CN110261296A - A kind of spot corrosion simulation test device and method - Google Patents
A kind of spot corrosion simulation test device and method Download PDFInfo
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- CN110261296A CN110261296A CN201910608192.7A CN201910608192A CN110261296A CN 110261296 A CN110261296 A CN 110261296A CN 201910608192 A CN201910608192 A CN 201910608192A CN 110261296 A CN110261296 A CN 110261296A
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Abstract
The present invention provides a kind of spot corrosion simulation test device and methods, it include: the first electrolytic cell, the second electrolytic cell, the first auxiliary electrode, the first reference electrode, the first working electrode, conducting wire, salt bridge, zero resistance galvanic corrosion meter, the second auxiliary electrode, the second reference electrode and the second working electrode, the first auxiliary electrode, simulates the first working electrode setting of borrosion hole interior metal in the first electrolytic cell and accesses preset first electrochemical workstation at the first reference electrode；Second working electrode of the second auxiliary electrode, the second reference electrode and simulation borrosion hole external metallization is arranged in the second electrolytic cell；Zero resistance galvanic corrosion meter is connected with the first working electrode and the second working electrode respectively by conducting wire；One end of salt bridge is located in the first electrolytic cell, and the other end is located in the second electrolytic cell；Borrosion hole internal simulation solution is filled in first electrolytic cell；Borrosion hole external analog solution is filled in second electrolytic cell.The evaluation precision of metal material performance can be promoted.
Description
Technical field
The present invention relates to metal spot corrosion to evaluate field, in particular to a kind of spot corrosion simulation test device and method.
Background technique
Spot corrosion is that the partial region of metal material surface the corrosion aperture (abbreviation borrosion hole) developed in depth and breadth, remaining region occurs
It is not slight there is a phenomenon where corroding or corroding, it is that the harmfulness that metal material faces is maximum and most common a kind of local rotten
Erosion form.Wherein, it is recognized that spot corrosion formation mechenism be occluded corrosion cell autocatalytic effect, due to metal inside the borrosion hole after forming core
Dissolution generate a large amount of metal ions, Hydrolysis Reactions of Metal-ions generates a large amount of H again+Ion causes the pH value inside borrosion hole constantly to drop
Low, borrosion hole inside and outside forms the pH value of differentiation, so that current loop is formed, a large amount of anion (predominantly Cl-Ion) in sun
It is moved into inside borrosion hole under the electric field action that ion accumulation is formed, so that the aggressivity for forming richness Cl- richness H+ inside borrosion hole is extremely strong
Environment, and low erosion environment condition is still outside borrosion hole, due to the difference of borrosion hole internal and external environment, cause constantly corrosion inside borrosion hole
Dissolution, and it is intact outside borrosion hole, to bring great security risk to metal material.
Currently, generally using spot corrosion accelerated test method, including electrokinetic potential to evaluate the pitting resistance of metal material
Polarize accelerated process, constant potential polarization accelerated process and FeCl3Solution impregnates accelerated process.But such accelerated method can only be by entire gold
Belong to and be used as research object, inside and outside distinguish of borrosion hole during spot corrosion cannot individually be studied, it is used
The practical Service Environment of test(ing) medium also substantial deviation metal, thus, based on such spot corrosion accelerated test to metal material spot corrosion
Performance is evaluated, and precision is not high, to lower using the reference value of the metal material；Further, such spot corrosion accelerates examination
Proved recipe method cannot simulate the interaction that borrosion hole is inside and outside in actual spot corrosion growth behavior, can not also obtain spot corrosion growth
Actual growth kinetics information in the process is unfavorable for understanding and studying spot corrosion growth mechanism in depth.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of completely new spot corrosion simulation test device and method, to be promoted
The evaluation precision of metal material pitting resistance.
In a first aspect, the embodiment of the invention provides spot corrosion simulation test devices, comprising: the first electrolytic cell, the second electrolysis
Pond, the first auxiliary electrode, the first reference electrode, the first working electrode, conducting wire, salt bridge, zero resistance galvanic corrosion meter, the second auxiliary
Electrode, the second reference electrode and the second working electrode, wherein
First auxiliary electrode, the first reference electrode, the first working electrode are arranged in the first electrolytic cell, the first auxiliary electricity
Pole, the first reference electrode and the first working electrode access pre-set first electrochemical workstation, and the first working electrode is used for
Simulate borrosion hole interior metal；
Second auxiliary electrode, the second reference electrode and the second working electrode are arranged in the second electrolytic cell, the second work
Electrode is for simulating borrosion hole external metallization；
Zero resistance galvanic corrosion meter is connected with the first working electrode and the second working electrode respectively by conducting wire, for surveying
One working electrode of flow control flows to the electric current of the second working electrode；
One end of salt bridge is located in the first electrolytic cell, and the other end is located in the second electrolytic cell；
Borrosion hole internal simulation solution is filled in first electrolytic cell；
Borrosion hole external analog solution is filled in second electrolytic cell.
With reference to first aspect, the embodiment of the invention provides the first possible embodiments of first aspect, wherein institute
It states the second auxiliary electrode, the second reference electrode and the second working electrode and accesses pre-set second electrochemical workstation.
With reference to first aspect or the first possible embodiment of first aspect, the embodiment of the invention provides first party
The possible embodiment of second of face, wherein further include:
Data processor, pitting corrosion electric current and the first electrochemistry for being measured to the measurement of zero resistance galvanic corrosion
The exceptional value in pitting corrosion electric current that work station measurement obtains is filtered.
The possible embodiment of second with reference to first aspect, the embodiment of the invention provides the third of first aspect
Possible embodiment, wherein further include:
Display, for being carried out to filtered pitting corrosion electric current and filtered extrinsic current according to time history
It is shown after Drawing of Curve.
Second aspect, the embodiment of the invention also provides a kind of spot corrosion simulation experiment methods, comprising:
The borrosion hole internal simulation solution of simulation borrosion hole internal environment is added into the first electrolytic cell, adds into the second electrolytic cell
Enter to simulate the borrosion hole external analog solution of metal material Service Environment；
The first working electrode and the second working electrode are connected using conducting wire, and accesses zero resistance galvanic corrosion meter；
One end of salt bridge is placed in the first electrolytic cell, the other end is placed in the second electrolytic cell；
The first electrification of the first working electrode, the first auxiliary electrode and the first reference electrode access of the first electrolytic cell will be put into
Learn work station；
Using zero resistance galvanic corrosion meter, the extrinsic current flowed to outside borrosion hole in borrosion hole is recorded；
Based on the extrinsic current and pitting corrosion electric current, metal material spot corrosion growth rate and pitting corrosion resistance can be carried out and comment
Valence.
In conjunction with second aspect, the embodiment of the invention provides the first possible embodiments of second aspect, wherein institute
State method further include:
Second working electrode, the second auxiliary electrode and the second reference electrode are accessed into the second electrochemical workstation, so that institute
State the electric current of the cathodic reduction reaction occurred outside the second electrochemical workstation measurement borrosion hole；
The borrosion hole external cathode reduction reaction electric current and zero resistance galvanic corrosion that second electrochemical workstation measurement is obtained
It counts the extrinsic current flowed to outside borrosion hole in the borrosion hole of measurement to be weighted and averaged, as the extrinsic current flowed in borrosion hole outside borrosion hole.
In conjunction with second aspect, the embodiment of the invention provides second of possible embodiments of second aspect, wherein institute
State method further include:
Change the borrosion hole internal simulation solution filled in the first electrolytic cell concentration, and/or, the first working electrode and second
The area ratio of working electrode, pitting corrosion electric current and the extrinsic current analysis of metallic materials spot corrosion speed of growth based on acquisition and resistance to
The influence factor of pitting corrosion.
In conjunction with the first or second of possible embodiment of second aspect, second aspect, the embodiment of the present invention is provided
The third possible embodiment of second aspect, wherein the method also includes:
According to time history, extrinsic current and pitting corrosion electric current to record carry out Drawing of Curve.
In conjunction with the first or second of possible embodiment of second aspect, second aspect, the embodiment of the present invention is provided
4th kind of possible embodiment of second aspect, wherein first and second described working electrode is 304 stainless steels, institute
It states in borrosion hole internal simulation solution, FeCl2For 2.96mol/L, NiCl2For 0.33mol/L, CrCl3For 0.72mol/L, the erosion
Hole external analog solution is the NaCl solution that mass fraction is 3.5%.
In conjunction with the first or second of possible embodiment of second aspect, second aspect, the embodiment of the present invention is provided
5th kind of possible embodiment of second aspect, wherein the area of first working electrode is 1cm2, the second work electricity
The area of pole is respectively 1,2,4,8,16,32,64 and 128cm2。
The third aspect, the embodiment of the present application provide a kind of computer equipment, including memory, processor and are stored in institute
The computer program that can be run on memory and on the processor is stated, the processor executes real when the computer program
The step of existing above method.
Fourth aspect, the embodiment of the present application provide a kind of computer readable storage medium, the computer-readable storage
Computer program is stored on medium, the computer program executes above-mentioned method when being run by processor the step of.
Spot corrosion simulation test device provided in an embodiment of the present invention and method, spot corrosion simulation test device include: the first electricity
Xie Chi, the second electrolytic cell, the first auxiliary electrode, the first reference electrode, the first working electrode, conducting wire, salt bridge, zero resistance galvanic couple are rotten
Lose meter, the second auxiliary electrode, the second reference electrode and the second working electrode, wherein the first auxiliary electrode, the first reference electricity
Pole, the first working electrode are arranged in the first electrolytic cell, the first auxiliary electrode, the first reference electrode and the access of the first working electrode
Pre-set first electrochemical workstation, the first working electrode is for simulating borrosion hole interior metal；Second auxiliary electrode, second
Reference electrode and the second working electrode are arranged in the second electrolytic cell, and the second working electrode is for simulating borrosion hole external metallization；
Zero resistance galvanic corrosion meter is connected with the first working electrode and the second working electrode respectively by conducting wire, for measuring the first work
The electric current of the second working electrode is flowed to as electrode；One end of salt bridge is located in the first electrolytic cell, and the other end is located at the second electrolytic cell
It is interior；Borrosion hole internal simulation solution is filled in first electrolytic cell；Borrosion hole external analog solution is filled in second electrolytic cell.This
Sample, due to borrosion hole internal simulation solution and the borrosion hole internal environment phase in the Pitting corrosion behavior of the practical Service Environment of metal material
Match, borrosion hole external analog solution matches with the practical Service Environment of metal material, obtained extrinsic current and pitting corrosion electric current energy
The spot corrosion growth rate and pitting resistance of enough accurate reflection metal materials, so as to effectively be promoted to metal material performance
Evaluation precision.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate
Appended attached drawing, is described in detail below.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is spot corrosion simulation test device structural schematic diagram provided by the embodiments of the present application；
Fig. 2 is spot corrosion simulation experiment method flow diagram provided by the embodiments of the present application；
Fig. 3 is the point of the first working electrode provided by the embodiments of the present application and the second working electrode under different area ratio
Lose speed of growth schematic diagram；
Fig. 4 is a kind of structural schematic diagram of computer equipment 400 provided by the embodiments of the present application.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
Middle attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
It is a part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is real
The component for applying example can be arranged and be designed with a variety of different configurations.Therefore, of the invention to what is provided in the accompanying drawings below
The detailed description of embodiment is not intended to limit the range of claimed invention, but is merely representative of selected reality of the invention
Apply example.Based on the embodiment of the present invention, those skilled in the art institute obtained without making creative work
There are other embodiments, shall fall within the protection scope of the present invention.
Experimental solutions environment in view of existing spot corrosion accelerated test method, for being evaluated metal material performance
And locating electrode potential, it is larger with actual metal Service Environment and locating potential difference, so that being grown to metal material spot corrosion
The precision that speed and pitting corrosion resistance can be carried out evaluation is not high, and this method cannot accurately simulate actual spot corrosion growth behavior,
Actual growth kinetics information in spot corrosion growth course can not be obtained, is unfavorable for understanding and studying spot corrosion growth mechanism in depth.
Based on this, the embodiment of the invention provides a kind of spot corrosion simulation test device and methods, by the way that double-electrolyzer is arranged, in an electrolysis
It is filled with the simulated solution of simulation borrosion hole internal environment in pond, is filled in another electrolytic cell outside the borrosion hole of simulation metal Service Environment
Portion's simulated solution, so that the speeding-up simulation solution used in double-electrolyzer corresponds with the practical Service Environment and erosion of metal material
Hole internal environment, thus using two electrolytic cells, realize the borrosion hole internal environment to match with actual borrosion hole internal and external environment and
The Pitting corrosion behavior in practical Service Environment is accurately simulated in the reproduction of borrosion hole external environment, obtained spot corrosion speeding-up simulation
Test result can accurately reflect the spot corrosion growth rate and pitting resistance of metal material, can effectively be promoted to metal material
The evaluation precision of performance；Further, it is tested based on the spot corrosion speeding-up simulation, it is electric to being carried out respectively outside borrosion hole inside and borrosion hole
Test chemical, the electrochemical source of current information in available spot corrosion growth course in borrosion hole and outside borrosion hole, so as to based on
Electrochemical source of current information inside and outside the borrosion hole arrived obtains the actual growth kinetics information of borrosion hole, convenient for understanding in depth and studying
Spot corrosion growth mechanism, is described below by embodiment.
Embodiment 1
Fig. 1 is spot corrosion simulation test device structural schematic diagram provided by the embodiments of the present application.As shown in Figure 1, the spot corrosion mould
Quasi- experimental rig, comprising: the first electrolytic cell 101, the second electrolytic cell 102, the first auxiliary electrode 103, the first reference electrode 104,
First working electrode 105, conducting wire 106, salt bridge 107, zero resistance galvanic corrosion meter 108, the second auxiliary electrode 109, the second reference
Electrode 110 and the second working electrode 111, wherein
First auxiliary electrode 103, the first reference electrode 104, the first working electrode 105 are arranged in the first electrolytic cell 101,
First auxiliary electrode 103, the first reference electrode 104 and the first working electrode 105 access pre-set first electrochemical operation
It stands, the first working electrode 105 is for simulating borrosion hole interior metal；
Second auxiliary electrode 109, the second reference electrode 110 and the second working electrode 111 are arranged in the second electrolytic cell 102
Interior, the second working electrode 111 is for simulating borrosion hole external metallization；
Zero resistance galvanic corrosion meter 108 by conducting wire 106 respectively with the first working electrode 105 and the second working electrode 111
It is connected, the electric current of the second working electrode 111 is flowed to for measuring the first working electrode 105；
One end of salt bridge 107 is located in the first electrolytic cell 101, and the other end is located in the second electrolytic cell 102；
Borrosion hole internal simulation solution is filled in first electrolytic cell 101；
Borrosion hole external analog solution is filled in second electrolytic cell 102.
In the embodiment of the present application, the salt bridge of the first electrolytic cell and the second electrolytic cell is connected to for simulating borrosion hole inside and borrosion hole
The first access of ion between outside, connect the conducting wire of the first working electrode and the second working electrode for simulate inside borrosion hole with
Electronics alternate path between borrosion hole outside, the first access of ion and electronics alternate path form current loop.
In the embodiment of the present application, as an alternative embodiment, the first working electrode 105 and the second working electrode 111 are selected
304 stainless steels.
In the embodiment of the present application, borrosion hole external analog solution is the solution medium for simulating metal material Service Environment.
In the embodiment of the present application, the first electrochemical workstation is for measuring spot corrosion corrosion current, i.e. metal material in borrosion hole
Lysigenous electric current, pitting corrosion electric current is bigger, and the solution rate for characterizing metal material in borrosion hole is faster, anti-inside borrosion hole
Answer speed faster, i.e. the spot corrosion speed of growth is faster；Zero resistance galvanic corrosion meter is for measuring the dispatch from foreign news agency flowed to outside borrosion hole in borrosion hole
Stream.Growth kinetics information includes: pitting corrosion current information and dispatch from foreign news agency stream information.
It,, can also be by order to promote the accuracy of dispatch from foreign news agency flow measurement as an alternative embodiment in the embodiment of the present application
Two auxiliary electrodes 109, the second reference electrode 110 and the second working electrode 111 access pre-set second electrochemical operation
It stands, for measuring the electric current for the cathodic reduction reaction that borrosion hole outside occurs, is flowed in the borrosion hole measured with zero resistance galvanic corrosion meter
Extrinsic current to outside borrosion hole is weighted and averaged, and obtains flowing to the extrinsic current outside borrosion hole in borrosion hole.
In the embodiment of the present application, obtained extrinsic current, time of measuring can be measured according to zero resistance galvanic corrosion meter 108
Pitting corrosion electric current that point and the first electrochemical workstation measurement obtain, time of measuring point are depicted as with the time as horizontal seat
Mark, pitting corrosion electric current and extrinsic current are the curve of ordinate and display, are accelerated to provide visual spot corrosion for tester
Analog reslt, tester can curve according to display and expected index values, it is determined whether terminate the spot corrosion and accelerate mould
Quasi- test.Thus, as an alternative embodiment, which can also include:
Display (not shown), for being obtained to the measurement of zero resistance galvanic corrosion meter 108 outer according to time history
The pitting corrosion electric current that electric current and the first electrochemical workstation measurement obtain is shown after carrying out Drawing of Curve.
In practical application, before carrying out Drawing of Curve, can to the exceptional value in pitting corrosion electric current and extrinsic current into
Row filtering, thus, as another alternative embodiment, which can also include:
Data processor (not shown), based on to zero resistance galvanic corrosion the 108 obtained extrinsic currents of measurement and
The exceptional value in pitting corrosion electric current that first electrochemical workstation measurement obtains is filtered.
In the embodiment of the present application, after being filtered to the exceptional value in pitting corrosion electric current and extrinsic current, it can incite somebody to action
Filtered data are exported to display.
In the embodiment of the present application, after setting spot corrosion simulation test device, borrosion hole internal simulation solution is poured into the first electricity
It solves in pond 101, borrosion hole external analog solution is poured into the second electrolytic cell 102, utilize the first working electrode 105 and second of connection
The zero resistance galvanic corrosion meter 108 of working electrode 111, which measures, to be flowed to the extrinsic current outside borrosion hole in borrosion hole and is recorded, and utilizes the
One electrochemical workstation measures spot corrosion corrosion current.Due to the point of borrosion hole internal simulation solution and the practical Service Environment of metal material
Environment matches in borrosion hole in erosion behavior, and borrosion hole external analog solution matches with the practical Service Environment of metal material, obtains
Extrinsic current and pitting corrosion electric current can accurately reflect metal material spot corrosion growth rate and pitting resistance, so as to have
Effect promotes the evaluation precision to metal material performance；Further, it is tested based on the spot corrosion speeding-up simulation, obtained extrinsic current can
To reflect the ion flow situation inside and outside borrosion hole, to characterize the electrochemical source of current information in spot corrosion growth course outside borrosion hole, point
Erosion corrosion current can characterize the electrochemical source of current information in spot corrosion growth course in borrosion hole, the dissolution feelings of reacting metal material
Shape, so as to obtain the actual growth kinetics information of borrosion hole, just based on the electrochemical source of current information inside and outside obtained borrosion hole
In understanding and study spot corrosion growth mechanism in depth.
Embodiment 2
Fig. 2 is spot corrosion simulation experiment method flow diagram provided by the embodiments of the present application.As shown in Fig. 2, the spot corrosion mould
Quasi- test method includes:
Step 201, the borrosion hole internal simulation solution of simulation borrosion hole internal environment is added into the first electrolytic cell, to the second electricity
The borrosion hole external analog solution of simulation metal material Service Environment is added in Xie Chizhong；
In the embodiment of the present application, as an alternative embodiment, borrosion hole internal simulation solution includes but is not limited to containing borrosion hole
The saturated solution of corrosion product.
Step 202, the first working electrode and the second working electrode are connected using conducting wire, and accesses zero resistance galvanic corrosion
Meter；
In the embodiment of the present application, as an alternative embodiment, the first working electrode is used to simulate borrosion hole internal metallic material,
Second working electrode is for simulating borrosion hole external metal material.
In the embodiment of the present application, for connecting the conducting wire of the first working electrode and the second working electrode for simulating in borrosion hole
Electronics access between portion and borrosion hole outside, zero resistance galvanic corrosion meter flow to the second work by the first working electrode for measuring
The extrinsic current of electrode.
Step 203, one end of salt bridge is placed in the first electrolytic cell, the other end is placed in the second electrolytic cell；
In the embodiment of the present application, it is placed in the salt bridge in the first electrolytic cell and in the second electrolytic cell and is formed inside simulation borrosion hole
Ion circuit between borrosion hole outside.
Step 204, the first working electrode, the first auxiliary electrode and the first reference electrode that are put into the first electrolytic cell are accessed
First electrochemical workstation, and record the spot corrosion electric current of the first working electrode；
In the embodiment of the present application, the first working electrode, the first auxiliary electrode and the first reference electrode form three-electrode system,
Three-electrode system is accessed into the first electrochemical workstation, measures spot corrosion corrosion current.
In the embodiment of the present application, the first electrochemical workstation records the solution rate (pitting corrosion of metal material in borrosion hole
Electric current), so that it is based on pitting corrosion electric current, the electrochemical source of current information inside available borrosion hole.
Step 205, using zero resistance galvanic corrosion meter, the extrinsic current flowed to outside borrosion hole in borrosion hole is recorded；
Step 206, it is based on the extrinsic current and pitting corrosion electric current, to metal material spot corrosion growth rate and pitting corrosion resistance
It can be carried out evaluation.
In the embodiment of the present application, as an alternative embodiment, metal material performance is evaluated including but not limited to: right
The service life of metal material is estimated, to quality classification of metal material etc..
In the embodiment of the present application, pitting corrosion electric current flows to outside borrosion hole inside borrosion hole to characterize the spot corrosion speed of growth
Speed of the electric current to characterize the cathodic reduction reaction occurred outside borrosion hole.In compared with the existing technology, pass through single acceleration
The borrosion hole and its corrosion rate information, the application that solution environmental or the single spot corrosion accelerated method for increasing polarization potential are formed are implemented
In example, by two electrolytic cells, it is respectively charged into borrosion hole internal simulation solution and borrosion hole external analog solution, can more meet metal material
The Pitting corrosion behavior occurred in practical Service Environment is expected, so that the oxidationreduction current precision that measurement obtains is higher, moreover, sharp
With double-electrolyzer, the pitting corrosion electric current of dissolving metal speed in available reflection borrosion hole, and, by flowing to borrosion hole in borrosion hole
Outer extrinsic current carries out more efficiently analysis to the mechanism of spot corrosion so as to be based on pitting corrosion electric current and extrinsic current.
In the embodiment of the present application, in order to promote the measurement accuracy of extrinsic current, as an alternative embodiment, this method is also wrapped
It includes:
Second working electrode, the second auxiliary electrode and the second reference electrode are accessed into the second electrochemical workstation, so that institute
State the electric current of the cathodic reduction reaction outside the second electrochemical workstation measurement borrosion hole；
The electric current and zero resistance galvanic couple for the borrosion hole external cathode reduction reaction that second electrochemical workstation measurement is obtained are rotten
The extrinsic current flowed to outside borrosion hole in the borrosion hole of erosion meter measurement is weighted and averaged, as the extrinsic current flowed to outside borrosion hole in borrosion hole.
In the embodiment of the present application, the second working electrode, the second auxiliary electrode and the second reference electrode form another three electrode
The three-electrode system is accessed the second electrochemical workstation by system, by what is occurred outside the second electrochemical workstation record borrosion hole
The electric current of cathodic reduction reaction, so that the electrochemical reaction information outside borrosion hole can be obtained based on average weighted extrinsic current.
In the embodiment of the present application, as another alternative embodiment, this method further include:
Change the borrosion hole internal simulation solution filled in the first electrolytic cell concentration, and/or, the first working electrode and second
The area ratio of working electrode, pitting corrosion electric current and extrinsic current analysis of metallic materials spot corrosion growth rate based on acquisition and resistance to
The influence factor of pitting corrosion.
It, can by electrochemistry speeding-up simulation test is carried out outside borrosion hole inside and borrosion hole respectively in the embodiment of the present application
To respectively obtain the electrochemical source of current information in borrosion hole and outside borrosion hole.
In the embodiment of the present application, as yet another alternative embodiment, this method further include:
According to time history, extrinsic current and pitting corrosion electric current to record carry out Drawing of Curve.
Embodiment 3
In the embodiment of the present application, according to the material of the first working electrode and the second working electrode (being 304 stainless steels) at
The ratio (72.6:17.59:8.03) of iron, nickel, chromium in point, the solution containing borrosion hole corrosion product of configuration is (in borrosion hole
Portion's simulated solution) in, corrosion product total concentration is 4mol/L, wherein FeCl2For 2.96mol/L, NiCl2For 0.33mol/L,
CrCl3For 0.72mol/L.The solution medium of simulation metal material Service Environment is the NaCl solution that concentration is 3.5%.
The borrosion hole internal simulation solution of configuration is added in the first electrolytic cell, and the first working electrode is immersed to first
In electrolytic cell, to simulate borrosion hole internal environment；The 3.5%NaCl solution of configuration is added in the second electrolytic cell, and by second
Working electrode is immersed into the second electrolytic cell, to simulate borrosion hole external environment.
It is 1cm using sectional area in the embodiment of the present application2Salt bridge, the first electrolytic cell and the second electrolytic cell are connected, benefit
The first working electrode and the second working electrode are connected with conducting wire, in the access that the first working electrode is connect with the second working electrode
On, access zero resistance galvanic corrosion meter.
In the embodiment of the present application, the area of the first working electrode is 1cm2, the area of the second working electrode is respectively 1,2,
4,8,16,32,64 and 128cm2。
First electrochemical workstation uses method of polarization curve, obtains the dissolving metal speed (spot corrosion on the first working electrode
Current density), obtain the spot corrosion speed of growth of the first working electrode and the second working electrode under different area ratio.
Fig. 3 is the point of the first working electrode provided by the embodiments of the present application and the second working electrode under different area ratio
Lose speed of growth schematic diagram.In Fig. 3, the first working electrode is anode, is denoted as WE1, and the second working electrode is cathode, is denoted as WE2,
In different area ratio, the spot corrosion current density (corrosion electric current density) on the first working electrode is spot corrosion growth for cathode and anode
Speed (mA/cm2)。
Table 1 is the current density (extrinsic current outside borrosion hole is flowed in borrosion hole) and first flowed through on zero resistance galvanic corrosion meter
The relationship of corrosion electric current density on working electrode.
Embodiment 4
In the embodiment of the present application, according in the material composition of 304 stainless steels iron, nickel, chromium ratio (72.6:
17.59:8.03), in the borrosion hole internal simulation solution of configuration, FeCl2、NiCl2With CrCl3The ratio between molal quantity be 72.6:
17.59:8.03, the concentration that corrosion product in borrosion hole internal simulation solution is arranged is respectively 1,2,4,6mol/L and saturation state.
The borrosion hole internal simulation solution of various concentration is added separately in the first electrolytic cell, the first working electrode is immersed
In first electrolytic cell, for simulating borrosion hole internal environment；3.5%NaCl solution is added in second electrolytic cell, by the second work electricity
Pole is immersed in the second electrolytic cell, for simulating borrosion hole external environment.
The area ratio of first working electrode and the second working electrode is fixed as 1:64, is 1cm using sectional area2Salt
Bridge connects the first electrolytic cell and the second connection pool, the first working electrode and the second working electrode is connected using conducting wire, first
On the access that working electrode is connect with the second working electrode, zero resistance galvanic corrosion meter is accessed.
It is measured using electrochemical workstation using polarization curve technology for the borrosion hole internal simulation solution of every kind of concentration
Pitting corrosion current density on first working electrode, the data are the asynchronous spot corrosion life of corrosion product concentration inside borrosion hole
Long speed, and record the dispatch from foreign news agency current density that zero resistance galvanic corrosion meter flows through.
Table 2 is the area ratio of the second working electrode and the first working electrode when being 64, under different borrosion hole corrosion product concentration,
The ratio of pitting corrosion electric current and extrinsic current.
As shown in figure 4, one embodiment of the application provides a kind of computer equipment 400, for executing the spot corrosion mould in Fig. 2
Quasi- test method, the equipment include memory 401, processor 402 and are stored on the memory 401 and can be in the processor
The computer program run on 402, wherein above-mentioned processor 402 realizes above-mentioned spot corrosion simulation when executing above-mentioned computer program
The step of test method.
Specifically, above-mentioned memory 401 and processor 402 can be general memory and processor, do not do have here
Body limits, and when the computer program of 402 run memory 401 of processor storage, is able to carry out above-mentioned spot corrosion simulation test side
Method.
Corresponding to the spot corrosion simulation experiment method in Fig. 2, the embodiment of the present application also provides a kind of computer-readable storages
Medium is stored with computer program on the computer readable storage medium, executes when which is run by processor
The step of stating spot corrosion simulation experiment method.
Specifically, which can be general storage medium, such as mobile disk, hard disk, on the storage medium
Computer program when being run, be able to carry out above-mentioned spot corrosion simulation experiment method.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, or be somebody's turn to do
Invention product using when the orientation or positional relationship usually put, be merely for convenience of description of the present invention and simplification of the description, without
It is that the device of indication or suggestion meaning or element must have a particular orientation, be constructed and operated in a specific orientation, therefore not
It can be interpreted as limitation of the present invention.In addition, term " first ", " second ", " third " etc. are only used for distinguishing description, and cannot manage
Solution is indication or suggestion relative importance.
In the description of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, term " setting ",
" installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected, may be a detachable connection or one
Connect to body；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be indirect by intermediary
It is connected, can be the connection inside two elements.For the ordinary skill in the art, on being understood with concrete condition
State the concrete meaning of term in the present invention.
Finally, it should be noted that embodiment described above, only a specific embodiment of the invention, to illustrate the present invention
Technical solution, rather than its limitations, scope of protection of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, those skilled in the art should understand that: anyone skilled in the art
In the technical scope disclosed by the present invention, it can still modify to technical solution documented by previous embodiment or can be light
It is readily conceivable that variation or equivalent replacement of some of the technical features；And these modifications, variation or replacement, do not make
The essence of corresponding technical solution is detached from the spirit and scope of technical solution of the embodiment of the present invention.Should all it cover in protection of the invention
Within the scope of.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. a kind of spot corrosion simulation test device characterized by comprising the first electrolytic cell, the second electrolytic cell, the first auxiliary electricity
Pole, the first reference electrode, the first working electrode, conducting wire, salt bridge, zero resistance galvanic corrosion meter, the second auxiliary electrode, the second reference
Electrode and the second working electrode, wherein
First auxiliary electrode, the first reference electrode, the first working electrode are arranged in the first electrolytic cell, the first auxiliary electrode, the
One reference electrode and the first working electrode access pre-set first electrochemical workstation, and the first working electrode is for simulating erosion
Hole interior metal；
Second auxiliary electrode, the second reference electrode and the second working electrode are arranged in the second electrolytic cell, the second working electrode
For simulating borrosion hole external metallization；
Zero resistance galvanic corrosion meter is connected with the first working electrode and the second working electrode respectively by conducting wire, for measuring the
One working electrode flows to the electric current of the second working electrode；
One end of salt bridge is located in the first electrolytic cell, and the other end is located in the second electrolytic cell；
Borrosion hole internal simulation solution is filled in first electrolytic cell；
Borrosion hole external analog solution is filled in second electrolytic cell.
2. spot corrosion simulation test device according to claim 1, which is characterized in that second auxiliary electrode, the second ginseng
Pre-set second electrochemical workstation is accessed than electrode and the second working electrode.
3. spot corrosion simulation test device according to claim 1 or 2, which is characterized in that further include:
Data processor, for measuring the pitting corrosion electric current and the first electrochemical operation that measure to zero resistance galvanic corrosion
The exceptional value stood in the obtained pitting corrosion electric current of measurement is filtered.
4. spot corrosion simulation test device according to claim 3, which is characterized in that further include:
Display, for carrying out curve to filtered pitting corrosion electric current and filtered extrinsic current according to time history
It is shown after drafting.
5. a kind of spot corrosion simulation experiment method characterized by comprising
The borrosion hole internal simulation solution of simulation borrosion hole internal environment is added into the first electrolytic cell, mould is added into the second electrolytic cell
The borrosion hole external analog solution of quasi- metal material Service Environment；
The first working electrode and the second working electrode are connected using conducting wire, and accesses zero resistance galvanic corrosion meter；
One end of salt bridge is placed in the first electrolytic cell, the other end is placed in the second electrolytic cell；
The first working electrode, the first auxiliary electrode and the first reference electrode that are put into the first electrolytic cell are accessed into the first electrochemistry work
It stands；
Using zero resistance galvanic corrosion meter, the extrinsic current flowed to outside borrosion hole in borrosion hole is recorded；
Based on the extrinsic current and pitting corrosion electric current, evaluation can be carried out to metal material spot corrosion growth rate and pitting corrosion resistance.
6. spot corrosion simulation experiment method according to claim 5, which is characterized in that the method also includes:
Second working electrode, the second auxiliary electrode and the second reference electrode are accessed into the second electrochemical workstation, so that described the
Two electrochemical workstations measure the electric current of the cathodic reduction reaction occurred outside borrosion hole；
The borrosion hole external cathode reduction reaction electric current and zero resistance galvanic corrosion that second electrochemical workstation measurement is obtained measure
The extrinsic current flowed to outside borrosion hole in fixed borrosion hole is weighted and averaged, as the extrinsic current flowed to outside borrosion hole in borrosion hole.
7. spot corrosion simulation experiment method according to claim 5, which is characterized in that the method also includes:
Change the borrosion hole internal simulation liquid filled in the first electrolytic cell concentration, and/or, the first working electrode and the second work are electric
The area ratio of pole, the spot corrosion growth rate and resistance to spot corrosion of pitting corrosion electric current and extrinsic current analysis of metallic materials based on acquisition
The influence factor of performance.
8. according to the described in any item spot corrosion simulation experiment methods of claim 5 to 7, which is characterized in that the method also includes:
According to time history, extrinsic current and pitting corrosion electric current to record carry out Drawing of Curve.
9. according to the described in any item spot corrosion simulation experiment methods of claim 5 to 7, which is characterized in that the first work electricity
Pole and the second working electrode are 304 stainless steels, in the borrosion hole internal simulation solution, FeCl2For 2.96mol/L, NiCl2For
0.33mol/L, CrCl3For 0.72mol/L, the borrosion hole external analog solution is the NaCl solution that mass fraction is 3.5%.
10. according to the described in any item spot corrosion simulation experiment methods of claim 5 to 7, which is characterized in that the first work electricity
The area of pole is 1cm2, the area of the second working electrode is respectively 1,2,4,8,16,32,64 and 128cm2。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112924376A (en) * | 2021-02-07 | 2021-06-08 | 中国石油天然气集团有限公司 | Device and method for testing waterline corrosion resistance of stainless steel pipe |
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