CN114216841A - Electrochemical evaluation device and method for protection effect of anti-rust oil film layer on bearing surface - Google Patents
Electrochemical evaluation device and method for protection effect of anti-rust oil film layer on bearing surface Download PDFInfo
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 title claims abstract description 90
- 238000011156 evaluation Methods 0.000 title claims abstract description 41
- 230000000694 effects Effects 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 90
- 239000010959 steel Substances 0.000 claims abstract description 90
- 238000005260 corrosion Methods 0.000 claims abstract description 77
- 230000007797 corrosion Effects 0.000 claims abstract description 76
- 238000004088 simulation Methods 0.000 claims abstract description 60
- 239000002131 composite material Substances 0.000 claims abstract description 42
- 238000001453 impedance spectrum Methods 0.000 claims abstract description 36
- 230000001681 protective effect Effects 0.000 claims abstract description 35
- 230000008859 change Effects 0.000 claims abstract description 15
- 238000012545 processing Methods 0.000 claims abstract description 12
- 238000001179 sorption measurement Methods 0.000 claims abstract description 11
- 238000005259 measurement Methods 0.000 claims description 19
- 238000012546 transfer Methods 0.000 claims description 12
- 239000011521 glass Substances 0.000 claims description 7
- 229920001817 Agar Polymers 0.000 claims description 6
- 239000008272 agar Substances 0.000 claims description 6
- 238000004090 dissolution Methods 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 4
- 229910021607 Silver chloride Inorganic materials 0.000 claims description 3
- ZOMNIUBKTOKEHS-UHFFFAOYSA-L dimercury dichloride Chemical class Cl[Hg][Hg]Cl ZOMNIUBKTOKEHS-UHFFFAOYSA-L 0.000 claims description 3
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 claims description 3
- 230000007480 spreading Effects 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 7
- 238000003860 storage Methods 0.000 abstract description 7
- 230000003449 preventive effect Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 238000000157 electrochemical-induced impedance spectroscopy Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
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- 238000002360 preparation method Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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Abstract
The invention relates to an electrochemical evaluation device and method for the protective effect of an anti-rust oil film layer on the surface of a bearing, wherein the device comprises a three-electrode system unit, an electrochemical workstation and a data processing unit which are sequentially connected; the three-electrode system unit comprises an electrolytic cell, a bearing steel sample and antirust oil film layer composite electrode, an auxiliary electrode, a salt bridge and a reference electrode. The electrochemical workstation is used for measuring an open circuit potential signal and an electrochemical impedance spectrum signal of the bearing steel sample and the anti-rust oil film layer composite electrode in the corrosion simulation solution; the data processing unit comprises a processor and an impedance spectrum equivalent circuit model fitting module, and is used for performing equivalent circuit model fitting on the electrochemical impedance spectrum signal to obtain electrochemical parameters of the constant phase angle element reflecting the surface adsorption capacity. The method is suitable for evaluating the protection effect of different types of antirust oil film layers on the surface of the bearing in the storage/transportation/service process and evaluating the influence of the change of the corrosion environment on the protection effect of the antirust oil film layers, and has the characteristic of time saving.
Description
Technical Field
The invention belongs to the technical field of environmental corrosion evaluation, and relates to an electrochemical evaluation device and method for the protection effect of an anti-rust oil film layer on the surface of a bearing.
Background
Due to the influence of water vapor, oxygen, acid, alkali, salt, carbide and other substances in the surrounding environment, the bearing surface can generate physical and chemical changes in the processes of storage, transportation and use to generate a paint rust phenomenon, so that the uniformity and the integrity of the surface state of the bearing are influenced, and the stability, the precision and the service life of the bearing in the service process are further influenced. The coating of the antirust oil film layer is one of the common protection means for isolating the surface of the bearing from the surrounding corrosive environment, and is also the most direct and economic protection means. However, the protection effect of different types of antirust oil film layers on the bearing is different, and the antirust oil film layers show different protection effects due to the change of the corrosion environment. The traditional method for evaluating the protective effect of the antirust oil film layer mainly comprises a damp-heat test, a salt spray test and a lamination test, but the evaluation methods have the defect of time consumption and cannot accurately reflect the influence of different corrosion environments on the protective effect of the same antirust oil film layer, so that the evaluation result is often inconsistent with the actual protective effect of the antirust oil film layer on the surface of the bearing in the corrosion environment. Therefore, the development of the device and the method for evaluating the protection effect of the anti-rust oil film layer on the surface of the bearing, which are time-saving, quick and high in sensitivity, is of great significance.
Disclosure of Invention
In order to solve the technical problems, the invention provides an electrochemical evaluation device and method for the protection effect of an anti-rust oil film layer on the surface of a bearing, which are suitable for evaluating the protection effects of different types of anti-rust oil film layers on the surface of the bearing in the processes of storage, transportation and service and evaluating the influence of corrosion environment change on the protection effect of the anti-rust oil film layer, and have the characteristics of high sensitivity, time saving and high efficiency.
The invention provides an electrochemical evaluation device for the protection effect of an anti-rust oil film layer on the surface of a bearing, which comprises the following components: the system comprises a three-electrode system unit, an electrochemical workstation and a data processing unit, wherein the three-electrode system unit is connected with the electrochemical workstation, and the electrochemical workstation is connected with the data processing unit;
the three-electrode system unit includes: the device comprises an electrolytic cell, a bearing steel sample and antirust oil film layer composite electrode, an auxiliary electrode, a salt bridge and a reference electrode; the electrolytic bath is filled with corrosion simulation solution, the bearing steel sample, the anti-rust oil film layer composite electrode and the auxiliary electrode are arranged in the corrosion simulation solution and are connected with the electrochemical workstation through leads, one end of the salt bridge is arranged in the corrosion simulation solution, and the other end of the salt bridge is connected with the electrochemical workstation through a reference electrode;
the electrochemical workstation is used for measuring an open-circuit potential signal and an electrochemical impedance spectrum signal of the bearing steel sample and the antirust oil film layer composite electrode in a corrosion simulation solution in real time;
the data processing unit includes: the processor and the impedance spectrum equivalent circuit model fitting module; the processor is used for recording and displaying the open-circuit potential signal and the electrochemical impedance spectrum signal in real time; the impedance spectrum equivalent circuit model fitting module is used for performing equivalent circuit model fitting on the measured electrochemical impedance spectrum signal to obtain electrochemical parameters of the constant phase angle element reflecting the surface adsorption capacity.
In the electrochemical evaluation device for the protective effect of the anti-rust oil film layer on the surface of the bearing, the electrolytic cell is a transparent glass cylindrical container; the volume of the corrosion simulation solution is not less than 2/3 of the volume of the electrolytic cell.
In the electrochemical evaluation device for the protective effect of the anti-rust oil film layer on the surface of the bearing, the bearing steel sample and the anti-rust oil film layer composite electrode are arranged in the corrosion simulation solution, and are led out of a reserved opening at the top end of an electrolytic cell through a lead to be connected to the input end of a working electrode of an electrochemical workstation; the auxiliary electrode is arranged in the corrosion simulation solution and is led out of a reserved opening at the top end of the electrolytic cell through a lead to be connected to the input end of the auxiliary electrode of the electrochemical workstation; one end of the salt bridge is arranged in the corrosion simulation solution through a notch reserved on the side surface of the electrolytic cell, and the other end of the salt bridge is exposed in the air environment around the electrolytic cell and is connected to the reference electrode through a saturated KCl solution; the reference electrode is connected to the reference electrode input of the electrochemical workstation.
In the electrochemical evaluation device for the protective effect of the anti-rust oil film layer on the surface of the bearing, the bearing steel sample and anti-rust oil film layer composite electrode comprises: the device comprises an insulating part, a bearing steel sample and an anti-rust oil film layer; the bearing steel sample is wrapped and fixed in the insulating part, one end face of the bearing steel sample is a working face and is exposed out of the upper surface of the insulating part, the anti-rust oil film layer is flatly laid and covered on the working face of the bearing steel sample, and the area of the anti-rust oil film layer is not smaller than that of the working face of the bearing steel sample; a lead is led out from the non-working surface of the bearing steel sample and is connected with the input end of a working electrode of an electrochemical workstation; the flat spreading amount of the antirust oil film layer is 5-10 mu L/cm2。
In the electrochemical evaluation device for the protective effect of the anti-rust oil film layer on the surface of the bearing, the composite electrode of the bearing steel sample and the anti-rust oil film layer is placed in the corrosion simulation solution in a positive or inverted mode according to the density ratio of the anti-rust oil film layer to the corrosion simulation solution; when the density of the antirust oil film layer is greater than that of the corrosion simulation solution, the bearing steel sample and the antirust oil film layer composite electrode are just placed in the corrosion simulation solution, and the working surface of the bearing steel sample faces the top of the electrolytic cell; and when the density of the antirust oil film layer is less than that of the corrosion simulation solution, the bearing steel sample and the antirust oil film layer composite electrode are inverted in the corrosion simulation solution, and the working surface of the bearing steel sample faces the bottom of the electrolytic cell.
In the electrochemical evaluation device for the protective effect of the anti-rust oil film layer on the surface of the bearing, the auxiliary electrode has a single-side area larger than 4cm2The platinum sheet is led out of a reserved opening at the top end of the electrolytic cell through a lead and is connected with the input end of an auxiliary electrode of the electrochemical workstation.
In the electrochemical evaluation device for the protective effect of the anti-rust oil film layer on the surface of the bearing, the salt bridge is composed of a ox horn-shaped glass tube with the aperture of 1.5mm at one end and the aperture of 15mm at the other end and the length of 12-15cm and an inner solidified KCl-agar mixture.
In the electrochemical evaluation device for the protective effect of the anti-rust oil film layer on the surface of the bearing, the reference electrode is a saturated calomel electrode or an Ag/AgCl reference electrode.
In the electrochemical evaluation device for the protective effect of the anti-rust oil film layer on the surface of the bearing, provided by the invention, the salt bridge and the auxiliary electrode are both positioned on one side of the working surface of the bearing steel sample and the anti-rust oil film layer composite electrode, and the salt bridge is positioned between the auxiliary electrode and the bearing steel sample and the anti-rust oil film layer composite electrode and is not in contact with each other.
The invention also provides an electrochemical evaluation method for the protective effect of the anti-rust oil film layer on the surface of the bearing, which comprises the following steps:
(1) measuring the real-time open-circuit potential value of the bearing steel sample and the anti-rust oil film layer composite electrode in the corrosion simulation solution through an electrochemical workstation, recording and displaying the measured open-circuit potential value evolution result through a processor, and finishing the measurement when the drift amount of the open-circuit potential value is stabilized within +/-10 mV;
(2) after the open-circuit potential measurement is finished, the bearing steel sample and the anti-rust oil film layer composite electrode reach an electrochemical stable state in a corrosion simulation solution; the electrochemical workstation enters an electrochemical impedance spectrum measurement mode, the measurement frequency range is 100kHz-10mHz, and the disturbance signal is 10 mV; recording and displaying the measured electrochemical impedance spectrum evolution result through a processor;
(3) after the electrochemical impedance spectrum measurement is finished, performing equivalent circuit model fitting analysis on the measured electrochemical impedance spectrum through an impedance spectrum equivalent circuit model fitting module to obtain electrochemical parameters of a constant phase angle element reflecting the adsorption capacity of the antirust oil film layer and the surface of the bearing steel sample; meanwhile, obtaining a charge transfer resistance value reflecting the difficulty degree of the anodic dissolution reaction of the bearing steel sample substrate;
(4) according to the electrochemical parameter values and the charge transfer resistance values of the constant phase angle elements of the bearing steel sample in the corrosion simulation solution under the coverage of different anti-rust oil film layers obtained by the equivalent circuit model fitting, comparing the difference of the protection effects of the different anti-rust oil film layers on the bearing steel sample; and (3) according to the electrochemical parameter values and the charge transfer resistance values of the constant phase angle elements of the bearing steel sample in different corrosion simulation solutions under the condition that the same anti-rust oil film layer is obtained by fitting the equivalent circuit model, and comparing the influence of the corrosion environment change on the protection effect of the same anti-rust oil film layer.
Compared with the prior art, the electrochemical evaluation device and method for the protective effect of the anti-rust oil film layer on the surface of the bearing have at least the following advantages and beneficial effects:
(1) the electrochemical evaluation device for the protective effect of the anti-rust oil film layer on the surface of the bearing is suitable for evaluating the protective effect of different types of anti-rust oil film layers on the surface of the bearing in the storage/transportation/service process and evaluating the influence of the change of a corrosion environment on the protective effect of the anti-rust oil film layer;
(2) the electrochemical evaluation device for the protective effect of the anti-rust oil film layer on the surface of the bearing can prepare different corrosion simulation solutions according to the type and concentration change of environmental pollutants in the actual storage/transportation/service process, so that the evaluation of the protective effect of the anti-rust oil film layer on the surface of the bearing is closer to the real situation in the actual corrosion environment;
(3) the electrochemical evaluation device for the protective effect of the anti-rust oil film layer on the surface of the bearing has the advantages of simple structure, reliable experimental method, reasonable steps, strong operability, convenience and practicability;
(4) the electrochemical evaluation device for the protective effect of the anti-rust oil film layer on the surface of the bearing is suitable for evaluating the protective effect of different types of anti-rust oil film layers on the surface of the bearing in the storage/transportation/service process and evaluating the influence of the change of a corrosion environment on the protective effect of the anti-rust oil film layer, and has the characteristics of high sensitivity, time saving and high efficiency.
Drawings
FIG. 1 is a schematic view of an electrochemical evaluation apparatus for evaluating the protective effect of a rust preventive oil film layer on a bearing surface according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a composite electrode of the bearing steel sample and the antirust oil film layer in FIG. 1;
110-an electrolytic cell; 120-corrosion simulating solution; 130-bearing steel sample and antirust oil film layer composite electrode; 131-bearing steel samples; 132-rust-inhibiting oil film layer; 140-an insulator; 150-a working surface; 160-auxiliary electrodes; 170-salt bridge; 180-reference electrode; 190-wire; 210-an electrochemical workstation; 310-data processing unit.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in FIG. 1, the electrochemical evaluation apparatus for the protective effect of a rust preventive oil film layer on a bearing surface according to the present invention comprises: a three-electrode system unit, an electrochemical workstation 210 and a data processing unit 310. The three-electrode system unit is connected to the electrochemical workstation 210, and the electrochemical workstation 210 is connected to the data processing unit 310.
The three-electrode system unit includes: the device comprises an electrolytic cell 110, a bearing steel sample and antirust oil film layer composite electrode 130, an auxiliary electrode 160, a salt bridge 170 and a reference electrode 180. The electrolytic cell 110 is filled with a corrosion simulation solution 120, the bearing steel sample, the anti-rust oil film layer composite electrode 130 and the auxiliary electrode 160 are arranged in the corrosion simulation solution 120 and are connected with the electrochemical workstation 210 through a lead 190, one end of the salt bridge 170 is arranged in the corrosion simulation solution 120, and the other end of the salt bridge is connected with the electrochemical workstation 210 through a reference electrode 180.
The electrochemical workstation 210 is used for measuring the open-circuit potential signal and the electrochemical impedance spectrum signal of the bearing steel sample and the antirust oil film layer composite electrode 130 in the corrosion simulation solution 120 in real time. The data processing unit 310 includes: the device comprises a processor and an impedance spectrum equivalent circuit model fitting module. And the processor is used for recording and displaying the open-circuit potential signal and the electrochemical impedance spectrum signal in real time. And the impedance spectrum equivalent circuit model fitting module is used for performing equivalent circuit model fitting on the measured electrochemical impedance spectrum signal so as to obtain and display electrochemical parameters of the constant phase angle element reflecting the surface adsorption capacity.
As shown in fig. 1, the electrolytic cell 110 is a transparent glass cylindrical container, and different corrosion simulation solutions 120 are prepared according to the storage/transportation/service environment of the bearing and the types and concentrations of the pollutants contained in the bearing. The volume of the corrosion simulating solution 120 is not less than 2/3 of the volume of the electrolytic cell 110. The bearing steel sample and the antirust oil film layer composite electrode 130 are arranged in the corrosion simulation solution 120, and are led out of a reserved opening at the top end of the electrolytic cell through a lead 190 to be connected to the input end of the working electrode of the electrochemical workstation 210. The auxiliary electrode 160 is disposed in the corrosion simulation solution 120, and is led out of the top reserved opening of the electrolytic cell through a lead 190 to be connected to the input end of the auxiliary electrode of the electrochemical workstation 210. One end of the salt bridge 170 is disposed in the corrosion simulation solution 120 through a notch reserved in the side surface of the electrolytic cell 110, and the other end is exposed in the air environment around the electrolytic cell and connected to the reference electrode 180 through a saturated KCl solution. The reference electrode 180 is connected to the reference electrode input of the electrochemical workstation 210.
As shown in fig. 2, the bearing steel sample and antirust oil film layer composite electrode 130 includes: an insulating member 140, a bearing steel sample 131, and a rust preventive oil film layer 132. The bearing steel sample 131 is wrapped and fixed in the insulating member 140, one end face of the bearing steel sample 131 is a working face 150, and the area of the working face is 1cm2The working surface 150 is exposed from the upper surface of the insulating member 140. The anti-rust oil film layer 132 is flatly laid on the working surface of the bearing steel sample 131, and the area of the anti-rust oil film layer 132 is not less than the area of the working surface 150 of the bearing steel sample 131. A lead wire 190 and a working electrode of the electrochemical workstation 210 are led out from any non-working surface of the bearing steel sample 131The input ends are connected. The flat spreading amount of the antirust oil film layer is 5-10 mu L/cm2Preferably, the maximum is not more than 15 mu L/cm2。
In specific implementation, the bearing steel sample and the anti-rust oil film layer composite electrode 130 are placed in the corrosion simulation solution 120 in a positive or inverted manner according to the density ratio of the anti-rust oil film layer 132 to the corrosion simulation solution 120. So as to prevent the rust preventive oil film layer 132 from being separated from the surface of the working surface 150 of the bearing steel sample 131 under the action of the buoyancy of the corrosion simulation solution 120. The specific setting mode is as follows: when the density of the rust preventive oil film layer 132 is greater than that of the corrosion simulation solution 120, the bearing steel sample and rust preventive oil film layer composite electrode 130 is placed in the corrosion simulation solution 120, and the working surface 150 of the bearing steel sample 131 faces the top of the electrolytic cell 110. When the density of the antirust oil film layer 132 is less than that of the corrosion simulation solution 120, the bearing steel sample and the antirust oil film layer composite electrode 130 are placed upside down in the corrosion simulation solution 120, and the working surface 150 of the bearing steel sample 131 faces the bottom of the electrolytic cell 110.
As shown in FIG. 1, the auxiliary electrode 160 has a single-sided area of more than 4cm2And is led out of the reserved opening at the top end of the electrolytic cell through a lead 190 and is connected with the input end of the auxiliary electrode of the electrochemical workstation 210. The salt bridge 170 is composed of a ox horn-shaped glass tube with an aperture of 1.5mm at one end and an aperture of 15mm at the other end and a length of 12-15cm and an inner solidified KCl-agar mixture. The preparation method of the KCl-agar comprises the following steps: heating 3g of agar and 97g of deionized water in a water bath until the agar and the deionized water are completely dissolved, then adding 30g of KCl, fully stirring, adding into a prepared horn-shaped glass tube by a dropper or siphon while the mixture is hot, and solidifying. The reference electrode 180 is a saturated calomel electrode or an Ag/AgCl reference electrode.
As shown in fig. 1, the salt bridge 170 and the auxiliary electrode 160 are both located at one side of the working surface 150 of the bearing steel sample and the antirust oil film composite electrode 130, and the salt bridge 170 is located between the auxiliary electrode 160 and the bearing steel sample and the antirust oil film composite electrode 130, and is not in contact with each other.
The electrochemical evaluation device for the protective effect of the anti-rust oil film layer on the surface of the bearing is used for electrochemical evaluation of the protective effect of the anti-rust oil film layer on the surface of the bearing, and relates to an electrochemical evaluation method for the protective effect, and the electrochemical evaluation method specifically comprises the following steps:
as shown in fig. 1, measuring the real-time open-circuit potential value of the bearing steel sample and the anti-rust oil film composite electrode 130 in the corrosion simulation solution 120 through the electrochemical workstation 210, recording and displaying the measured evolution result of the open-circuit potential value through the processor, and finishing the measurement when the drift amount of the open-circuit potential value is stabilized within +/-10 mV;
after the open-circuit potential measurement is finished, the bearing steel sample and the anti-rust oil film layer composite electrode 130 reach an electrochemical stable state in the corrosion simulation solution 120; the electrochemical workstation 210 enters an electrochemical impedance spectroscopy measurement mode, the measurement frequency range is 100kHz-10mHz, and the disturbance signal is 10 mV; recording and displaying the measured electrochemical impedance spectrum evolution result through a processor;
after the electrochemical impedance spectrum measurement is finished, performing equivalent circuit model fitting analysis on the measured electrochemical impedance spectrum through an impedance spectrum equivalent circuit model fitting module to obtain electrochemical parameters of a constant phase angle element reflecting the adsorption capacity of the antirust oil film layer and the surface of the bearing steel sample; meanwhile, obtaining a charge transfer resistance value reflecting the difficulty degree of the anodic dissolution reaction of the bearing steel sample substrate;
according to the electrochemical parameter values and the charge transfer resistances of the constant phase angle elements of the bearing steel sample in the corrosion simulation solution under the coverage of different anti-rust oil film layers obtained by the equivalent circuit model fitting, comparing the difference of the protection effects of the different anti-rust oil film layers on the bearing steel sample; and (3) according to the electrochemical parameter values and the charge transfer resistance values of the constant phase angle elements of the bearing steel sample in different corrosion simulation solutions under the condition that the same anti-rust oil film layer is obtained by fitting the equivalent circuit model, and comparing the influence of the corrosion environment change on the protection effect of the same anti-rust oil film layer.
The following are the design principles and concepts of the present invention:
(1) open circuit potential and electrochemical impedance spectrum are common electrochemical methods for evaluating the corrosion resistance of the organic coating and have the characteristic of nondestructive evaluation; according to the open-circuit potential measurement, the electrochemical stability of the bearing steel sample and the anti-rust oil film layer composite electrode in the corrosion simulation solution can be judged; according to the electrochemical impedance spectrum measurement, the change of the adsorption capacity of the anti-rust oil film layer on the surface of the bearing steel sample and the difficulty degree of the anodic dissolution reaction of the bearing steel sample can be judged.
(2) By utilizing the dipole characteristic of the oil-soluble corrosion inhibitor molecules in the anti-rust oil, the open-circuit potential measurement and the electrochemical impedance spectrum measurement of the bearing steel sample and the anti-rust oil film layer composite electrode 130 in the corrosion simulation solution 120 can be realized.
(3) By carrying out equivalent circuit model fitting analysis on the measured electrochemical impedance spectrum, the change of the adsorption capacitance value of the antirust oil film layer and the surface of the bearing steel sample and the change of the charge transfer resistance value of the bearing steel sample matrix during the anodic dissolution reaction can be obtained.
(4) According to the change of the adsorption capacitance value and the charge transfer resistance value of different anti-rust oil film layers on the surface of the bearing steel sample, the difference of the protection effect of the different anti-rust oil film layers on the bearing steel sample can be evaluated; according to the change of the adsorption capacitance value and the charge transfer resistance value of the same anti-rust oil film layer on the surface of the bearing steel sample in different corrosion simulation solutions, the influence of the corrosion environment change on the protection effect of the same anti-rust oil film layer can be evaluated.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, which is defined by the appended claims.
Claims (10)
1. Electrochemical evaluation device of rust-preventive oil film layer protective effect on bearing surface, which is characterized by comprising: the system comprises a three-electrode system unit, an electrochemical workstation and a data processing unit, wherein the three-electrode system unit is connected with the electrochemical workstation, and the electrochemical workstation is connected with the data processing unit;
the three-electrode system unit includes: the device comprises an electrolytic cell, a bearing steel sample and antirust oil film layer composite electrode, an auxiliary electrode, a salt bridge and a reference electrode; the electrolytic bath is filled with corrosion simulation solution, the bearing steel sample, the anti-rust oil film layer composite electrode and the auxiliary electrode are arranged in the corrosion simulation solution and are connected with the electrochemical workstation through leads, one end of the salt bridge is arranged in the corrosion simulation solution, and the other end of the salt bridge is connected with the electrochemical workstation through a reference electrode;
the electrochemical workstation is used for measuring an open-circuit potential signal and an electrochemical impedance spectrum signal of the bearing steel sample and the antirust oil film layer composite electrode in a corrosion simulation solution in real time;
the data processing unit includes: the processor and the impedance spectrum equivalent circuit model fitting module; the processor is used for recording and displaying the open-circuit potential signal and the electrochemical impedance spectrum signal in real time; the impedance spectrum equivalent circuit model fitting module is used for performing equivalent circuit model fitting on the measured electrochemical impedance spectrum signal to obtain electrochemical parameters of the constant phase angle element reflecting the surface adsorption capacity.
2. The electrochemical evaluation device for the protective effect of an anti-rust oil film layer on a bearing surface according to claim 1, wherein the electrolytic cell is a transparent glass cylindrical container; the volume of the corrosion simulation solution is not less than 2/3 of the volume of the electrolytic cell.
3. The electrochemical evaluation device for the protection effect of the anti-rust oil film layer on the bearing surface as claimed in claim 1, wherein the bearing steel sample and the anti-rust oil film layer composite electrode are arranged in the corrosion simulation solution, and are led out of a reserved opening at the top end of an electrolytic cell through a lead to be connected to the input end of a working electrode of the electrochemical workstation; the auxiliary electrode is arranged in the corrosion simulation solution and is led out of a reserved opening at the top end of the electrolytic cell through a lead to be connected to the input end of the auxiliary electrode of the electrochemical workstation; one end of the salt bridge is arranged in the corrosion simulation solution through a notch reserved on the side surface of the electrolytic cell, and the other end of the salt bridge is exposed in the air environment around the electrolytic cell and is connected to the reference electrode through a saturated KCl solution; the reference electrode is connected to the reference electrode input of the electrochemical workstation.
4. As claimed in claim 3The electrochemical evaluation device for the protection effect of the anti-rust oil film layer on the surface of the bearing is characterized in that the bearing steel sample and anti-rust oil film layer composite electrode comprises: the device comprises an insulating part, a bearing steel sample and an anti-rust oil film layer; the bearing steel sample is wrapped and fixed in the insulating part, one end face of the bearing steel sample is a working face and is exposed out of the upper surface of the insulating part, the anti-rust oil film layer is flatly laid and covered on the working face of the bearing steel sample, and the area of the anti-rust oil film layer is not smaller than that of the working face of the bearing steel sample; a lead is led out from the non-working surface of the bearing steel sample and is connected with the input end of a working electrode of an electrochemical workstation; the flat spreading amount of the antirust oil film layer is 5-10 mu L/cm2。
5. The electrochemical evaluation device for the protective effect of the rust-proof oil film layer on the bearing surface according to claim 4, wherein the composite electrode of the bearing steel sample and the rust-proof oil film layer is placed in the corrosion simulation solution in a positive or inverted manner according to the density ratio of the rust-proof oil film layer to the corrosion simulation solution; when the density of the antirust oil film layer is greater than that of the corrosion simulation solution, the bearing steel sample and the antirust oil film layer composite electrode are just placed in the corrosion simulation solution, and the working surface of the bearing steel sample faces the top of the electrolytic cell; and when the density of the antirust oil film layer is less than that of the corrosion simulation solution, the bearing steel sample and the antirust oil film layer composite electrode are inverted in the corrosion simulation solution, and the working surface of the bearing steel sample faces the bottom of the electrolytic cell.
6. The electrochemical evaluation device for the protective effect of the rust-proof oil film layer on the surface of the bearing according to claim 3, wherein the auxiliary electrode has a unilateral area of more than 4cm2The platinum sheet is led out of a reserved opening at the top end of the electrolytic cell through a lead and is connected with the input end of an auxiliary electrode of the electrochemical workstation.
7. The electrochemical evaluation device for the protective effect of the rust-proof oil film layer on the bearing surface as claimed in claim 3, wherein the salt bridge is composed of a ox horn-shaped glass tube with an aperture of 1.5mm at one end and an aperture of 15mm at the other end and a length of 12-15cm and an KCl-agar mixture in a coagulated state inside.
8. The electrochemical evaluation device for the protective effect of the rust-proof oil film layer on the bearing surface as claimed in claim 3, wherein the reference electrode is a saturated calomel electrode or an Ag/AgCl reference electrode.
9. The electrochemical evaluation device for the protective effect of the antirust oil film layer on the bearing surface according to claim 3, wherein the salt bridge and the auxiliary electrode are both positioned on the working surface side of the composite electrode of the bearing steel sample and the antirust oil film layer, and the salt bridge is positioned between the auxiliary electrode and the composite electrode of the bearing steel sample and the antirust oil film layer and is not in contact with each other.
10. The electrochemical evaluation method for the protection effect of the anti-rust oil film layer on the surface of the bearing is characterized by comprising the following steps:
(1) measuring the real-time open-circuit potential value of the bearing steel sample and the anti-rust oil film layer composite electrode in the corrosion simulation solution through an electrochemical workstation, recording and displaying the measured open-circuit potential value evolution result through a processor, and finishing the measurement when the drift amount of the open-circuit potential value is stabilized within +/-10 mV;
(2) after the open-circuit potential measurement is finished, the bearing steel sample and the anti-rust oil film layer composite electrode reach an electrochemical stable state in a corrosion simulation solution; the electrochemical workstation enters an electrochemical impedance spectrum measurement mode, the measurement frequency range is 100kHz-10mHz, and the disturbance signal is 10 mV; recording and displaying the measured electrochemical impedance spectrum evolution result through a processor;
(3) after the electrochemical impedance spectrum measurement is finished, performing equivalent circuit model fitting analysis on the measured electrochemical impedance spectrum through an impedance spectrum equivalent circuit model fitting module to obtain electrochemical parameters of a constant phase angle element reflecting the adsorption capacity of the antirust oil film layer and the surface of the bearing steel sample; meanwhile, obtaining a charge transfer resistance value reflecting the difficulty degree of the anodic dissolution reaction of the bearing steel sample substrate;
(4) according to the electrochemical parameter values and the charge transfer resistance values of the constant phase angle elements of the bearing steel sample in the corrosion simulation solution under the coverage of different anti-rust oil film layers obtained by the equivalent circuit model fitting, comparing the difference of the protection effects of the different anti-rust oil film layers on the bearing steel sample; and (3) according to the electrochemical parameter values and the charge transfer resistance values of the constant phase angle elements of the bearing steel sample in different corrosion simulation solutions under the condition that the same anti-rust oil film layer is obtained by fitting the equivalent circuit model, and comparing the influence of the corrosion environment change on the protection effect of the same anti-rust oil film layer.
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