CN108680492A - The assay method of corrosion depth in the galvanic corrosion of metal welding joints position - Google Patents
The assay method of corrosion depth in the galvanic corrosion of metal welding joints position Download PDFInfo
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Abstract
The present invention discloses the assay method of corrosion depth in the galvanic corrosion of metal welding joints position, it is measured using the measurement device of metal welding joints position galvanic corrosion, computer carries out analyzing processing to the current signal of acquisition, export galvanic corrosion electric current, the anode and cathode region on weld joint samples surface can be determined according to galvanic corrosion current time figure and judges that the galvanic corrosion sensibility at each position of welding point is strong and weak, the size of corrosion electric current density is calculated first, after calculating galvanic corrosion current density, know the difference in cathodic region and anode region corrosion rate, by this be worth size with it is positive and negative to judge anode and cathode, and the difference of the two corrosion rate, corrosion depth is finally calculated.
Description
The present patent application is parent application " measurement device and assay method of metal welding joints position galvanic corrosion "
The applying date of divisional application, parent application is on April 29th, 2016, and application No. is 2016102867138.
Technical field
The invention belongs to the measurement device fields of galvanic corrosion, the especially measurement of metal welding joints position galvanic corrosion
Device and assay method.
Background technology
Galvanic corrosion, also referred to as bimetallic corrosion.When the difference of two or more different metal or same metal
After organizing (such as weld seam) to be contacted in conducting medium, corrosion galvanic cell is constituted since respective electrode potential is different.In electrolyte
Under moisture film, corrosion macro cell is formed, wherein negative potential corrosion of metal can be accelerated.Influence galvanic corrosion because be known as environment, be situated between
The area ratio etc. of matter electric conductivity, anode and cathode.Galvanic corrosion is generally dependent on the potential difference between dissimilar metal.Here current potential refers to
Be two kinds of metals or same metal different tissues (such as weld seam) the practical electricity in electrolyte solution (corrosive medium) respectively
Position, the i.e. corrosion potential of the metal in the solution.Wherein, generally, what current potential was high is used as cathode, the low conduct sun of current potential
Pole can especially form the galvanic couple pair of the big cathode of primary anode when annode area is smaller, corrosion is made to aggravate.It is constant in other conditions
In the case of, potential difference is bigger, and corrosion rate may be bigger.Said herein may be to pass through since current potential is thermodynamic data
Thermodynamic data exact can not state out the speed of corrosion process, or even sometimes because the difference of external environment there is also phase
Anti- conclusion.Therefore, to the data of dynamic process, i.e. the measurement of galvanic corrosion electric current just becomes particularly important.Pass through measurement
Obtained corrosion current can calculate corrosion rate difference between different materials or different tissues.To judge equipment specific
Corrosion behavior in environment.
Welding is the important process link in engineering manufacture, and many parts are all by being welded together.Due to
The tissue of inevitable Welded Joints has an impact in welding process, so even if two connecting components and wlding are all of the same race
Material, welding point is as galvanic corrosion occurs in corrosive environment for nonuniform organization.Study metal welding joints position
The method of corrosion mainly has：Salt spray test, immersion test method (full leaching, leaching etc.) and electrochemistry experiment method (potential measurement, galvanic couple
Current measurement, polarization measurement, electrochemical impedance measurement etc.).The former can only obtain Weight loss data and surface corrosion pattern, can not obtain
To corrosion current data, time-consuming.Although electrochemical method can obtain Electrochemistry Information, it is confined to study respectively mostly single
Also there is processing complicated and time consumption in region to working electrode prepared by laboratory, and it is even more impossible to realize online non-destructive testing.
Invention content
It is an object of the invention to overcome the deficiencies of the prior art and provide the surveys of metal welding joints position galvanic corrosion
Determine device and assay method, on-line checking goes out the corrosion Galvanic Current between each region in metal welding joints surface, to judge
Anode region and cathodic region obtain the galvanic corrosion degree in each region in metal welding joints surface, to judge its galvanic corrosion
Sensibility.
In order to solve the above-mentioned technical problem, the present invention is achieved by the following technical solutions：
The measurement device of metal welding joints position galvanic corrosion, including test probe, ion channel, electrochemical measurement dress
It sets and computer, wherein：
Electro-chemical measuring apparatus is connected with computer, and the electrochemical signals of acquisition are passed to calculating by electro-chemical measuring apparatus
Machine, computer export the numerical value of the galvanic corrosion electric current in the testing time to carry out analyzing processing to the current signal of acquisition；
The working end of electro-chemical measuring apparatus and ground terminal are separately connected two pieces of welded specimens to be measured, to acquire signal；
Test probe includes the first test probe and the second test probe, and the two structure is identical and is separately fixed at two pieces of welding examinations to be measured
On sample, it is made of probe upper cover, probe body, probe down tube and magnetic fixing bolt, probe upper cover lower end is connected with probe body
And sealing ring, the lower face center setting probe down tube of probe body, the lower face of probe body are set in the junction of the two
Quadrangle be symmetrical arranged magnetic fixing bolt, magnetite is set in the end of magnetic fixing bolt, for being adsorbed on welding test zone；
Sample contacts annulus is arranged in the lower face for down tube of popping one's head in；Upper and axial setting along probe upper cover is covered on probe on probe
Cavity is arranged in the inside of probe body and probe lower end, in probe upper cover, probe body and spy in the ion channel connecting hole of lid
After head lower end links into an integrated entity, ion channel connecting hole and the coaxially connected integral solution storage chamber of cavity；
One end of ion channel is arranged in the ion channel connecting hole of the probe upper cover of the first test probe, the other end
It is arranged in the ion channel connecting hole of the probe upper cover of the second test probe, to be connected to the solution storage of two test probes
Chamber.
In the above-mentioned technical solutions, the solution under metal welding joints actual working environment is set in solution storage chamber,
To simulate the working environment at position to be tested.
In the above-mentioned technical solutions, ion channel can be connected ion and can not conduct electrons, select plastic conduit and
Wherein filling can be connected ion and can not conduct electrons material, such as sponge, solution, gel are preferably filled with saturation chlorination
The silicone tube of potassium gel is as ion channel.
In the above-mentioned technical solutions, test probe selects insulating materials to prepare on the whole, such as polytetrafluoroethylene (PTFE).
In the above-mentioned technical solutions, base material area, heat affected area or weldering in sample to be tested is arranged in the first test probe
It closes area (i.e. weld metal zone)；The base material area in sample to be tested, heat affected area or soldering area (i.e. weld seam is arranged in second test probe
Area), so, weld metal zone, heat affected area can be measured respectively by coordinating between two probes；Heat affected area, base material；Weld metal zone,
Between base material, the galvanic corrosion electric current between different heat affected areas.
It is carrying out in use, carrying out as steps described below：
Step 1, test probe is fixed on the surface of sample to be tested using magnetite and magnetic fixing bolt and fitted closely,
Junction carries out liquid-leakage preventing processing using insulating materials (such as epoxide-resin glue, white silica gel, 502), at this time sample contacts annulus
It is fitted closely with the surface of sample to be tested
In step 1, if sample to be tested surface irregularity, coarse, or belong to non-magnetic material, using white silica gel or
Epoxy resin directly gives fixation to test probe.
Step 2, preconfigured solution is added into solution storage chamber, to simulate the different working condition of sample to be tested,
Part of the sample to be tested in sample contacts annulus is the test area of sample, and preconfigured mould is impregnated on this region
Quasi- solution；Ion channel is recycled to be connected to the solution in the solution storage chamber of two test probes.
Step 3, sample to be tested is connected with the working end of electro-chemical measuring apparatus and ground terminal respectively, opens electrochemistry and surveys
Amount device is tested, while being recorded to signal with computer.
In the above-mentioned technical solutions, base material area, heat affected area or weldering in sample to be tested is arranged in the first test probe
It closes area (i.e. weld metal zone), and the sample to be tested that the first test probe is arranged is connected with the working end of electro-chemical measuring apparatus；The
The base material area in sample to be tested, heat affected area or soldering area (i.e. weld metal zone) is arranged in two test probes, and is arranged second and surveys
The sample to be tested of probe header is connected with the ground terminal of electro-chemical measuring apparatus；So, coordinate and can divide between two probes
It Ce Ding not weld metal zone, heat affected area；Heat affected area, base material；Between weld metal zone, base material, the electricity between different heat affected areas
Thermogalvanic corrision electric current.The galvanic corrosion electric current measured by the method is the first test probe institute overlay area tissue under conducting state
The difference of corrosion current relative to the second test probe institute overlay area tissue, i.e. I=I1-I2。
In the above-mentioned technical solutions, before the start of the measurement, the sample to be tested and electrochemistry of the first test probe are set
The working end of measuring device is connected and forms conducting state, and the sample to be tested and electrochemical measurement that the second test probe is arranged fill
The ground terminal set is off, when starting test to obtain the transient state pulse current of connection moment.
In the above-mentioned technical solutions, by the signal of computer record electro-chemical measuring apparatus acquisition, in the second test of setting
Moment is connected with the ground terminal of electro-chemical measuring apparatus in the sample to be tested of probe, the moment transient state caused by potential difference
Pulse current continues to read galvanic corrosion current signal later, after waiting for that galvanic corrosion electric current is stablized, continues acquisition a period of time
Stop acquisition (such as 200-1000s) afterwards.And the data obtained is copied in TXT documents or in the record file of extended formatting.
Computer carries out analyzing processing to the current signal of acquisition, exports galvanic corrosion electric current, can according to galvanic corrosion current time figure
It is strong and weak with the galvanic corrosion sensibility for determining the anode and cathode region on weld joint samples surface and judge each position of welding point.
Compared with prior art, the beneficial effects of the invention are as follows：The device can detect that metal welding joints surface is each
Corrosion Galvanic Current between region obtains the electricity in each region in metal welding joints surface to judge anode region and cathodic region
Thermogalvanic corrision degree, to judge its galvanic corrosion sensibility.
Description of the drawings
Fig. 1 is the test probe structural schematic diagram of the present invention；
Fig. 2 is galvanic corrosion Current experiments wiring schematic diagram of the heat affected area to base material area of the present invention；
Fig. 3 is the elementary diagram signal of the present invention；
Fig. 4 is galvanic corrosion map of current of the heat affected area that is tested for the property of technical solution of the present invention to base material area；
Fig. 5 is galvanic corrosion map of current of the heat affected area that is tested for the property of technical solution of the present invention to soldering area；
Fig. 6 is galvanic corrosion map of current of the base material area that is tested for the property of technical solution of the present invention to soldering area.
Wherein 1 is ion channel connecting hole, and 2 be probe upper cover, and 3 be sealing ring, and 4 be probe body, and 5 be solution storage
Chamber, 6 be probe down tube, and 7 be magnetic fixing bolt, and 8 be sample contacts annulus, and 9 be magnetite, and 10 be working end, and 11 be ground terminal, 12
It is heat affected area for soldering area, 13,14 be base material area, and 15 be the first test probe, and 16 be the second test probe, and 17 survey for first
The work annulus of probe header, 18 be the work annulus of the second test probe, and 19 be ion channel, and 20 be electro-chemical measuring apparatus,
21 be computer.
Specific implementation mode
Present invention is further described in detail with specific embodiment below in conjunction with the accompanying drawings：
As shown in attached drawing 1-3, the measurement device of metal welding joints position galvanic corrosion of the invention, including test are visited
Head, ion channel, electro-chemical measuring apparatus and computer, wherein：
Electro-chemical measuring apparatus is connected with computer, and the electrochemical signals of acquisition are passed to calculating by electro-chemical measuring apparatus
Machine, computer export the numerical value of the galvanic corrosion electric current in the testing time to carry out analyzing processing to the current signal of acquisition；
The working end of electro-chemical measuring apparatus and ground terminal are separately connected two pieces of welded specimens to be measured, to acquire signal；
Test probe includes the first test probe and the second test probe, and the two structure is identical and is separately fixed at two pieces of welding examinations to be measured
On sample, it is made of probe upper cover, probe body, probe down tube and magnetic fixing bolt, probe upper cover lower end is connected with probe body
And sealing ring, the lower face center setting probe down tube of probe body, the lower face of probe body are set in the junction of the two
Quadrangle be symmetrical arranged magnetic fixing bolt, magnetite is set in the end of magnetic fixing bolt, for being adsorbed on welding test zone；
Sample contacts annulus is arranged in the lower face for down tube of popping one's head in；Upper and axial setting along probe upper cover is covered on probe on probe
Cavity is arranged in the inside of probe body and probe lower end, in probe upper cover, probe body and spy in the ion channel connecting hole of lid
After head lower end links into an integrated entity, ion channel connecting hole and the coaxially connected integral solution storage chamber of cavity；
One end of ion channel is arranged in the ion channel connecting hole of the probe upper cover of the first test probe, the other end
It is arranged in the ion channel connecting hole of the probe upper cover of the second test probe, to be connected to the solution storage chamber of two test probes
(and solution).
In the above-mentioned technical solutions, the solution under metal welding joints actual working environment is set in solution storage chamber,
To simulate the working environment at position to be tested.
In the above-mentioned technical solutions, ion channel can be connected ion and can not conduct electrons, select plastic conduit and
Wherein filling can be connected ion and can not conduct electrons material, such as sponge, solution, gel are preferably filled with saturation chlorination
The silicone tube of potassium gel is as ion channel.
In the above-mentioned technical solutions, test probe selects insulating materials to prepare on the whole, such as polytetrafluoroethylene (PTFE).
In the above-mentioned technical solutions, base material area, heat affected area or weldering in sample to be tested is arranged in the first test probe
It closes area (i.e. weld metal zone)；The base material area in sample to be tested, heat affected area or soldering area (i.e. weld seam is arranged in second test probe
Area), so, weld metal zone, heat affected area can be measured respectively by coordinating between two probes；Heat affected area, base material；Weld metal zone,
Between base material, the galvanic corrosion electric current between different heat affected areas.
It is carrying out in use, carrying out as steps described below：
Step 1, test probe is fixed on the surface of sample to be tested using magnetite and magnetic fixing bolt and fitted closely,
Junction carries out liquid-leakage preventing processing using insulating materials (such as epoxide-resin glue, white silica gel, 502), at this time sample contacts annulus
It is fitted closely with the surface of sample to be tested
In step 1, if sample to be tested surface irregularity, coarse, or belong to non-magnetic material, using white silica gel or
Epoxy resin directly gives fixation to test probe.
Step 2, preconfigured solution is added into solution storage chamber, to simulate the different working condition of sample to be tested,
Part of the sample to be tested in sample contacts annulus is the test area of sample, and preconfigured mould is impregnated on this region
Quasi- solution；Ion channel is recycled to be connected to the solution in the solution storage chamber of two test probes.
Step 3, sample to be tested is connected with the working end of electro-chemical measuring apparatus and ground terminal respectively, opens electrochemistry and surveys
Amount device is tested, while being recorded to signal with computer.
In the above-mentioned technical solutions, base material area, heat affected area or weldering in sample to be tested is arranged in the first test probe
It closes area (i.e. weld metal zone), and the sample to be tested that the first test probe is arranged is connected with the working end of electro-chemical measuring apparatus；The
The base material area in sample to be tested, heat affected area or soldering area (i.e. weld metal zone) is arranged in two test probes, and is arranged second and surveys
The sample to be tested of probe header is connected with the ground terminal of electro-chemical measuring apparatus；So, coordinate and can divide between two probes
It Ce Ding not weld metal zone, heat affected area；Heat affected area, base material；Between weld metal zone, base material, the electricity between different heat affected areas
Thermogalvanic corrision electric current.The galvanic corrosion electric current measured by the method is the first test probe institute overlay area tissue under conducting state
The difference of corrosion current relative to the second test probe institute overlay area tissue, i.e. I=I1-I2。
In the above-mentioned technical solutions, before the start of the measurement, the sample to be tested and electrochemistry of the first test probe are set
The working end of measuring device is connected and forms conducting state, and the sample to be tested and electrochemical measurement that the second test probe is arranged fill
The ground terminal set is off, when starting test to obtain the transient state pulse current of connection moment.
In the above-mentioned technical solutions, by the signal of computer record electro-chemical measuring apparatus acquisition, in the second test of setting
Moment is connected with the ground terminal of electro-chemical measuring apparatus in the sample to be tested of probe, the moment transient state caused by potential difference
Pulse current continues to read galvanic corrosion current signal later, after waiting for that galvanic corrosion electric current is stablized, continues acquisition a period of time
Stop acquisition (such as 200-1000s) afterwards.And the data obtained is copied in TXT documents or in the record file of extended formatting.
Computer carries out analyzing processing to the current signal of acquisition, exports galvanic corrosion electric current, can according to galvanic corrosion current time figure
It is strong and weak with the galvanic corrosion sensibility for determining the anode and cathode region on weld joint samples surface and judge each position of welding point.
The processing of galvanic corrosion current data.Before analyzing corrosion current, corrosion electric current density should be calculated first
Size.Corrosion electric current density is product of the corrosion current to corroded area, wherein the area is to work with electro-chemical measuring apparatus
The sample to be tested area being in contact with (simulation) solution in the sample contacts annulus of test probe on the connected sample to be tested in end is (i.e.
The area of sample contacts annulus), rather than (be connected with electro-chemical measuring apparatus ground terminal to be tested to the work area of electrode tip
The sample to be tested area being in contact with simulated solution in the sample contacts annulus of test probe on sample).Its corrosion electric current density is used
Following formula calculates：
ID=I/s
S=π R2
Wherein, IDFor galvanic corrosion current density, I is galvanic corrosion electric current, and s is work area, and R works for test probe
Annular radii (radius of sample contacts annulus).
When being tested using Multi probe, work area is the survey that is connect with the working end of electrochemical operation device
The total working area (the sum of i.e. each sample contacts annulus area) of probe header.
The determination of galvanic corrosion behavior and corrosion lack of uniformity.After calculating galvanic corrosion current density, we are only
It is the difference for being aware of cathodic region and anode region corrosion rate, i.e. ID=IPositive D-ICloudy D.Although by this be worth size with it is positive and negative
It may determine that whichever is anode, whichever is the difference of cathode and the two corrosion rate.But it can not know the corrosion speed of the two
The absolute value of degree.However, generally when galvanic corrosion occurs for the different material of two kinds of corrosion potentials, current potential is high cloudy
Pole is polarized, and corrosion rate declines, and current potential is low by anode polarization, and corrosion rate rises.When the two corrosion potential difference compared with
When big, it is believed that IPositive DMuch larger than ICloudy D, i.e. ID≈IPositive D.And when the corrosion potential difference of the two is smaller, it should be in conjunction with polarization
The tests such as curve are further calculated.
The determination of metal welding joints corrosion rate.When the corrosion potential of the two differs greatly, pass through corrosion current
Density can calculate the velocity magnitude of metal local corrosion.
It is Q=tI that its unit interval, which reacts electricity,D
It is m=QM/Fn that unit interval, which reacts gross mass,
Wherein t is the time, and n is the difference of the chemical valence of reactant and product, and F=96500 is Faraday constant, and M is anti-
Answer atomic molar quality.
Therefore corrosion rate A=m/ts
Wherein A units are g/m2H, s are electrode reaction area (work area used when calculating corrosion electric current density).
It may also indicate that corrosion depth is referred to as B=(24*365A)/1000d
Wherein B units are mm/, and d is the density of material, unit g/cm3
To above-mentioned formula, I is brought into respectivelyD、IPositive DAnd ICloudy DThe size of the local corrosion speed of different zones can be calculated.
First weld joint samples and the contact portion of solution in the work annulus of the first test probe are working electrode, the
Two weld joint samples and the contact portion of solution in the work annulus of the second test probe are to electrode；It works in probe down tube
The diameter of annulus chooses the width that should be subject to no more than measured tissue, chooses a diameter of 5mm；Work annulus and test button
Between should ensure to be in close contact and carry out liquid-leakage preventing work by adjusting magnetic fixing bolt；Probe body solution storage intracavitary should add
Enter the solution needed for welding point experiment；Pipeline thickness is connected in ion should be consistent with connecting hole to prevent solution from leaking out；Ion is led
Selection flexible material (silicone tube) of threading a pipe well is contacted with the holding of probe body internal solution.
The step of electric current of the galvanic corrosion between welding point different tissues is tested using the test probe of the present invention is such as
Under：
(1) test probe down tube and magnetic fixing bolt are connected in probe body, and by the first test probe and second
Test probe makes work annulus be adsorbed on different from the second welding point groups of the first welding point using magnetic fixing bolt respectively
Knit, the present embodiment determine respectively heat affected area relative to base material area, heat affected area relative to soldering area, base material area relative to
The size of the galvanic corrosion electric current in soldering area.Therefore under every group of experiment the first test probe and the second test probe work annulus
It should be adsorbed at corresponding tissue.Backward probe body solution storage intracavitary be added 3.5wt% sodium-chloride water solution (seawater
Simulated solution).Sample in the present embodiment is T4003 stainless steels, and surface has been subjected to grinding process, do not occur during the experiment
The leakage of solution, therefore it is not required to further liquid-leakage preventing measure.Sealing ring is placed into after injection solution and is tightened in probe upper cover
The internal silicone tube containing saturation chlorination potassium gel is inserted into flexible ion later and pipeline connecting hole is connected by probe body top
It is interior, and guarantee and solution close contact, make to form ion conductive channel between two probes.
(2) test probe does the connection at station with electrochemistry work：The line graph of this experiment is as shown in Fig. 2, Fig. 2 is heat affected area
To the wiring diagram of the galvanic corrosion testing current in base material area, the galvanic corrosion testing current between its hetero-organization, work annulus
The tissue covered is answered different.It is worth noting that：In order to obtain between different tissues turn-on transients corrosion current, answer
Electrochemical workstation working end is contacted with the first weld joint samples before ensureing test, and makes electrochemical workstation ground terminal and the
Two weld joint samples disconnect.It is connected with the second weld joint samples after test starts, then by electrochemical workstation ground terminal
It connects.
(3) setting of test parameters：This experiment uses the ZF-100 electrochemistry of Shanghai Electric Applicance Co., Ltd of pros production
Work station carries out transient state Galvanic Current test, scan frequency 20Hz, and sweep time is 15 minutes.This experiment is stainless to T4003
Galvanic corrosion map of current between steel welded joint sample different tissues is as shown in Figure 4-Figure 6.It is rotten by stable state galvanic couple in Fig. 4-6
The size of erosion electric current can obtain the difference of material different tissues average corrosion rate in the present context.
By measure and calculation, the result of calculation such as following table institute of the average value of the stable state galvanic corrosion electric current between different zones
Show：
In the galvanic corrosion testing current, if obtained electric current is positive value, the corrosion rate for representing working electrode is big
In to electrode, the corrosion rate in the region that as the first test probe work annulus is covered is faster.And bigger galvanic corrosion
The difference that the value of electric current represents corrosion rate is bigger.The relationship of corrosion rate is between we can obtain three kinds of tissues as a result,：
Heat affected area ＞ base materials area ＞ soldering area.
The transient state galvanic corrosion that the moment of test initial stage, connection electrochemical workstation ground terminal and the second welding point obtains
Sense of current may determine that the electric potential relation and difference of the two with size.In this experiment, the transient state electricity tested three times
Thermogalvanic corrision electric current is positive value, then the relationship of corrosion potential is between may determine that three kinds of tissues：Heat affected area ＜ base materials area ＜ is welded
Close area.By relation above it is found that corrosion proof relationship is between T4003 stainless steel welded joint different tissues：Heat affected area
＜ base materials area ＜ soldering area.
It describes the invention in detail, but content is only the preferred embodiment of the present invention, cannot be recognized above
For the practical range for limiting the present invention.Any changes and modifications in accordance with the scope of the present application should all still return
Belong within the patent covering scope of the present invention.
Claims (10)
1. the assay method of corrosion depth in the galvanic corrosion of metal welding joints position, which is characterized in that metal welding is made to connect
The measurement device of head position galvanic corrosion is measured, and the measurement device of metal welding joints position galvanic corrosion includes surveying
Probe header, ion channel, electro-chemical measuring apparatus and computer, wherein：Electro-chemical measuring apparatus is connected with computer, electrochemistry
The electrochemical signals of acquisition are passed to computer by measuring device, computer to carry out analyzing processing to the current signal of acquisition,
Export the numerical value of the galvanic corrosion electric current in the testing time；
The working end of electro-chemical measuring apparatus and ground terminal are separately connected two pieces of welded specimens to be measured, to acquire signal；Test
Probe includes the first test probe and the second test probe, and the two structure is identical and is separately fixed at two pieces of welded specimens to be measured
On, it is made of probe upper cover, probe body, probe down tube and magnetic fixing bolt, probe upper cover lower end is connected simultaneously with probe body
Sealing ring is set in the junction of the two, probe down tube is arranged in the lower face center of probe body, the lower face of probe body
Quadrangle is symmetrical arranged magnetic fixing bolt, magnetite is arranged in the end of magnetic fixing bolt, for being adsorbed on welding test zone；It is visiting
Sample contacts annulus is arranged in the lower face of head down tube；Upper and axial setting along probe upper cover is covered on probe through probe upper cover
Ion channel connecting hole, cavity is set in the inside of probe body and probe lower end, in probe upper cover, probe body and probe
After lower end links into an integrated entity, ion channel connecting hole and the coaxially connected integral solution storage chamber of cavity；The one of ion channel
End is arranged in the ion channel connecting hole of the probe upper cover of the first test probe, and the other end is arranged in the second test probe
In the ion channel connecting hole for upper cover of popping one's head in, to be connected to the solution storage chamber of two test probes, it is arranged in solution storage chamber
Solution under metal welding joints actual working environment, to simulate the working environment at position to be tested；It carries out as steps described below：
Step 1, test probe is fixed on the surface of sample to be tested using magnetite and magnetic fixing bolt and fitted closely, combined
Place carries out liquid-leakage preventing processing using insulating materials, and the surface of sample contacts annulus and sample to be tested fits closely at this time；
Step 2, preconfigured solution is added into solution storage chamber, it is to be measured to simulate the different working condition of sample to be tested
Part of the sample in sample contacts annulus is the test area of sample, and it is molten that preconfigured simulation is impregnated on this region
Liquid；Ion channel is recycled to be connected to the solution in the solution storage chamber of two test probes；
Step 3, sample to be tested is connected with the working end of electro-chemical measuring apparatus and ground terminal respectively, opens electrochemical measurement dress
It sets and is tested, while signal is recorded with computer；Computer carries out analyzing processing, output to the current signal of acquisition
Galvanic corrosion electric current can determine the anode and cathode region on weld joint samples surface according to galvanic corrosion current time figure and judge
The galvanic corrosion sensibility at each position of welding point is strong and weak, wherein：
The size of corrosion electric current density is calculated first, and corrosion electric current density is product of the corrosion current to corroded area, wherein
The area be on the sample to be tested being connected with electro-chemical measuring apparatus working end in the sample contacts annulus of test probe with (mould
It is quasi-) the sample to be tested area (i.e. the area of sample contacts annulus) that is in contact of solution, the following formula meter of corrosion electric current density
It calculates：
ID=I/s
S=π R2
Wherein, IDFor galvanic corrosion current density, I is galvanic corrosion electric current, and s is work area, and R is test probe work annulus
Radius (radius of sample contacts annulus)；When being tested using Multi probe, work area is and electrochemical operation device
The total working area (the sum of i.e. each sample contacts annulus area) of test probe that is connected of working end；
After calculating galvanic corrosion current density, it is known that the difference in cathodic region and anode region corrosion rate, i.e. ID=IPositive D-
ICloudy D, size and the positive and negative difference to judge anode and cathode and the two corrosion rate be worth by this, when the two from
When corrosion potential differs greatly, it is believed that IPositive DMuch larger than ICloudy D, i.e. ID≈IPositive D；It is rotten that metal part is calculated by corrosion electric current density
The velocity magnitude of erosion：It is Q=tI that its unit interval, which reacts electricity,D, the unit interval reaction gross mass be m=QM/Fn
Wherein t is the time, and n is the difference of the chemical valence of reactant and product, and F=96500 is Faraday constant, and M is that reaction is former
Sub- molal weight；
Corrosion rate A=m/ts
Wherein A units are g/m2H, s are electrode reaction area (work area used when calculating corrosion electric current density)；
Corrosion depth is B=(24*365A)/1000d
Wherein B units are mm/, and d is the density of material, unit g/cm3。
2. the assay method of corrosion depth, feature in the galvanic corrosion of metal welding joints position according to claim 1
It is, the base material area in sample to be tested, heat affected area or soldering area (i.e. weld metal zone) is arranged in the first test probe, and is arranged
The sample to be tested of first test probe is connected with the working end of electro-chemical measuring apparatus；Second test probe is arranged to be tested
The base material area of sample, heat affected area or soldering area (i.e. weld metal zone), and the sample to be tested and electricity of the second test probe are set
The ground terminal of chemical measurement device is connected；Cooperation can measure weld metal zone, heat affected area respectively between two probes；Heat affected area,
Base material；Between weld metal zone, base material, the galvanic corrosion electric current between different heat affected areas, the galvanic couple measured by the method
Corrosion current is the first test probe institute overlay area tissue under conducting state relative to the second test probe institute overlay area group
The difference for the corrosion current knitted.
3. the assay method of corrosion depth, feature in the galvanic corrosion of metal welding joints position according to claim 1
It is, before starting measurement, the sample to be tested of the first test probe of setting is connected simultaneously with the working end of electro-chemical measuring apparatus
Conducting state is formed, the ground terminal that the sample and electro-chemical measuring apparatus to be tested of the second test probe is arranged is in disconnection shape
State continues to read galvanic corrosion current signal later, waits for electricity when starting test to obtain the transient state pulse current of connection moment
After thermogalvanic corrision electric current is stablized, continue to stop acquisition after acquiring a period of time.
4. the assay method of corrosion depth, feature in the galvanic corrosion of metal welding joints position according to claim 1
It is, the insulating materials used in the step 1 of test is epoxide-resin glue, white silica gel, 502.
5. the assay method of corrosion depth, feature in the galvanic corrosion of metal welding joints position according to claim 1
Be, ion channel can be connected ion and can not conduct electrons, select plastic conduit and wherein fill ion can be connected
And can not conduct electrons material.
6. the assay method of corrosion depth, feature in the galvanic corrosion of metal welding joints position according to claim 5
It is, the silicone tube of filling saturation chlorination potassium gel is as ion channel.
7. the assay method of corrosion depth, feature in the galvanic corrosion of metal welding joints position according to claim 1
It is, test probe selects insulating materials to prepare on the whole.
8. the assay method of corrosion depth, feature in the galvanic corrosion of metal welding joints position according to claim 7
It is, insulating materials is polytetrafluoroethylene (PTFE).
9. the assay method of corrosion depth, feature in the galvanic corrosion of metal welding joints position according to claim 1
Be, if sample to be tested surface irregularity in the step 1 of test, coarse, or belongs to non-magnetic material, using white silica gel or
Epoxy resin directly gives fixation to test probe.
10. the assay method of corrosion depth, feature in the galvanic corrosion of metal welding joints position according to claim 3
It is, after waiting for that galvanic corrosion electric current is stablized, stops acquisition after continuing 200-1000s of acquisition.
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| CN105954186B (en) | 2018-09-11 |
| CN108918407B (en) | 2020-07-17 |
| CN108680493B (en) | 2020-07-17 |
| CN108680493A (en) | 2018-10-19 |
| CN105954186A (en) | 2016-09-21 |
| CN108918407A (en) | 2018-11-30 |
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