CN105954186A - Metal welded joint position couple corrosion determination apparatus and determination method thereof - Google Patents
Metal welded joint position couple corrosion determination apparatus and determination method thereof Download PDFInfo
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Abstract
The invention discloses a metal welded joint position couple corrosion determination apparatus and a determination method thereof. An electrochemical measurement device is connected with a computer, the working end of the electrochemical measurement device is connected with a first test joint, the grounding end of the electrochemical measurement device is connected with a second test joint, test probes comprise a first test probe and a second test probe, an integrated solution storage chamber is formed in every test probe after the upper cover, the main body and the lower end of every probe are connected to form one body, and the solution storage chambers of the two test probes are connected through an ion channel. When the apparatus is used, the test probes are fixedly arranged on the surface of a sample to be determined through a magnet and a magnetic fixed bolt, the combination undergoes liquid leakage prevention treatment through using an insulating material, a pre-prepared solution to every solution storage chamber in order to simulate different working states of the sample to be determined, and the solutions in the solution storage chambers of the two test probes are connected through the ion channel in order to realize test.
Description
Technical field
The invention belongs to the determinator field of galvanic corrosion, especially metal welding joints position electricity
The determinator of thermogalvanic corrision and assay method.
Background technology
Galvanic corrosion, also referred to as bimetallic corrosion.When two or more different metal or of the same race
After the different tissues (such as weld seam) of metal contacts in conducting medium, due to respective electrode potential not
Constitute corrosion galvanic cell together.Under electrolyte moisture film, form corrosion macro cell, can accelerate wherein
Nagative potential corrosion of metal.Affect galvanic corrosion because have environment, dielectricabsorption conductance, anode and cathode
Area ratio etc..Galvanic corrosion is generally dependent on the potential difference between dissimilar metal.Here current potential
The different tissues (such as weld seam) referring to two kinds of metals or same metal is (rotten at electrolyte solution respectively
Erosion medium) in actual potential, i.e. this metal corrosion potential in the solution.Wherein, generally,
Current potential high as negative electrode, current potential low as anode, particularly can shape when annode area is less
Become the galvanic couple pair of the big negative electrode of primary anode, make corrosion aggravate.In the case of other conditions are constant, electricity
Potential difference is the biggest, and corrosion rate may be the biggest.The current potential that is likely due to said herein is thermodynamic data,
Definite statement the speed of corrosion process cannot be gone out, the most sometimes because extraneous by thermodynamic data
The difference of environment there is also contrary conclusion.Therefore, the data to dynamic process, i.e. galvanic couple
The measurement of corrosion current just becomes particularly important.The corrosion current obtained by measurement can be calculated
Corrosion rate difference between different materials or different tissues.Thus judge that equipment is in specific environment
Corrosion behavior.
Welding is the important process link during engineering manufactures, and many parts are all by being welded to connect
Together.Owing to the tissue of Welded Joints inevitable in welding process produces impact, so i.e.
Making two connection members and wlding is all same material, and welding point is as uneven microstructure exists
Corrosive environment occurs galvanic corrosion.The method of research metal welding joints position corrosion mainly has:
Salt spray test, immersion test method (full leaching, a leaching etc.) and electrochemistry experiment method (potential measurement,
Galvanic Current measurement, polarization measurement, electrochemical impedance measurement etc.).The former can only obtain Weight loss data
With surface corrosion pattern, it is impossible to obtain corrosion current data, the longest.Although electrochemical method energy
Obtain Electrochemistry Information, but be mostly confined to study single area respectively, work prepared by laboratory
Make the shortcomings such as electrode also has processed complex time-consuming, more cannot realize online Non-Destructive Testing.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that metal welding joints position
The determinator of galvanic corrosion and assay method, on-line checking goes out each region, metal welding joints surface
Between corrosion Galvanic Current, thus judge anode region and cathode chamber, obtain metal welding joints table
The galvanic corrosion degree in each region, face, thus judge its galvanic corrosion sensitivity.
In order to solve above-mentioned technical problem, the present invention is achieved by the following technical solutions:
The determinator of metal welding joints position galvanic corrosion, including test probe, ion channel,
Electro-chemical measuring apparatus and computer, wherein:
Electro-chemical measuring apparatus is connected with computer, the electrochemistry letter that electro-chemical measuring apparatus will gather
Number pass to computer, computer to be analyzed the current signal gathered processing, output test
The numerical value of the galvanic corrosion electric current in the time；
The working end of electro-chemical measuring apparatus and earth terminal connect two pieces of welded specimens to be measured respectively, use
To gather signal；Test probe includes the first test probe and the second test probe, both structure phases
With and be separately fixed on two pieces of welded specimens to be measured, by probe upper cover, probe body, probe under
Pipe and magnetic gim peg form, and probe upper cover lower end is connected with probe body and in both junction
Arranging sealing ring, the lower surface central authorities of probe body arrange probe down tube, the lower surface of probe body
Corner be symmetrical arranged magnetic gim peg, the end at magnetic gim peg arranges Magnetitum, is used for adsorbing
At welding test zone；In the lower surface of probe down tube, sample contacts annulus is set；At probe upper cover
Upper and the axially arranged ion channel connecting hole running through probe upper cover along probe upper cover, main at probe
The inside of body and probe lower end arranges cavity, connects in probe upper cover, probe body and probe lower end
After integral, ion channel connecting hole and cavity coaxially connected all-in-one-piece solution storage chamber；
One end of ion channel is arranged on the ion channel connecting hole of the probe upper cover of the first test probe
In, its other end is arranged in the ion channel connecting hole of probe upper cover of the second test probe, with
The solution storage chamber of two test probes of connection.
In technique scheme, solution storage chamber arranges metal welding joints real work ring
Solution under border, to simulate the working environment at position to be tested.
In technique scheme, ion channel can turn on ion and cannot conduct electrons, select
Plastic conduit filling wherein can turn on ion and cannot the material of conduct electrons, such as sponge,
Solution, gel, it is preferably filled with the silica gel tube of saturated potassium chloride gel as ion channel.
In technique scheme, test probe selects insulant to prepare on the whole, and the most poly-four
Fluorothene.
In technique scheme, the first test probe is arranged on the mother metal district of sample to be tested, heat
The zone of influence or seam district (i.e. weld metal zone)；Second test probe is arranged on the mother metal of sample to be tested
District, heat affected area or seam district (i.e. weld metal zone), so, coordinating between two probes can
Measure weld metal zone, heat affected area respectively；Heat affected area, mother metal；Between weld metal zone, mother metal,
Galvanic corrosion electric current between different heat affected areas.
When using, carry out as steps described below:
Step 1, utilizes Magnetitum and magnetic gim peg that test probe is fixed on the surface of testing sample also
Fit tightly, use in junction insulant (such as epoxide-resin glue, white silica gel, 502) to enter
Row liquid-leakage preventing processes, and now sample contacts annulus fits tightly with the surface of testing sample
In step 1, if testing sample surface irregularity, coarse, or belong to non-magnetic material
Material, uses white silica gel or epoxy resin directly to fix test probe.
Step 2, adds the solution being pre-configured with in solution storage chamber, to simulate testing sample not
Same duty, testing sample part in sample contacts annulus is the test area of sample,
This region is soaked the simulated solution being pre-configured with；Recycling ion channel two tests of connection
Solution in the solution storage chamber of probe.
Step 3, is connected with working end and the earth terminal of electro-chemical measuring apparatus respectively by testing sample,
Open electro-chemical measuring apparatus to test, with computer, signal is given record simultaneously.
In technique scheme, the first test probe is arranged on the mother metal district of sample to be tested, hot shadow
Ring district or seam district (i.e. weld metal zone), and sample to be tested and the electrification of the first test probe are set
The working end learning measurement apparatus is connected；Second test probe be arranged on sample to be tested mother metal district,
Heat affected area or seam district (i.e. weld metal zone), and arrange the sample to be tested of the second test probe with
The earth terminal of electro-chemical measuring apparatus is connected；So, coordinate and can survey respectively between two probes
Determine weld metal zone, heat affected area；Heat affected area, mother metal；Between weld metal zone, mother metal, different
Galvanic corrosion electric current between heat affected area.The galvanic corrosion electric current recorded by the method is conducting
Under state, the first test probe institute overlay area tissue is relative to the second test probe institute overlay area group
The difference of the corrosion current knitted, i.e. I=I1-I2。
In technique scheme, before the start of the measurement, the sample to be tested of the first test probe is set
Product are connected with the working end of electro-chemical measuring apparatus and form conducting state, arrange the second test probe
The earth terminal of sample to be tested and electro-chemical measuring apparatus be off, when starting to test
To obtain connecting the transient state pulse current of moment.
In technique scheme, computer recording electro-chemical measuring apparatus the signal gathered,
The sample to be tested of the second test probe and the earth terminal conducting moment of electro-chemical measuring apparatus are set,
The moment transient state pulse current caused due to potential difference, continues to read galvanic corrosion electric current afterwards
Signal, after treating galvanic corrosion current stabilization, stops gathering (such as after continuing to gather a period of time
200—1000s).And the data obtained is copied in TXT document or the log file of extended formatting
In.The current signal gathered is analyzed processing by computer, exports galvanic corrosion electric current, according to
Galvanic corrosion current time figure may determine that the anode and cathode region on weld joint samples surface and judges weldering
The galvanic corrosion sensitivity at each position of joint is strong and weak.
Compared with prior art, the invention has the beneficial effects as follows: this device can detect metal welding
Connect the corrosion Galvanic Current between each region of joint surface, thus judge anode region and cathode chamber,
To the galvanic corrosion degree in each region, metal welding joints surface, thus judge that its galvanic corrosion is quick
Perception.
Accompanying drawing explanation
Fig. 1 is the test probe structural representation of the present invention；
Fig. 2 is the heat affected area galvanic corrosion Current experiments wiring schematic diagram to mother metal district of the present invention；
Fig. 3 is the elementary diagram signal of the present invention；
Fig. 4 is the heat affected area galvanic couple corruption to mother metal district that technical solution of the present invention carries out performance test
Erosion map of current；
Fig. 5 is the heat affected area galvanic couple corruption to seam district that technical solution of the present invention carries out performance test
Erosion map of current；
Fig. 6 is that technical solution of the present invention carries out the mother metal district of the performance test galvanic corrosion to seam district
Map of current.
Wherein 1 is ion channel connecting hole, and 2 is probe upper cover, and 3 is sealing ring, and 4 is main for probe
Body, 5 is solution storage chamber, and 6 is probe down tube, and 7 is magnetic gim peg, and 8 is sample contacts circle
Ring, 9 is Magnetitum, and 10 is working end, and 11 is earth terminal, and 12 is seam district, and 13 is heat affected area,
14 is mother metal district, and 15 is the first test probe, and 16 is the second test probe, and 17 is the first test
The work annulus of probe, 18 is the work annulus of the second test probe, and 19 is ion channel, and 20 are
Electro-chemical measuring apparatus, 21 is computer.
Detailed description of the invention
With specific embodiment, the present invention is described in further detail below in conjunction with the accompanying drawings:
As shown in attached Figure 13, the determinator of the metal welding joints position galvanic corrosion of the present invention,
Including test probe, ion channel, electro-chemical measuring apparatus and computer, wherein:
Electro-chemical measuring apparatus is connected with computer, the electrochemistry letter that electro-chemical measuring apparatus will gather
Number pass to computer, computer to be analyzed the current signal gathered processing, output test
The numerical value of the galvanic corrosion electric current in the time；
The working end of electro-chemical measuring apparatus and earth terminal connect two pieces of welded specimens to be measured respectively, use
To gather signal；Test probe includes the first test probe and the second test probe, both structure phases
With and be separately fixed on two pieces of welded specimens to be measured, by probe upper cover, probe body, probe under
Pipe and magnetic gim peg form, and probe upper cover lower end is connected with probe body and in both junction
Arranging sealing ring, the lower surface central authorities of probe body arrange probe down tube, the lower surface of probe body
Corner be symmetrical arranged magnetic gim peg, the end at magnetic gim peg arranges Magnetitum, is used for adsorbing
At welding test zone；In the lower surface of probe down tube, sample contacts annulus is set；At probe upper cover
Upper and the axially arranged ion channel connecting hole running through probe upper cover along probe upper cover, main at probe
The inside of body and probe lower end arranges cavity, connects in probe upper cover, probe body and probe lower end
After integral, ion channel connecting hole and cavity coaxially connected all-in-one-piece solution storage chamber；
One end of ion channel is arranged on the ion channel connecting hole of the probe upper cover of the first test probe
In, its other end is arranged in the ion channel connecting hole of probe upper cover of the second test probe, with
The solution storage chamber (and solution) of two test probes of connection.
In technique scheme, solution storage chamber arranges metal welding joints real work ring
Solution under border, to simulate the working environment at position to be tested.
In technique scheme, ion channel can turn on ion and cannot conduct electrons, select
Plastic conduit filling wherein can turn on ion and cannot the material of conduct electrons, such as sponge,
Solution, gel, it is preferably filled with the silica gel tube of saturated potassium chloride gel as ion channel.
In technique scheme, test probe selects insulant to prepare on the whole, and the most poly-four
Fluorothene.
In technique scheme, the first test probe is arranged on the mother metal district of sample to be tested, heat
The zone of influence or seam district (i.e. weld metal zone)；Second test probe is arranged on the mother metal of sample to be tested
District, heat affected area or seam district (i.e. weld metal zone), so, coordinating between two probes can
Measure weld metal zone, heat affected area respectively；Heat affected area, mother metal；Between weld metal zone, mother metal,
Galvanic corrosion electric current between different heat affected areas.
When using, carry out as steps described below:
Step 1, utilizes Magnetitum and magnetic gim peg that test probe is fixed on the surface of testing sample also
Fit tightly, use in junction insulant (such as epoxide-resin glue, white silica gel, 502) to enter
Row liquid-leakage preventing processes, and now sample contacts annulus fits tightly with the surface of testing sample
In step 1, if testing sample surface irregularity, coarse, or belong to non-magnetic material
Material, uses white silica gel or epoxy resin directly to fix test probe.
Step 2, adds the solution being pre-configured with in solution storage chamber, to simulate testing sample not
Same duty, testing sample part in sample contacts annulus is the test area of sample,
This region is soaked the simulated solution being pre-configured with；Recycling ion channel two tests of connection
Solution in the solution storage chamber of probe.
Step 3, is connected with working end and the earth terminal of electro-chemical measuring apparatus respectively by testing sample,
Open electro-chemical measuring apparatus to test, with computer, signal is given record simultaneously.
In technique scheme, the first test probe is arranged on the mother metal district of sample to be tested, hot shadow
Ring district or seam district (i.e. weld metal zone), and sample to be tested and the electrification of the first test probe are set
The working end learning measurement apparatus is connected；Second test probe be arranged on sample to be tested mother metal district,
Heat affected area or seam district (i.e. weld metal zone), and arrange the sample to be tested of the second test probe with
The earth terminal of electro-chemical measuring apparatus is connected；So, coordinate and can survey respectively between two probes
Determine weld metal zone, heat affected area；Heat affected area, mother metal；Between weld metal zone, mother metal, different
Galvanic corrosion electric current between heat affected area.The galvanic corrosion electric current recorded by the method is conducting
Under state, the first test probe institute overlay area tissue is relative to the second test probe institute overlay area group
The difference of the corrosion current knitted, i.e. I=I1-I2。
In technique scheme, before the start of the measurement, the sample to be tested of the first test probe is set
Product are connected with the working end of electro-chemical measuring apparatus and form conducting state, arrange the second test probe
The earth terminal of sample to be tested and electro-chemical measuring apparatus be off, when starting to test
To obtain connecting the transient state pulse current of moment.
In technique scheme, computer recording electro-chemical measuring apparatus the signal gathered, setting
Put the sample to be tested of the second test probe and the earth terminal conducting moment of electro-chemical measuring apparatus, by
In the moment transient state pulse current that potential difference is caused, continue afterwards to read galvanic corrosion electric current letter
Number, after treating galvanic corrosion current stabilization, stop gathering (such as 200 after continuing to gather a period of time
—1000s).And the data obtained is copied in TXT document or in the log file of extended formatting.
The current signal gathered is analyzed processing by computer, exports galvanic corrosion electric current, according to galvanic couple
Corrosion current time diagram may determine that the anode and cathode region on weld joint samples surface and judges that welding connects
The galvanic corrosion sensitivity at each position is strong and weak.
The process of galvanic corrosion current data.Before analyzing corrosion current, first should calculate corrosion
The size of electric current density.Corrosion electric current density is the corrosion current product to corroded area, wherein,
This area is that on the sample to be tested being connected with electro-chemical measuring apparatus working end, the sample of test probe connects
Touch sample to be tested area (the i.e. face of sample contacts annulus contacted in annulus with (simulation) solution
Long-pending), rather than (to be tested with what electro-chemical measuring apparatus earth terminal was connected to the work area of electrode tip
The sample to be tested area contacted with simulated solution in the sample contacts annulus of test probe on sample).Its
Corrosion electric current density equation below calculates:
ID=I/s
S=π R2
Wherein, IDFor galvanic corrosion electric current density, I is galvanic corrosion electric current, and s is work area, R
For test probe work annular radii (radius of sample contacts annulus).
When using Multi probe to test, its work area is and the work of electrochemical operation device
The total working area (the most each sample contacts annulus area sum) of the test probe that end is connected.
Galvanic corrosion behavior and the determination corroding lack of uniformity.Calculating galvanic corrosion electric current density
Afterwards, we are simply aware of the difference on cathode chamber and anode region corrosion rate, i.e. ID=ISun D-ICloudy D。
Although can also judge that whichever is anode by this worth size with positive and negative, whichever is negative electrode, with
And the difference of the two corrosion rate.But the absolute value of the corrosion rate of the two cannot be known.But,
Generally when the material generation galvanic corrosion that two kinds of corrosion potentials are different, high cloudy of current potential
Polarizing in pole, corrosion rate declines, current potential low by anode polarization, corrosion rate rises.When the two
Corrosion potential when differing greatly, it is believed that ISun DMuch larger than ICloudy D, i.e. ID≈ISun D.And work as
When the corrosion potential difference of the two is less, further should be counted in conjunction with tests such as polarization curves
Calculate.
The determination of metal welding joints corrosion rate.When the corrosion potential of the two differs greatly,
The velocity magnitude of metal local corrosion can be calculated by corrosion electric current density.
Its unit interval reaction electricity is Q=tID
Unit interval reaction gross mass is m=QM/Fn
Wherein t is the time, and n is the difference of reactant and the quantivalence of product, and F=96500 is farad
Constant, M is reaction of atomic molal weight.
Therefore corrosion rate A=m/ts
Wherein A unit is g/m2H, s are that electrode reaction area (is adopted when i.e. calculating corrosion electric current density
Work area).
May also indicate that corrosion depth is called B=(24*365A)/1000d
Wherein B unit be mm/, d be the density of material, unit is g/cm3
To above-mentioned formula, bring I respectively intoD、ISun DAnd ICloudy DThe local of zones of different can be calculated
The size of corrosion rate.
First weld joint samples with the contact portion of solution in the work annulus of the first test probe is
Working electrode, in the work annulus of the second weld joint samples and the second test probe, solution contacts
Part is to electrode；The diameter of annulus of working in probe down tube choose should be not more than mensuration tissue
Width be as the criterion, choose a diameter of 5mm；Should be by regulation magnetic between work annulus and test button
Gim peg ensures to be in close contact and carry out liquid-leakage preventing work；Probe body solution storage intracavity should add
Solution needed for welding point experiment；Ion guide threads a pipe thickness should be consistent with connecting hole molten to prevent
Liquid spills；Ion guide is threaded a pipe and is selected flexible material (silica gel tube) to protect with probe body internal solution
Hold good contact.
The test probe using the present invention tests the electricity of the galvanic corrosion between welding point different tissues
The step of stream is as follows:
(1) test probe down tube and magnetic gim peg are connected in probe body, and survey first
Probe header uses magnetic gim peg to make the absorption of work annulus weld first respectively with the second test probe
On the different tissues of joint and the second welding point, it is relative that the present embodiment determines heat affected area respectively
In mother metal district, heat affected area relative to seam district, mother metal district relative to seam district galvanic corrosion electricity
The size of stream.Therefore the work annulus of the first test probe and the second test probe should under often organizing test
Absorption is at corresponding tissue.Backward probe body solution storage intracavity add 3.5wt% chlorination
Sodium water solution (sea water simulation liquid).Sample in the present embodiment is T4003 rustless steel, and surface is
Cross grinding process, experimentation does not occur spilling of solution, therefore is not required to further leakproof
Liquid measure.Place into sealing ring and probe upper cover be tightened in probe body top after injecting solution,
Inside is contained the silica gel tube of saturated potassium chloride gel afterwards insert flexible ion guide and thread a pipe connecting hole
In, and ensure and solution close contact, make to form ion guide circulation passage between two probes.
(2) test probe and electrochemistry work do the connection at station: the line graph of this experiment as in figure 2 it is shown,
Fig. 2 is the heat affected area wiring diagram to the galvanic corrosion testing current in mother metal district, to its hetero-organization it
Between galvanic corrosion testing current, the work tissue that covered of annulus should be different.Merit attention
: in order to obtain the corrosion current of turn-on transients between different tissues, should ensure that electrification before test
Learn work station working end contact with the first weld joint samples, and make electrochemical workstation earth terminal and
Second weld joint samples disconnects.After test starts, then by electrochemical workstation earth terminal and
Two weld joint samples are connected.
(3) setting of test parameters: this experiment use Shanghai Electric Applicance Co., Ltd of pros produce
ZF-100 electrochemical workstation carries out transient state Galvanic Current test, and rate of scanning is 20Hz, during scanning
Between be 15 minutes.This experiment is to the galvanic couple between T4003 stainless steel welded joint sample different tissues
Corrosion current figure is as Figure 4-Figure 6.By the big I of stable state galvanic corrosion electric current in Fig. 4-6
To obtain the difference of this material different tissues average corrosion rate in the present context.
By measure and calculation, the calculating knot of the meansigma methods of the stable state galvanic corrosion electric current between zones of different
The most as shown in the table:
In this galvanic corrosion testing current, if the electric current obtained on the occasion of, then represent working electrode
Corrosion rate more than to electrode, be the corruption in the region that the first test probe work annulus is covered
Erosion speed is faster.And difference that the value of the biggest galvanic corrosion electric current represents corrosion rate is the biggest.By
This, we can show that between three kinds of tissues, the relation of corrosion rate is: ＞ mother metal district, heat affected area
＞ seam district.
At the test initial stage, the moment of connection electrochemical workstation earth terminal and the second welding point obtains
Transient state galvanic corrosion sense of current and size may determine that electric potential relation and the difference of the two.At this
In experiment, three transient state galvanic corrosion electric currents of obtaining of test on the occasion of, then may determine that three kinds of groups
Between knitting, the relation of corrosion potential is: ＜ mother metal district ＜ seam district, heat affected area.Pass through relation above
Understanding, between T4003 stainless steel welded joint different tissues, corrosion proof relation is: heat affected area ＜
Mother metal district ＜ seam district.
Above the present invention is described in detail, but described content has been only the preferable enforcement of the present invention
Example, it is impossible to be considered the practical range for limiting the present invention.All made according to the present patent application scope
Impartial change and improvement etc., within all should still belonging to the patent covering scope of the present invention.
Claims (10)
1. the determinator of metal welding joints position galvanic corrosion, it is characterised in that include test
Probe, ion channel, electro-chemical measuring apparatus and computer, wherein:
Electro-chemical measuring apparatus is connected with computer, the electrochemistry letter that electro-chemical measuring apparatus will gather
Number pass to computer, computer to be analyzed the current signal gathered processing, output test
The numerical value of the galvanic corrosion electric current in the time；
The working end of electro-chemical measuring apparatus and earth terminal connect two pieces of welded specimens to be measured respectively, use
To gather signal；Test probe includes the first test probe and the second test probe, both structure phases
With and be separately fixed on two pieces of welded specimens to be measured, by probe upper cover, probe body, probe under
Pipe and magnetic gim peg form, and probe upper cover lower end is connected with probe body and in both junction
Arranging sealing ring, the lower surface central authorities of probe body arrange probe down tube, the lower surface of probe body
Corner be symmetrical arranged magnetic gim peg, the end at magnetic gim peg arranges Magnetitum, is used for adsorbing
At welding test zone；In the lower surface of probe down tube, sample contacts annulus is set；At probe upper cover
Upper and the axially arranged ion channel connecting hole running through probe upper cover along probe upper cover, main at probe
The inside of body and probe lower end arranges cavity, connects in probe upper cover, probe body and probe lower end
After integral, ion channel connecting hole and cavity coaxially connected all-in-one-piece solution storage chamber；
One end of ion channel is arranged on the ion channel connecting hole of the probe upper cover of the first test probe
In, its other end is arranged in the ion channel connecting hole of probe upper cover of the second test probe, with
The solution storage chamber of two test probes of connection, arranges metal welding joints real in solution storage chamber
Solution under the working environment of border, to simulate the working environment at position to be tested.
The determinator of metal welding joints position the most according to claim 1 galvanic corrosion, its
Be characterised by, ion channel can turn on ion and cannot conduct electrons, select plastic conduit and
Wherein fill can turn on ion and cannot the material of conduct electrons, such as sponge, solution, gel,
It is preferably filled with the silica gel tube of saturated potassium chloride gel as ion channel.
The determinator of metal welding joints position the most according to claim 1 galvanic corrosion, its
Being characterised by, test probe selects insulant to prepare on the whole, such as politef.
The determinator of metal welding joints position the most according to claim 1 galvanic corrosion, its
Being characterised by, the first test probe is arranged on mother metal district, heat affected area or the weldering of sample to be tested
Close district (i.e. weld metal zone)；Second test probe is arranged on the mother metal district of sample to be tested, heat affected area
Or seam district (i.e. weld metal zone).
5. the assay method of metal welding joints position galvanic corrosion, it is characterised in that according to following
Step is carried out:
Step 1, utilizes Magnetitum and magnetic gim peg that test probe is fixed on the surface of testing sample also
Fit tightly, use in junction insulant to carry out liquid-leakage preventing process, now sample contacts annulus
Fit tightly with the surface of testing sample；
Step 2, adds the solution being pre-configured with in solution storage chamber, to simulate testing sample not
Same duty, testing sample part in sample contacts annulus is the test area of sample,
This region is soaked the simulated solution being pre-configured with；Recycling ion channel two tests of connection
Solution in the solution storage chamber of probe；
Step 3, is connected with working end and the earth terminal of electro-chemical measuring apparatus respectively by testing sample,
Open electro-chemical measuring apparatus to test, with computer, signal is given record simultaneously.
The assay method of metal welding joints position the most according to claim 5 galvanic corrosion,
It is characterized in that, in step 1 use insulant be epoxide-resin glue, white silica gel, 502.
The assay method of metal welding joints position the most according to claim 5 galvanic corrosion,
It is characterized in that, if testing sample surface irregularity in step 1, coarse, or belong to nonmagnetic
Material, use white silica gel or epoxy resin that test probe is directly fixed.
The assay method of metal welding joints position the most according to claim 5 galvanic corrosion,
It is characterized in that, the first test probe be arranged on the mother metal district of sample to be tested, heat affected area or
Seam district (i.e. weld metal zone), and sample to be tested and the electrochemical measurement dress of the first test probe is set
The working end put is connected；Second test probe is arranged on the mother metal district of sample to be tested, heat affected area
Or seam district (i.e. weld metal zone), and sample to be tested and the electrochemistry survey of the second test probe is set
The earth terminal of amount device is connected；Coordinate between two probes and can measure weld metal zone, heat affected area respectively；
Heat affected area, mother metal；Between weld metal zone, mother metal, the galvanic couple between different heat affected areas is rotten
Erosion electric current, the galvanic corrosion electric current recorded by the method is the first test probe institute under conducting state
Overlay area tissue is relative to the difference of the corrosion current of the second test probe institute overlay area tissue.
The assay method of metal welding joints position the most according to claim 5 galvanic corrosion,
It is characterized in that, before starting to measure, sample to be tested and the electrochemistry of the first test probe are set
The working end of measurement apparatus is connected and forms conducting state, arranges the sample to be tested of the second test probe
Product are off with the earth terminal of electro-chemical measuring apparatus, when starting to test to be connected
The transient state pulse current of moment, continues afterwards to read galvanic corrosion current signal, treats galvanic corrosion electricity
After stream is stable, stop gathering after continuing to gather a period of time, such as 200 1000s.
The assay method of metal welding joints position the most according to claim 5 galvanic corrosion,
It is characterized in that, the current signal gathered is analyzed processing by computer, output galvanic corrosion electricity
Stream, may determine that the anode and cathode region on weld joint samples surface according to galvanic corrosion current time figure
And judge that the galvanic corrosion sensitivity at each position of welding point is strong and weak, wherein:
First calculating the size of corrosion electric current density, corrosion electric current density is that corrosion current is to erosional surface
Long-pending product, wherein, this area is on the sample to be tested being connected with electro-chemical measuring apparatus working end
The sample to be tested area contacted with (simulation) solution in the sample contacts annulus of test probe is (i.e.
The area of sample contacts annulus), its corrosion electric current density equation below calculates:
ID=I/s
S=π R2
Wherein, IDFor galvanic corrosion electric current density, I is galvanic corrosion electric current, and s is work area, R
For test probe work annular radii (radius of sample contacts annulus)；Survey when using Multi probe
During examination, what its work area was the test probe that is connected with the working end of electrochemical operation device is total
Work area (the most each sample contacts annulus area sum)；
It is known that cathode chamber and anode region corrosion rate after calculating galvanic corrosion electric current density
Difference, i.e. ID=ISun D-ICloudy D, by this worth size with positive and negative to judge anode and negative electrode, with
And the difference of the two corrosion rate, when the corrosion potential of the two differs greatly, it is believed that ISun DFar
More than ICloudy D, i.e. ID≈ISun D；The speed being calculated metal local corrosion by corrosion electric current density is big
Little: its unit interval reaction electricity is Q=tID, the unit interval reaction gross mass be m=QM/Fn
Wherein t is the time, and n is the difference of reactant and the quantivalence of product, and F=96500 is farad
Constant, M is reaction of atomic molal weight；
Corrosion rate A=m/ts
Wherein A unit is g/m2H, s are that electrode reaction area (is adopted when i.e. calculating corrosion electric current density
Work area)；
Corrosion depth is B=(24*365A)/1000d
Wherein B unit be mm/, d be the density of material, unit is g/cm3。
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| CN201810297601.1A CN108680492B (en) | 2016-04-29 | 2016-04-29 | Method for measuring corrosion depth in galvanic corrosion of metal welding joint part |
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| CN106979920A (en) * | 2017-05-08 | 2017-07-25 | 哈电集团（秦皇岛）重型装备有限公司 | Simulate the sample of HTHP and flow media and apply its simulation experiment method |
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| CN108562625A (en) * | 2018-03-23 | 2018-09-21 | 天津大学 | The non-destructive testing device and method of integral type on-line checking metal soldering tip welding position galvanic corrosion sensibility |
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| CN108680492B (en) | 2020-09-01 |
| CN108680493B (en) | 2020-07-17 |
| CN105954186B (en) | 2018-09-11 |
| CN108680492A (en) | 2018-10-19 |
| CN108918407B (en) | 2020-07-17 |
| CN108680493A (en) | 2018-10-19 |
| CN108918407A (en) | 2018-11-30 |
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