.
The invention relates to a galvanic corrosion test device used in a high-temperature high-pressure environment, wherein the number of the copper sleeves is three, and the number of the strip-shaped through holes is also three.
The invention is used for a galvanic corrosion test device under a high-temperature and high-pressure environment, wherein an inner back cap made of an insulating material is connected at the end head of the lower end of the joint in a threaded manner.
The invention is used for a galvanic corrosion test device under a high-temperature and high-pressure environment, wherein the end head of the wire clamp is connected with a fastening bolt, and the wire clamp is connected with a working electrode through the fastening bolt.
The invention is used for a galvanic corrosion test device under a high-temperature and high-pressure environment, wherein a sealing element between the wire clamp and the outer back cap is an O-shaped sealing ring.
The invention is used for a galvanic corrosion test device under a high-temperature and high-pressure environment, wherein the outer back cap, the insulating isolation sleeve and the inner back cap are made of polytetrafluoroethylene.
The galvanic corrosion test device for the high-temperature and high-pressure environment is different from the prior art in that the joint is connected with the high-temperature and high-pressure reaction vessel through the NPT screw thread, the conductive column is connected with the working electrode through the metal sleeve and the wire clamp, the test device is sealed through the related sealing ring, and the electric insulation between different working electrodes and between the working electrode and the reaction vessel is realized through the inner back cap, the outer back cap and the insulating isolation sleeve. The high-temperature high-pressure corrosion simulation experiment device is matched with a reaction container capable of meeting the working condition of high-temperature high-pressure corrosion simulation experiment, and can be used for developing high-temperature high-pressure corrosion simulation experiment. According to the invention, through designing the electric connection of the working electrode and the tightness of the experimental device, the design device can meet the basic requirements and tightness of the galvanic corrosion test under the high-temperature and high-pressure environment. Meanwhile, the testing means such as electrochemical testing, corrosion weightlessness and the like can be utilized to develop the metal material galvanic corrosion sensitivity evaluation test. The test device has the advantages of convenience in installation, good sealing performance and true and reliable experimental results.
The invention is further described below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of an assembly of a galvanic corrosion test apparatus for use in a high temperature and high pressure environment with a high temperature and high pressure reaction vessel according to the present invention;
FIG. 2 is a schematic structural diagram of the galvanic corrosion test apparatus for use in high temperature and high pressure environments of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a perspective view of the galvanic corrosion test device of the invention for use in high temperature and high pressure environments;
FIG. 5 is a schematic view of a joint according to the present invention;
FIG. 6 is a cross-sectional view taken along line B-B of FIG. 5;
FIG. 7 is a perspective view of a joint according to the present invention;
FIG. 8 is a schematic view of the structure of the outer back cap of the present invention;
FIG. 9 is a cross-sectional view taken along line C-C of FIG. 8;
FIG. 10 is a perspective view of the outer back cap of the present invention;
FIG. 11 is a perspective view of a metal sleeve according to the present invention;
FIG. 12 is a schematic view of an insulating spacer according to the present invention;
FIG. 13 is a cross-sectional view taken along line D-D of FIG. 12;
fig. 14 is a perspective view of an insulating spacer according to the present invention;
fig. 15 is a schematic structural view of a wire clip according to the present invention.
Detailed Description
As shown in fig. 2 and combined with fig. 3-11, the galvanic corrosion test device for the high-temperature and high-pressure environment comprises a sleeve-shaped connector 2, wherein the lower end of the connector 2 is positioned in an outer back cap 10 made of an insulating material, the connector 2 is fixedly and hermetically connected with the outer back cap 10, at least two metal sleeves 6 are sleeved on the outer wall of the lower end of the connector 2, an insulating isolation sleeve 8 is arranged between every two adjacent metal sleeves 6, radial threaded holes are formed in the outer wall of each metal sleeve 6, axial threaded holes are formed in the end face of each metal sleeve 6, at least two strip-shaped through holes are formed in the wall surface of the lower end of the connector 2, the number of the strip-shaped through holes is the same as that of the metal sleeves 6, the axial threaded holes in the metal sleeves 6 are in one-to-one correspondence with the strip-shaped through holes, wire clamps 5 are connected to the radial threaded holes in the metal sleeves 6, and the wire clamps 5 penetrate through the outer back cap 10 and are provided with sealing pieces between the outer back caps 10.
The outer back cap 10 is cylindrical, the bottom of the outer back cap 10 is provided with a bottom wall, and the upper end of the outer back cap 10 is provided with an opening.
The invention is used for a galvanic corrosion test device under a high-temperature and high-pressure environment, wherein the pipe wall thickness of the upper end of a joint 2 is larger than that of the lower end, a first flange is arranged on the outer pipe wall of the upper end of the joint 2, a second flange is arranged at the opening of an outer back cap 10, and the joint 2 and the outer back cap 10 are connected through the first flange and the second flange through bolts. The stability is enhanced by the connection of the fastening bolts 4.
The invention is used for a galvanic corrosion test device under a high-temperature and high-pressure environment, wherein two O-shaped sealing rings 3 are arranged between the upper end of the joint 2 and the outer back cap 10.
The invention is used for a galvanic corrosion test device under a high-temperature and high-pressure environment, wherein the metal sleeve 6 is a copper sleeve, the number of the copper sleeves is three, and the number of the strip-shaped through holes is also three.
The invention is used for a galvanic corrosion test device under a high-temperature and high-pressure environment, wherein an inner back cap 9 made of an insulating material is connected at the end of the lower end of the joint 2 in a threaded manner. As shown in fig. 12, and in combination with fig. 13 and 14, the inner back cap 9 is sleeve-shaped, the inner wall of the inner back cap 9 is provided with threads, and the outer wall of the outer back cap is provided with a radial boss for supporting and fixing the metal sleeve 6.
As shown in fig. 15, the wire clamp 5 has a strip structure, the end of the wire clamp 5 is connected with a fastening bolt 4, and the wire clamp 5 is connected with a working electrode through the fastening bolt 4. In this embodiment, the wire clip is a long cylinder, but may be other shapes, such as a strip structure with a square, rectangular or oval cross section.
The invention is used for a galvanic corrosion test device under a high-temperature and high-pressure environment, wherein a sealing piece between the wire clamp 5 and the outer back cap 10 is an O-shaped sealing ring 3.
The invention is used for a galvanic corrosion test device under a high-temperature and high-pressure environment, wherein the outer back cap 10, the insulating isolation sleeve 8 and the inner back cap 9 are made of polytetrafluoroethylene.
The connector 2 is connected with a high-temperature high-pressure reaction vessel through NPT threads, the conductive column 1 is connected with a working electrode through a metal sleeve 6 and a wire clamp 5, the experimental device is sealed through a related sealing ring, and electric insulation between different working electrodes and between the working electrode and the reaction vessel is realized through an inner back cap 10, an outer back cap 10 and an insulating isolation sleeve 8. The high-temperature high-pressure corrosion simulation experiment device is matched with a reaction container capable of meeting the working condition of high-temperature high-pressure corrosion simulation experiment, and can be used for developing high-temperature high-pressure corrosion simulation experiment. According to the invention, through designing the electric connection of the working electrode and the tightness of the experimental device, the design device can meet the basic requirements and tightness of the galvanic corrosion test under the high-temperature and high-pressure environment. Meanwhile, the testing means such as electrochemical testing, corrosion weightlessness and the like can be utilized to develop the metal material galvanic corrosion sensitivity evaluation test. The test device has the advantages of convenience in installation, good sealing performance and true and reliable experimental results.
The invention provides an electrode system device for evaluating galvanic corrosion sensitivity in a high-temperature high-pressure environment. The invention is combined with a corresponding reaction container, can more accurately, efficiently and conveniently test and simulate the galvanic corrosion electrochemical behavior characteristics and weightlessness of the metal material under the high-temperature high-pressure actual working condition, reproduces the corrosion process, evaluates and analyzes the corrosion sensitivity problem, and provides constructive comments or suggestions for material selection and specific application in the future. The invention has high accuracy, high experimental efficiency, convenient experimental installation, and reliable safety, and most importantly, can meet the test under the conditions of high temperature and high pressure.
As shown in FIG. 1, the invention can be combined with a reaction vessel capable of meeting the working condition of high-temperature high-pressure experiment to develop a high-temperature high-pressure corrosion simulation experiment. The method can utilize various testing means such as electrochemical testing, corrosion weightlessness and the like to carry out evaluation research on galvanic corrosion sensitivity of the metal material, and carry out research and analysis on specific corrosion behavior and corrosion failure reasons, thereby providing reference for later material selection and application under actual working conditions.
As shown in FIG. 1, the metal material according to the invention should meet the corrosion resistance requirements of experimental conditions. As for CO-containing 2 In the environment, the metal material can be 316L material to meet the corrosion resistance requirement, and for H-containing material 2 The acidic environment of S, the metal material can be nickel-based corrosion-resistant alloy material represented by C276 to meet the corrosion resistance requirement; the nonmetallic material related by the invention should meet the requirements of high temperature resistance and ageing resistance under experimental conditions. In addition, the weak link of the structural design related by the invention should meet the pressure-resistant requirement of the experimental working condition.
The copper sleeve and the wire clamp 5 conduct the conductive column 1 with the working electrode and realize electric connection. The copper bush is connected with the wire clamp 5 through a radial threaded hole, and is connected with the conductive column 1 through an axial threaded hole, so that electric connection is realized. The specific process of connecting the conductive post 1 with the axial threaded hole is as follows: when the copper bush is sleeved on the lower end 7 of the connector, the axial threaded hole of the copper bush corresponds to the strip-shaped through hole of the lower end 7 of the connector, the conductive column 1 moves downwards along the inner cylinder wall of the connector 2, and then penetrates through the strip-shaped through hole and then is connected in the axial threaded hole of the copper bush. The copper bush and the insulating isolation sleeve 8 are fixed on the outer wall of the lower end 7 of the joint through an inner back cap 9. The wire clamp 5 is used for installing and fixing an electrode, and at least comprises: a cylindrical rod with a notch, a threaded hole, a fastening bolt 4 and a fluororubber O-shaped sealing ring; the cylindrical rod with the notch is connected to the copper sleeve through threads at one end, and is provided with a fluororubber O-shaped sealing ring for sealing with the outer back cap 10; the notched cylindrical rod is connected with a wire 11 on a sample 12 through the fastening bolt 4.
The electric insulation is realized by adopting an outer back cap 10, an insulating isolation sleeve 8, an inner back cap 9 and connecting different working electrodes and the high-temperature high-pressure reaction vessel.
The application method of the embodiment of the invention comprises the following steps:
according to the assembled experimental device shown in fig. 1, the upper cover of the high-temperature and high-pressure reaction vessel matched with the joint 2 is opened, the upper cover and the vessel body are also sealed by a sealing ring, and the joint 2 is arranged on the upper cover of the experimental vessel. The conductive post 1 was passed through the center hole of the upper lid of the experimental vessel and led to the lower end 7 of the connector. The insulating isolation sleeve 8 and the copper sleeve are alternately distributed and sleeved on the outer wall of the lower end 7 of the joint, and the inner back cap 9 is arranged at the end head of the lower end 7 of the joint so as to fix the insulating isolation sleeve 8 and the copper sleeve. The conductive column 1 is adjusted to a proper position, so that the conductive column is fixed by means of the connection between each copper sleeve and the threaded end of the wire clamp 5; then the fastening bolt 4 is connected with one end of the wire clamp 5 with a threaded hole, the corresponding electrode is fixed on the fastening bolt 4, and a connecting passage is formed through the wire clamp 5, so that the conductive column 1 is in a communicating state with the working electrode in the test container. And then, the outer back cap 10 is sleeved on the outer wall of the copper sleeve and the insulating isolation sleeve 8, and is connected with the upper cover of the joint 2 through four fastening bolts 4, and the tightness is kept under the joint 2 by using the double-layer sealing ring 3, so that the electrode system device for evaluating the galvanic corrosion sensitivity under the conditions of high temperature and high pressure can be formed. The remaining operations and connections are consistent with conventional electrochemical testing procedures. It is required that the test solution not exceed the lowest end of the system set-up.
Before the experiment, nitrogen (N) 2 ) Performing leak detection on an electrode system device for evaluating galvanic corrosion sensitivity under high-temperature and high-pressure conditions, and fastening and adjusting a leakage source if a leakage phenomenon is found; if the air tightness is good, connecting the inner lead end and the outer lead end of the experimental container of the system device by using a measuring meter, detecting whether the connection conductivity is normal, if so, respectively connecting the galvanic corrosion sample 12 with the conductor, and then fixing the device to matched electrochemical test equipment and experimentA galvanic corrosion susceptibility test was prepared on the vessel.
In addition, the invention effectively controls the error generated when the traditional electrode system device is fixedly installed, so that the availability of the data result is greatly improved; meanwhile, the electrode system is used as an integral and space-closed device and is isolated from the outside, and is communicated only by virtue of conductors, so that the influence of external factors is avoided; the method is suitable for galvanic corrosion electrochemical test experiments under high-temperature and high-pressure environment conditions, breaks through galvanic corrosion sensitivity evaluation experiments which can be performed only at normal temperature at present, and has the advantages of high accuracy, high test efficiency, convenience in installation, high economic applicability and the like.
The metal material related to the device should meet the corrosion resistance requirement of the experimental working condition. As for CO-containing 2 In the environment, the metal material can be 316L material to meet the corrosion resistance requirement, and for H-containing material 2 In the acidic environment of S, the metal material can be selected from nickel-based corrosion-resistant alloy materials represented by C276 to meet the corrosion resistance requirement. In addition, the nonmetallic materials related to the device should meet the requirements of high temperature resistance and ageing resistance of the experimental working conditions, and the weak links of the structural design related to the device should meet the pressure resistance requirements of the experimental working conditions.
The invention has the beneficial effects that the galvanic corrosion electrochemical characteristics of the sample 12 under the conditions of high temperature and high pressure are tested by connecting with a reaction vessel and other electrochemical testing equipment, the galvanic corrosion sensitivity is evaluated by the characteristics, specific corrosion behavior and corrosion failure cause are researched and analyzed, and references are provided for the later material selection and the application under the actual working condition.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (8)
1. A couple corrosion test device for under high temperature high pressure environment, its characterized in that: including being the sleeve-shaped joint, the lower extreme that connects is located the outer back of the body cap that insulating material made, connect with outer back of the body cap fixed sealing connection, the cover is equipped with two at least metal covers on the lower extreme outer wall of joint, is equipped with insulating spacer sleeve between two adjacent metal covers, be equipped with radial screw hole on the outer wall of metal cover, be equipped with axial screw hole on the terminal surface of metal cover, at least two bar through-holes have been seted up on the wall of joint lower extreme, bar through-hole with the quantity of metal cover is the same, axial screw hole on the metal cover sets up with bar through-hole one-to-one, be connected with the fastener on the radial screw hole of metal cover, the fastener passes outer back of the body cap and is equipped with the sealing member between the outer back of the body cap, the fastener is used for connecting working electrode.
2. The galvanic corrosion test device according to claim 1, wherein: the pipe wall thickness of joint upper end is greater than the pipe wall thickness of lower extreme, be equipped with first ring flange on the outer pipe wall of upper end of joint, the opening part of outer back of the body cap is equipped with the second ring flange, connect with outer back of the body cap passes through first ring flange and second ring flange bolted connection.
3. The galvanic corrosion test device according to claim 2, wherein: two O-shaped sealing rings are arranged between the upper end of the connector and the outer back cap.
4. The galvanic corrosion test device according to claim 3, wherein: the metal sleeve is a copper sleeve, the number of the copper sleeves is three, and the number of the strip-shaped through holes is also three.
5. The galvanic corrosion test device according to claim 4, wherein: an inner back cap made of an insulating material is connected at the end head of the lower end of the connector in a threaded manner.
6. The galvanic corrosion test device according to claim 5, wherein: the end of the wire clamp is connected with a fastening bolt, and the wire clamp is connected with a working electrode through the fastening bolt.
7. The galvanic corrosion test device according to claim 6, wherein: and a sealing piece between the wire clamp and the outer back cap is an O-shaped sealing ring.
8. The galvanic corrosion test device according to claim 7, wherein: the outer back cap, the insulating isolation sleeve and the inner back cap are made of polytetrafluoroethylene.
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| CN201811033252.9A CN109060925B (en) | 2018-09-05 | 2018-09-05 | Couple corrosion test device used in high-temperature high-pressure environment |
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| CN201811033252.9A CN109060925B (en) | 2018-09-05 | 2018-09-05 | Couple corrosion test device used in high-temperature high-pressure environment |
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| CN110102235B (en) * | 2019-05-07 | 2021-01-19 | 北京缔森科技发展有限公司 | High-temperature high-pressure electrochemical reactor |
| CN111220532B (en) * | 2020-01-18 | 2020-12-18 | 温州新国余机械科技有限公司 | Testing arrangement of electrode high temperature corrosivity for glass electric melting furnace |
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