CN110823975A - Device and method for measuring corrosion parameters of metal material by polarization method - Google Patents
Device and method for measuring corrosion parameters of metal material by polarization method Download PDFInfo
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Abstract
The invention provides a device and a method for measuring corrosion parameters of a metal material by adopting a polarization method, and relates to the technical field of measurement of the corrosion parameters of the metal material. The device comprises a detection device, a voltage-stabilized power supply, a voltage control module, a current acquisition module, a signal conversion module and a computer; the detection device comprises a constant temperature device, a research electrode and an auxiliary electrode; the research electrode and the auxiliary electrode are arranged in a constant temperature device; the research electrode is connected with the voltage control module; the auxiliary electrode is connected with the current acquisition module; the voltage control module is connected with the current acquisition module, the current acquisition module is connected with the signal conversion module, and the signal conversion module is connected with the computer; the voltage-stabilizing power supply is respectively connected with the voltage control module, the current acquisition module and the signal conversion module. The device is simple and convenient to manufacture and measure, can polarize a plurality of test pieces simultaneously, and measures the corrosion parameters of the test pieces.
Description
Technical Field
The invention relates to the technical field of metal material corrosion parameter measurement, in particular to a device and a method for measuring a metal material corrosion parameter by adopting a polarization method.
Background
In engineering practice, corrosion of metal materials is often considered, and the corrosion parameters of metal materials are the most important parameters for researching metal corrosion. The method for measuring the corrosion parameters of the metal at the present stage mainly comprises a weight loss method, a method for measuring the quality of corrosion loss of the metal material in unit time and a corrosion pit method, a method for observing the number, the depth and the polarization of corrosion pits on the surface of the metal material in unit time, and a method for measuring the corrosion parameters of the metal material in real time by using an electrochemical method;
since part of the metal material is not easy to corrode, the corrosion parameters of the metal material are measured by a weight loss method or a corrosion pit method, a long experimental test piece is needed, the measured corrosion parameters are average corrosion parameters within a period of time, and the corrosion parameters of the metal material cannot be obtained quickly and in real time. The polarization method is an electrochemical measuring method, and when the metal material is subjected to electrochemical corrosion, the method can quickly and accurately obtain real-time corrosion parameters of the metal material. Furthermore, when the traditional polarization method is used for determining the corrosion parameters of the metal materials, only one metal sample can be measured every time one measurement is carried out. The determination efficiency is low and the experimental conditions of the metal material in each measurement can not be guaranteed to be completely consistent.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a device and a method for measuring the corrosion parameters of the metal material by adopting a polarization method, aiming at the defects of the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
on one hand, the invention provides a device for measuring corrosion parameters of metal materials by adopting a polarization method, which comprises a detection device, a voltage-stabilized power supply, a voltage control module, a current acquisition module, a signal conversion module and a computer, wherein the detection device is connected with the voltage-stabilized power supply;
the detection device comprises a constant temperature device, a research electrode and an auxiliary electrode; the research electrode and the auxiliary electrode are arranged in a constant temperature device; the research electrode is connected with the voltage control module; the auxiliary electrode is connected with the current acquisition module; the voltage control module is connected with the current acquisition module, the output end of the current acquisition module is connected with the input end of the signal conversion module, and the output end of the signal conversion module is connected with the input end of the computer;
the output end of the voltage-stabilized power supply is respectively connected with the input end of the voltage control module, the input end of the current acquisition module and the input end of the signal conversion module.
N research electrodes and n auxiliary electrodes can be simultaneously arranged in the detection device according to experimental needs.
The constant temperature device can store liquid and keep the temperature of the liquid constant.
On the other hand, the invention provides a method for measuring the corrosion parameters of the metal material by adopting a polarization method, which is realized by adopting a device for measuring the corrosion parameters of the metal material by adopting the polarization method, and comprises the following steps:
step 1: setting the temperature of a solution with preset ion concentration in a constant temperature device, placing a research electrode and an auxiliary electrode in the constant temperature device, and keeping the research electrode corroded at constant temperature;
step 2: setting the output voltage of the voltage control module to enable the research electrode to be polarized under the voltage, and enabling the current formed by electrons generated by corrosion transfer of the research electrode to flow into the current acquisition module through the auxiliary electrode;
and step 3: the current acquisition module converts the acquired current through the signal conversion module to form a digital signal, and outputs the digital signal to the computer, and the computer displays a real-time polarization curve of the research electrode and stores the data and the real-time polarization curve; in the strong polarization region, the polarization value can be taken as a straight line to the logarithm of the polarization current, the straight line is called Tafel straight line, and the slope b of the anode Tafel is respectively obtained from the slope of the straight lineaAnd cathode Tafel slope bc(ii) a The current value corresponding to the intersection point of the extension lines of the Tafel straight lines of the cathode and the anode is the corrosion current density icorr；
And 4, step 4: according to corrosion current density icorrObtaining the corrosion rate of the metal in the research electrode, namely the corrosion parameter; the specific formula is as follows:
in the formula, vMedicine for treating chronic hepatitis BIs the corrosion rate, mm/a; m is the relative atomic mass of the metal atom; i is corrosion current, A; n is the number of lost electrons of the metal; s is the working area of the metal electrode in cm2(ii) a Rho is the density of the metal material, g/cm2。
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the invention provides a device and a method for measuring corrosion parameters of a metal material by adopting a polarization method, and the device has the following beneficial effects:
1. the device adopts distributed acquisition module to have a plurality of collection passageways, consequently can polarize a plurality of test pieces simultaneously, measures the corruption parameter of a plurality of test pieces. The collecting efficiency can be effectively improved in the process of simultaneously collecting a plurality of test pieces, and the condition that the corrosion temperature and the solution ion concentration change in the process of repeated measurement can be effectively avoided, so that the relative corrosion performance of the plurality of test pieces can be measured more accurately.
2. The computer acquisition program in the device for measuring the corrosion parameters of the metal material by the polarization method capable of realizing multipoint simultaneous measurement not only can store the data measured by the polarization method, but also can read the data, and can perform preliminary analysis on the measured data.
3. The device of the invention uses the acquisition module, not only can more reliably and stably output the preset polarization voltage, but also can omit a reference electrode in the traditional three-electrode measurement system, so the device also has the characteristics of simple and convenient manufacture and measurement.
Drawings
FIG. 1 is a schematic view of an apparatus for measuring corrosion parameters of a metal material according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method provided by an embodiment of the present invention;
FIG. 3 is a schematic view of a computer operating interface according to an embodiment of the present invention;
FIG. 4 is a schematic view of a detection apparatus according to an embodiment of the present invention;
wherein: 1-constant temperature device, 2-auxiliary electrode, 3-research electrode, 4-solution.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The method of this example is as follows.
In one aspect, the present invention provides a device for measuring corrosion parameters of a metal material by using a polarization method, as shown in fig. 1, the device comprises a detection device, a voltage-stabilized power supply, a voltage control module, a current collection module, a signal conversion module, and a computer;
the detection device is shown in fig. 4 and comprises a constant temperature device 1, a research electrode 3 and an auxiliary electrode 2; the research electrode 3 and the auxiliary electrode 2 are arranged in the constant temperature device 1; the research electrode 3 is connected with the voltage control module; the auxiliary electrode 2 is connected with the current acquisition module; the voltage control module 4 is connected with the current acquisition module, the output end of the current acquisition module is connected with the input end of the signal conversion module, and the output end of the signal conversion module is connected with the input end of the computer;
the output end of the voltage-stabilized power supply is respectively connected with the input end of the voltage control module, the input end of the current acquisition module and the input end of the signal conversion module.
The detection device comprises a constant temperature device 1, a research electrode 3 and an auxiliary electrode 2; the research electrode 3 and the auxiliary electrode 2 are arranged in the constant temperature device 1; the research electrode 3 is connected with the voltage control module; the auxiliary electrode 2 is connected with the current acquisition module.
N research electrodes and n auxiliary electrodes can be simultaneously arranged in the detection device according to experimental needs, so that the research electrodes, the auxiliary electrodes, the voltage control module and the current acquisition module form n loops.
The thermostat 1 can store liquid and keep the temperature of the liquid constant.
The voltage control module in this embodiment employs DAM3060V for outputting a constant voltage to ensure polarization of the metal within a predetermined voltage interval; the current collection module adopts DAM3058R and is used for collecting current formed by electrons transferred by electrochemical corrosion of metal; the two modules comprise a plurality of interfaces, and each interface can measure one test piece, so that the device can realize the acquisition of the corrosion parameters of a plurality of test pieces under the same condition.
The constant temperature device adopts a constant temperature water bath box with adjustable temperature and is used for controlling the temperature of a corrosive solution when metal is corroded;
the electrical components in the device are electrically connected with an external main controller and 220V mains supply, and the main controller can be a conventional known device controlled by a computer and the like.
In another aspect, the present invention provides a method for measuring corrosion parameters of a metal material by using a polarization method, which is implemented by using an apparatus for measuring corrosion parameters of a metal material by using a polarization method, as shown in fig. 2, and comprises the following steps:
step 1: setting the temperature of a solution with preset ion concentration in a constant temperature device 1, placing a research electrode 3 and an auxiliary electrode 2 in the constant temperature device, and keeping the research electrode corroded at constant temperature;
step 2: setting the output voltage of the voltage control module to enable the research electrode 3 to be polarized under the voltage, and enabling the current formed by the electrons generated by corrosion transfer of the research electrode 3 to flow into the current acquisition module through the auxiliary electrode 2;
and step 3: the current acquisition module converts the acquired current through the signal conversion module to form a digital signal, and outputs the digital signal to the computer, and the computer displays the real-time polarization curve of the research electrode 3 and stores the data and the real-time polarization curve. The current acquisition module converts the acquired current through the signal conversion module to form a digital signal, and outputs the digital signal to a computer which displays the digital signalResearching a real-time polarization curve of the electrode, and storing the data and the real-time polarization curve; in the strong polarization region, the polarization value can be taken as a straight line to the logarithm of the polarization current, the straight line is called Tafel straight line, and the slope b of the anode Tafel is respectively obtained from the slope of the straight lineaAnd cathode Tafel slope bc(ii) a The current value corresponding to the intersection point of the extension lines of the Tafel straight lines of the cathode and the anode is the corrosion current density icorr；
And 4, step 4: according to corrosion current density icorrObtaining the corrosion rate of the metal in the research electrode, namely the corrosion parameter; the specific formula is as follows:
in the formula, vMedicine for treating chronic hepatitis BIs the corrosion rate, mm/a; m is the relative atomic mass of the metal atom; i is corrosion current, A; n is the number of lost electrons of the metal; s is the working area of the metal electrode in cm2(ii) a Rho is the density of the metal material, g/cm2。
Further, the program in the computer is developed by autonomous programming, and as shown in fig. 3, the main program display interface can be divided into a curve display setting area, a collection operation area, a collection file operation area and a curve real-time display area; the curve display setting area sequence is used for selecting the curve display type; the acquisition operation area is used for checking the circuit connection condition, the transmission state of the acquisition module, setting a polarization interval and the voltage change rate, checking whether the circuit connection of the whole measurement system is complete and good, and carrying out polarization measurement if the connection is good; the file operation area is used for storing and reading acquired data; and the curve real-time display area is used for displaying the polarization curve in real time.
To sum up, the polarization method that the multiple spot was measured simultaneously measures metal material corrosion parameter device, during the use, earlier carry out certain preliminary treatment (polishing, side seal etc.) with the measurement test piece, the test piece that awaits measuring after the preliminary treatment is put into constant temperature equipment 1 that has been disposed certain concentration, put through constant voltage power supply, click the connecting device in the computer, system prompt equipment connects well back, click the parameter initialization button in the computer, set up the polarization voltage of waiting to test the piece, single-computer click the start collection in the computer after polarization voltage sets up, carry out polarization data acquisition, can single-computer pause in the acquisition process and gather the button, follow-up single-computer continues to gather can, click the storage data after collection program suggestion is ended and can store the collection data, obtain required polarization curve data. Note that: the contact area between the test piece and the solution in the constant temperature device is kept constant in the process of carrying out polarization measurement on the test piece.
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 or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions and scope of the present invention as defined in the appended claims.
Claims (4)
1. A device for measuring corrosion parameters of metal materials by adopting a polarization method is characterized in that: the device comprises a detection device, a voltage-stabilized power supply, a voltage control module, a current acquisition module, a signal conversion module and a computer;
the detection device comprises a constant temperature device, a research electrode and an auxiliary electrode; the research electrode and the auxiliary electrode are arranged in a constant temperature device; the research electrode is connected with the voltage control module; the auxiliary electrode is connected with the current acquisition module; the voltage control module is connected with the current acquisition module, the output end of the current acquisition module is connected with the input end of the signal conversion module, and the output end of the signal conversion module is connected with the input end of the computer;
the output end of the voltage-stabilized power supply is respectively connected with the input end of the voltage control module, the input end of the current acquisition module and the input end of the signal conversion module.
2. The apparatus for measuring the corrosion parameter of the metal material by the polarization method according to claim 1, wherein: n research electrodes and n auxiliary electrodes can be simultaneously arranged in the detection device according to experimental needs.
3. The apparatus for measuring the corrosion parameter of the metal material by the polarization method according to claim 1, wherein: the constant temperature device can store liquid and keep the temperature of the liquid constant.
4. A method for measuring corrosion parameters of a metallic material by polarization, which is implemented by the apparatus for measuring corrosion parameters of a metallic material by polarization according to claim 1, wherein: the method comprises the following steps:
step 1: setting the temperature of a solution with preset ion concentration in a constant temperature device, placing a research electrode and an auxiliary electrode in the constant temperature device, and keeping the research electrode corroded at constant temperature;
step 2: setting the output voltage of the voltage control module to enable the research electrode to be polarized under the voltage, and enabling the current formed by electrons generated by corrosion transfer of the research electrode to flow into the current acquisition module through the auxiliary electrode;
and step 3: the current acquisition module converts the acquired current through the signal conversion module to form a digital signal, and outputs the digital signal to the computer, and the computer displays a real-time polarization curve of the research electrode and stores the data and the real-time polarization curve; in the strong polarization region, the polarization value can be taken as a straight line to the logarithm of the polarization current, the straight line is called Tafel straight line, and the slope b of the anode Tafel is respectively obtained from the slope of the straight lineaAnd cathode Tafel slope bc(ii) a The current value corresponding to the intersection point of the extension lines of the Tafel straight lines of the cathode and the anode is the corrosion current density icorr；
And 4, step 4: according to corrosion current density icorrObtaining the corrosion rate of the metal in the research electrode, namely the corrosion parameter; the specific formula is as follows:
in the formula, vMedicine for treating chronic hepatitis BIs the corrosion rate, mm/a; m is the relative atomic mass of the metal atom; i is corrosion current, A; n is the number of lost electrons of the metal; s is the working area of the metal electrode in cm2(ii) a Rho is the density of the metal material, g/cm2。
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| CN115110083A (en) * | 2022-05-27 | 2022-09-27 | 国家石油天然气管网集团有限公司 | Long-distance pipeline instantaneous corrosion rate testing device based on cathodic protection |
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| CN115110083A (en) * | 2022-05-27 | 2022-09-27 | 国家石油天然气管网集团有限公司 | Long-distance pipeline instantaneous corrosion rate testing device based on cathodic protection |
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