CN211347876U - On-line monitoring test device for evaluating corrosion inhibition performance of corrosion inhibitor - Google Patents
On-line monitoring test device for evaluating corrosion inhibition performance of corrosion inhibitor Download PDFInfo
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- CN211347876U CN211347876U CN201921926116.2U CN201921926116U CN211347876U CN 211347876 U CN211347876 U CN 211347876U CN 201921926116 U CN201921926116 U CN 201921926116U CN 211347876 U CN211347876 U CN 211347876U
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Abstract
An on-line monitoring test device for evaluating corrosion inhibition performance of a corrosion inhibitor comprises: the medium environment simulation device is used for simulating a medium environment applied to the corrosion inhibitor, the deoxidizing device for deoxidizing solution and injecting solution by pressure, the linear polarization resistance probe for monitoring corrosion rate, the ventilating device for continuously introducing nitrogen or carbon dioxide gas in the test process and the corrosion inhibitor injecting device for different concentrations. The utility model discloses can realize real-time on-line monitoring to can adjust the corrosion inhibitor filling, and react corrosion rate rapidly, be an important replenishment to the performance evaluation and the screening of corrosion inhibitor.
Description
Technical Field
The utility model relates to a test device for corrosion inhibitor performance evaluation particularly, relates to an evaluation corrosion inhibitor to metal material inhibition performance's online monitoring test device.
Background
Carbon dioxide corrosion not only causes significant economic losses, but also can have catastrophic consequences. The carbon dioxide has extremely strong corrosivity after being dissolved in water, under the condition of the same pH value, the corrosivity of a carbon dioxide aqueous solution is stronger than that of hydrochloric acid, the service life of a material possibly caused by carbon dioxide corrosion is greatly shorter than the design life, and the early corrosion failure of equipment is an important factor threatening the production safety. Therefore, studying the characteristics of carbon dioxide corrosion and taking appropriate control measures is of great importance for safe production.
Because the harm of carbon dioxide corrosion is large, a protection method aiming at carbon dioxide corrosion also becomes the key point of research of people, the corrosion protection method commonly used at present mainly adopts corrosion-resistant materials, coating protection and corrosion inhibitor filling, wherein the corrosion inhibitor filling is one of the methods indispensable for carbon dioxide corrosion protection, and the corrosion inhibitor filling is usually needed while the corrosion-resistant materials and the coating are adopted for protection, so that the effectiveness of corrosion protection is effectively improved.
The corrosion inhibitor is used as an important means for preventing carbon dioxide corrosion, the corrosion protection performance of the corrosion inhibitor directly reflects the corrosion protection effect, the corrosion inhibitor is various at present, evaluation and screening of the performance of a corrosion inhibitor are necessary for different working conditions, the corrosion inhibitor is preferably used, meanwhile, the development of a novel corrosion inhibitor is also necessary to evaluate and screen the performance, and higher requirements are provided for the evaluation and screening of the performance of the corrosion inhibitor from the economical efficiency of production and the convenience of filling the corrosion inhibitor.
Common corrosion inhibitor evaluation methods include high-temperature high-pressure dynamic and static coupon test methods, electrochemical test methods and the like, wherein the coupon test method can obtain the average corrosion inhibition efficiency within a certain test period, the test period is long, the operation is complex, and time and labor are wasted; the electrochemical test method can quickly obtain the corrosion inhibition efficiency, but has poor accuracy and cannot be used for real-time online monitoring for a longer period.
Since carbon dioxide corrosion is influenced by many factors, it is necessary to control the influence factors such as temperature, oxygen content, and carbon dioxide introduction rate when evaluating the corrosion inhibitor.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an evaluation corrosion inhibitor is to metal material inhibition performance's online monitoring test device.
In order to achieve the above object, the utility model provides an online monitoring test device includes:
the corrosion inhibitor testing device comprises a medium environment simulation device for simulating a medium environment applied by a corrosion inhibitor, a deoxygenation device for deoxygenating a solution and injecting the solution under pressure, a linear polarization resistance probe for monitoring the corrosion rate, a ventilation device for continuously introducing nitrogen or carbon dioxide gas in the testing process and a corrosion inhibitor injection device for different concentrations;
wherein:
the medium environment simulation device consists of a container, a sealing cover and a temperature control module, wherein a heating sleeve is wound outside the container, the sealing cover is provided with a probe jack, a liquid pressing pipe and a vent pipe which share a three-way pipe, an air outlet pipe, a corrosion inhibitor filling port and a temperature sensor jack, and all the interfaces are hermetically connected;
the sealing cover is hermetically connected with the container through the sealing ring and the fastening chuck;
the probe, the temperature sensor and the corrosion inhibitor container are connected with corresponding interfaces on the sealing cover;
the deaerator is connected with the container through a liquid pressing pipe;
the heating jacket and the temperature sensor are respectively connected to a temperature controller.
In the online monitoring test device, all the interfaces are hermetically connected through tapered threads.
In the online monitoring test device, the probe is a linear polarization resistance probe.
In the on-line monitoring test device, the medium environment simulation device is a glass container.
In the on-line monitoring test device, the sealing cover is connected with the glass container in a sealing way through the O-shaped sealing rings and the four fastening chucks.
In the online monitoring test device, the sealing cover is provided with an air outlet pipe connected to the water seal to prevent external air from being sucked backwards.
In the on-line monitoring test device, a corrosion inhibitor filling device is respectively provided with a corrosion inhibitor deoxidizing valve and a corrosion inhibitor deoxidizing gas outlet which are used for deoxidizing the corrosion inhibitor.
The utility model discloses an online monitoring test device carries out the experimental method of online monitoring, its step is:
1) pulling a hydraulic valve to a hydraulic pipe, deoxidizing the solution by using nitrogen or carbon dioxide gas, and deoxidizing the glass container;
2) after the oxygen content is reduced to a target value, the three-way valve is pulled to the direction of the vent pipe, and nitrogen or carbon dioxide is introduced into the glass container through the vent device to remove air in the vent pipe;
3) pulling the hydraulic valve to the direction of the hydraulic pipe, and pressing the solution into the glass container;
4) pulling the hydraulic valve to the direction of the vent pipe, and continuously introducing test gas to make bubbles in the solution emerge;
5) heating the test solution by a heating sleeve, controlling the temperature by a temperature sensor, and starting to record test data after the temperature reaches a target value;
6) the independent deoxygenation of the corrosion inhibitor is realized through a corrosion inhibitor filling device, the corrosion inhibitor is added into the glass container through a valve, the corrosion rate under different corrosion inhibitor concentrations is monitored, and the performance evaluation and screening of the corrosion inhibitor are carried out.
The utility model discloses a LPR (linear polarization resistance) probe technique carries out the monitoring of corrosion rate, can realize real-time on-line monitoring to can adjust the corrosion inhibitor filling, and react corrosion rate rapidly, be an important replenishment to the performance evaluation and the screening of corrosion inhibitor.
Drawings
Fig. 1 is a schematic structural diagram of a schematic principle of an online monitoring test device for evaluating corrosion inhibition performance of a corrosion inhibitor on metal material steel according to an embodiment of the invention.
Fig. 2 is a data diagram of the corrosion rate monitoring data after the blank test and the corrosion inhibitor filling carried out by the experimental device.
Description of the reference numerals
1, a deaerating tank and an oxygen content monitoring device; 2 a glass container; 3, sealing the cover; 4, an air outlet; 5, a stirrer; 6 heating a sleeve; 7 a temperature controller; 8, a thermocouple; 9 a hydraulic valve; 10 a test gas; 11 a probe; 12 a data recorder; 13 a corrosion inhibitor container; 14 corrosion inhibitor filling valve; 15 corrosion inhibitor oxygen removal valve; 16, deoxidizing and exhausting the air outlet by using the corrosion inhibitor; 17 test solution deoxygenated buffer tank.
Detailed Description
The utility model discloses an evaluation corrosion inhibitor includes to metal material steel inhibition performance's online monitoring test device: the device comprises a medium environment simulation device for simulating a medium environment applied to the corrosion inhibitor, a deoxygenation tank and an oxygen content monitoring device for deoxygenating a solution and injecting the solution under pressure, an LPR probe for monitoring the corrosion rate, an aeration device for continuously introducing carbon dioxide gas in the test process and a corrosion inhibitor injection device for different concentrations.
According to the utility model discloses evaluation corrosion inhibitor is to metal material inhibition performance's on-line monitoring test device, optionally, medium environmental simulation device comprises glass container, sealed lid and temperature controller, and sealed covering is provided with LPR probe jack, pressure liquid pipe and the shared three-way pipe of breather pipe, outlet duct, corrosion inhibitor filler and temperature sensor jack, and the interface all is through toper screw thread sealing connection everywhere.
According to the utility model discloses evaluation corrosion inhibitor is to metal material inhibition performance's online monitoring test device, optionally, sealed lid passes through O type circle and four fastening chucks and glass container sealing connection.
According to the utility model discloses evaluation corrosion inhibitor is to metal material inhibition performance's online monitoring test device, optionally, with LPR probe, temperature sensor and corrosion inhibitor container and the sealed corresponding interface zonulae occludens that covers.
According to the utility model discloses evaluation corrosion inhibitor is to metal material inhibition performance's on-line monitoring test device, optionally, the deaerating plant passes through the pressure liquid pipe and links to each other with the glass container.
According to the utility model discloses evaluation corrosion inhibitor is to online monitoring test device of metal material inhibition performance, optionally, pulls the hydraulic valve to the hydraulic pipe, utilizes gases such as nitrogen gas or carbon dioxide to carry out the deoxidization to solution, carries out the deoxidization to glass container simultaneously.
According to the utility model discloses evaluation corrosion inhibitor is to metal material inhibition performance's online monitoring test device, optionally, is connected to the outlet duct of sealed lid to the water seal, prevents outside air suck-back.
According to the utility model discloses evaluation corrosion inhibitor is to metal material inhibition performance's on-line monitoring test device, optionally, pulls the hydraulic valve to the breather pipe direction after oxygen content reaches the target value, lets in nitrogen gas or carbon dioxide through breather device in to the glass container and detach the air in the breather pipe.
According to the utility model discloses evaluation corrosion inhibitor is to metal material inhibition performance's online monitoring test device, optionally, pulls the hydraulic valve to the hydraulic pipe direction, impresses 1L solution in to the glass container.
According to the utility model discloses evaluation corrosion inhibitor is to metal material inhibition performance's on-line monitoring test device, optionally, pulls the liquid valve door to the breather pipe direction, continues to let in test gas, guarantees to have the foaming to slowly emerge in the solution.
According to the utility model discloses evaluation corrosion inhibitor is to metal material inhibition performance's on-line monitoring test device, optionally, heats test solution and carries out temperature control with temperature sensor through the heating jacket, begins the record of test data after the temperature reaches the target value.
According to the utility model discloses evaluation corrosion inhibitor is to metal material inhibition performance's on-line monitoring test device, optionally, can realize the individual deoxidization of corrosion inhibitor through corrosion inhibitor filling device to can add a certain amount of corrosion inhibitor in to the glass container through the valve, monitor the corrosion rate under the different corrosion inhibitor concentration, carry out corrosion inhibitor performance evaluation and screening.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical method of the embodiments of the present invention. Obviously, the described embodiments are some embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without creative efforts based on the described embodiments of the present invention belong to the protection scope of the present invention.
Unless defined otherwise, technical or scientific terms used herein shall be defined as commonly understood by one of ordinary skill in the art to which this invention belongs.
According to the embodiment of the utility model provides an on-line monitoring evaluation method of corrosion inhibitor to metal material inhibition performance in the different corrosion medium environment of simulation, oxygen content through deaerator control corrosion medium, the solution after the process fluid pressure valve with the deoxidization is impressed environment analogue means, then utilize aeration system to let in carbon dioxide gas in succession to test solution, utilize heating module control test solution temperature, utilize LPR probe or other electrochemistry test method monitoring corrosion rate in the testing process, utilize corrosion inhibitor to annotate and the deoxidization module adds the corrosion inhibitor after the deoxidization in the test solution system, through the inhibition efficiency of monitoring corrosion rate data evaluation different concentration corrosion inhibitors. Thereby evaluating and screening the corrosion inhibitor and the effective adding concentration of the corrosion inhibitor.
The principle for evaluating the corrosion inhibition efficiency of the corrosion inhibitor is that an LPR probe or other electrochemical testing methods are used for continuously monitoring the corrosion rate, and the corrosion inhibition efficiency of the corrosion inhibitors with different concentrations is calculated by comparing the corrosion rate of a blank group with the corrosion rate of the corrosion inhibitors with different concentrations.
Fig. 1 is a schematic structural diagram of a schematic structure of an online monitoring test device for evaluating corrosion inhibition performance of a corrosion inhibitor on a metal material according to an embodiment of the present invention.
As shown in fig. 1, the on-line monitoring test device for evaluating corrosion inhibitor to corrosion inhibition performance of metal material of the embodiment of the present invention includes: the corrosion inhibitor filling device comprises an environment simulation module, a corrosion rate monitoring module and a corrosion inhibitor filling module.
Specifically, the environmental simulation module includes oxygen-eliminating tank and oxygen content monitoring devices 1, glass container 2, sealed lid 3, gas outlet 4, agitator 5, heating jacket 6, temperature controller 7, thermocouple 8, hydraulic valve 9, test gas 10, test solution deoxidization buffer tank 17.
The corrosion rate monitoring module comprises an LPR probe 11 and a data memory 12.
The corrosion inhibitor filling module comprises a corrosion inhibitor container 13, a corrosion inhibitor filling valve 14, a corrosion inhibitor oxygen removal valve 15 and a corrosion inhibitor oxygen removal air outlet 16.
2 outsides of glass container twine has heating jacket 6, and the temperature measurement end of temperature sensor (thermocouple) gets into inside the solution through the preformed hole that corresponds on the sealing cover, then heating jacket 6 is connected to temperature controller 7 with thermocouple 8 simultaneously, heats the solution in glass container 2 through temperature controller 7 control heating jacket 6, and simultaneously, thermocouple 8 monitoring solution temperature carries out feedback control heating process, realizes the temperature control of test solution. The stirrer 5 is used for stirring the solution in the glass container 2.
And the carbon dioxide vent valve controls an external carbon dioxide gas source to introduce carbon dioxide gas into the test solution, so that the carbon dioxide gas inside the solution is saturated, and the gas is kept continuously introduced in the test process.
The corrosion rate monitoring module is mainly used for monitoring the corrosion rate in real time through the LPR probe or other monitoring probes, observing the change of the corrosion rate through the data display, and storing data through the data storage device so as to facilitate the subsequent drawing of a change curve of the corrosion rate and time or the concentration of the corrosion inhibitor.
The corrosion inhibitor filling module realizes the deoxidization of the corrosion inhibitor and continuously fills the corrosion inhibitor into the environment simulation medium, and researches the corrosion inhibition efficiency of the corrosion inhibitors with different concentrations.
During testing, a deoxygenation tank with a solution and an oxygen content monitoring device 1, a corrosion inhibitor container 13, a temperature controller 7 and a probe 11 for corrosion test are connected with a glass container 2 and a sealing cover 3, then test gas or nitrogen enters the glass container 2 through the deoxygenation tank and a liquid pressing valve 9, then enters a buffer solution tank 17 through a gas outlet 4 until the test gas or nitrogen is discharged to the outside, deoxygenation is performed on the test solution and the glass container for 2 hours, then a certain amount of deoxygenated test solution is pressed into the glass container, the liquid pressing valve is switched to continuously introduce the test gas into the test solution through a test gas source 10, and the test gas is continuously introduced during the testing process, meanwhile, the temperature controller 7 is started to set to the temperature required by the test to start temperature rise, and after the temperature reaches the temperature required by the test, the test probe 11 starts to record test data, and (3) as blank test data, after monitoring for a certain time, performing corrosion inhibitor filling, opening a corrosion inhibitor filling valve 14, filling a certain amount of corrosion inhibitor into the test solution from a corrosion inhibitor container by using test gas, then continuously monitoring corrosion test data, and analyzing the corrosion inhibition efficiency of the corrosion inhibitor and the change rule of the corrosion inhibition efficiency by comparing the test data after the corrosion inhibitor is filled for multiple times with the blank test data. Data processing is performed by the data storage 12. The corrosion inhibitor container 13 is respectively provided with a corrosion inhibitor oxygen removal valve 15 and a corrosion inhibitor oxygen removal air outlet 16 for carrying out oxygen removal treatment on the corrosion inhibitor.
Examples
The test conditions are as follows: temperature 75 ℃ test solution 193500ppm Cl-The test material is X65 pipeline steel, and the corrosion inhibitor that awaits measuring indicates with 1#, and corrosion inhibitor test concentration is 50ppm, the utility model discloses experimental apparatus test time is 24h, and traditional lacing film method test time is 72 h.
The utility model discloses corrosion rate monitoring data after the blank test that experimental apparatus developed and the filling corrosion inhibitor is shown as figure 2, and corrosion rate in the blank solution is about 10mpy, adds behind 50ppm corrosion inhibitor 1#, and corrosion rate reduces gradually, and later stable is about 0.9 mpy.
The results of the conventional coupon test are shown in Table 1, and the corrosion rate after adding the corrosion inhibitor is 0.884 mpy.
Two kinds of test method results are close, but the utility model discloses the device can show continuous corrosion rate variation process, experimental operation is simple, and test cycle is short, and traditional lacing film is experimental, and the test process is more loaded down with trivial details, and experimental cycle is long to can only show the last result, can not embody the variation process after the corrosion inhibitor adds notes, consequently the utility model discloses the device has obvious advantage in the aspect of carrying out corrosion inhibitor performance evaluation sample.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, it is not limited to the present invention, and any skilled person in the art can make some modifications or equivalent embodiments without departing from the scope of the present invention, but all the technical matters of the present invention are within the scope of the present invention.
TABLE 1 conventional coupon test results
Claims (7)
1. An on-line monitoring test device for evaluating corrosion inhibition performance of a corrosion inhibitor is characterized by comprising:
the corrosion inhibitor testing device comprises a medium environment simulation device for simulating a medium environment applied by a corrosion inhibitor, a deoxygenation device for deoxygenating a solution and injecting the solution under pressure, a linear polarization resistance probe for monitoring the corrosion rate, a ventilation device for continuously introducing nitrogen or carbon dioxide gas in the testing process and a corrosion inhibitor injection device for different concentrations;
wherein:
the medium environment simulation device consists of a container, a sealing cover and a temperature control module, wherein a heating sleeve is wound outside the container, the sealing cover is provided with a probe jack, a liquid pressing pipe and a vent pipe which share a three-way pipe, an air outlet pipe, a corrosion inhibitor filling port and a temperature sensor jack, and all the interfaces are hermetically connected;
the sealing cover is hermetically connected with the container through the sealing ring and the fastening chuck;
the probe, the temperature sensor and the corrosion inhibitor container are connected with corresponding interfaces on the sealing cover;
the deaerator is connected with the container through a liquid pressing pipe;
the heating jacket and the temperature sensor are respectively connected to a temperature controller.
2. The on-line monitoring test device for evaluating the corrosion inhibition performance of the corrosion inhibitor according to claim 1, wherein all interfaces are hermetically connected through tapered threads.
3. The on-line monitoring test device for evaluating corrosion inhibition performance of the corrosion inhibitor according to claim 1, wherein the probe is a linear polarization resistance probe.
4. The on-line monitoring test device for evaluating the corrosion inhibition performance of the corrosion inhibitor according to claim 1, wherein the medium environment simulation device is a glass container.
5. The on-line monitoring test device for evaluating the corrosion inhibition performance of the corrosion inhibitor according to claim 1, wherein the sealing cover is connected with the glass container in a sealing way through O-shaped sealing rings and four fastening chucks.
6. The on-line monitoring test device for evaluating the corrosion inhibition performance of the corrosion inhibitor according to claim 1, wherein the sealing cover is provided with an air outlet pipe connected to a water seal for preventing external air from being sucked backwards.
7. The on-line monitoring test device for evaluating the corrosion inhibition performance of the corrosion inhibitor according to claim 1, wherein a corrosion inhibitor deoxidizing valve and a corrosion inhibitor deoxidizing gas outlet for deoxidizing the corrosion inhibitor are respectively arranged on the corrosion inhibitor filling device.
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| CN201921926116.2U CN211347876U (en) | 2019-11-07 | 2019-11-07 | On-line monitoring test device for evaluating corrosion inhibition performance of corrosion inhibitor |
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| CN201921926116.2U CN211347876U (en) | 2019-11-07 | 2019-11-07 | On-line monitoring test device for evaluating corrosion inhibition performance of corrosion inhibitor |
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