CN114235675A - Corrosion monitoring system and method for engine exhaust system - Google Patents
Corrosion monitoring system and method for engine exhaust system Download PDFInfo
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Abstract
The application provides a system and a method for monitoring corrosion of an engine exhaust system, wherein the method comprises the following steps: receiving a coupling instruction and responding to the coupling instruction; the coupling instruction is that all working electrodes in the corrosion monitoring probe are coupled through a high-speed change-over switch in the array electrode electrochemical measurement and control system; the corrosion monitoring probe is arranged on the test section pipeline; at intervals of a first preset time, aiming at each working electrode of each corrosion monitoring probe, carrying out high-speed scanning on the coupling potential and the coupling current of the working electrode to obtain a scanning result of the coupling potential and a scanning result of the coupling current; the scanning result of the coupling potential and the scanning result of the coupling current are used for representing the dynamic change information of the condensed water on the surface of the corrosion monitoring probe; the dynamic change information comprises the precipitation state of the liquid phase on the surface of the corrosion monitoring probe, the precipitation state of the liquid phase on the surface of the corrosion monitoring probe and the acceleration condition of the corrosion rate of the corrosion monitoring probe. Thereby accurately obtaining the corrosion rate of the engine exhaust system.
Description
Technical Field
The application relates to the technical field of corrosion monitoring, in particular to a system and a method for monitoring corrosion of an engine exhaust system.
Background
In the case of frequent engine start/stop, exhaust gas may be condensed due to temperature reduction, causing corrosion of the exhaust system. The service environment of the discharge system is usually a heterogeneous corrosion environment with coexistent gas phase (waste gas), liquid phase (condensed water) and solid phase (particulate matter).
Existing corrosion monitoring techniques mainly include resistive probe (ER) techniques and linearly polarized probe (LPR) techniques. The resistance probe is based on the fact that the resistance of the probe is in direct proportion to the corrosion of metal, and the corrosion rate of the metal is obtained by monitoring the resistance change of the probe. Because the resistance is greatly influenced by the temperature, a reference test piece needs to be introduced into the resistance probe for temperature compensation, so that the complexity of the probe is increased, in addition, the monitoring sensitivity is influenced by the size of the probe, in order to improve the monitoring precision, a filiform probe is often adopted, the service life of the filiform probe is short, the filiform probe needs to be frequently replaced, and the resistance probe is not suitable for long-term monitoring. The linear polarization probe technology has rapid response and high synchronism of data acquisition, but the technology is only suitable for a liquid phase system with enough volume and good conductivity.
Disclosure of Invention
In view of this, the present application provides a system and a method for monitoring corrosion of an engine exhaust system, which can accurately obtain a corrosion rate of the engine exhaust system.
The present application provides in a first aspect an engine exhaust system corrosion monitoring system comprising:
the system comprises a corrosion monitoring probe, a traditional electrochemical test system and an array electrode electrochemical measurement and control system;
the array electrode electrochemical measurement and control system is connected with the corrosion monitoring probe and the traditional electrochemical test system;
wherein the corrosion monitoring probe comprises: the device comprises N three-electrode system units, a plurality of N three-electrode system units and a plurality of N active electrode system units, wherein each three-electrode system unit comprises a row of M micro working electrodes, two plate-shaped solid-state reference electrodes and two plate-shaped counter electrodes, the counter electrodes and the reference electrodes are symmetrically and parallelly arranged on two sides of the working electrode row, the micro working electrodes, the plate-shaped reference electrodes and the plate-shaped counter electrodes are isolated by high-temperature-resistant insulating materials, and two adjacent three-electrode system units share one counter electrode;
the array electrode electrochemical measurement and control system comprises: the system comprises a modularized hardware testing system and a visual software control system, wherein the modularized hardware testing system comprises a case, a controller, a high-speed change-over switch, a first digital multimeter, a second digital multimeter and a weak current amplifier; the visual software control system is compiled based on a LabVIEW graphical programming language;
the conventional electrochemical test system includes an electrochemical workstation including a working electrode terminal, a reference electrode terminal, and a counter electrode terminal.
Optionally, the reference electrode of the corrosion detection probe is made of duplex stainless steel, a high-purity zinc plate or a solid silver/silver chloride electrode; the counter electrode is made of a platinum sheet, platinum-plated titanium or ruthenium-plated titanium; the high-temperature-resistant insulating coating is made of fluororubber, varnish, three-proofing paint, methyl-oil glue or epoxy resin.
Optionally, before the test, at least three corrosion monitoring probes are respectively and radially installed in the electrode installation holes on the top, the bottom and the side wall of the test section pipeline.
Optionally, the high-speed transfer switch is a field effect transistor switch based on a PXI bus and configured in a one-line (X +1) column X (Y +1) row matrix, and the number of row channels or column channels of the field effect transistor switch matches the number N of three-electrode system units and the number M of micro-working electrodes: the number of column channels R0 to RX (X +1) ≧ 4, and the number of row channels C0 to CY (Y +1) ≧ 3N +1+ M).
The application provides a corrosion monitoring method for an engine exhaust system, which is characterized in that the method is applied to the corrosion monitoring system for the engine exhaust system, and comprises the following steps:
receiving a coupling instruction and responding to the coupling instruction; the coupling instruction is that all working electrodes in the corrosion monitoring probe are coupled through a high-speed change-over switch in the array electrode electrochemical measurement and control system; wherein, the corrosion monitoring probe is arranged on a test section pipeline;
at intervals of a first preset time, aiming at each working electrode of each corrosion monitoring probe, carrying out high-speed scanning on the coupling potential and the coupling current of the working electrode to obtain a scanning result of the coupling potential and a scanning result of the coupling current; the scanning result of the coupling potential and the scanning result of the coupling current are used for representing the dynamic change information of the condensed water on the surface of the corrosion monitoring probe; the dynamic change information comprises the precipitation state of the liquid phase on the surface of the corrosion monitoring probe, the precipitation state of the liquid phase on the surface of the corrosion monitoring probe and the acceleration condition of the corrosion rate of the corrosion monitoring probe.
Optionally, the method for monitoring corrosion of an engine exhaust system further includes:
determining a working electrode in the region of interest according to the corrosion rate of the test section pipeline in a multiphase system; wherein the multi-phase system comprises a gas phase, a liquid phase, and a solid phase;
monitoring potential noise and current noise of the working electrode in the region of interest within a second preset time;
and determining the corrosion type and the noise resistance according to the potential noise and the current noise of the working electrode in the region of interest, and calculating the corrosion rate of the working electrode in the region of interest.
Optionally, the method for monitoring corrosion of an engine exhaust system further includes:
receiving a first switching instruction and responding to the first switching instruction; wherein the first switching instruction is used for indicating to switch to an R0 column channel of the high-speed change-over switch and is connected with a working electrode terminal of the electrochemical workstation; the high-speed change-over switch couples all the reference electrodes in the corrosion monitoring probe and switches the reference electrodes to R1 channels of the high-speed change-over switch, and the high-speed change-over switch is connected with a reference electrode terminal of the electrochemical workstation; the high-speed change-over switch is used for coupling all counter electrodes in the corrosion monitoring probe and switching the counter electrodes to R2 channels of the high-speed change-over switch, and the high-speed change-over switch is connected with a counter electrode terminal of the electrochemical workstation;
receiving an open circuit potential monitoring instruction; the open-circuit potential electrical measurement instruction is triggered and started by direct current polarization test software of the electrochemical workstation, and the time required to be monitored is set;
and after the open-circuit potential is stabilized, performing a linear polarization resistance test and an electrochemical impedance spectrum test within the time needing to be monitored.
Optionally, the potential scan range of the linear polarization resistance test is ± 10mV relative to the open circuit potential, and the scan rate is 10 mV/h.
Optionally, the scanning frequency range of the electrochemical impedance spectroscopy test is 99.5kHz to 0.01Hz, and the disturbance signal is an alternating current sine wave with an amplitude within 20 mV.
Optionally, the method for monitoring corrosion of an engine exhaust system further includes:
receiving a second switching instruction and responding to the second switching instruction; the second switching instruction is used for instructing a high-speed change-over switch of the array electrode electrochemical measurement and control system to switch the working electrode in the region of interest in the corrosion monitoring probe to an R0 row channel of the high-speed change-over switch, and the working electrode is connected with a working electrode terminal of the electrochemical workstation; the high-speed change-over switch switches the first reference electrode and the second reference electrode in the region of interest in the corrosion monitoring probe to an R1 column channel of the high-speed change-over switch, and is connected with a reference electrode terminal of the electrochemical workstation; and the high-speed change-over switch switches the first pair of electrodes and the second pair of electrodes in the region of interest in the corrosion monitoring probe to R2 column channels of the high-speed change-over switch, and is connected with the counter electrode terminal of the electrochemical workstation.
According to the scheme, the corrosion monitoring system and the method for the engine exhaust system, provided by the application, comprise the following steps: receiving a coupling instruction and responding to the coupling instruction in the monitoring process; the coupling instruction is that all working electrodes in the corrosion monitoring probe are coupled through a high-speed change-over switch in the array electrode electrochemical measurement and control system; wherein, the corrosion monitoring probe is arranged on a test section pipeline; at intervals of a first preset time, aiming at each working electrode of each corrosion monitoring probe, carrying out high-speed scanning on the coupling potential and the coupling current of the working electrode to obtain a scanning result of the coupling potential and a scanning result of the coupling current; the scanning result of the coupling potential and the scanning result of the coupling current are used for representing the dynamic change information of the condensed water on the surface of the corrosion monitoring probe; the dynamic change information comprises the precipitation state of the liquid phase on the surface of the corrosion monitoring probe, the precipitation state of the liquid phase on the surface of the corrosion monitoring probe and the acceleration condition of the corrosion rate of the corrosion monitoring probe. Thereby achieving the purpose of accurately acquiring the corrosion rate of the engine exhaust system.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a three-electrode system unit (top view) according to an embodiment of the present disclosure;
FIG. 2 is a schematic illustration of a corrosion monitoring probe (top view) according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram illustrating a line connection status of a corrosion monitoring probe in a standby state according to an embodiment of the present disclosure;
FIG. 4 is a flow chart of a method for monitoring corrosion of an engine exhaust system according to an embodiment of the present disclosure;
FIGS. 5a-5c are schematic diagrams illustrating a connection status of a line for performing a coupling potential test according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram illustrating a connection state of a line for performing a coupling current test according to an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of a circuit connection state for performing an integrated electrochemical test according to an embodiment of the present disclosure;
fig. 8a to 8c are schematic views illustrating a connection state of a line for performing a local electrochemical test according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
It should be noted that the terms "first", "second", and the like, referred to in this application, are only used for distinguishing different devices, modules or units, and are not used for limiting the order or interdependence of functions performed by these devices, modules or units, but the terms "include", or any other variation thereof are intended to cover a non-exclusive inclusion, so that a process, method, article, or apparatus that includes a series of elements includes not only those elements but also other elements that are not explicitly listed, or includes elements inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiment of the application provides an engine exhaust system corrosion monitoring system, includes: a corrosion monitoring probe, a traditional electrochemical test system and an array electrode electrochemical measurement and control system.
The array electrode electrochemical measurement and control system is connected with the corrosion monitoring probe and the traditional electrochemical test system.
As shown in fig. 1, a schematic view of a corrosion monitoring probe is shown, which includes: the N three-electrode system units (the schematic diagram of a single three-electrode system unit is shown in fig. 2) comprise a row of M micro-working electrodes, two plate-shaped solid-state reference electrodes and two plate-shaped counter electrodes, the counter electrodes and the reference electrodes are symmetrically and parallelly arranged on two sides of the working electrode row, the micro-working electrodes, the plate-shaped reference electrodes and the plate-shaped counter electrodes are isolated by high-temperature-resistant insulating materials, and two adjacent three-electrode system units share one counter electrode.
Wherein 1 is a first pair of electrodes; 2 is a first reference electrode; 3 is a working electrode unit; 4 is a second reference electrode; 5 is a second pair of electrodes; 6 is a third reference electrode; 7 is a fourth reference electrode; 8 is a third pair of electrodes; 9 is a fifth reference electrode; 10 is a fourth pair of electrodes; and 11 is a sixth reference electrode.
Optionally, in another embodiment of the present application, the reference electrode of the corrosion detection probe is made of duplex stainless steel, a high-purity zinc plate, or a solid silver/silver chloride electrode; the counter electrode is made of a platinum sheet, platinum-plated titanium or ruthenium-plated titanium; the high-temperature resistant insulating coating is made of fluororubber, varnish, three-proofing paint, methyl-oil glue or epoxy resin.
Specifically, the preparation of the corrosion monitoring probe comprises the following steps:
a. preparing a plurality of metal wire microelectrodes with equal length and diameter not more than 1.0mm, wherein the metal wires can be made of the same metal material or different metal materials and are the same as the material of a measured discharge system pipe section, respectively polishing and cleaning the microelectrodes, firstly welding a lead at one end of each microelectrode, packaging a welding spot by using a heat-shrinkable pipe, then coating a high-temperature-resistant insulating coating on the outer surface of each microelectrode, and coating a second layer and a third layer after the first high-temperature-resistant insulating coating is naturally air-dried so as to prevent the microelectrodes from generating crevice corrosion and influencing a measurement result;
b. preparing a plurality of high-purity zinc plates and platinum-plated titanium plates with the thickness not more than 1.0mm, respectively polishing and cleaning a solid reference electrode plate and a counter electrode, firstly welding a lead at one end of the electrode, packaging a welding spot by using a heat-shrinkable tube, then coating a layer of high-temperature-resistant insulating coating on four side surfaces of the solid reference electrode plate and the counter electrode, and coating a second layer and a third layer of high-temperature-resistant insulating coating after the first layer of high-temperature-resistant insulating coating is naturally dried;
c. a series of metal wires prepared in the step a are arranged in a row in a close and orderly manner to form a working electrode array, the distance between any two adjacent metal wires is not more than 1.0mm, and two solid reference electrodes and two counter electrodes are respectively symmetrically, parallelly and tightly arranged at two sides of the working electrode array to form a group of three-electrode system units; the working electrode, the reference electrode and the counter electrode are isolated by a high-temperature-resistant insulating material, and two adjacent groups of three-electrode system units share one counter electrode. And a plurality of groups of three-electrode system units are used as corrosion monitoring probes for standby after insulation packaging, polishing, cleaning and drying.
The method can be widely applied to a corrosion electrochemical research system of the same metal material and the dissimilar metal material in a homogeneous and heterogeneous medium system, can accurately acquire electrochemical information such as corrosion rate of the metal and the like under the conditions that a solid-phase medium exists in the system, a high-impedance coating exists on the surface of the metal, and liquid phase in the pipeline is precipitated unevenly, can synchronously monitor and acquire the corrosion rates of different parts of the pipeline under different condensation conditions such as the top, the bottom and the side wall of the pipeline, has high test efficiency, and can save test resources of an engine rack.
It should be noted that in another embodiment of the present application, at least three corrosion monitoring probes are radially mounted in the electrode mounting holes in the top, bottom and side walls of the test section pipe, respectively, prior to testing. Considering that corrosion is a slow process, in order to save resources, the system is only subjected to corrosion monitoring at a set time point, and the monitoring system is in a standby state in other time periods. FIG. 3 is a schematic diagram of the line connection status of the corrosion monitoring probe in the standby state.
The array electrode electrochemical measurement and control system comprises: the modularized hardware testing system comprises a case, a controller, a high-speed change-over switch, a first digital multimeter, a second digital multimeter and a weak current amplifier; the visualization software control system is written based on LabVIEW graphical programming language.
Optionally, in another embodiment of the present application, the high-speed transfer switches are field effect transistor switches based on the PXI bus line, which are arranged in a one-line (X +1) column X (Y +1) row matrix, and the number of row channels or column channels of the field effect transistor switches matches with the number N of three-electrode system cells and the number M of micro-working electrodes: the number of column channels R0 to RX (X +1) ≧ 4, and the number of row channels C0 to CY (Y +1) ≧ 3N +1+ M).
It should be noted that the high-speed transfer switch may be implemented by, but not limited to, a field effect transistor switch or a multiplexer switch based on the PXI/PXIe bus.
The high-speed change-over switch is used for coupling all working electrodes of the corrosion monitoring probe, or selecting a certain working electrode independently to obtain electrochemical information of a local position, or selecting a working electrode, a counter electrode and a reference electrode of a certain three-electrode system unit in the corrosion monitoring probe independently. The first digital multimeter is used for measuring the coupling potential of the corrosion monitoring probe, and the second digital multimeter is used for measuring the coupling current of the corrosion monitoring probe. The visual software control system has a data processing function and is used for processing data such as current, voltage, resistance, current noise, potential noise, noise resistance and the like.
A conventional electrochemical test system includes an electrochemical workstation including a working electrode terminal, a reference electrode terminal, and a counter electrode terminal.
The electrochemical workstation can be any commercially available specification and model, including Solartron Analytical, Princeton applied Research, AutoLab, Gamry, Zennium, Ivium, CorrTest, IMe/6e series, CHI series, PG series, PINE AF series and other product series or various models.
Also, the electrochemical workstation may be one electrochemical workstation having multiple channels or a plurality of electrochemical workstations.
Specifically, the high-speed transfer switch respectively switches the working electrode, the counter electrode and the reference electrode of the three-electrode system unit to different rows of channels of the high-speed transfer switch, and is respectively connected with a working electrode terminal, a counter electrode terminal and a reference electrode terminal of the electrochemical workstation.
It should be noted that the high-speed change-over switch can couple all the working electrodes in the corrosion monitoring probe and is connected with the working electrode terminal of the electrochemical workstation; the high-speed change-over switch couples all counter electrodes in the corrosion monitoring probe and is connected with a counter electrode terminal of the electrochemical workstation; and the high-speed change-over switch couples all the reference electrodes in the corrosion monitoring probe and is connected with the reference electrode terminal of the electrochemical workstation, so that electrochemical test is carried out to obtain the statistical average corrosion rate of the corrosion monitoring probe.
Furthermore, the high-speed change-over switch couples one or more three-electrode system units in the corrosion monitoring probe, and connects the corresponding working electrode, counter electrode and reference electrode with the working electrode terminal, counter electrode terminal and reference electrode terminal of the electrochemical workstation respectively, and performs the fixed-point electrochemical test to obtain the local corrosion rate of a certain position on the corrosion monitoring probe.
It should be noted that, in the specific implementation process of the present application, the conventional electrochemical test system and the array electrode electrochemical measurement and control system may be used for separate testing or may be used for coupled testing.
It should be further noted that, in the specific implementation process of the present application, the area of the counter electrode in the corrosion monitoring probe of the corrosion monitoring system provided by the present application is much larger than the area of the working electrode, and the counter electrode is symmetrically placed on both sides of the working electrode, so that the power lines and the current distribution on the surface of the working electrode are more uniform, the preparation method of the corrosion monitoring probe is simple, and the scale can be flexibly selected according to the monitoring area; the distance between the reference electrode and the working electrode is small, the liquid junction potential of the system is small, and the electrochemical measurement precision is higher; the working electrode, the counter electrode and the reference electrode are insulated and symmetrically and closely arranged, so that the phenomenon that a three-electrode system does not form a loop due to uneven precipitation of a liquid phase, an electrochemical workstation is burnt down due to the fact that the system is broken when an electrochemical test is carried out can be avoided, and the reliability of test equipment is guaranteed.
According to the scheme, the corrosion monitoring system for the engine exhaust system comprises: the system comprises a corrosion monitoring probe, a traditional electrochemical test system and an array electrode electrochemical measurement and control system; the array electrode electrochemical measurement and control system is connected with the corrosion monitoring probe and the traditional electrochemical test system; wherein, corrosion monitoring probe includes: the device comprises N three-electrode system units, wherein each three-electrode system unit comprises a row of M micro working electrodes, two plate-shaped solid-state reference electrodes and two plate-shaped counter electrodes, the counter electrodes and the reference electrodes are symmetrically and parallelly arranged on two sides of the working electrode row, the micro working electrodes, the plate-shaped reference electrodes and the plate-shaped counter electrodes are isolated by high-temperature-resistant insulating materials, and two adjacent three-electrode system units share one counter electrode; the array electrode electrochemical measurement and control system comprises: the modularized hardware testing system comprises a case, a controller, a high-speed change-over switch, a first digital multimeter, a second digital multimeter and a weak current amplifier; the visual software control system is compiled based on a LabVIEW graphical programming language; a conventional electrochemical test system includes an electrochemical workstation including a working electrode terminal, a reference electrode terminal, and a counter electrode terminal. The corrosion state of the engine exhaust system is monitored by a corrosion monitoring probe, a traditional electrochemical test system and an array electrode electrochemical measurement and control system.
Another embodiment of the present application provides a method for monitoring corrosion of an engine exhaust system, as shown in fig. 4, which is applied to a system for monitoring corrosion of an engine exhaust system, and includes:
s401, receiving a coupling instruction and responding to the coupling instruction.
Wherein, the coupling instruction is to couple all working electrodes in the corrosion monitoring probe through a high-speed change-over switch in the array electrode electrochemical measurement and control system; wherein, the corrosion monitoring probe is arranged on the pipeline of the test section.
S402, carrying out high-speed scanning on the coupling potential and the coupling current of each working electrode of each corrosion monitoring probe at intervals of first preset time to obtain a scanning result of the coupling potential and a scanning result of the coupling current.
Wherein, the scanning result of the coupling potential and the scanning result of the coupling current are used for representing the dynamic change information of the condensed water on the surface of the corrosion monitoring probe; the dynamic change information comprises the precipitation state of the liquid phase on the surface of the corrosion monitoring probe, the precipitation state of the liquid phase on the surface of the corrosion monitoring probe and the acceleration condition of the corrosion rate of the corrosion monitoring probe.
The first preset time is set or changed by a technician or a related authorized person (for example, every 2 hours, 4 hours, 24 hours, etc.), and is not limited herein.
It should be further noted that, in the implementation of the present application, the working electrode of the corrosion monitoring probe may be placed at a place where monitoring is desired, such as the top, the bottom, the side wall, etc. of the test section pipeline, which is not limited herein.
Embodiments of the present application will now be described with reference to fig. 5a-5c, which are schematic diagrams illustrating the connection status of the lines for performing the coupling potential test.
Wherein V in the figure is a first digital multimeter, and A in the figure is a second digital multimeter. A first digital multimeter is used to measure the coupling potential of each working electrode in the corrosion monitoring probe. The low potential measuring terminal of the voltage input measuring terminals of the first digital multimeter is connected to the R1 column channels of the high-speed change-over switch, and the high potential measuring terminal is connected to the R0 column channels of the high-speed change-over switch. The working electrode of the corrosion monitoring probe is connected to the R0 column channel of the high-speed change-over switch, and the reference electrode of the corrosion monitoring probe is connected to the R1 column channel of the high-speed change-over switch by using the high-speed change-over switch.
Specifically, as shown in fig. 5a, when a first group of three-electrode system units are measured, the working electrodes of the first group of three-electrode system in the corrosion monitoring probe are sequentially connected to the R0 column channels of the high-speed change-over switch, and the first reference electrode and the second reference electrode of the corrosion monitoring probe are connected to the R1 column channels of the high-speed change-over switch; as shown in fig. 5b, when measuring the second group of three-electrode system units, the working electrodes of the second group of three-electrode system in the corrosion monitoring probe are sequentially connected to the R0 column channels of the high-speed change-over switch, and the third reference electrode and the fourth reference electrode of the corrosion monitoring probe are connected to the R1 column channels of the high-speed change-over switch; as shown in fig. 5c, when measuring the third group of three-electrode system units, the working electrodes of the third group of three-electrode system in the corrosion monitoring probe are sequentially connected to the R0 column channels of the high-speed change-over switch, and the fifth reference electrode and the sixth reference electrode of the corrosion monitoring probe are connected to the R1 column channels of the high-speed change-over switch. The precipitation state of the liquid phase on the surface of the corrosion monitoring probe can be preliminarily judged according to the result of the coupling potential.
In another embodiment of the present application, there may be a more preferable design, that is, the high-speed transfer switches are field effect transistor switches based on the PXI bus line and arranged in a line (X +1) column X (Y +1) row matrix, and the number of row channels or column channels of the field effect transistor switches corresponds to the number N of three-electrode system cells and the number M of micro-working electrodes: the number of column channels R0 to RX (X +1) ≧ 4, and the number of row channels C0 to CY (Y +1) ≧ 3N +1+ M).
Fig. 6 is a schematic diagram of a connection state of a circuit for performing a coupling current test. A second digital multimeter and a low current amplifier are used to measure the coupling current of each working electrode in the corrosion monitoring probe. Specifically, a high potential measuring end in voltage input measuring ends of the second digital multimeter is connected to a high potential output end of a voltage output end of the weak current amplifier, a low potential measuring end in voltage input measuring ends of the second digital multimeter is connected to a low potential output end of the voltage output end of the weak current amplifier, the high potential output end of the voltage input end of the weak current amplifier is connected to an R2 column channel of the high-speed change-over switch, and the low potential output end of the voltage input end of the weak current amplifier is connected to an R3 column channel of the high-speed change-over switch, namely, the current measurement is converted into the voltage measurement. During measurement, the working electrode to be measured is connected to the R2 column channel of the high-speed change-over switch in sequence, and the rest working electrodes are connected to the R3 column channel of the high-speed change-over switch. The precipitation state of the liquid phase on the surface of the corrosion monitoring probe and the acceleration condition of the corrosion rate of the corrosion monitoring probe can be judged according to the result of the coupling current.
In the practical application process of the present application, after obtaining the corrosion rate of the test section pipeline in a multiphase system (gas phase (waste gas, etc.), liquid phase (condensed water, etc.), solid phase (particulate matter, etc.), the method may further include:
and determining the working electrode in the region of interest according to the corrosion rate of the test section pipeline in the multiphase system.
Wherein the multiphase system comprises a gas phase, a liquid phase and a solid phase.
Potential noise and current noise of the working electrode within the region of interest are monitored for a second predetermined time.
Wherein, the second preset time is set and changed by a technician or related authorized personnel (for example, 512s, 1024s, 2048 hours and the like).
And determining the corrosion type and the noise resistance according to the potential noise and the current noise of the working electrode in the region of interest, and calculating the corrosion rate of the working electrode in the region of interest.
In the specific implementation process of the present application, the conventional electrochemical testing system includes an electrochemical workstation, and the high-speed transfer switch switches the working electrode, the reference electrode, and the counter electrode of the three-electrode system unit to R0, R1, and R2 row channels of the high-speed transfer switch, respectively, and connects with the working electrode terminal, the reference electrode terminal, and the counter electrode terminal of the electrochemical workstation, respectively, to perform an electrochemical test, so as to obtain a statistical average corrosion rate of the corrosion monitoring probe.
The electrochemical workstation(s) of (1) can be any commercially available specification type, including Solartron Analytical, Princeton Applied Research, AutoLab, Gamry, Zennium, Ivium, CorrTest, IMe/6e series, CHI series, PG series, and PINE AF series, or various types.
Optionally, in another embodiment of the present application, a method for monitoring corrosion of an engine exhaust system includes:
receiving a first switching instruction and responding to the first switching instruction.
Wherein the first switching instruction is used for indicating to switch to an R0 column channel of the high-speed change-over switch and is connected with a working electrode terminal of the electrochemical workstation; the high-speed change-over switch couples all the reference electrodes in the corrosion monitoring probe and switches the reference electrodes to R1 channels of the high-speed change-over switch, and the reference electrodes are connected with the reference electrode terminal of the electrochemical workstation; the high-speed change-over switch couples all the counter electrodes in the corrosion monitoring probe and switches the counter electrodes to an R2 column channel of the high-speed change-over switch, and the high-speed change-over switch is connected with a counter electrode terminal of the electrochemical workstation.
And receiving an open circuit potential monitoring command.
The open-circuit potential electrical measurement instruction is triggered and started by direct current polarization test software of the electrochemical workstation, and the time required to be monitored is set.
And after the open-circuit potential is stabilized, carrying out a linear polarization resistance test and an electrochemical impedance spectrum test within the time required to be monitored.
Alternatively, in another embodiment of the present application, the potential scan range of the linear polarization resistance test may be, but is not limited to ± 10mV with respect to the open circuit potential, with a scan rate of 10 mV/h; the scanning frequency range of the electrochemical impedance spectroscopy test can be, but is not limited to, 99.5kHz-0.01Hz, and the disturbance signal is an alternating current sine wave with the amplitude within 20mV, which is not limited herein.
An example of the present application will now be described with reference to fig. 7, which is a schematic diagram of the connection state of the lines for performing an integrated electrochemical test.
Wherein WE is a working electrode terminal of the electrochemical workstation, RE is a reference electrode terminal of the electrochemical workstation, and CE is a counter electrode terminal of the electrochemical workstation. Through the coupling of array electrode electrochemistry observing and controlling system and traditional electrochemistry test system, open circuit potential, linear polarization resistance and the electrochemistry impedance spectrum test of corroding monitor probe carry out, obtain among the heterogeneous medium system electrochemical information such as the statistics average corrosion rate of corroding monitor probe, its test flow is:
(1) all working electrodes in the corrosion monitoring probe are coupled and switched to R0 channels of the high-speed change-over switch by using the high-speed change-over switch of the array electrode electrochemical measurement and control system, and the working electrodes are connected with working electrode terminals of an electrochemical workstation; the high-speed change-over switch couples all the reference electrodes in the corrosion monitoring probe and switches the reference electrodes to R1 channels of the high-speed change-over switch, and the reference electrodes are connected with the reference electrode terminal of the electrochemical workstation; the high-speed change-over switch couples all the counter electrodes in the corrosion monitoring probe and switches the counter electrodes to an R2 column channel of the high-speed change-over switch, and the high-speed change-over switch is connected with a counter electrode terminal of the electrochemical workstation.
(2) And operating the direct current polarization test software of the electrochemical workstation, selecting the open-circuit potential, and monitoring the open-circuit potential after setting the time required to be monitored.
(3) And after the open-circuit potential is stable, carrying out linear polarization resistance test, wherein the potential scanning range is +/-10 mV relative to the open-circuit potential, and the scanning speed is 10 mV/h.
(4) And after the open-circuit potential is stabilized, carrying out electrochemical impedance spectrum test, wherein the scanning frequency range is 99.5kHz-0.01Hz, and the disturbance signal is an alternating current sine wave with the amplitude within 20 mV.
(5) The electrochemical workstation test software was shut down and the system was returned to the standby state shown in figure 3.
(6) Repeating steps (1) - (5) at the next test time point.
In the above test flow, the step (3) and the step (4) can be interchanged, and in the steps (3) and (4), the scanning range, the amplitude of the perturbation signal, the scanning rate, and the like can be set with different parameters according to different research systems. The corrosion rate is calculated by utilizing a Stern-Geary formula for the measured polarization resistance and impedance, and for a system with a coating, the corrosion rate can be calculated according to parameters such as time constant, characteristic frequency, coating capacitance, coating resistance, double electric layer capacitance, charge transfer resistance and the like of an electrochemical impedance spectrum, so that the service life of the coating is predicted.
Optionally, in another embodiment of the application, a local electrochemical test may be further performed, specifically including:
and receiving a second switching instruction and responding to the second switching instruction.
The second switching instruction is used for instructing a high-speed change-over switch of the array electrode electrochemical measurement and control system to switch the working electrode in the region of interest in the corrosion monitoring probe to an R0 row channel of the high-speed change-over switch and connect with a working electrode terminal of an electrochemical workstation; the high-speed change-over switch switches the first reference electrode and the second reference electrode in the region of interest in the corrosion monitoring probe to R1 column channels of the high-speed change-over switch, and is connected with a reference electrode terminal of the electrochemical workstation; the high-speed change-over switch switches the first pair of electrodes and the second pair of electrodes in the region of interest in the corrosion monitoring probe to R2 column channels of the high-speed change-over switch, and the high-speed change-over switch is connected with the counter electrode terminals of the electrochemical workstation.
An example of the present application will now be described with reference to fig. 8a-8c, which are schematic illustrations of the connection states of the lines for performing a localized electrochemical test.
Through the coupling of array electrode electrochemistry observing and controlling system and traditional electrochemistry test system, open circuit potential, linear polarization resistance and the electrochemistry impedance spectroscopy test of the region of interest on the corrosion monitoring probe are carried out, obtain the local corrosion rate of corrosion monitoring probe among the heterogeneous medium system electrochemical information such as, its test procedure is:
(1) as shown in fig. 8a, if the region of interest is located in the first group of three-electrode system units, the high-speed change-over switch of the array electrode electrochemical measurement and control system is used to switch the working electrode in the region of interest in the corrosion monitoring probe to the R0 row channel of the high-speed change-over switch, and is connected to the working electrode terminal of the electrochemical workstation; the high-speed change-over switch switches the first reference electrode and the second reference electrode in the region of interest in the corrosion monitoring probe to R1 column channels of the high-speed change-over switch, and is connected with a reference electrode terminal of the electrochemical workstation; the high-speed change-over switch switches the first pair of electrodes and the second pair of electrodes in the region of interest in the corrosion monitoring probe to R2 column channels of the high-speed change-over switch, and the high-speed change-over switch is connected with the counter electrode terminals of the electrochemical workstation. As shown in fig. 8b, if the region of interest is located in the second group of three-electrode system units, the high-speed change-over switch of the array electrode electrochemical measurement and control system is used to switch the working electrode in the region of interest in the corrosion monitoring probe to the R0 row channel of the high-speed change-over switch, and is connected to the working electrode terminal of the electrochemical workstation; the high-speed change-over switch switches a third reference electrode and a fourth reference electrode in the region of interest in the corrosion monitoring probe to R1 column channels of the high-speed change-over switch, and is connected with a reference electrode terminal of the electrochemical workstation; the high-speed change-over switch switches the second counter electrode and the third counter electrode in the region of interest in the corrosion monitoring probe to the R2 column channel of the high-speed change-over switch, and the high-speed change-over switch is connected with the counter electrode terminal of the electrochemical workstation. As shown in fig. 8c, if the region of interest is located in the third group of three-electrode system units, the high-speed change-over switch of the array electrode electrochemical measurement and control system is used to switch the working electrode in the region of interest in the corrosion monitoring probe to the R0 row channel of the high-speed change-over switch, and is connected to the working electrode terminal of the electrochemical workstation; the high-speed change-over switch switches a fifth reference electrode and a sixth reference electrode in the region of interest in the corrosion monitoring probe to R1 column channels of the high-speed change-over switch, and is connected with a reference electrode terminal of the electrochemical workstation; and the high-speed change-over switch switches the third counter electrode and the fourth counter electrode in the region of interest in the corrosion monitoring probe to an R2 column channel of the high-speed change-over switch, and is connected with a counter electrode terminal of the electrochemical workstation.
(2) And operating the electrochemical workstation testing software, selecting the open-circuit potential, and monitoring the open-circuit potential after setting the time required to be monitored.
(3) And after the open-circuit potential is stable, carrying out linear polarization resistance test, wherein the potential scanning range is +/-10 mV relative to the open-circuit potential, and the scanning speed is 10 mV/h.
(4) And after the open-circuit potential is stabilized, carrying out electrochemical impedance spectrum test, wherein the scanning frequency range is 99.5kHz-0.01Hz, and the disturbance signal is an alternating current sine wave with the amplitude within 20 mV.
(5) The electrochemical workstation test software was shut down and the system was returned to the standby state shown in figure 3.
(6) Repeating steps (1) - (5) at the next test time point.
In the above test flow, the step (3) and the step (4) can be interchanged, and in the steps (3) and (4), the scanning range, the amplitude of the perturbation signal, the scanning rate, and the like can be set with different parameters according to different research systems.
According to the scheme, the corrosion monitoring method for the engine exhaust system comprises the following steps: receiving a coupling instruction and responding to the coupling instruction in the monitoring process; wherein, the coupling instruction is to couple all working electrodes in the corrosion monitoring probe through a high-speed change-over switch in the array electrode electrochemical measurement and control system; wherein, the corrosion monitoring probe is arranged on the pipeline of the test section; at intervals of a first preset time, aiming at each working electrode of each corrosion monitoring probe, carrying out high-speed scanning on the coupling potential and the coupling current of the working electrode to obtain a scanning result of the coupling potential and a scanning result of the coupling current; wherein, the scanning result of the coupling potential and the scanning result of the coupling current are used for representing the dynamic change information of the condensed water on the surface of the corrosion monitoring probe; the dynamic change information comprises the precipitation state of the liquid phase on the surface of the corrosion monitoring probe, the precipitation state of the liquid phase on the surface of the corrosion monitoring probe and the acceleration condition of the corrosion rate of the corrosion monitoring probe. Thereby achieving the purpose of accurately acquiring the corrosion rate of the engine exhaust system.
In the above embodiments disclosed in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The apparatus and method embodiments described above are illustrative only, as the flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules in the embodiments of the present disclosure may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part. The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present disclosure may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a live broadcast device, or a network device) to execute all or part of the steps of the method according to the embodiments of the present disclosure. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Those skilled in the art can make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An engine exhaust system corrosion monitoring system, comprising:
the system comprises a corrosion monitoring probe, a traditional electrochemical test system and an array electrode electrochemical measurement and control system;
the array electrode electrochemical measurement and control system is connected with the corrosion monitoring probe and the traditional electrochemical test system;
wherein the corrosion monitoring probe comprises: the device comprises N three-electrode system units, a plurality of N three-electrode system units and a plurality of N active electrode system units, wherein each three-electrode system unit comprises a row of M micro working electrodes, two plate-shaped solid-state reference electrodes and two plate-shaped counter electrodes, the counter electrodes and the reference electrodes are symmetrically and parallelly arranged on two sides of the working electrode row, the micro working electrodes, the plate-shaped reference electrodes and the plate-shaped counter electrodes are isolated by high-temperature-resistant insulating materials, and two adjacent three-electrode system units share one counter electrode;
the array electrode electrochemical measurement and control system comprises: the system comprises a modularized hardware testing system and a visual software control system, wherein the modularized hardware testing system comprises a case, a controller, a high-speed change-over switch, a first digital multimeter, a second digital multimeter and a weak current amplifier; the visual software control system is compiled based on a LabVIEW graphical programming language;
the conventional electrochemical test system includes an electrochemical workstation including a working electrode terminal, a reference electrode terminal, and a counter electrode terminal.
2. The engine exhaust system corrosion monitoring system of claim 1, wherein the reference electrode of the corrosion detection probe is made of duplex stainless steel, high purity zinc plate, or solid silver/silver chloride electrode; the counter electrode is made of a platinum sheet, platinum-plated titanium or ruthenium-plated titanium; the high-temperature-resistant insulating coating is made of fluororubber, varnish, three-proofing paint, methyl-oil glue or epoxy resin.
3. The engine exhaust system corrosion monitoring system according to claim 1, wherein at least three of said corrosion monitoring probes are radially mounted within electrode mounting holes in the top, bottom and side walls of the test section pipe, respectively, prior to testing.
4. The engine exhaust system corrosion monitoring system of claim 1, wherein said high speed switches are PXI bus based field effect transistor switches arranged in a one-line (X +1) column X (Y +1) row matrix, with a number of row or column channels corresponding to the number N of three electrode system cells and the number M of micro-working electrodes: the number of column channels R0 to RX (X +1) ≧ 4, and the number of row channels C0 to CY (Y +1) ≧ 3N +1+ M).
5. The method for monitoring the corrosion of the engine exhaust system is characterized by being applied to the corrosion monitoring system of the engine exhaust system and comprising the following steps:
receiving a coupling instruction and responding to the coupling instruction; the coupling instruction is that all working electrodes in the corrosion monitoring probe are coupled through a high-speed change-over switch in the array electrode electrochemical measurement and control system; wherein, the corrosion monitoring probe is arranged on a test section pipeline;
at intervals of a first preset time, aiming at each working electrode of each corrosion monitoring probe, carrying out high-speed scanning on the coupling potential and the coupling current of the working electrode to obtain a scanning result of the coupling potential and a scanning result of the coupling current; the scanning result of the coupling potential and the scanning result of the coupling current are used for representing the dynamic change information of the condensed water on the surface of the corrosion monitoring probe; the dynamic change information comprises the precipitation state of the liquid phase on the surface of the corrosion monitoring probe, the precipitation state of the liquid phase on the surface of the corrosion monitoring probe and the acceleration condition of the corrosion rate of the corrosion monitoring probe.
6. The engine exhaust system corrosion monitoring method of claim 5, further comprising:
determining a working electrode in the region of interest according to the corrosion rate of the test section pipeline in a multiphase system; wherein the multi-phase system comprises a gas phase, a liquid phase, and a solid phase;
monitoring potential noise and current noise of the working electrode in the region of interest within a second preset time;
and determining the corrosion type and the noise resistance according to the potential noise and the current noise of the working electrode in the region of interest, and calculating the corrosion rate of the working electrode in the region of interest.
7. The engine exhaust system corrosion monitoring method of claim 5, further comprising:
receiving a first switching instruction and responding to the first switching instruction; wherein the first switching instruction is used for indicating to switch to an R0 column channel of the high-speed change-over switch and is connected with a working electrode terminal of the electrochemical workstation; the high-speed change-over switch couples all the reference electrodes in the corrosion monitoring probe and switches the reference electrodes to R1 channels of the high-speed change-over switch, and the high-speed change-over switch is connected with a reference electrode terminal of the electrochemical workstation; the high-speed change-over switch is used for coupling all counter electrodes in the corrosion monitoring probe and switching the counter electrodes to R2 channels of the high-speed change-over switch, and the high-speed change-over switch is connected with a counter electrode terminal of the electrochemical workstation;
receiving an open circuit potential monitoring instruction; the open-circuit potential electrical measurement instruction is triggered and started by direct current polarization test software of the electrochemical workstation, and the time required to be monitored is set;
and after the open-circuit potential is stabilized, performing a linear polarization resistance test and an electrochemical impedance spectrum test within the time needing to be monitored.
8. The engine exhaust system corrosion monitoring method of claim 7, wherein the linear polarization resistance test has a potential sweep range of ± 10mV relative to the open circuit potential and a sweep rate of 10 mV/h.
9. The engine exhaust system corrosion monitoring method of claim 7, wherein the electrochemical impedance spectroscopy test has a sweep frequency in the range of 99.5kHz to 0.01Hz and the perturbation signal is an ac sine wave with an amplitude within 20 mV.
10. The engine exhaust system corrosion monitoring method of claim 6, further comprising:
receiving a second switching instruction and responding to the second switching instruction; the second switching instruction is used for instructing a high-speed change-over switch of the array electrode electrochemical measurement and control system to switch the working electrode in the region of interest in the corrosion monitoring probe to an R0 row channel of the high-speed change-over switch, and the working electrode is connected with a working electrode terminal of the electrochemical workstation; the high-speed change-over switch switches the first reference electrode and the second reference electrode in the region of interest in the corrosion monitoring probe to an R1 column channel of the high-speed change-over switch, and is connected with a reference electrode terminal of the electrochemical workstation; and the high-speed change-over switch switches the first pair of electrodes and the second pair of electrodes in the region of interest in the corrosion monitoring probe to R2 column channels of the high-speed change-over switch, and is connected with the counter electrode terminal of the electrochemical workstation.
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