CN113390776A - Corrosion test device and corrosion test method - Google Patents
Corrosion test device and corrosion test method Download PDFInfo
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- CN113390776A CN113390776A CN202110391410.3A CN202110391410A CN113390776A CN 113390776 A CN113390776 A CN 113390776A CN 202110391410 A CN202110391410 A CN 202110391410A CN 113390776 A CN113390776 A CN 113390776A
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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
- G01N17/002—Test chambers
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- 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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- 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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- 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
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- 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
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- 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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- 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
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0062—Crack or flaws
- G01N2203/0066—Propagation of crack
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- 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
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- 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
- G01N2203/023—Pressure
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Abstract
The invention discloses a corrosion test device, which comprises a water tank, a throttle valve, a sealing structure and a back pressure valve which are mutually communicated, wherein the water tank is used for containing corrosive liquid and can adjust the temperature of the corrosive liquid, and the throttle valve and the back pressure valve adjust the pressure of the corrosive liquid. The invention also relates to a corrosion test method for carrying out a corrosion test based on the corrosion test device.
Description
Technical Field
The invention relates to a corrosion test, in particular to a corrosion test device and a corrosion test method based on the corrosion test device.
Background
Corrosion has a significant impact on the texture and mechanical properties of the material. The general corrosion resistance research is to place the material in a corrosive medium or environment, place the material for a period of time, take out the sample and perform corresponding performance test. This corrosion test only considers the final corrosion result and does not focus on the process, known as off-line corrosion. In actual parts, such as pressure vessel pipes, the corrosive medium inside the pipes has a certain temperature and pressure, and the pipes are in a variable stress state. For the real-time crack propagation behavior research under the corrosion environment, the test result after off-line corrosion cannot fully reflect the real result. For the common crack propagation research under the combined action of stress corrosion or external load and a corrosion environment, the offline corrosion test cannot meet the requirement.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a corrosion test device which can regulate and control the temperature and the pressure of a corrosive medium in a sealed cavity within a certain range and can change the external force applied to a sample.
In order to overcome the defects of the prior art, the invention also aims to provide a corrosion test method which can regulate and control the temperature and the pressure of a corrosive medium in a sealed cavity within a certain range and can change the external force applied to a sample.
One of the purposes of the invention is realized by adopting the following technical scheme:
the utility model provides a corrosion test device, includes water tank, choke valve, seal structure, the back pressure valve that communicates each other, the water tank is used for holding the corrosive liquids and can adjusts the temperature of corrosive liquids, the choke valve and the corrosive liquids pressure is adjusted to the back pressure valve, seal structure includes lower main part, last main part, fastener and sealing washer, down the main part with go up and pass through between the main part the fastener is fixed, down the main part with go up and form sealed chamber and accepting groove between the main part, sealed chamber with the accepting groove intercommunication, accepting groove and outside intercommunication, the sealing washer is located sealed chamber and between the accepting groove.
Furthermore, the lower main body and the upper main body are respectively provided with a groove, and the grooves of the lower main body and the grooves of the upper main body are folded to form the sealing cavity.
Furthermore, the number of the accommodating grooves is two, and the two accommodating grooves are respectively located at two opposite ends of the sealed cavity.
Furthermore, the sealing cavity and the two accommodating grooves are positioned on the same straight line.
Further, the sealing structure is further provided with a threaded hole, the threaded hole is communicated with the sealing cavity, and the sealing structure is communicated with the throttling valve and the back pressure valve through the threaded hole.
Further, a threaded hole communicated with the throttle valve is formed in the upper body, and a threaded hole communicated with the back pressure valve is formed in the lower body.
Further, seal structure still includes sealed the pad, the lower main part is equipped with the seal groove, it is equipped with the boss to go up the main part, sealed the pad is located in the seal groove, the boss pushes down in the seal groove and contradict sealed the pad.
The second purpose of the invention is realized by adopting the following technical scheme:
a corrosion test method based on the corrosion test device comprises the following steps
Assembling a corrosion test device: sequentially connecting a water tank, a pump, a throttle valve, a sealing structure and a back pressure valve to form a loop;
punching a sample: through holes are formed in two ends of the sample;
installing a sample: sleeving the sealing rings at two ends of the sample, installing the sample in the sealing cavity, fixing the upper main body and the lower main body to enable the area near the crack of the sample to be located in the sealing cavity, and enabling two ends of the sample to extend out of the sealing structure;
adjusting the temperature and pressure: the temperature of the corrosive liquid is regulated through a water tank, and the pressure of the corrosive liquid is regulated through a throttle valve and the back pressure valve;
applying the tensile force required by the test to the test sample: two ends of the sample are connected with a clamp of a tensile testing machine through a through hole, and the tensile testing machine applies tensile force;
and recording the loading force and storing the appearance of the crack at different times.
Further, the corrosion test method further comprises a sample edge processing step, wherein the sample edge processing step specifically comprises the following steps: and the axial edges at the two ends of the sample are rounded, so that the sample is matched with the sealing ring more closely.
Further, the step of assembling the corrosion test device further comprises the step of installing a pressure gauge between the sealing structure and the backpressure valve, wherein the pressure gauge displays the pressure of the corrosive liquid in the sealing structure.
Compared with the prior art, the water tank of the corrosion test device is used for containing corrosive liquid and adjusting the temperature of the corrosive liquid, the throttle valve and the back pressure valve are used for adjusting the pressure of the corrosive liquid, the sealing cavity of the sealing structure is communicated with the containing groove, the containing groove is communicated with the outside, when the sample is installed on the sealing structure, the middle crack and the nearby area of the sample are located in the sealing cavity for testing, the two ends of the sample extend out of the containing groove, the tensile force is convenient to load, and meanwhile, the external force applied by the two ends of the sample can be changed.
Drawings
FIG. 1 is a schematic structural diagram of a corrosion test apparatus according to the present invention;
FIG. 2 is an exploded view of a seal structure of the corrosion test apparatus of FIG. 1;
fig. 3 is a sectional view of a sealing structure of the corrosion test apparatus of fig. 1.
In the figure: 1. a water tank; 2. a pump; 3. a one-way valve; 4. a throttle valve; 5. a sealing structure; 51. a lower body; 510. a sealing groove; 52. an upper body; 520. a boss; 53. a fastener; 54. a seal ring; 55. a gasket; 56. a groove; 6. a pressure gauge; 7. a back pressure valve; 8. a stop valve; 200. a sample; 201. and a through hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present, secured by intervening elements. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly disposed on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 3, a corrosion testing apparatus for in-situ observation of crack propagation behavior in a corrosive environment of a sample 200 according to the present invention is shown. The in-situ observation of the crack propagation behavior in the corrosive environment is tested and the device is not researched at home at present.
The corrosion test device comprises a water tank 1, a pump 2, a one-way valve 3, a throttle valve 4, a sealing structure 5, a pressure gauge 6, a backpressure valve 7 and a stop valve 8.
The water tank 1 is a temperature-controllable water tank, and can regulate and control the temperature of a corrosive medium. In this application, the water tank 1 is used to regulate the temperature of the etching liquid. Before use, the corrosion medium in the water tank 1 is heated to a preset temperature and then is kept at a constant temperature, the water tank 1 is completely sealed in the use process, and the heating temperature range is from normal temperature to 100 ℃. The water outlet of the water tank 1 connected with the pump 2 is close to the bottom end, and the water inlet connected with the back pressure valve 7 is close to the upper end.
The pump 2 is a diaphragm pump.
The seal structure 5 includes a lower body 51, an upper body 52, a fastener 53, a seal ring 54, and a seal gasket 55. The lower body 51 and the upper body 52 are provided with screw holes as an inlet and an outlet of the sealing structure 5, respectively. The lower body 51 and the upper body 52 are respectively provided with a groove 56, and the fastening member 53 is a hexagon socket head cap screw. The fastening member 53 is used to fix the lower body 51 and the upper body 52, and at this time, a sealed cavity and two receiving grooves are formed between the lower body 51 and the upper body 52, the two receiving grooves are respectively located at two opposite ends of the sealed cavity, and the sealed cavity and the two receiving grooves are located on the same straight line. The accommodating groove is communicated with the outside. The seal ring 54 is an O-ring seal. The gasket 55 is a side rubber gasket. The lower body 51 is provided with a sealing groove 510, the upper body 52 is provided with a boss 520, the gasket 55 is located in the sealing groove 510, and the boss 520 is pressed into the sealing groove 510 to contact the gasket 55, so as to achieve the sealing effect.
The throttle valve 4 and the backpressure valve 7 regulate the pressure of the corrosive medium in the sealing cavity of the sealing structure 5. The pressure in the sealed cavity can be displayed by a pressure gauge 6, and the display value of the pressure gauge 6 reaches a preset value by rotating a backpressure valve 7 and a throttle valve 4.
When the corrosion test device is assembled, the water tank 1 and the pump 2 are placed well, the water outlet of the water tank 1 is connected with the water inlet of the pump 2 through a rubber hose, and the water outlet of the pump 2 is connected with the inlet of the one-way valve 3 through a steel pipe. The outlet of the one-way valve 3 is connected with a three-way joint through a steel pipe, and the other two interfaces of the three-way joint are respectively connected with the throttle valve 4 and the stop valve 8 through steel pipes. The outlet of the throttle valve 4 is connected with the inlet of the sealing structure 5 through a hose, and the outlet of the sealing structure 5, the outlet of the stop valve 8, the pressure gauge 6 and the inlet of the backpressure valve 7 are connected through a four-way valve. The outlet of the back pressure valve 7 is connected to the inlet of the water tank 1. Before use, a corrosive medium is added into the water tank 1, heated to a preset temperature, kept at a constant temperature and tightly screwed with the throttle valve 4 and the stop valve 8.
In order to reduce the volume of the sealing structure 5 and avoid corrosion of the clamping head of the test sample 200 by a corrosion medium, only the middle cracks and the nearby areas of the single-edge notch tensile test sample 200 are etched. In use, the sample 200 is perforated at both ends with holes 201. Sealing rings 54 are placed in grooves 56 at both ends of the upper body 52 and the lower body 51, and the two ends of the sample 200 are placed in the sealing rings 54. For better sealing, the axial edges of the two ends of the tensile test piece 200 are rounded, so that the test piece 200 can be tightly matched with the sealing ring 54, and the center line of the sealing ring 54 and the center line of the groove 56 are positioned on the same plane. This design not only allows the specimen 200 to expand and contract axially, but also provides good sealing against corrosive environments. The boss 520 on the connecting surface of the upper body 52 is aligned with the sealing groove 510 on the connecting surface of the lower body 51, and then the upper body 52 and the lower body 51 are fixedly connected by the fastener 53, so that the design is convenient for practical disassembly and assembly and is simple to operate. The two through holes 201 of the sample 200 are fixed to the upper and lower grips of the tensile testing machine, respectively. A certain pulling force is applied to the tensile specimen 200 according to actual requirements. The pump 2 is started after the stop valve 8 is opened, after the corrosion medium circulation and the normal display of the pressure gauge 6 are ensured, the stop valve 8 is screwed down, the throttle valve 4 is opened, and the test is started after the water pressure reaches a preset value and is stable.
The invention also relates to a corrosion test method based on the corrosion test device, which comprises the following steps:
assembling a corrosion test device: the water tank 1, the pump 2, the throttle valve 4, the sealing structure 5 and the back pressure valve 7 are sequentially connected to form a loop;
punching the sample 200: through holes 201 are arranged at two ends of the sample 200;
mounting the sample 200: sealing rings 54 are sleeved at two ends of the sample 200, the sample 200 is installed in the sealing cavity, the upper main body 52 and the lower main body 51 are fixed, so that the area near the crack of the sample 200 is positioned in the sealing cavity, and the two ends of the sample 200 extend out of the sealing structure 5;
adjusting the temperature and pressure: the temperature of the corrosive liquid is regulated through the water tank 1, and the pressure of the corrosive liquid is regulated through the throttle valve 4 and the back pressure valve 7;
the sample 200 is subjected to the tensile force required for the test: two ends of the sample 200 are connected with a clamp of a tensile testing machine through a through hole 201, and the tensile testing machine applies tensile force;
and recording the loading force and storing the appearance of the crack at different times.
Specifically, the corrosion test method further includes a sample 200 edge processing step, where the sample 200 edge processing step specifically includes: the axial edges at both ends of the sample 200 are rounded, so that the sample 200 is matched with the sealing ring 54 more tightly. The step of assembling the corrosion test device also comprises the step of installing a pressure gauge 6 between the sealing structure 5 and the backpressure valve 7, wherein the pressure gauge 6 displays the pressure of the corrosive liquid in the sealing structure 5.
The corrosion test device is small in size and convenient to disassemble and assemble, the axial extension of the sample 200 can be ensured, and the temperature and the pressure of a corrosion medium in the sealing structure 5 can be regulated and controlled within a certain range. The device can be used for dynamically and real-timely researching the expansion morphology and the tip stress field of the crack under the combined action of the corrosion environment and the stress on an X-ray platform. The device can be disassembled, assembled and moved, and is independent of X-ray equipment.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, variations and modifications can be made without departing from the spirit of the invention, and all equivalent modifications and changes can be made to the above embodiments according to the essential technology of the invention, which falls into the protection scope of the invention.
Claims (10)
1. A corrosion test device is characterized in that: the corrosion test device includes water tank, choke valve, seal structure, the back pressure valve that communicates each other, the water tank is used for holding the corrosive liquids and can adjusts the temperature of corrosive liquids, the choke valve and the corrosive liquids pressure force is adjusted to the back pressure valve, seal structure includes lower main part, last main part, fastener and sealing washer, down the main part with go up and pass through between the main part the fastener is fixed, down the main part with form sealed chamber and accepting groove between the last main part, sealed chamber with the accepting groove intercommunication, accepting groove and outside intercommunication, the sealing washer is located sealed chamber and between the accepting groove.
2. The corrosion test apparatus of claim 1, wherein: the lower main body and the upper main body are respectively provided with a groove, and the grooves of the lower main body and the grooves of the upper main body are folded to form the sealing cavity.
3. The corrosion test apparatus of claim 1, wherein: the number of the containing grooves is two, and the two containing grooves are respectively positioned at two opposite ends of the sealed cavity.
4. The corrosion test apparatus of claim 3, wherein: the sealing cavity and the two accommodating grooves are positioned on the same straight line.
5. The corrosion test apparatus of claim 1, wherein: the sealing structure is also provided with a threaded hole which is communicated with the sealing cavity, and the sealing structure is communicated with the throttle valve and the back pressure valve through the threaded hole.
6. The corrosion test apparatus of claim 5, wherein: and the threaded hole communicated with the throttle valve is formed in the upper main body, and the threaded hole communicated with the back pressure valve is formed in the lower main body.
7. The corrosion test apparatus of claim 1, wherein: the sealing structure further comprises a sealing gasket, a sealing groove is formed in the lower main body, a boss is arranged on the upper main body, the sealing gasket is located in the sealing groove, and the boss is pressed into the sealing groove and abutted against the sealing gasket.
8. A corrosion test method to be tested based on the corrosion test apparatus according to any one of claims 1 to 7, characterized in that: comprises the following steps
Assembling a corrosion test device: sequentially connecting a water tank, a pump, a throttle valve, a sealing structure and a back pressure valve to form a loop;
punching a sample: through holes are formed in two ends of the sample;
installing a sample: sleeving the sealing rings at two ends of the sample, installing the sample in the sealing cavity, fixing the upper main body and the lower main body to enable the area near the crack of the sample to be located in the sealing cavity, and enabling two ends of the sample to extend out of the sealing structure;
adjusting the temperature and pressure: the temperature of the corrosive liquid is regulated through a water tank, and the pressure of the corrosive liquid is regulated through a throttle valve and the back pressure valve;
applying the tensile force required by the test to the test sample: two ends of the sample are connected with a clamp of a tensile testing machine through a through hole, and the tensile testing machine applies tensile force;
and recording the loading force and storing the appearance of the crack at different times.
9. The corrosion test method according to claim 8, wherein: the corrosion test method further comprises a sample edge processing step, wherein the sample edge processing step specifically comprises the following steps: and the axial edges at the two ends of the sample are rounded, so that the sample is matched with the sealing ring more closely.
10. The corrosion test method according to claim 8, wherein: and the step of assembling the corrosion test device also comprises the step of installing a pressure gauge between the sealing structure and the backpressure valve, wherein the pressure gauge displays the pressure of the corrosion liquid in the sealing structure.
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| CN202110391410.3A CN113390776A (en) | 2021-04-12 | 2021-04-12 | Corrosion test device and corrosion test method |
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| CN202110391410.3A CN113390776A (en) | 2021-04-12 | 2021-04-12 | Corrosion test device and corrosion test method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101498649A (en) * | 2009-03-11 | 2009-08-05 | 北京航空航天大学 | Portable metallic material tensile stress etching apparatus and method |
| CN102072838A (en) * | 2010-12-15 | 2011-05-25 | 广州合成材料研究院有限公司 | Reliability testing device with temperature control and pressure liquid circulation for sealing fittings |
| CN202420963U (en) * | 2012-01-10 | 2012-09-05 | 西南交通大学 | Sealed corrosive environment simulator for bending fatigue tester |
| US20130133434A1 (en) * | 2011-11-30 | 2013-05-30 | King Fahd University Of Petroleum And Minerals | Stress corrosion cracking testing device |
| CN108562509A (en) * | 2018-03-08 | 2018-09-21 | 中国核电工程有限公司 | A kind of erosion corrosion test device with pressure |
| CN108593537A (en) * | 2018-04-24 | 2018-09-28 | 南京工程学院 | A kind of portable metallic material tensile stress electrochemical corrosion device |
-
2021
- 2021-04-12 CN CN202110391410.3A patent/CN113390776A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101498649A (en) * | 2009-03-11 | 2009-08-05 | 北京航空航天大学 | Portable metallic material tensile stress etching apparatus and method |
| CN102072838A (en) * | 2010-12-15 | 2011-05-25 | 广州合成材料研究院有限公司 | Reliability testing device with temperature control and pressure liquid circulation for sealing fittings |
| US20130133434A1 (en) * | 2011-11-30 | 2013-05-30 | King Fahd University Of Petroleum And Minerals | Stress corrosion cracking testing device |
| CN202420963U (en) * | 2012-01-10 | 2012-09-05 | 西南交通大学 | Sealed corrosive environment simulator for bending fatigue tester |
| CN108562509A (en) * | 2018-03-08 | 2018-09-21 | 中国核电工程有限公司 | A kind of erosion corrosion test device with pressure |
| CN108593537A (en) * | 2018-04-24 | 2018-09-28 | 南京工程学院 | A kind of portable metallic material tensile stress electrochemical corrosion device |
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