CN113624670A - Metal corrosion fatigue testing device and method - Google Patents
Metal corrosion fatigue testing device and method Download PDFInfo
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- CN113624670A CN113624670A CN202110874729.1A CN202110874729A CN113624670A CN 113624670 A CN113624670 A CN 113624670A CN 202110874729 A CN202110874729 A CN 202110874729A CN 113624670 A CN113624670 A CN 113624670A
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- 230000007797 corrosion Effects 0.000 title claims abstract description 73
- 238000005260 corrosion Methods 0.000 title claims abstract description 73
- 238000009661 fatigue test Methods 0.000 title claims abstract description 51
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 49
- 239000002184 metal Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 111
- 238000006243 chemical reaction Methods 0.000 claims abstract description 57
- 238000010438 heat treatment Methods 0.000 claims abstract description 53
- 238000012360 testing method Methods 0.000 claims abstract description 35
- 238000003756 stirring Methods 0.000 claims description 26
- 238000007789 sealing Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000010953 base metal Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- 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
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Abstract
The invention provides a metal corrosion fatigue testing device and a method, wherein the metal corrosion fatigue testing device comprises a reaction kettle; circulation mechanism, circulation mechanism include liquid reserve tank, pump and heating member, and in the liquid reserve tank was located to the pump to be connected through feed liquor pipe and reation kettle's inlet, reation kettle's liquid outlet passes through the drain pipe to be connected with the liquid reserve tank, and in the liquid reserve tank was located to the heating member, be used for heating the corrosive medium in the liquid reserve tank. The invention realizes that the corrosive medium is provided for the reaction kettle in a circulating way, so that the concentration of the corrosive medium in the reaction kettle is kept stable, and the test precision is improved; the heating member heats the corrosive medium, satisfies the required temperature of test, realizes the test of high temperature corrosion environment, improves the degree of accuracy and the reliability of test result.
Description
Technical Field
The invention relates to the technical field of metal corrosion fatigue testing, in particular to a metal corrosion fatigue testing device and a metal corrosion fatigue testing method.
Background
The existing device for measuring the metal corrosion fatigue mostly adopts an opening independent container which is hung on a fatigue sample and is filled with a corrosion medium as a reaction kettle so as to provide a required corrosion environment. In the corrosion fatigue test of the welding joint, the experiment is generally required to be carried out by using a low-frequency fatigue machine with the loading frequency of less than 10Hz, the experiment time is longer than that of the fatigue test of a conventional metal base metal, the corrosion medium is inevitably evaporated in the experiment process, the solute in the corrosion solution is consumed by long-time corrosion, the concentration of the corrosion medium is fluctuated, and the test result is unreliable.
As the fatigue test is a dynamic loading process, the sample can vibrate along with the change of axial force, the conventional corrosion fatigue reaction kettle has smaller design size, and in order to prevent corrosion medium from escaping due to liquid level fluctuation, less corrosion solution is put into the reaction kettle, or the loading frequency is reduced as much as possible, but the fatigue machine can be damaged.
The conventional corrosion fatigue method can only provide a corrosion environment at normal temperature, cannot meet the requirement of a high-temperature corrosion environment, and can generate large temperature fluctuation if a small amount of corrosion medium in the reaction kettle is heated, so that the test result is influenced.
Disclosure of Invention
The invention provides a metal corrosion fatigue testing device and a metal corrosion fatigue testing method, which are used for overcoming the defects that the concentration of a corrosion medium in a reaction kettle fluctuates and high-temperature testing cannot be realized in the prior art, realizing the supply of a high-temperature circulating flow corrosion medium to the reaction kettle, ensuring that the concentration and the temperature of the corrosion medium in the reaction kettle meet the testing requirement, and improving the accuracy of a testing result.
The invention provides a metal corrosion fatigue testing device, comprising:
a reaction kettle;
circulation mechanism, circulation mechanism includes liquid reserve tank, pump and heating member, the pump is located in the liquid reserve tank to through the feed liquor pipe with reation kettle's inlet is connected, reation kettle's liquid outlet pass through the drain pipe with the liquid reserve tank is connected, the heating member is located in the liquid reserve tank, be used for heating corrosive medium in the liquid reserve tank.
The metal corrosion fatigue testing device further comprises a control mechanism, wherein the control mechanism comprises a controller, and the controller is respectively connected with the pump and the heating element.
According to the metal corrosion fatigue testing device provided by the invention, a liquid level switch is arranged in the liquid storage tank and is connected with the controller.
According to the metal corrosion fatigue testing device provided by the invention, the circulating mechanism further comprises a stirring shaft, a stirring paddle and a motor, the stirring paddle is connected with the stirring shaft and arranged in the liquid storage tank, the stirring shaft is connected with the output end of the motor, and the motor is connected with the controller.
According to the metal corrosion fatigue testing device provided by the invention, the control mechanism further comprises an upper computer, and the upper computer is connected with the controller.
According to the metal corrosion fatigue testing device provided by the invention, the liquid inlet pipe is provided with the flowmeter and the pressure gauge.
According to the metal corrosion fatigue testing device provided by the invention, the plurality of heating elements are arranged, and the plurality of heating elements are arranged along the circumferential direction of the liquid storage tank.
According to the metal corrosion fatigue testing device provided by the invention, the heating element is a thermocouple.
According to the metal corrosion fatigue testing device provided by the invention, the reaction kettle is a coated reaction kettle.
The invention also provides a metal corrosion fatigue testing method, which comprises the following steps:
assembling the sample in the reaction kettle, sealing the gap, and clamping the reaction kettle in a fatigue machine;
heating the corrosive medium in the liquid storage tank to a required temperature through the heating element, wherein the pump provides power for circulating the corrosive medium between the reaction kettle and the liquid storage tank;
and starting the fatigue machine until the test is finished.
The metal corrosion fatigue testing device and method provided by the invention are characterized in that a reaction kettle is arranged; the circulating mechanism comprises a liquid storage tank, a pump and a heating element, the pump is arranged in the liquid storage tank and is connected with a liquid inlet of the reaction kettle through a liquid inlet pipe, a liquid outlet of the reaction kettle is connected with the liquid storage tank through a liquid outlet pipe, the heating element is arranged in the liquid storage tank and is used for heating a corrosive medium in the liquid storage tank, so that the corrosive medium is circularly provided for the reaction kettle, the concentration of the corrosive medium in the reaction kettle is kept stable, and the testing precision is improved; the heating member heats the corrosive medium, satisfies the required temperature of test, realizes the test of high temperature corrosion environment, improves the degree of accuracy and the reliability of test result.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a metal corrosion fatigue testing device provided by the present invention;
FIG. 2 is a schematic structural diagram of a reaction kettle in the metal corrosion fatigue testing apparatus provided by the present invention;
reference numerals:
1: a stirring paddle; 2: a liquid storage tank; 3: a motor;
4: a liquid inlet pipe; 5: a reaction kettle; 6: a sample;
7: a liquid level switch; 8: a liquid outlet pipe; 9: a heating member;
10: an upper computer; 11: a controller; 12: a pump;
13: etching the medium; 14: a liquid inlet; 15: and a liquid outlet.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
A metal corrosion fatigue test apparatus of the present invention is described below with reference to fig. 1 to 2, and includes:
a reaction kettle 5;
circulation mechanism, circulation mechanism include liquid reserve tank 2, pump 12 and add heat-insulating material 9, and pump 12 is located in liquid reserve tank 2 to be connected with reation kettle 5's inlet 14 through feed liquor pipe 4, reation kettle 5's liquid outlet 15 is connected with liquid reserve tank 2 through drain pipe 8, adds heat-insulating material 9 and locates in liquid reserve tank 2, is used for heating corrosion medium 13 in the liquid reserve tank 2. It can be understood that the reaction kettle 5 is used as a structure for assembling and testing the sample 6, and the corrosion medium 13 is used for carrying out a corrosion fatigue fracture test on the sample 6. The circulation mechanism realizes circulation of the corrosive medium 13 in the reaction kettle 5 outside the reaction kettle 5. Specifically, the circulating mechanism comprises a liquid storage tank 2 used for storing a corrosive medium 13, a pump 12 used for providing power for circulating and circulating the corrosive medium 13 between the reaction kettle 5 and the liquid storage tank 2, and a heating element 9 used for heating the corrosive medium 13 in the liquid storage tank 2 to the temperature required by the test.
It is worth explaining that, the volume of liquid reserve tank 2 is far greater than the reaction chamber of reation kettle 5, that is to say, the volume of corrosive medium 13 in liquid reserve tank 2 is far greater than the volume of corrosive medium 13 in reation kettle 5, and then, the corrosive medium 13 after reacting with sample 6 flows back to liquid reserve tank 2 to mix with corrosive medium 13 in liquid reserve tank 2, the influence to the whole concentration of corrosive medium 13 can be ignored, the uniformity of the concentration of corrosive medium 13 of realizing reacting with sample 6, improve experimental accuracy.
In a similar way, the heating member 9 heats the corrosive medium 13 in the liquid storage tank 2 all the time, and maintains at the temperature required by the test, the corrosive medium 13 after the reaction flows back to the liquid storage tank 2, because the difference of the relative quantity is very large, so the temperature fluctuation can be completely ignored, and then the liquid storage tank 2 is guaranteed to convey the corrosive medium 13 of constant temperature to the reaction kettle 5 in real time, the temperature requirement of the high-temperature test is met, and the accuracy and the reliability of the test result are guaranteed.
Referring to fig. 2, the liquid inlet 14 of the reaction vessel 5 is located at the lower side, and the liquid outlet 15 is located at the upper side, that is, the vertical height of the liquid inlet 14 is smaller than the vertical height of the liquid outlet 15, so that the corrosive medium 13 is injected from the lower side of the reaction vessel 5, and after the corrosive medium 13 fills the whole reaction vessel 5, the corrosive medium reaches the vertical height of the liquid outlet 15, and then flows back into the liquid storage tank 2 through the liquid outlet pipe 8 via the liquid outlet 15, thereby ensuring the test to be fully contacted with the corrosive medium 13.
The metal corrosion fatigue testing device further comprises a control mechanism, wherein the control mechanism comprises a controller 11, and the controller 11 is respectively connected with the pump 12 and the heating element 9. It can be understood that the controller 11 is respectively connected with the pump 12 and the heating element 9, and the working parameters of the pump 12 are set, so as to control the flow rate of the circulating flow of the corrosive medium 13, and meanwhile, the heating temperature is controlled by controlling the heating parameters of the heating element 9, so that the accuracy of the test is ensured.
According to the metal corrosion fatigue testing device provided by the invention, the liquid level switch 7 is arranged in the liquid storage tank 2, and the liquid level switch 7 is connected with the controller 11. It can be understood that a liquid level switch 7 is arranged in the liquid storage tank 2, and the monitoring of the amount of the corrosive medium 13 in the liquid storage tank 2 is realized. The liquid level switch 7 is connected with the controller 11, when the liquid level switch 7 monitors that the liquid level of the corrosive medium 13 is lower than the safety height, the liquid level switch 7 sends an alarm prompt to the controller 11, the controller 11 sends a stop instruction to the pump 12 and the heating element 9, and a worker adds the corrosive medium 13 to ensure that the corrosive medium 13 is sufficient.
According to the metal corrosion fatigue testing device provided by the invention, the circulating mechanism further comprises a stirring shaft, a stirring paddle 1 and a motor 3, the stirring paddle 1 is connected with the stirring shaft and arranged in the liquid storage tank 2, the stirring shaft is connected with the output end of the motor 3, and the motor 3 is connected with the controller 11. It can be understood that the circulating mechanism further comprises a stirring shaft, stirring paddles 1 and a motor 3, wherein the stirring shaft is vertically inserted into the liquid storage tank 2, the stirring paddles 1 are installed on the stirring shaft, and a plurality of stirring paddles 1 are arranged along the axial direction of the stirring shaft in order to improve the stirring effect. Motor 3 installs in the top side of liquid reserve tank 2, and its output is connected with the upper end of (mixing) shaft, realizes rotatory to the drive of (mixing) shaft, and then accomplishes the stirring to corrosive medium 13 in the liquid reserve tank 2. The motor 3 is connected with the controller 11, the rotating speed of the motor 3 is set, the controller 11 can control the starting and stopping of the motor 3, and when the liquid level switch 7 sends an alarm signal, the controller 11 sends a stop instruction to the motor 3.
According to the metal corrosion fatigue testing device provided by the invention, the control mechanism further comprises an upper computer 10, and the upper computer 10 is connected with the controller 11. It can be understood that the upper computer 10 is connected to the controller 11, and is used for inputting the operating parameters of the pump 12, the heating element 9 and the motor 3 into the controller 11.
According to the metal corrosion fatigue testing device provided by the invention, the liquid inlet pipe 4 is provided with the flowmeter and the pressure gauge. It can be understood that the flow meter monitors the flow rate of the corrosive medium 13 in the liquid inlet pipe 4 in real time, and the pressure gauge monitors the pressure of the corrosive medium 13 in the liquid inlet pipe 4 in real time. Flowmeter and pressure gauge all are connected with controller 11, realize transmitting the flow information and the pressure information who gather to controller 11 to send for host computer 10, show, make things convenient for the staff to observe the flow parameter of corrosive medium 13.
In one embodiment the reservoir 2 is provided with a thermometer for monitoring the temperature of the corrosive medium 13 in the reservoir 2 in real time. The thermometer is connected with controller 11, realizes transmitting the temperature information who gathers to controller 11 to send the temperature value to host computer 10, show, make things convenient for the staff to observe the temperature value of corrosive medium 13. If the temperature monitored by the thermometer does not reach the test temperature, the pump 12 is closed, the corrosive medium 13 is heated to the test temperature by the heating element 9, and then the pump 12 is started to carry out the feeding of the circulating pump 12 of the corrosive medium 13.
According to the metal corrosion fatigue testing device provided by the invention, the plurality of heating members 9 are arranged, and the plurality of heating members 9 are arranged along the circumferential direction of the liquid storage tank 2. It will be appreciated that in order to improve the efficiency and uniformity of heating of the corrosive medium 13 by the heating members 9, a plurality of heating members 9 are provided within the reservoir 2 and are uniformly arranged along the circumferential direction of the reservoir 2.
According to the metal corrosion fatigue testing device provided by the invention, the heating element 9 is a thermocouple. In this embodiment, the heating member 9 is a thermocouple. Of course, other structures for heating the liquid may be used, such as a heating rod.
In this embodiment, the pump 12 is an electromagnetic pump.
According to the metal corrosion fatigue testing device provided by the invention, the reaction kettle 5 is a coating type reaction kettle 5. In this embodiment, the coating type reaction kettle 5 is selected as the reaction kettle 5, so that the test position of the sample 6 can be effectively soaked in the corrosive medium 13, and the test accuracy is ensured.
The metal corrosion fatigue testing method provided by the invention is described below, and the metal corrosion fatigue testing method described below and the metal corrosion fatigue testing device described above can be referred to correspondingly.
The invention also provides a metal corrosion fatigue testing method, which comprises the following steps:
assembling the sample 6 in the reaction kettle 5, sealing the gap, and clamping the reaction kettle 5 in a fatigue machine;
the corrosive medium 13 in the liquid storage tank 2 is heated to a required temperature by the heating element 9, and the pump 12 provides power for circulating the corrosive medium 13 between the reaction kettle 5 and the liquid storage tank 2;
and starting the fatigue machine until the test is finished.
The embodiment of the invention provides a metal corrosion fatigue test method, which takes an aluminum alloy welding joint as a sample 6 and specifically comprises the following steps:
assembling an aluminum alloy welding joint fatigue sample 6 in a coating type reaction kettle 5, fixing the coating type reaction kettle 5 through a fastening screw, and sealing a gap by using a silicon rubber waterproof material;
clamping a coated reaction kettle 5 with a sample 6 on a low-frequency fatigue machine, correspondingly connecting a liquid inlet pipe 4 and a liquid outlet pipe 8 to form circulating communication between the coated reaction kettle 5 and a liquid storage tank 2, and filling a corrosion solution with a specified depth into the liquid storage tank 2;
the controller 11 is controlled by the upper computer 10, parameters such as the flow speed, the temperature and the stirring rotating speed of the required corrosive medium 13 are set, monitoring data of a thermometer, a pressure gauge and a flowmeter are collected in real time, and when the corrosive medium 13 in the liquid storage tank 2 reaches the temperature required by the test, the electromagnetic pump is started;
after the corrosive medium 13 runs stably in a circulating mode, fatigue test parameters are set through the upper computer 10, the low-frequency fatigue machine is started to load fatigue loads, and the controller 11 collects liquid level information monitored by the liquid level switch 7 in real time;
and (3) after the test has corrosion fatigue fracture, closing the low-frequency fatigue machine, the electromagnetic pump and the motor 3, taking down the sample 6 and the reaction kettle 5, and treating the corrosive liquid.
The metal corrosion fatigue testing device and method provided by the invention are characterized in that a reaction kettle is arranged; the circulating mechanism comprises a liquid storage tank, a pump and a heating element, the pump is arranged in the liquid storage tank and is connected with a liquid inlet of the reaction kettle through a liquid inlet pipe, a liquid outlet of the reaction kettle is connected with the liquid storage tank through a liquid outlet pipe, the heating element is arranged in the liquid storage tank and is used for heating a corrosive medium in the liquid storage tank, so that the corrosive medium is provided for the circulation of the reaction kettle, the concentration of the corrosive medium in the reaction kettle is kept stable, and the testing precision is improved; the heating member heats the corrosive medium, satisfies the required temperature of test, realizes the test of high temperature corrosion environment, improves the degree of accuracy and the reliability of test result.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A metal corrosion fatigue testing apparatus, comprising:
a reaction kettle;
circulation mechanism, circulation mechanism includes liquid reserve tank, pump and heating member, the pump is located in the liquid reserve tank to through the feed liquor pipe with reation kettle's inlet is connected, reation kettle's liquid outlet pass through the drain pipe with the liquid reserve tank is connected, the heating member is located in the liquid reserve tank, be used for heating corrosive medium in the liquid reserve tank.
2. The metal corrosion fatigue testing device of claim 1, further comprising a control mechanism including a controller connected to the pump and the heating element, respectively.
3. The metal corrosion fatigue testing device of claim 2, wherein a liquid level switch is arranged in the liquid storage tank, and the liquid level switch is connected with the controller.
4. The metal corrosion fatigue testing device of claim 2, wherein the circulating mechanism further comprises a stirring shaft, a stirring paddle and a motor, the stirring paddle is connected with the stirring shaft and arranged in the liquid storage tank, the stirring shaft is connected with an output end of the motor, and the motor is connected with the controller.
5. The metal corrosion fatigue testing device of claim 2, wherein the control mechanism further comprises an upper computer, and the upper computer is connected with the controller.
6. The metal corrosion fatigue testing device of any one of claims 1 to 5, wherein a flow meter and a pressure gauge are provided on the liquid inlet pipe.
7. The metal corrosion fatigue testing device of any one of claims 1 to 5, wherein the heating member is provided in plurality, and a plurality of the heating members are provided along a circumferential direction of the reservoir tank.
8. The metal corrosion fatigue testing apparatus of any one of claims 1 to 5, wherein the heating element is a thermocouple.
9. The metal corrosion fatigue testing device of any one of claims 1 to 5, wherein the reaction kettle is a clad reaction kettle.
10. A testing method based on the metal corrosion fatigue testing device of any one of claims 1 to 9, characterized by comprising the steps of:
assembling the sample in the reaction kettle, sealing the gap, and clamping the reaction kettle in a fatigue machine;
heating the corrosive medium in the liquid storage tank to a required temperature through the heating element, wherein the pump provides power for circulating the corrosive medium between the reaction kettle and the liquid storage tank;
and starting the fatigue machine until the test is finished.
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| CN202110874729.1A CN113624670A (en) | 2021-07-30 | 2021-07-30 | Metal corrosion fatigue testing device and method |
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Application publication date: 20211109 |
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