CN109030337A - A kind of buried metal pipeline corrosion and corrosion protection layer peel test system based on SECM - Google Patents
A kind of buried metal pipeline corrosion and corrosion protection layer peel test system based on SECM Download PDFInfo
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- CN109030337A CN109030337A CN201810717409.3A CN201810717409A CN109030337A CN 109030337 A CN109030337 A CN 109030337A CN 201810717409 A CN201810717409 A CN 201810717409A CN 109030337 A CN109030337 A CN 109030337A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01Q—SCANNING-PROBE TECHNIQUES OR APPARATUS; APPLICATIONS OF SCANNING-PROBE TECHNIQUES, e.g. SCANNING PROBE MICROSCOPY [SPM]
- G01Q60/00—Particular types of SPM [Scanning Probe Microscopy] or microscopes; Essential components thereof
- G01Q60/60—SECM [Scanning Electro-Chemical Microscopy] or apparatus therefor, e.g. SECM probes
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Abstract
The buried metal pipeline corrosion and corrosion protection layer peel test system based on SECM that the invention discloses a kind of, including alternative stray current loading system, cell system and scan-type electrochemical microscope test macro；Alternative stray current loading system is for providing interference source of the buried metal pipeline by alternative stray current, cell system is for simulating the Practical Project situation that buried metal pipeline corrodes under different soils environment, scan-type electrochemical microscope test macro is used to obtain the localization microcell image and charge transfer characteristics under stray electrical current effect at the erosion resistant coating breaking point in Process of Metallic Corrosion, and carries out the analysis of data.Under test macro analog different soils environment of the invention, stray electrical current intensity, erosion resistant coating type, erosion resistant coating breakage area ratio, because of pipeline local corrosion and anticorrosive coating peeling caused by stray electrical current inflow/outflow buried metal pipeline erosion resistant coating breaking point.
Description
Technical field
The present invention relates to buried metal pipeline corrosion and corrosion protection layer peel test technical fields more particularly to one kind to be based on
The buried metal pipeline corrosion and corrosion protection layer peel test system of SECM.
Background technique
Outer anticorrosive coating technology is to reduce buried metal pipeline burn into increase having very much for buried metal pipeline service life
The method of effect.Ideal erosion resistant coating is that do not have defective, has the function of stopping to corrosive medium and shielding.However, due to applying
The factors such as the complexity of coating process and the mechanical collision in work progress, so that the erosion resistant coating on pipeline inevitably results from
Some pin holes, it is damaged the defects of, or due to during long-term military service in soil various corrosion factors long term, lead
Cause the defects of generating bonding failure and then the breakage and removing of anti-corrosion layer surface occurs.Stray electrical current, which refers to, to be designed or is providing back
The electric current flowed other than road, to become one of the important factor in order of buried metal pipeline corrosion leakage.Due to electric railway
It produces serious influence, especially has over long distances anti-to the safe operation of pipeline with the stray electrical current of the generations such as high voltage transmission line
Rotten coating damage, peeling defect oil pipeline, serious local corrosion and anticorrosive coating peeling are formed at deficiency of protection coating
Phenomenon, to seriously threaten the safe operation of pipeline.
Traditional metal erosion mechanism study generally uses the electrochemical test method of macroscopic view, such as method of polarization curve, exchange
Impedance spectral technology, corrosion potential and noise technique etc., what these traditional electrochemical test methods obtained is the macro of entire sample
Result of variations is seen, not can reflect the local corrosion information of sample.Especially for the buried metal pipeline containing erosion resistant coating, when
When corrosion phenomenon is occurred at erosion resistant coating breaking point, the electrochemical test method of traditional macro can not detect metallic matrix/molten
The Electrochemistry Information at liquid interface, and then can not reflect that the local corrosion of metal and the process of anticorrosive coating peeling and part are special
Sign.In recent years, people are exploring always the electrochemical process research in local corrosion, and microcell Scanning probe technique being capable of area
The electrochemical characteristic for dividing material different zones, provides a new approach for the research of local surfaces technology, in metal erosion
Field, which achieves, to be widely applied.Scan-type electrochemical microscope system (SECM) technology is widely used to corrosion research field,
SECM is the powerful for studying microcell electrochemical process, and the maximum feature of SECM is can be in solution system to research system
Real-time, scene, three-dimensional space observation are carried out, there is unique chemosensitivity.When SECM microprobe is very close to basal electrode
When surface scan, the redox current for scanning microprobe has the characteristic of feedback, is formed on basal electrode different location
Faradic currents image can directly characterize basal electrode surface topography and electro-chemical activity distribution, can also pass through feedback electricity
Signal describes the surface topography of substrate, studies the complex process of local corrosion, and this method compensates for macroscopical electrochemical measurement gold
Belong to the deficiency of local corrosion property.
Summary of the invention
Aiming at the shortcomings existing in the above problems, the present invention provides a kind of buried metal pipeline corrosion based on SECM
With anticorrosive coating peeling test macro.
To achieve the above object, the present invention provides a kind of buried metal pipeline corrosion and corrosion protection layer removing survey based on SECM
Test system, comprising:
Alternative stray current loading system, for providing interference source of the buried metal pipeline by alternative stray current；
Cell system, the Practical Project situation corroded under different soils environment for simulating buried metal pipeline；
Scan-type electrochemical microscope test macro, for obtaining, metal is rotten at erosion resistant coating breaking point under stray electrical current effect
Localization microcell image and charge transfer characteristics during erosion, and carry out the analysis of data.
As a further improvement of the present invention, the alternative stray current loading system includes: auxiliary platinum plate electrode, anti-corrosion
The damaged sample of layer, Simulated Soil Solution and alternating message source, the auxiliary platinum plate electrode and erosion resistant coating breakage sample are in institute
It states in Simulated Soil Solution；
Described alternating message source one end is connected with the auxiliary platinum plate electrode, the other end and the erosion resistant coating breakage sample phase
Even, stray electrical current circuit is constituted.
As a further improvement of the present invention, it connects on the conducting wire between the alternating message source and erosion resistant coating breakage sample
There are ammeter and switch.
As a further improvement of the present invention, the alternative stray current loading system further include: timer interrupter；
The timer interrupter is connected in parallel on the alternating message source, for controlling the time of alternating current load.
As a further improvement of the present invention, the cell system includes: for holding the Simulated Soil Solution
Container and clamping device for clamping the erosion resistant coating breakage sample, the clamping device installation is on the container.
As a further improvement of the present invention, the container includes: shell, bottom plate, bolt and pedestal；
The shell is fixedly connected by sealant with the bottom plate, and there are four symmetrical spiral shells for the outer ring processing of the bottom plate
Pit is put into four groups of bolts in the threaded hole, and the bottom of every group of bolt is connected by screw thread with the pedestal, passes through adjusting institute
It states bolt and realizes that the erosion resistant coating breakage sample is in horizontality.
As a further improvement of the present invention, the clamping device includes: epoxy packages resin set, sealing O circle, upper screw thread
End cap, external screw thread reducing joint, rubber sheet gasket and lower hex nut；
In epoxy packages resin set, the epoxy packages resin set is nested into the erosion resistant coating breakage specimen enclosure
In the sealing O circle；Sealing O circle upper surface is in contact with the inner surface of the upper thread ending cover, lower surface and it is described outside
The major diameter groove of screw thread reducing joint is in contact；When screwing the thread ending cover and external screw thread reducing joint, the epoxy envelope
Dress resin set is combined closely with sealing O circle；External screw thread reducing joint lower end is convexly equipped with outer-hexagonal end face, and the external screw thread is different
The miner diameter end of drive connector is inserted into the bottom plate, and the bottom plate lower end surface is in contact with the rubber sheet gasket, described by turning
Lower hex nut realizes the close contact of the external screw thread reducing joint and bottom plate.
As a further improvement of the present invention, the scan-type electrochemical microscope test macro includes: scanning probe, reference
Electrode, auxiliary platinum plate electrode, erosion resistant coating breakage sample, SECM electrochemical workstation, PC machine, probe fixing frame, electric machine controller
And three-dimensional mobile platform；
The SECM electrochemical workstation is connected with the PC machine, and the SECM electrochemical workstation uses four electrode bodies
System, the WE1 electrode of the SECM electrochemical workstation is connected with the scanning probe, WE electrode and the erosion resistant coating breakage sample
It is connected, RE electrode is connected with the reference electrode, CE electrode is connected with the auxiliary platinum plate electrode；
The scanning probe is connected by the probe fixing frame with the three-dimensional mobile platform, the three-dimensional mobile platform
For realizing the three-dimensional motion of the scanning probe；Three stepper motors of the three-dimensional mobile platform with the motor control
Device is connected, and the electric machine controller is connected with PC machine.
As a further improvement of the present invention, three guide rail slide units of the three-dimensional mobile platform are sat along X, Y, Z-space
The distribution of mark system, Y-direction guide rail slide unit are bolted on the upper plate of X-direction guide rail slide unit, and Z-direction guide rail slide unit passes through
On the fixed upper plate of guide rail slide unit in the Y direction of triangle support frame, the scanning probe is fixed on the side Z by probe fixing bracket
On the upper plate of direction guiding rail slide unit；
The structure of three guide rail slide units is identical, and Y-direction guide rail slide unit includes motor, motor support base, shaft coupling, lead screw support
Seat, lead screw, upper plate, ball-screw nut, ball-screw nut seat, baffle, backing plate, guide rail slide block and lower plate；The electricity
Machine is fixed by screws on the motor support base, and the motor support base is fixed on the right end of the lower plate, and the baffle is solid
It is scheduled on the left end of the lower plate, is symmetrically fixed on the lower plate before and after the guide rail slide block；The motor passes through connection
Axis device is connected with the lead screw；The lead screw support base is located at the left side of shaft coupling and is fixed by screws in the lower plate
On；For the ball-screw nut cover for seat on the ball-screw nut, the ball-screw nut seat and the upper plate are logical
Screw is crossed to fix；The upper surface of the backing plate is connected with the lower surface of the upper plate, lower surface and the four of the guide rail slide block
The upper surface of a sliding block is connected.
Compared with prior art, the invention has the benefit that
Test macro analog buried pipeline different soils environment of the invention, stray electrical current intensity, erosion resistant coating type, no
With under erosion resistant coating breakage area ratio, because of metal local corrosion caused by stray electrical current inflow/outflow erosion resistant coating breaking point and anti-
Rotten layer peel test；The test system structure is simple, and test method is easy, and test result is reproducible, can effectively provide
Local microcell image and charge transfer characteristics in tube metal corrosion and corrosion protection layer stripping process, to corrosion of metal process into
Capable real-time, scene and spatial observation, suitable for carrying out the laboratory research of buried metal pipeline corrosion and corrosion protection layer peel test.
Detailed description of the invention
Fig. 1 is the buried metal pipeline corrosion and corrosion protection layer peel test based on SECM disclosed in an embodiment of the present invention
The structure chart of system；
Fig. 2 is the trimetric drawing of three-dimensional mobile platform disclosed in an embodiment of the present invention；
Fig. 3 is the sectional view that epoxy packages resin encapsulation disclosed in an embodiment of the present invention fills erosion resistant coating breakage sample；
Fig. 4 is the sectional view of clamping device disclosed in an embodiment of the present invention；
Fig. 5 is the X80 steel curved beam of the coating epoxy coating carried out using the present invention in 50A/m2SECM line under AC influence
Sweep test result figure；
Fig. 6 a is the X80 steel curved beam of the coating epoxy coating carried out using the present invention in 50A/m20h is impregnated under AC influence
SECM Surface scan test result figure；
Fig. 6 b is the X80 steel curved beam of the coating epoxy coating carried out using the present invention in 50A/m25h is impregnated under AC influence
SECM Surface scan test result figure；
Fig. 6 c is the X80 steel curved beam of the coating epoxy coating carried out using the present invention in 50A/m2It is impregnated under AC influence
The SECM Surface scan test result figure of 10h；
Fig. 6 d is the X80 steel curved beam of the coating epoxy coating carried out using the present invention in 50A/m2It is impregnated under AC influence
SECM Surface scan test result figure for 24 hours.
In figure:
I, alternative stray current loading system；II, cell system；III, scan-type electrochemical microscope test macro；
1, probe is scanned；2, reference electrode；3, platinum plate electrode is assisted；4, erosion resistant coating breakage sample；5, Simulated Soil Solution；
6, alternating message source；7, timer interrupter；8, SECM electrochemical workstation；9, PC machine；10, conducting wire；11, shell；12, bottom plate；
13, bolt；14, pedestal；15, epoxy packages resin set；16, sealing O circle；17, upper thread ending cover；18, external screw thread reducing joint；
19, rubber sheet gasket；20, lower hex nut；21, motor；22, motor support base；23, shaft coupling；24, lead screw support base；25, silk
Thick stick；26, upper plate；27, ball-screw nut；28, ball-screw nut seat；29, probe fixing frame；30, baffle；31, triangle
Shape support frame；32, backing plate；33, guide rail slide block；34, lower plate；35, electric machine controller；36, three-dimensional mobile platform.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The present invention is described in further detail with reference to the accompanying drawing:
As shown in Figs 1-4, the present invention provides a kind of buried metal pipeline corrosion and corrosion protection layer peel test based on SECM
System, comprising: alternative stray current loading system I, cell system II and scan-type electrochemical microscope test macro III；Its
In, alternative stray current loading system I is for providing interference source of the buried metal pipeline by alternative stray current, electrolytic cell system
System II is surveyed for simulating the Practical Project situation that buried metal pipeline corrodes under different soils environment, scan-type electrochemical microscope
Test system III is used to obtain the localization microcell image under stray electrical current effect at the erosion resistant coating breaking point in Process of Metallic Corrosion
And charge transfer characteristics, and carry out the analysis of data.It is specific:
Alternative stray current loading system I of the invention includes: auxiliary platinum plate electrode 3, erosion resistant coating breakage sample 4, soil
Simulated solution 5, alternating message source 6, timer interrupter 7, ammeter A1 and switch K1 assist platinum plate electrode 3 and erosion resistant coating damaged
Sample 4 is in Simulated Soil Solution 5.6 one end of alternating message source is connected with auxiliary platinum plate electrode 3, the other end and ammeter
It is connected after A1 and switch K1 series connection with erosion resistant coating breakage sample 4, constitutes stray electrical current circuit.Timer interrupter 7 is connected in parallel on exchange
In signal source 6, for controlling the time of alternating current load, experimental precision is improved；Experiment various pieces are connected using conducting wire 10.
Cell system II of the invention includes: container for holding Simulated Soil Solution 5 and for clamping erosion resistant coating
The clamping device of damaged sample 4, clamping device are mounted on container.Container includes shell 11, bottom plate 12, bolt 13 and pedestal
14, clamping device includes epoxy packages resin set 15, sealing O circle 16, upper thread ending cover 17, external screw thread reducing joint 18, rubber
Gasket 19 and lower hex nut 20.Wherein: shell 11 is fixedly connected by sealant with bottom plate 12, and the outer ring of bottom plate 12 is machined with
Four symmetrical threaded holes are put into four groups of bolts 13 in threaded hole, and the bottom of every group of bolt 13 is connected by screw thread with pedestal 14,
Realize that erosion resistant coating breakage sample 4 is in horizontality by adjusting bolt 13.Erosion resistant coating breakage sample 4 is encapsulated in epoxy packages tree
In rouge set 15, epoxy packages resin set 15 is nested into sealing O circle 16；16 upper surfaces of circle sealing O are interior with upper thread ending cover 17
Surface is in contact, and lower surface is in contact with the major diameter groove of external screw thread reducing joint 18；When screw thread end cap 17 and external screw thread
When reducing joint 18, epoxy packages resin set 15 and sealing O circle 16 is combined closely, with liquid-leakage preventing；Under external screw thread reducing joint 18
End is convexly equipped with outer-hexagonal end face, and the miner diameter end of external screw thread reducing joint 18 is inserted into bottom plate 12, and the two is clearance fit；Bottom plate 12
Lower end surface is in contact with rubber sheet gasket 19, realizes the tight of external screw thread reducing joint 18 and bottom plate 12 by turning lower hex nut 20
Contiguity touching, to prevent leak-stopping liquid.
Scan-type electrochemical microscope test macro III of the invention includes: scanning probe 1, reference electrode 2, auxiliary platinized platinum
Electrode 3, erosion resistant coating breakage sample 4, SECM electrochemical workstation 8, PC machine 9, probe fixing frame 29, electric machine controller 35 and three-dimensional
Mobile platform 36, three-dimensional mobile platform 36 are high-precision three-dimensional mobile platform；Wherein: SECM electrochemical workstation 8 and 9 phase of PC machine
Even, SECM electrochemical workstation 8 uses four electrode systems, the WE1 electrode of SECM electrochemical workstation 8 with scan probe 1 be connected,
WE electrode is connected with erosion resistant coating breakage sample 4, RE electrode is connected with reference electrode 2, CE electrode is connected with auxiliary platinum plate electrode 3；
Scanning probe 1 is connected by probe fixing frame 29 with three-dimensional mobile platform 36, and three-dimensional mobile platform 36 is for realizing scanning probe 1
Three-dimensional motion；Three stepper motors 21 of three-dimensional mobile platform 36 are connected with electric machine controller 35, electric machine controller 35 with
PC machine 9 is connected.
Three guide rail slide units of three-dimensional mobile platform 36 of the invention are distributed along X, Y, Z-space coordinate system, three guide rails
The structure of slide unit is identical, guide rail slide unit include motor 21, motor support base 22, shaft coupling 23, lead screw support base 24, lead screw 25,
Upper plate 26, ball-screw nut 27, ball-screw nut seat 28, baffle 30, backing plate 32, guide rail slide block 33 and lower plate 34；Y
Traversing guide slide unit is bolted on the upper plate 26 of X-direction guide rail slide unit, and Z-direction guide rail slide unit passes through triangle branch
On the fixed upper plate 26 of guide rail slide unit in the Y direction of support 31, scanning probe 1 is fixed on Z-direction by probe fixing bracket 29 and leads
On the upper plate 26 of rail slide unit.The structure of guide rail slide unit is illustrated by taking Y-direction guide rail slide unit as an example:
Motor 21 is fixed by screws on motor support base 22, and motor support base 22 is fixed on the right end of lower plate 34, baffle
32 are fixed on the left end of lower plate 34, and 33 front and back of guide rail slide block is symmetrically fixed on lower plate 34；Motor 21 passes through shaft coupling
23 are connected with lead screw 25；Lead screw support base 24 is located at the left side of shaft coupling 23 and is fixed by screws on lower plate 34；Ball
28 sets of feed screw nut seat on ball-screw nut 27, are interference fitted therebetween；Ball-screw nut seat 28 and upper plate 26
It is fixed by screw；The upper surface of backing plate 32 is connected with the lower surface of upper plate 26, four cunnings of lower surface and guide rail slide block 33
The upper surface of block is connected.
The present invention provides a kind of test side of buried metal pipeline corrosion and corrosion protection layer peel test system based on SECM
Method follows the steps below different soils environment, stray electrical current intensity, erosion resistant coating type, different erosion resistant coating breakage area ratios
Under, because of metal local corrosion caused by stray electrical current inflow/outflow erosion resistant coating breaking point and anticorrosive coating peeling experiment；Specific packet
It includes:
Step 1: experimental material uses X80 pipe line steel, specimen size is 10mm × 10mm × 2mm.Sample one side spot welding is drawn
Conducting wire out, and 15 are covered by specimen enclosure with epoxy packages resin.The working face of sample successively uses 400,600, No. 800 waterproof abrasive papers to beat
It is milled to mirror surface, is then cleaned with deionized water, acetone, after cold wind drying, drying for standby.Erosion resistant coating selects organic resin epoxy,
Epoxy resin E51 and polyetheramine the D230 ratio of 3:1 in mass ratio are sufficiently mixed and used, it is equal with spreading rod after static half an hour
The even X80 steel curved beam surface being coated in handle well, it is to be coated be fully cured after with pocket knife on the center of X80 steel curved beam is
5mm × 0.5mm coating damage defect is made, constitutes and has erosion resistant coating breakage sample 4, finally, packaged sample holder is arrived
In cell system.
Step 2: should be leveled to electrolytic cell substrate, before doing SECM scanning because of the distance between probe and substrate pair
The electric current that probe is detected has a major impact, this experiment is leveled using level meter, by level meter be placed on sample just on
Fang Jinhang leveling, according to the position of bubble in level meter come four screws of regulating electrolytic tank lower part, until the position of bubble exists
Level with center when, illustrate that X80 steel curved beam has leveled.
Step 3: opening alternating message source 6, timer interrupter 7, closure switch K1, the X80 steel of coating epoxy coating is tried
Sample applies alternative stray current interference, and alternating current density is 50A/m2, frequency 50Hz, respectively in 0h, 5h, 10h, for 24 hours use
SECM feedback model is scanned experiment.
Step 4: SECM electrochemical workstation 8, electric machine controller 35, PC machine 9 are opened, in the control interface of PC machine, setting
Electric machine controller makes three-dimensional mobile platform first return to initial point, adjusts the position of scanning probe 1 later, and scanning probe is placed in
The center of X80 steel curved beam coating damage point, the position of general 1mm in the surface of test coupon or so is along space coordinates Z axis
Positive direction, the scanning mode that SECM is arranged are set as two kinds, and one is Surface scan, scanning range is 1000 μm of 1000 μ m.It is another
Kind is the line scanning along space coordinates X-direction, and scanning range is 1000um, and scanning speed is 10 μm/s, probe current potential
It is set as 0V.After parameter setting, the experiment of SECM scan-type electrochemical microscope is carried out.
Step 5: scanning chief inspector is lifted along Z-direction, removes scanning probe later, gently wiping is visited after experiment
The moisture of wire surface is put into probe box and saves.All power supplys are finally disconnected, the Simulated Soil Solution in electrolytic cell is exported, takes
Lower sample, corrosion and removing pattern using Stereo microscope observation X80 steel curved beam.
Fig. 5 is the X80 steel curved beam of the coating epoxy coating carried out using the present invention in 50A/m2SECM line under AC influence
Sweep test result；The current value of SECM probe in detecting can be expressed by formula (1).
I=4nFDCa (1)
In formula:
F --- Faraday constant；
The concentration of C --- KI；
The diffusion coefficient of D --- KI；
The diameter of a --- probe；
N --- electrode reaction electron number；
When the spuious density of application increases, corrosion reaction aggravation occurs for coating damage fault location X80 steel, rotten by X80 steel
Erosion release electron number n increase, cause SECM probe in detecting to electric current i become larger, with alternative stray current action time
Extend, the width of defect broadens at the sample current peak that probe scans after impregnating for 24 hours, the boundary of substrate and coating
Become unobvious, the coating of surface fault location at this time is removed, and has produced removing at holiday at this time.
Fig. 6 a, Fig. 6 b, Fig. 6 c, Fig. 6 d are respectively that the X80 steel curved beam of the coating epoxy coating carried out using the present invention exists
50A/m20h, 5h, 10h, SECM Surface scan test result figure for 24 hours are impregnated under AC influence；By Fig. 6 a it is found that holiday
Width is 500 μm, and the peak point current of fault location is -5.92 × 10-11A.By Fig. 6 b it is found that applying 50A/m2It is soaked under AC influence
After steeping 5h, fault location width increases to 700 μm, and peak point current rises to -1.51 × 10-10A.After impregnating 10h, defect width
It obviously broadens, for width up to 1000 μm, current peak does not have significant change.Fault location width rapidly increases to 1800 μ after impregnating for 24 hours
M, peak point current are obviously got higher, and are -3.85 × 10-10A.The corrosion and coating stripping for illustrating coating damage fault location X80 steel add
It is acute.
These are only the preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of buried metal pipeline corrosion and corrosion protection layer peel test system based on SECM characterized by comprising
Alternative stray current loading system, for providing interference source of the buried metal pipeline by alternative stray current；
Cell system, the Practical Project situation corroded under different soils environment for simulating buried metal pipeline；
Scan-type electrochemical microscope test macro, for obtaining the metal erosion at erosion resistant coating breaking point under stray electrical current effect
Localization microcell image and charge transfer characteristics in journey, and carry out the analysis of data.
2. the buried metal pipeline corrosion and corrosion protection layer peel test system based on SECM as described in claim 1, feature
It is, the alternative stray current loading system includes: auxiliary platinum plate electrode (3), erosion resistant coating breakage sample (4), Simulated Soil
Solution (5) and alternating message source (6), the auxiliary platinum plate electrode (3) and erosion resistant coating breakage sample (4) are in the soil mould
In quasi- solution (5)；
Described alternating message source (6) one end is connected with the auxiliary platinum plate electrode (3), the other end and the erosion resistant coating breakage sample
(4) it is connected, constitutes stray electrical current circuit.
3. the buried metal pipeline corrosion and corrosion protection layer peel test system based on SECM as claimed in claim 2, feature
It is, is in series with ammeter and switch on the conducting wire (10) between the alternating message source (6) and erosion resistant coating breakage sample (4).
4. the buried metal pipeline corrosion and corrosion protection layer peel test system based on SECM as claimed in claim 2, feature
It is, the alternative stray current loading system further include: timer interrupter (7)；
The timer interrupter (7) is connected in parallel on the alternating message source (6), for controlling the time of alternating current load.
5. the buried metal pipeline corrosion and corrosion protection layer peel test system based on SECM as described in claim 1, feature
It is, the cell system includes: container for holding the Simulated Soil Solution (5) and for clamping the erosion resistant coating
The clamping device of damaged sample (4), the clamping device installation is on the container.
6. the buried metal pipeline corrosion and corrosion protection layer peel test system based on SECM as claimed in claim 5, feature
It is, the container includes: shell (11), bottom plate (12), bolt (13) and pedestal (14)；
The shell (11) is fixedly connected by sealant with the bottom plate (12), and there are four the outer ring processing of the bottom plate (12)
Symmetrical threaded hole, four groups of bolts (13) are put into the threaded hole, and the bottom of every group of bolt (13) passes through screw thread and the bottom
Seat (14) is connected, and realizes that the erosion resistant coating breakage sample (4) is in horizontality by adjusting the bolt (13).
7. the buried metal pipeline corrosion and corrosion protection layer peel test system based on SECM as claimed in claim 6, feature
It is, the clamping device includes: that epoxy packages resin set (15), sealing O circle (16), upper thread ending cover (17), external screw thread are different
Drive connector (18), rubber sheet gasket (19) and lower hex nut (20)；
The erosion resistant coating breakage sample (4) is encapsulated in the epoxy packages resin set (15), the epoxy packages resin set
(15) it is nested into the sealing O circle (16)；The inner surface of sealing O circle (16) upper surface and the upper thread ending cover (17)
It is in contact, lower surface is in contact with the major diameter groove of the external screw thread reducing joint (18)；When screwing the thread ending cover (17)
When with external screw thread reducing joint (18), the epoxy packages resin set (15) is combined closely with sealing O circle (16)；The external screw thread
Reducing joint (18) lower end is convexly equipped with outer-hexagonal end face, and the miner diameter end of the external screw thread reducing joint (18) is inserted into the bottom plate
(12) in, bottom plate (12) lower end surface is in contact with the rubber sheet gasket (19), by turning the lower hex nut (20)
Realize the close contact of the external screw thread reducing joint (18) and bottom plate (12).
8. the buried metal pipeline corrosion and corrosion protection layer peel test system based on SECM as described in claim 1, feature
It is, the scan-type electrochemical microscope test macro includes: scanning probe (1), reference electrode (2), auxiliary platinum plate electrode
(3), erosion resistant coating breakage sample (4), SECM electrochemical workstation (8), PC machine (9), probe fixing frame (29), electric machine controller
(35) and three-dimensional mobile platform (36)；
The SECM electrochemical workstation (8) is connected with the PC machine (9), and the SECM electrochemical workstation (8) is using four electricity
Polar body system, the WE1 electrode of the SECM electrochemical workstation (8) is connected with the scanning probe (1), WE electrode and the anti-corrosion
The damaged sample (4) of layer is connected, RE electrode is connected with the reference electrode (2), CE electrode and auxiliary platinum plate electrode (3) phase
Even；
The scanning probe (1) is connected by the probe fixing frame (29) with the three-dimensional mobile platform (36), the three-dimensional
Mobile platform (36) is for realizing the three-dimensional motion for scanning probe (1)；Three steppings of the three-dimensional mobile platform (36)
Motor (21) is connected with the electric machine controller (35), and the electric machine controller (35) is connected with PC machine (9).
9. the buried metal pipeline corrosion and corrosion protection layer peel test system based on SECM as claimed in claim 8, feature
It is, three guide rail slide units of the three-dimensional mobile platform (36) are distributed along X, Y, Z-space coordinate system, Y-direction guide rail slide unit
It is bolted on the upper plate (26) of X-direction guide rail slide unit, Z-direction guide rail slide unit is solid by triangle support frame (31)
It is scheduled on the upper plate (26) of Y-direction guide rail slide unit, the scanning probe (1) is fixed on Z-direction by probe fixing bracket (29)
On the upper plate (26) of guide rail slide unit；
The structure of three guide rail slide units is identical, Y-direction guide rail slide unit include motor (21), motor support base (22), shaft coupling (23),
Lead screw support base (24), lead screw (25), upper plate (26), ball-screw nut (27), ball-screw nut seat (28), baffle
(30), backing plate (32), guide rail slide block (33) and lower plate (34)；The motor (21) is fixed by screws in the motor support base
(22) on, the motor support base (22) is fixed on the right end of the lower plate (34), and the baffle (32) is fixed on the bottom
The left end of plate (34), guide rail slide block (33) front and back are symmetrically fixed on the lower plate (34)；The motor (21) is logical
Shaft coupling (23) is crossed to be connected with the lead screw (25)；The lead screw support base (24) is located at the left side of shaft coupling (23) and passes through spiral shell
Nail is fixed on the lower plate (34)；The ball-screw nut seat (28) covers on the ball-screw nut (27), institute
It states ball-screw nut seat (28) and is fixed with the upper plate (26) by screw；The upper surface of the backing plate (32) and it is described on
The lower surface of bottom plate (26) is connected, and lower surface is connected with the upper surface of four sliding blocks of the guide rail slide block (33).
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| CN201810717409.3A CN109030337B (en) | 2018-07-03 | 2018-07-03 | Buried metal pipeline corrosion and anticorrosive coating peeling test system based on SECM |
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| CN201810717409.3A CN109030337B (en) | 2018-07-03 | 2018-07-03 | Buried metal pipeline corrosion and anticorrosive coating peeling test system based on SECM |
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| CN109030337B CN109030337B (en) | 2021-05-07 |
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| CN110763874A (en) * | 2019-11-01 | 2020-02-07 | 江苏师范大学 | Method and device for researching metal stress corrosion dynamic process by monitoring pitting corrosion |
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| Publication number | Publication date |
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| CN109030337B (en) | 2021-05-07 |
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