CN105319158B - The cannot-harm-detection device and method of online prison detection metal welding jointses position galvanic corrosion sensitiveness - Google Patents
The cannot-harm-detection device and method of online prison detection metal welding jointses position galvanic corrosion sensitiveness Download PDFInfo
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- CN105319158B CN105319158B CN201510087246.1A CN201510087246A CN105319158B CN 105319158 B CN105319158 B CN 105319158B CN 201510087246 A CN201510087246 A CN 201510087246A CN 105319158 B CN105319158 B CN 105319158B
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Abstract
The invention discloses the cannot-harm-detection device and method of online prison detection metal welding jointses position galvanic corrosion sensitiveness, first according to welded seam area surface configuration and the suitable electrode probe beam of material selection and adjustment probe beam curved surface.Suitable reference electrode and salt bridge are chosen according to electrolyte solution, beam will be popped one's head in using appropriate device and reference electrode is fixed.Then using device collection current potential and current signal with zero resistance circuit, the probe of all electrode probe beams is sampled successively.Finally the current signal of collection is analyzed and processed, output current distribution map, determine the anode and cathode region of specimen surface and judge that the galvanic corrosion sensitiveness at each position of welding point is strong and weak.The method can realize that each position galvanic corrosion sensitiveness of continuous online prison detection metal welding jointses is strong and weak, the accuracy to metal welding jointses position galvanic corrosion sensitivity Detection under nondestructive state is ensure that, and then greatly improves the reliability and accuracy of metal welding jointses life appraisal.
Description
Technical field
The present invention relates to technical field of nondestructive testing, the current signal particular by collection welding point position surface enters
Row drawing obtains current distributing figure, and then obtains the galvanic corrosion sensitive information of specimen surface.
Background technology
Galvanic corrosion (also referred to as contact corrosion), refers to when two or more different metal is contacted in conducting medium
Afterwards, corrosion galvanic cell is constituted because respective electrode potential is different.The metal of corrosion potential calibration is negative electrode, occurs negative electrode anti-
Should, cause its corrosion process to be suppressed；And the more negative metal of current potential is anode, occurs anode reaction, cause its corrosion process
Accelerate, the galvanic couple pair of the big negative electrode of primary anode, corrosion aggravation can be particularly formed when annode area is smaller.Foundation in current navigation mark
Galvanic Current size judges galvanic corrosion sensitivity.
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 produces influence in welding process, even if so two connection members and wlding are all of the same race
Material, welding point are as galvanic corrosion occurs in corrosive environment for uneven microstructure.
The method of research metal welding jointses position corrosion mainly has：Salt spray test, immersion test method (full leaching, leaching etc.)
With electrochemistry experiment method (potential measurement, Galvanic Current measurement, polarization measurement, electrochemical impedance measurement etc.).These often can only
Obtain Weight loss data and surface corrosion pattern, it is impossible to obtain corrosion current data.And time-consuming.Although electrochemical method can be obtained
It is confined to study single area respectively to Electrochemistry Information, but mostly, hardly results in the real-time current etc. when occurring galvanic corrosion
Corrosion information, can not realize online Non-Destructive Testing.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of online prison detection metal welding jointses position
The cannot-harm-detection device of galvanic corrosion sensitiveness.The device can go out the corrosion in each region in metal welding jointses surface with on-line checking
Galvanic Current, so as to judge anode region and cathodic region, obtains the galvanic corrosion degree and corrosion situation of change in each region, so as to sentence
Break and its galvanic corrosion sensitiveness.
It is an object of the invention to provide a kind of nothing of online prison detection metal welding jointses position galvanic corrosion sensitiveness
Damage detection method.The method can supervise the corrosion Galvanic Current of detection metal welding jointses portion faces online, so as to obtain gold
Belong to the sensitiveness of each position galvanic corrosion of welding point.
The purpose of the present invention is achieved by following technical proposals.
The cannot-harm-detection device of online prison detection metal welding jointses position galvanic corrosion sensitiveness, including to be measured connect
Head sample (welding point position to be measured sample), conductive membrane, electrolyte solution container, reference electrode, multi-channel electrode probe, electricity
Chemical measurement device and computer, the weld joint samples to be measured include welding point mother metal area and welding point weld metal zone,
The welding point weld metal zone occupy the centre position of the welding point to be measured, welding point weld metal zone surface with it is described
Welding point mother metal area is parallel, and the area of the multi-channel electrode probe is more than the area of the welding point weld metal zone, described
Multi-channel electrode, which is popped one's head in, is arranged on the upper surface of the weld joint samples to be measured, and the multi-channel electrode probe is by phenolic resin
With metal electrode bar composition, the metal electrode bar is distributed in the phenolic resin in M rows N row are equidistant, and the M is more than etc.
It is less than or equal to 20 in 5, the N is more than or equal to 5 and is less than or equal to 20, and the electrolyte solution container includes two electricity of identical first
Electrolyte solution container and the second electrolyte solution container, the first electrolyte solution container and second electrolyte solution hold
Device is symmetrically arranged at the both sides of the weld joint samples to be measured, and the bottom popped one's head in the multi-channel electrode is probe inspection
Be provided with the conductive membrane between the upper surface for surveying end and the weld joint samples to be measured, the film surface of the conductive membrane respectively with
The bottom of the multi-channel electrode probe and the upper surface of the weld joint samples to be measured are in close contact, and the conductive membrane
Two side ends infiltrate in the electrolyte solution of the first electrolyte solution container and the second electrolyte solution container respectively,
One end of the reference electrode is placed on by salt bridge in the electrolyte solution of the second electrolyte solution container, described to lead to more
The top of road electrode probe is Signal connector end, the reference electrode, the bottom surface of the welding point weld metal zone respectively by leading
Line is connected with the signal acquisition terminal of the electro-chemical measuring apparatus, demarcation reference electrode end and earth terminal, the electrochemical measurement
Device includes zero resistance circuit, and the signal output part of the electro-chemical measuring apparatus is connected with the computer.
In the above-mentioned technical solutions, for the complicated detection surface of surface configuration, then the brushing phenolic aldehyde respectively of electrode bar every
Resin, enclosed electrode rod non-working surface only exposes head working face, and each electrode bar face area is identical, by electrode bar
Beam working face constitutes the curved surface beam for being suitable for test piece surface configuration.
In the above-mentioned technical solutions, it is used as reference electrode from saturated calomel electrode.
In the above-mentioned technical solutions, in the first electrolyte solution container and the second electrolyte solution container
Equipped with 3.5%NaCl solution.
In the above-mentioned technical solutions, the ion conductive membrane is that can turn on ion, but can not conduct electrons, such as sea
Silk floss, timber, filter paper, bamboo, are preferably soaked with the filter paper of 3.5%NaCl solution as ion conductive membrane.
In the above-mentioned technical solutions, the metal electrode bar use Q235 models carbon steel, the metal electrode bar it is straight
Footpath is 1.0-1.5mm, preferably 1.2mm.
Wherein, equidistantly it is fixed on multi-channel electrode probe by the carbon steel rod of 100 Q235 models in phenolic resin and is
Example, metal electrode bar is arranged in 10 rows 10, and 0.2mm is arranged in phenolic resin at equal intervals, the signal acquisition of electro-chemical measuring apparatus
End includes 100 signal acquisition contacts (not marked in figure).
The top and the specific connected mode of the signal acquisition terminal of electro-chemical measuring apparatus that multi-channel electrode is popped one's head in are：Lead to more
100 metal electrode bars of road electrode probe by 100 wires respectively with the signal acquisition terminal of electro-chemical measuring apparatus 100
Individual signal acquisition contact connection.
Electro-chemical measuring apparatus is controlled by the single-chip microcomputer being embedded, suitable successively according to the position of 100 metal electrode bars
Sequence gathers the current signal of 100 signal acquisition points.
In the above-mentioned technical solutions, weld joint samples to be measured are the welding point of Q235 steel, whole welding point part
Surface area be 15*15mm.
Connect after whole device, weld joint samples to be measured are connect by the conductive membrane with being impregnated with 3.5%NaCl solution
Touch, its surface can corrode.During detection, make welding point weld metal zone and the electrochemical testing device of weld joint samples to be measured
Earth terminal is turned on, and the demarcation reference electrode end of reference electrode and electro-chemical measuring apparatus is turned on；Filled by electrochemical measurement
Embedded single-chip microcomputer control is put, each metal electrode bar that multi-channel electrode is popped one's head in is not being connect in the same time with to be measured respectively
Head sample is turned on and gathers corresponding current signal, and the current signal of collection is defeated by the meter being connected with electro-chemical measuring apparatus
Calculation machine；Computer is analyzed and processed to the current signal of collection, output current distribution map.It can be determined according to current distributing figure
The anode and cathode region on weld joint samples surface simultaneously judges that the galvanic corrosion sensitiveness at each position of welding point is strong and weak.
The lossless detection method of online prison detection metal welding jointses position galvanic corrosion sensitiveness, enters as steps described below
OK：
Step 1：By conductive membrane be placed in weld joint samples to be measured and by phenolic resin and metal electrode bar constitute it is many
Between channel electrode probe, the bottom popped one's head in the multi-channel electrode is probe test side and the weld joint samples to be measured
Upper surface between be provided with the conductive membrane, the metal electrode bar by the conductive membrane in order be emitted on it is described to be measured
Weld joint samples upper surface, the metal electrode bar is distributed in the phenolic resin in M rows N row are equidistant, and the M is more than
It is less than or equal to 20 equal to 5, the N is more than or equal to 5 and is less than or equal to 20, and reference electrode surface treatment is standby；
Step 2：It is described to lead in the electrolyte solution that the reference electrode is fixed on to the first electrolyte container by salt bridge
The two ends of logical film are infiltrated in the electrolyte solution of first electrolyte container and the second electrolyte container simultaneously；
Step 3：Current signal is gathered using the electro-chemical measuring apparatus with zero resistance circuit, wherein the multichannel is electric
Pole probe is connected with the electro-chemical measuring apparatus working end, and the weld joint samples lower surface to be measured is surveyed with the electrochemistry
Trial assembly is put earth terminal and is connected, the reference electrode (plus salt bridge) and the reference electrode end set in the electrochemical testing device
It is connected；
Step 4：Multi-channel electrode probe each metal electrode bar respectively not in the same time with weld joint samples to be measured
Conducting composition galvanic couple pair, and corresponding current signal is gathered, until the sampling of all metal electrode bars terminates；
Step 5：The current signal of collection is analyzed and processed, output current distribution map is each in current distributing figure
Root electrode all correspond to a two-dimensional coordinate, i.e. current distributing figure and show the metal electrode bar array institute for arranging and being equally spaced in M rows N
The CURRENT DISTRIBUTION on corresponding weld joint samples surface to be measured, different corrosion current coordinates are told by current distributing figure coordinate
The position on corresponding weld joint samples surface to be measured, corrosion current value is bigger, shows that the galvanic corrosion sensitiveness of the position is got over
By force；Such as first electrode correspond to coordinate (1,1), second electrode respective coordinates (1,2), until the tenth electrode pair should be sat
Mark (1,10)；But abscissa is changed since the tenth electrode, coordinate (2,1) is correspond to, similarly until the 20th
Root electrode respective coordinates (2,10), then abscissa change again.I.e. every ten electrodes, abscissa changes once, until the
100 electrode pairs answer (10,10), determine the anode and cathode region of specimen surface and judge that the galvanic corrosion at each position of welding point is quick
It is perceptual strong and weak.
Reference electrode is used as from saturated calomel electrode.
It is molten that 3.5%NaCl is respectively arranged with the first electrolyte solution container and the second electrolyte solution container
Liquid.
Conductive membrane is used as from filter paper.
The metal electrode bar use Q235 models carbon steel, a diameter of 1.0-1.5mm of the metal electrode bar, preferably
1.2mm。
The multi-channel electrode detecting head surface is parallel with the upper surface of the weld joint samples to be measured, and the multichannel
The worksheet area of electrode probe surface covering is not more than the surface area of the weld joint samples to be measured.
The present invention can be with the corrosion of online real time collecting welding point each several part in corrosive environment by electrochemical means
Electric current, obtains current distributing figure, anode region and cathodic region that galvanic corrosion occurs is judged, so that visual and clear research connects
The galvanic corrosion sensitiveness at each position is strong and weak, and simple with result, easy to operate, measurement accuracy is high, and intuitive measurement results are clear
Clear the advantages of.
A kind of Non-Destructive Testing side of online prison detection metal welding jointses position galvanic corrosion sensitiveness proposed by the present invention
Method, a kind of new method is provided for the online prison detection of welding point position galvanic corrosion sensitiveness.The method can be examined online
The corrosion current in each region in metal welding jointses surface is measured, so as to judge anode region and cathodic region, the galvanic couple in each region is obtained
Extent of corrosion and corrosion situation of change, so as to judge its galvanic corrosion sensitiveness.With traditional Non-Destructive Testing welded-joint
The method of position galvanic corrosion sensitiveness is compared, and the method can observe metal welding jointses portion faces more visual and clearly
Galvanic corrosion situation, with simple to operate, measurement accuracy is high, accuracy is high, production efficiency is high, facilitates easy-to-use, real-time high
Advantage, be particularly suitable for live metal welding jointses position galvanic corrosion sensitiveness online prison detection.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the cross-sectional view of multi-channel electrode probe in the present invention；
Fig. 3 is salt spray test chamber internal corrosion of the weld joint samples to be measured in 3.5%NaCl in the specific embodiment of the invention
The erosion profile figure obtained after 10min；
Fig. 4 is that the weld joint samples to be measured that specific embodiment of the invention Computer analyzing and processing current data is obtained are rotten
Lose the current distributing figure after 10min.
In figure：1 is weld joint samples to be measured, and 1-1 is welding point mother metal area, and 1-2 is welding point weld metal zone, and 2 are
Computer, 3 be conductive membrane, and 4 be multi-channel electrode probe, and 4-1 is phenolic resin, and 4-2 is metal bar, and 5-1 is the first electrolyte
Solution container, 5-2 is electrolyte solution container, and 6 be reference electrode, and 7 be electro-chemical measuring apparatus.
Embodiment
Technical scheme is further described below by specific embodiment.
As shown in Figures 1 to 4, in figure：1 is weld joint samples to be measured, and 1-1 is welding point mother metal area, and 1-2 connects for welding
Head weld metal zone, 2 be computer, and 3 be conductive membrane, and 4 be multi-channel electrode probe, and 4-1 is phenolic resin, and 4-2 is metal bar, 5-1
For the first electrolyte solution container, 5-2 is electrolyte solution container, and 6 be reference electrode, and 7 be electro-chemical measuring apparatus.
Embodiment 1
A kind of the cannot-harm-detection device for detecting metal welding jointses galvanic corrosion sensitiveness, including：Welding point examination to be measured
Sample, conductive membrane, electrolyte solution container, reference electrode, multi-channel electrode probe, electro-chemical measuring apparatus and computer, it is to be measured
Weld joint samples include welding point mother metal area and welding point weld metal zone, and welding point weld metal zone occupy welding point to be measured
Centre position, welding point weld metal zone surface is parallel with welding point mother metal area, and the area of multi-channel electrode probe is more than weldering
The area in joint welding area is connect, multi-channel electrode, which is popped one's head in, is arranged on the upper surface of weld joint samples to be measured, and multi-channel electrode is visited
Head is made up of phenolic resin and metal electrode bar, electrolyte solution container include two identical the first electrolyte solution containers and
Second electrolyte solution container, the first electrolyte solution container and the second electrolyte solution container are symmetrically arranged at weldering to be measured
The both sides of joint samples are connect, the bottom (test side of popping one's head in) popped one's head in multi-channel electrode and the upper table of weld joint samples to be measured
It is provided with conductive membrane between face, bottom and weld joint samples to be measured that the film surface of conductive membrane is popped one's head in multi-channel electrode respectively
Upper surface be in close contact, and the two side ends of conductive membrane infiltrate in the first electrolyte solution container and the second electrolyte solution respectively
In the electrolyte solution of container, one end of reference electrode is placed on the first electrolyte solution container by salt bridge (not marked in figure)
Electrolyte solution in, the top (i.e. Signal connector end) of multi-channel electrode probe, reference electrode, weld joint samples to be measured
The bottom surface of welding point weld metal zone passes through the signal acquisition terminal (not marked in figure) of wire and electro-chemical measuring apparatus, demarcation respectively
Reference electrode end (not marked in figure) is connected with earth terminal (not marked in figure), and electro-chemical measuring apparatus includes zero point resistance circuit,
The signal output part of electro-chemical measuring apparatus is connected with computer.
In the present embodiment, it is used as reference electrode from saturated calomel electrode.
In the present embodiment, it is respectively arranged with 3.5% in the first electrolyte solution container and the second electrolyte solution container
NaCl solution.
In the present embodiment, it is used as conductive membrane from filter paper.
In the present embodiment, the metal electrode bar material of multi-channel electrode probe is the carbon steel of Q235 models, wherein leading to more
Road electrode probe is equidistantly fixed in phenolic resin by the carbon steel rod of 25 Q235 models, is arranged into 5 rows 5, and 1.0mm is arranged at equal intervals
It is listed in phenolic resin, a diameter of 1.5mm of the carbon steel rod of Q235 models.
In the present embodiment, the signal acquisition terminal of electro-chemical measuring apparatus (is not marked including 25 signal acquisition contacts in figure
Go out).
In the present embodiment, the specific of the signal acquisition terminal of the top of multi-channel electrode probe and electro-chemical measuring apparatus connects
The mode of connecing is：Signal of 25 metal electrode bars of multi-channel electrode probe by 25 wires respectively with electro-chemical measuring apparatus
25 signal acquisition contacts connection of collection terminal.
In the present embodiment, electro-chemical measuring apparatus is controlled by the single-chip microcomputer being embedded, according to 25 metal electrode bars
Position, successively 25 signal acquisition points of acquisition order current signal.
The lossless detection method of online prison detection metal welding jointses galvanic corrosion sensitiveness is realized by step：
Step 1：According to welded seam area surface configuration and the suitable electrode probe beam of material selection and adjustment probe beam curved surface.
Test sample is the welding point of Q235 steel in the present embodiment, and welded seam area is smaller to occupy middle, and surface is parallel with mother metal.Entirely
The surface area of welding point part is 10*10mm, therefore the electrode probe beam selected is as shown in Fig. 2 probe material is used
Q235 carbon steels, the arrangement of 5*5 parallel arrays, probe diameter 1.5mm, spacing is 1.0mm.
Step 2：Suitable reference electrode and salt bridge are chosen according to electrolyte solution.Because electrolyte solution is 3.5%
NaCl, therefore reference electrode adds salt bridge from saturated calomel electrode.
Step 3：Fixed using will pop one's head in beam and reference electrode of appropriate device, wherein electrode probe beam passes through ion conductive membrane
Contacted with test sample, reference electrode is placed in electrolyte solution by salt bridge, ion conductive membrane is infiltrated in electrolyte solution
In.The corrosion potential and electric current on measurement device welding point surface as shown in Figure 1 are used in the present embodiment.Ion conductive membrane two
End infiltration is in electrolyte solution, and electrode probe beam is positioned over above welding point and connect by ion conductive membrane and test sample
Touch, reference electrode is placed in 3.5%NaCl electrolyte solutions by salt bridge, finally will probe beam and reference using fixing device
Electrode is fixed.
Step 4：Current signal, wherein electrode probe beam and electrochemical measurement are gathered using the device with zero resistance circuit
Device working end is connected, and test sample is connected with electrochemical testing device earth terminal, and reference electrode (plus salt bridge) is surveyed with electrochemistry
Try the connection of equipment and instrument reference electrode end.
Step 5：Opsition dependent constitutes galvanic couple pair to each probe with detected materials respectively, and sampling is determined according to the characteristics of material
At the moment, after sampling terminates, a probe is changed, until all probe samplings terminate.
Step 6：The current potential and current signal of collection are analyzed and processed, output current potential and current distributing figure, it is determined that examination
The anode and cathode region on sample surface simultaneously judges that the galvanic corrosion sensitiveness at each position of welding point is strong and weak.After being gathered in the present embodiment
Electric current and potential data carry out processing drawing using the self-editing difference programs of Matlab.In order to which the measurement for showing the inventive method is accurate
Degree, the specific embodiment only lists the current potential and current distributing figure after welding point position corrosion 10min.
Embodiment 2
A kind of the cannot-harm-detection device for detecting metal welding jointses galvanic corrosion sensitiveness, including：Welding point examination to be measured
Sample, conductive membrane, electrolyte solution container, reference electrode, multi-channel electrode probe, electro-chemical measuring apparatus and computer, it is to be measured
Weld joint samples include welding point mother metal area and welding point weld metal zone, and welding point weld metal zone occupy welding point to be measured
Centre position, welding point weld metal zone surface is parallel with welding point mother metal area, and the area of multi-channel electrode probe is more than weldering
The area in joint welding area is connect, multi-channel electrode, which is popped one's head in, is arranged on the upper surface of weld joint samples to be measured, and multi-channel electrode is visited
Head is made up of phenolic resin and metal electrode bar, electrolyte solution container include two identical the first electrolyte solution containers and
Second electrolyte solution container, the first electrolyte solution container and the second electrolyte solution container are symmetrically arranged at weldering to be measured
The both sides of joint samples are connect, the bottom (test side of popping one's head in) popped one's head in multi-channel electrode and the upper table of weld joint samples to be measured
It is provided with conductive membrane between face, bottom that the film surface of conductive membrane is popped one's head in multi-channel electrode respectively and weld joint samples to be measured
Upper surface is in close contact, and the two side ends of conductive membrane infiltrate in the first electrolyte solution container and the second electrolyte solution appearance respectively
In the electrolyte solution of device, one end of reference electrode is placed on the first electrolyte solution container by salt bridge (not marked in figure)
In electrolyte solution, the top (i.e. Signal connector end) of multi-channel electrode probe, reference electrode, the weldering of weld joint samples to be measured
Joined respectively by the signal acquisition terminal (not marked in figure) of wire and electro-chemical measuring apparatus, demarcation the bottom surface for meeting joint welding area
It is connected than electrode tip (not marked in figure) with earth terminal (not marked in figure), electro-chemical measuring apparatus includes zero point resistance circuit, electricity
The signal output part of chemical measurement device is connected with computer.
In the present embodiment, it is used as reference electrode from saturated calomel electrode.
In the present embodiment, it is respectively arranged with 3.5% in the first electrolyte solution container and the second electrolyte solution container
NaCl solution.
In the present embodiment, it is used as conductive membrane from filter paper.
In the present embodiment, the metal electrode bar material of multi-channel electrode probe is the carbon steel of Q235 models, wherein leading to more
Road electrode probe is equidistantly fixed in phenolic resin by the carbon steel rod of 400 Q235 models, is arranged into 20 rows 20, at equal intervals
0.1mm is arranged in phenolic resin, a diameter of 1.0mm of the carbon steel rod of Q235 models.
In the present embodiment, the signal acquisition terminal of electro-chemical measuring apparatus (is not marked including 400 signal acquisition contacts in figure
Go out).
In the present embodiment, the specific of the signal acquisition terminal of the top of multi-channel electrode probe and electro-chemical measuring apparatus connects
The mode of connecing is：Letter of 400 metal electrode bars of multi-channel electrode probe by 400 wires respectively with electro-chemical measuring apparatus
400 signal acquisition contacts connection of number collection terminal.
In the present embodiment, electro-chemical measuring apparatus is controlled by the single-chip microcomputer being embedded, according to 400 metal electrode bars
Position, successively 400 signal acquisition points of acquisition order current signal.
The lossless detection method of online prison detection metal welding jointses galvanic corrosion sensitiveness is realized by step：
Step 1：According to welded seam area surface configuration and the suitable electrode probe beam of material selection and adjustment probe beam curved surface.
Test sample is the welding point of Q235 steel in the present embodiment, and welded seam area is smaller to occupy middle, and surface is parallel with mother metal.Entirely
The surface area of welding point part is 25*25mm, therefore the electrode probe beam selected is as shown in Fig. 2 probe material is used
Q235 carbon steels, the arrangement of 20*20 parallel arrays, probe diameter 1.0mm, spacing is 0.1mm.
Step 2：Suitable reference electrode and salt bridge are chosen according to electrolyte solution.Because electrolyte solution is 3.5%
NaCl, therefore reference electrode adds salt bridge from saturated calomel electrode.
Step 3：Fixed using will pop one's head in beam and reference electrode of appropriate device, wherein electrode probe beam passes through ion conductive membrane
Contacted with test sample, reference electrode is placed in electrolyte solution by salt bridge, ion conductive membrane is infiltrated in electrolyte solution
In.The corrosion potential and electric current on measurement device welding point surface as shown in Figure 1 are used in the present embodiment.Ion conductive membrane two ends
Infiltration is in electrolyte solution, and electrode probe beam is positioned over above welding point and contacted by ion conductive membrane with test sample,
Reference electrode is placed in 3.5%NaCl electrolyte solutions by salt bridge, finally will probe beam and reference electricity using fixing device
Extremely fix.
Step 4：Current signal, wherein electrode probe beam and electrochemical measurement are gathered using the device with zero resistance circuit
Device working end is connected, and test sample is connected with electrochemical testing device earth terminal, and reference electrode (plus salt bridge) is surveyed with electrochemistry
Try the connection of equipment and instrument reference electrode end.
Step 5：Opsition dependent constitutes galvanic couple pair to each probe with detected materials respectively, and sampling is determined according to the characteristics of material
At the moment, after sampling terminates, a probe is changed, until all probe samplings terminate.
Step 6：The current potential and current signal of collection are analyzed and processed, output current potential and current distributing figure, it is determined that examination
The anode and cathode region on sample surface simultaneously judges that the galvanic corrosion sensitiveness at each position of welding point is strong and weak.After being gathered in the present embodiment
Electric current and potential data carry out processing drawing using the self-editing difference programs of Matlab.In order to which the measurement for showing the inventive method is accurate
Degree, the specific embodiment only lists the current potential and current distributing figure after welding point position corrosion 10min.
Embodiment 3
A kind of the cannot-harm-detection device for detecting metal welding jointses galvanic corrosion sensitiveness, including：Welding point examination to be measured
Sample, conductive membrane, electrolyte solution container, reference electrode, multi-channel electrode probe, electro-chemical measuring apparatus and computer, it is to be measured
Weld joint samples include welding point mother metal area and welding point weld metal zone, and welding point weld metal zone occupy welding point to be measured
Centre position, welding point weld metal zone surface is parallel with welding point mother metal area, and the area of multi-channel electrode probe is more than weldering
The area in joint welding area is connect, multi-channel electrode, which is popped one's head in, is arranged on the upper surface of weld joint samples to be measured, and multi-channel electrode is visited
Head is made up of phenolic resin and metal electrode bar, electrolyte solution container include two identical the first electrolyte solution containers and
Second electrolyte solution container, the first electrolyte solution container and the second electrolyte solution container are symmetrically arranged at weldering to be measured
The both sides of joint samples are connect, the bottom (test side of popping one's head in) popped one's head in multi-channel electrode and the upper table of weld joint samples to be measured
It is provided with conductive membrane between face, bottom that the film surface of conductive membrane is popped one's head in multi-channel electrode respectively and weld joint samples to be measured
Upper surface is in close contact, and the two side ends of conductive membrane infiltrate in the first electrolyte solution container and the second electrolyte solution appearance respectively
In the electrolyte solution of device, one end of reference electrode is placed on the first electrolyte solution container by salt bridge (not marked in figure)
In electrolyte solution, the top (i.e. Signal connector end) of multi-channel electrode probe, reference electrode, the weldering of weld joint samples to be measured
Joined respectively by the signal acquisition terminal (not marked in figure) of wire and electro-chemical measuring apparatus, demarcation the bottom surface for meeting joint welding area
It is connected than electrode tip (not marked in figure) with earth terminal (not marked in figure), electro-chemical measuring apparatus includes zero point resistance circuit, electricity
The signal output part of chemical measurement device is connected with computer.
In the present embodiment, it is used as reference electrode from saturated calomel electrode.
In the present embodiment, it is respectively arranged with 3.5% in the first electrolyte solution container and the second electrolyte solution container
NaCl solution.
In the present embodiment, it is used as conductive membrane from filter paper.
In the present embodiment, the metal electrode bar material of multi-channel electrode probe is the carbon steel of Q235 models, wherein leading to more
Road electrode probe is equidistantly fixed in phenolic resin by the carbon steel rod of 225 Q235 models, is arranged into 15 rows 15, at equal intervals
0.5mm is arranged in phenolic resin, a diameter of 1.4mm of the carbon steel rod of Q235 models.
In the present embodiment, the signal acquisition terminal of electro-chemical measuring apparatus (is not marked including 225 signal acquisition contacts in figure
Go out).
In the present embodiment, the specific of the signal acquisition terminal of the top of multi-channel electrode probe and electro-chemical measuring apparatus connects
The mode of connecing is：Letter of 225 metal electrode bars of multi-channel electrode probe by 225 wires respectively with electro-chemical measuring apparatus
225 signal acquisition contacts connection of number collection terminal.
In the present embodiment, electro-chemical measuring apparatus is controlled by the single-chip microcomputer being embedded, according to 225 metal electrode bars
Position, successively 225 signal acquisition points of acquisition order current signal.
The lossless detection method of online prison detection metal welding jointses galvanic corrosion sensitiveness is realized by step：
Step 1：According to welded seam area surface configuration and the suitable electrode probe beam of material selection and adjustment probe beam curved surface.
Test sample is the welding point of Q235 steel in the present embodiment, and welded seam area is smaller to occupy middle, and surface is parallel with mother metal.Entirely
The surface area of welding point part is 15*15mm, therefore the electrode probe beam selected is as shown in Fig. 2 probe material is used
Q235 carbon steels, the arrangement of 25*25 parallel arrays, probe diameter 1.4mm, spacing is 0.5mm.
Step 2：Suitable reference electrode and salt bridge are chosen according to electrolyte solution.Because electrolyte solution is 3.5%
NaCl, therefore reference electrode adds salt bridge from saturated calomel electrode.
Step 3：Fixed using will pop one's head in beam and reference electrode of appropriate device, wherein electrode probe beam passes through ion conductive membrane
Contacted with test sample, reference electrode is placed in electrolyte solution by salt bridge, ion conductive membrane is infiltrated in electrolyte solution
In.The corrosion potential and electric current on measurement device welding point surface as shown in Figure 1 are used in the present embodiment.Ion conductive membrane two ends
Infiltration is in electrolyte solution, and electrode probe beam is positioned over above welding point and contacted by ion conductive membrane with test sample,
Reference electrode is placed in 3.5%NaCl electrolyte solutions by salt bridge, finally will probe beam and reference electricity using fixing device
Extremely fix.
Step 4：Current signal, wherein electrode probe beam and electrochemical measurement are gathered using the device with zero resistance circuit
Device working end is connected, and test sample is connected with electrochemical testing device earth terminal, and reference electrode (plus salt bridge) is surveyed with electrochemistry
Try the connection of equipment and instrument reference electrode end.
Step 5：Opsition dependent constitutes galvanic couple pair to each probe with detected materials respectively, and sampling is determined according to the characteristics of material
At the moment, after sampling terminates, a probe is changed, until all probe samplings terminate.
Step 6：The current potential and current signal of collection are analyzed and processed, output current potential and current distributing figure, it is determined that examination
The anode and cathode region on sample surface simultaneously judges that the galvanic corrosion sensitiveness at each position of welding point is strong and weak.After being gathered in the present embodiment
Electric current and potential data carry out processing drawing using the self-editing difference programs of Matlab.In order to which the measurement for showing the inventive method is accurate
Degree, the specific embodiment only lists the current potential and current distributing figure after welding point position corrosion 10min.
Embodiment 4
A kind of the cannot-harm-detection device for detecting metal welding jointses galvanic corrosion sensitiveness, including：Welding point examination to be measured
Sample, conductive membrane, electrolyte solution container, reference electrode, multi-channel electrode probe, electro-chemical measuring apparatus and computer, it is to be measured
Weld joint samples include welding point mother metal area and welding point weld metal zone, and welding point weld metal zone occupy welding point to be measured
Centre position, welding point weld metal zone surface is parallel with welding point mother metal area, and the area of multi-channel electrode probe is more than weldering
The area in joint welding area is connect, multi-channel electrode, which is popped one's head in, is arranged on the upper surface of weld joint samples to be measured, and multi-channel electrode is visited
Head is made up of phenolic resin and metal electrode bar, electrolyte solution container include two identical the first electrolyte solution containers and
Second electrolyte solution container, the first electrolyte solution container and the second electrolyte solution container are symmetrically arranged at weldering to be measured
The both sides of joint samples are connect, the bottom (test side of popping one's head in) popped one's head in multi-channel electrode and the upper table of weld joint samples to be measured
It is provided with conductive membrane between face, bottom that the film surface of conductive membrane is popped one's head in multi-channel electrode respectively and weld joint samples to be measured
Upper surface is in close contact, and the two side ends of conductive membrane infiltrate in the first electrolyte solution container and the second electrolyte solution appearance respectively
In the electrolyte solution of device, one end of reference electrode is placed on the first electrolyte solution container by salt bridge (not marked in figure)
In electrolyte solution, the top (i.e. Signal connector end) of multi-channel electrode probe, reference electrode, the weldering of weld joint samples to be measured
Joined respectively by the signal acquisition terminal (not marked in figure) of wire and electro-chemical measuring apparatus, demarcation the bottom surface for meeting joint welding area
It is connected than electrode tip (not marked in figure) with earth terminal (not marked in figure), electro-chemical measuring apparatus includes zero point resistance circuit, electricity
The signal output part of chemical measurement device is connected with computer.
In the present embodiment, it is used as reference electrode from saturated calomel electrode.
In the present embodiment, it is respectively arranged with 3.5% in the first electrolyte solution container and the second electrolyte solution container
NaCl solution.
In the present embodiment, it is used as conductive membrane from filter paper.
In the present embodiment, the metal electrode bar material of multi-channel electrode probe is the carbon steel of Q235 models, wherein leading to more
Road electrode probe is equidistantly fixed in phenolic resin by the carbon steel rod of 100 Q235 models, is arranged into 10 rows 10, at equal intervals
0.2mm is arranged in phenolic resin, a diameter of 1.2mm of the carbon steel rod of Q235 models.
In the present embodiment, the signal acquisition terminal of electro-chemical measuring apparatus (is not marked including 100 signal acquisition contacts in figure
Go out).
In the present embodiment, the specific of the signal acquisition terminal of the top of multi-channel electrode probe and electro-chemical measuring apparatus connects
The mode of connecing is：Letter of 100 metal electrode bars of multi-channel electrode probe by 100 wires respectively with electro-chemical measuring apparatus
100 signal acquisition contacts connection of number collection terminal.
In the present embodiment, electro-chemical measuring apparatus is controlled by the single-chip microcomputer being embedded, according to 100 metal electrode bars
Position, successively 100 signal acquisition points of acquisition order current signal.
In the present embodiment, weld joint samples to be measured are the welding point of Q235 steel, and welding point weld metal zone is smaller to occupy
In centre, its surface is parallel with welding point mother metal area, and the surface area of whole welding point part is 15*15mm.
The course of work of the present invention is as follows：
In the use of the present invention, weld joint samples to be measured are contacted by the conductive membrane with being impregnated with 3.5%NaCl solution,
Its surface can corrode.During detection, the welding point weld metal zone of weld joint samples to be measured is set to be connect with electrochemical testing device
Ground terminal is turned on, and the demarcation reference electrode end of reference electrode and electro-chemical measuring apparatus is turned on；Pass through electro-chemical measuring apparatus
Embedded single-chip microcomputer control, electro-chemical measuring apparatus gathers current signal successively, and the current signal of collection is defeated by and electrification
Learn the connected computer of measurement apparatus；Computer is analyzed and processed to the current signal of collection, output current distribution map.In electricity
In flow point Butut, each electrode all correspond to a two-dimensional coordinate, and such as first electrode correspond to coordinate (1,1), second
Electrode respective coordinates (1,2), until the tenth electrode respective coordinates (1,10).But abscissa enters since the tenth electrode
Row changes, and correspond to coordinate (2,1), similarly up to the 20th electrode respective coordinates (2,10), and then abscissa changes again.
I.e. every ten electrodes, abscissa changes once, until the 100th electrode pair answers (10,10).Can be with according to current distributing figure
Determine the anode and cathode region on weld joint samples surface and judge that the galvanic corrosion sensitiveness at each position of welding point is strong and weak.
In the present embodiment, weld joint samples to be measured are corroded after 10min in the present invention, gather its current signal, and
Send the current signal of collection to computer, the weld joint samples to be measured corrosion that computer analyzing and processing current data is obtained
As shown in Figure 4, it is welding point examination to be measured that electric current large area is can see from accompanying drawing 4 to current distributing figure after 10min
As anode preferential corrosion can occur for the welding point mother metal area of sample both sides, these regions；Current value smaller area is weldering to be measured
The welding point weld metal zone in the middle of joint samples is connect, these regions are not corroded as negative electrode.This and welding to be measured in accompanying drawing 3
The erosion profile figure result that joint samples are obtained after 3.5%NaCl salt spray test chamber internal corrosion 10min is consistent, i.e., weldering to be measured
The welding point mother metal area and welding point weld metal zone for connecing joint samples form galvanic corrosion, and welding point mother metal area is used as sun
Pole is corroded, and welding point weld metal zone is not corroded as negative electrode by protection.In figure 4, maximum galvanic corrosion
Current value is in 2 μ A/cm2To 3 μ A/cm2Between, judge that galvanic couple is rotten according to foundation Galvanic Current size in navigation mark HB 5374-1987
The corrosion class of erosion sensitivity, weld seam and mother metal galvanic couple pair belongs to C grades.
The lossless detection method of online prison detection metal welding jointses galvanic corrosion sensitiveness is realized by step：
Step 1：According to welded seam area surface configuration and the suitable electrode probe beam of material selection and adjustment probe beam curved surface.
Test sample is the welding point of Q235 steel in the present embodiment, and welded seam area is smaller to occupy middle, and surface is parallel with mother metal.Entirely
The surface area of welding point part is 15*15mm, therefore the electrode probe beam selected is as shown in Fig. 2 probe material is used
Q235 carbon steels, the arrangement of 10*10 parallel arrays, probe diameter 1.2mm, spacing is 0.2mm.
Step 2：Suitable reference electrode and salt bridge are chosen according to electrolyte solution.Because electrolyte solution is 3.5%
NaCl, therefore reference electrode adds salt bridge from saturated calomel electrode.
Step 3：Fixed using will pop one's head in beam and reference electrode of appropriate device, wherein electrode probe beam passes through ion conductive membrane
Contacted with test sample, reference electrode is placed in electrolyte solution by salt bridge, ion conductive membrane is infiltrated in electrolyte solution
In.The corrosion potential and electric current on measurement device welding point surface as shown in Figure 1 are used in the present embodiment.Ion conductive membrane two ends
Infiltration is in electrolyte solution, and electrode probe beam is positioned over above welding point and contacted by ion conductive membrane with test sample,
Reference electrode is placed in 3.5%NaCl electrolyte solutions by salt bridge, finally will probe beam and reference electricity using fixing device
Extremely fix.
Step 4：Current signal, wherein electrode probe beam and electrochemical measurement are gathered using the device with zero resistance circuit
Device working end is connected, and test sample is connected with electrochemical testing device earth terminal, and reference electrode (plus salt bridge) is surveyed with electrochemistry
Try the connection of equipment and instrument reference electrode end.
Step 5：Opsition dependent constitutes galvanic couple pair to each probe with detected materials respectively, and sampling is determined according to the characteristics of material
At the moment, after sampling terminates, a probe is changed, until all probe samplings terminate.
Step 6：The current potential and current signal of collection are analyzed and processed, output current potential and current distributing figure, it is determined that examination
The anode and cathode region on sample surface simultaneously judges that the galvanic corrosion sensitiveness at each position of welding point is strong and weak.After being gathered in the present embodiment
Electric current and potential data carry out processing drawing using the self-editing difference programs of Matlab.In order to which the measurement for showing the inventive method is accurate
Degree, the specific embodiment only lists the current potential and current distributing figure after welding point position corrosion 10min.
Analyzed and processed referring to Fig. 4 specific embodiment of the invention Computer after the corrosion 10min that corrosion current data are obtained
Current distributing figure, it can be seen that electric current large area is both sides mother metal, correspondence current potential smaller area simultaneously correspondence erosion profile figure
In corrosion area, as anode preferential corrosion can occur for these regions；Current value smaller area is intermediate weld area, correspondence electricity
Non- corrosion area in position large area and correspondence erosion profile figure, these regions are not corroded as negative electrode.As a result show
The galvanic corrosion of mother metal and weld seam can occur in 3.5%NaCl electrolyte solutions for the welding point position, and mother metal is used as anode
Corrode, and weld seam is protected as negative electrode, this is consistent with Fig. 3 erosion profile figure results.It is distributed referring to Fig. 4 corrosion currents
Figure, maximum galvanic corrosion current value is in 2 μ A/cm2To 3 μ A/cm2Between, according to by electric according to galvanic couple in navigation mark HB5374-1987
Stream size judges galvanic corrosion sensitivity, and the corrosion class of weld seam and mother metal galvanic couple pair belongs to C grades.Referring to Fig. 4 it can be seen that red
The deeper zonal corrosion current value of color is bigger, i.e. galvanic corrosion sensitiveness is stronger.
In summary, the method in the embodiment of the present invention can with online real time collecting welding point in corrosive environment each portion
The corrosion current divided, obtains current distributing figure, anode region and cathodic region that galvanic corrosion occurs is judged, so that visual and clear
The galvanic corrosion sensitiveness for studying each position of welding point is strong and weak.This detects the electricity at metal welding jointses position for online prison in real time
Thermogalvanic corrision sensitiveness provides a kind of important method, and simple to operate, measurement accuracy is high, with important practical significance.
Exemplary description is done to the present invention above, it should explanation, in the situation for the core for not departing from the present invention
Under, any simple deformation, modification or other skilled in the art can not spend the equivalent substitution of creative work equal
Fall into protection scope of the present invention.
Claims (6)
1. the cannot-harm-detection device of online prison detection metal welding jointses position galvanic corrosion sensitiveness, it is characterised in that：Including
Weld joint samples to be measured, conductive membrane, electrolyte solution container, reference electrode, multi-channel electrode probe, electro-chemical measuring apparatus
And computer, the weld joint samples to be measured include welding point mother metal area and welding point weld metal zone, the welding point
Weld metal zone occupy the centre position of the welding point to be measured, welding point weld metal zone surface and the welding point mother metal
Area is parallel, and the area of the multi-channel electrode probe is more than the area of the welding point weld metal zone, and the multi-channel electrode is visited
Head is arranged on the upper surface of the weld joint samples to be measured, and the multi-channel electrode probe is by phenolic resin and metal electrode bar
Composition, the metal electrode bar is distributed in the phenolic resin in M rows N row are equidistant, and the M is less than or equal to more than or equal to 5
20, the N are more than or equal to 5 and are less than or equal to 20, and the electrolyte solution container includes two electrolyte solutions of identical first and held
Device and the second electrolyte solution container, the first electrolyte solution container and the second electrolyte solution container are respectively symmetrically
The both sides of the weld joint samples to be measured are arranged on, the bottom popped one's head in the multi-channel electrode is probe test side and described
Be provided with the conductive membrane between the upper surface of weld joint samples to be measured, the film surface of the conductive membrane respectively with the multichannel
The bottom of electrode probe and the upper surface of the weld joint samples to be measured are in close contact, and the two side ends difference of the conductive membrane
Infiltration is in the electrolyte solution of the first electrolyte solution container and the second electrolyte solution container, the reference electricity
One end of pole is placed on by salt bridge in the electrolyte solution of the second electrolyte solution container, the multi-channel electrode probe
Top be the bottom surface of Signal connector end, the reference electrode, the welding point weld metal zone respectively by wire and the electricity
The signal acquisition terminal of chemical measurement device, demarcation reference electrode end are connected with earth terminal, and the electro-chemical measuring apparatus includes zero
Resistance circuit, the signal output part of the electro-chemical measuring apparatus is connected with the computer.
2. the Non-Destructive Testing dress of online prison detection metal welding jointses position galvanic corrosion sensitiveness according to claim 1
Put, it is characterised in that：From saturated calomel electrode as reference electrode, the first electrolyte solution container and described second
3.5%NaCl solution is respectively arranged with electrolyte solution container.
3. the Non-Destructive Testing dress of online prison detection metal welding jointses position galvanic corrosion sensitiveness according to claim 1
Put, it is characterised in that：Conductive membrane is the filter paper for being soaked with 3.5%NaCl solution.
4. the Non-Destructive Testing dress of online prison detection metal welding jointses position galvanic corrosion sensitiveness according to claim 1
Put, it is characterised in that：The metal electrode bar uses the carbon steel of Q235 models, a diameter of 1.0- of the metal electrode bar
1.5mm。
5. the Non-Destructive Testing dress of online prison detection metal welding jointses position galvanic corrosion sensitiveness according to claim 1
Put, it is characterised in that：A diameter of 1.2mm of the metal electrode bar.
6. the Non-Destructive Testing dress of online prison detection metal welding jointses position galvanic corrosion sensitiveness according to claim 1
Put, it is characterised in that：The top of the multi-channel electrode probe and the specific connection of the signal acquisition terminal of electro-chemical measuring apparatus
Mode is：The metal electrode bar is adopted by wire and each signal of the signal acquisition terminal of the electro-chemical measuring apparatus respectively
Tie point is connected.
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| CN201710682386.2A CN107576709A (en) | 2015-02-25 | 2015-02-25 | Metal welding jointses position galvanic corrosion sensitive detection method based on the cannot-harm-detection device |
| CN201510087246.1A CN105319158B (en) | 2015-02-25 | 2015-02-25 | The cannot-harm-detection device and method of online prison detection metal welding jointses position galvanic corrosion sensitiveness |
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| CN108680493B (en) * | 2016-04-29 | 2020-07-17 | 天津大学 | Method for measuring corrosion current density in galvanic corrosion of metal welding joint part |
| CN109781616A (en) * | 2017-11-13 | 2019-05-21 | 广西大学 | It is a kind of for detecting the experimental rig corroded in molten salt reactor and detection method |
| CN108562535B (en) * | 2018-03-23 | 2023-10-27 | 天津大学 | Corrosion electrochemical nondestructive detection device and detection method for detecting metal surface defects |
| 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 |
| CN112930474A (en) * | 2019-01-18 | 2021-06-08 | 波音公司 | System and method for measuring galvanic corrosion potential |
| CN109900630A (en) * | 2019-01-31 | 2019-06-18 | 中国科学院金属研究所 | It is a kind of to evaluate complicated metal pair to the test device and method of galvanic corrosion |
| CN110823690A (en) * | 2019-11-05 | 2020-02-21 | 南京钢铁股份有限公司 | Method for rapidly evaluating atmospheric environmental stress corrosion sensitivity of low-alloy structural steel |
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