CN210128930U - Device for testing sea cable armor wire gap corrosion experiment - Google Patents
Device for testing sea cable armor wire gap corrosion experiment Download PDFInfo
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- CN210128930U CN210128930U CN201920678527.8U CN201920678527U CN210128930U CN 210128930 U CN210128930 U CN 210128930U CN 201920678527 U CN201920678527 U CN 201920678527U CN 210128930 U CN210128930 U CN 210128930U
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- 238000005260 corrosion Methods 0.000 title claims abstract description 121
- 230000007797 corrosion Effects 0.000 title claims abstract description 121
- 238000012360 testing method Methods 0.000 title claims abstract description 29
- 238000002474 experimental method Methods 0.000 title claims abstract description 26
- 239000013535 sea water Substances 0.000 claims abstract description 28
- 238000003825 pressing Methods 0.000 claims description 8
- 229910021607 Silver chloride Inorganic materials 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 7
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 claims description 7
- 238000000840 electrochemical analysis Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 5
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- 238000011156 evaluation Methods 0.000 abstract description 7
- 239000002184 metal Substances 0.000 abstract description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 6
- 238000004088 simulation Methods 0.000 abstract description 3
- 238000011158 quantitative evaluation Methods 0.000 abstract description 2
- 239000000523 sample Substances 0.000 description 23
- 230000004580 weight loss Effects 0.000 description 4
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000012496 blank sample Substances 0.000 description 2
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- 230000010287 polarization Effects 0.000 description 2
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- 230000035945 sensitivity Effects 0.000 description 2
- 230000005483 Hooke's law Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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Abstract
The utility model discloses a device and evaluation method of submarine cable armor silk material gap corrosion experiment test. At present, an apparatus and a method which can reasonably reflect the seam corrosion risk of the metal armor wires of the submarine cable and provide quantitative evaluation are urgently needed to be established. The utility model comprises a seawater medium experiment box and a crevice corrosion clamp, wherein the crevice corrosion clamp is arranged in the seawater medium experiment box; the seawater medium experiment box is used as a container for containing solution to simulate seawater corrosion environment; the slit corrosion clamp is used as a main body for simulating the slit corrosion of the wires and is used for clamping the wires and adjusting an artificial slit between the two wires; the seam corrosion clamp is a concave supporting seat, and vertical plates on two sides of the seam corrosion clamp are respectively provided with two supporting limiting holes on a coaxial straight line. The utility model discloses the gap size is adjusted and tensile stress is exerted on the sample to the accessible is adjusted gap corrosion fixture, and simulation armor silk material is in service operating mode.
Description
Technical Field
The utility model belongs to metal material gap corrosion test field relates to a device of submarine cable armor silk material gap corrosion experiment test.
Background
With the construction of the global energy internet, submarine cables are developing towards higher voltage levels, greater run lengths and higher transport capacities. The submarine cable is mainly used for power supply at long distances such as bay crossing, between land and islands, between islands and islands, between offshore platforms and land or islands, between submarine production facilities and platforms or onshore terminals, between sea-based power generation facilities and onshore terminals, and the like. As the submarine cable is laid on the seabed and exposed in the seawater environment for a long time, the metal armor wires are easy to corrode and wear, thereby causing wire breakage and influencing the protection effect and the service life of the submarine cable. Therefore, the corrosion evaluation of the metal armor layer of the submarine cable is a key element for carrying out submarine cable protection design, operation maintenance, service life evaluation and optimization improvement. However, since the submarine cable is developed rapidly, an evaluation method for the structural and risk characteristics of the submarine cable is still lacked for the corrosion evaluation of the metal armor layer of the submarine cable.
The submarine cable armor layer is formed by twisting a plurality of metal wires, certain gaps are formed among single armor wires and between the armor wires and the internal insulating layer, and the gaps are easy to corrode in seawater and sea mud. The armor wires bear tensile and torsional loads in the axial direction and are extruded mutually in the transverse direction, the structural characteristics of the armor wires allow seawater media to penetrate through the armor layer, and submarine cables laid on a seabed generate certain transverse swing and possibly generate local abrasion under the action of ocean currents, so that the corrosion of the armor wires is further deteriorated.
Although crevice corrosion of metal materials is a well-known corrosion type, a specific crevice corrosion evaluation tool or method is still lacked for the specific structure of the armor layer of the submarine cable, and the loading state and seawater environment caused by the operation condition of the submarine cable. The traditional crevice corrosion experimental method and device are difficult to simulate the special working condition and scientifically reflect crevice corrosion rules and corrosion electrochemical parameters of the armored wire of the submarine cable. Therefore, it is urgently needed to establish a device and a method which can reasonably reflect the crevice corrosion risk of the metal armored wire of the submarine cable and provide quantitative evaluation.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that overcome the defect that above-mentioned prior art exists, provide a device of submarine cable armor silk material gap corrosion experiment test, its gap corrosion action that can simulate submarine cable armor silk material in the sea water.
Therefore, the utility model adopts the following technical scheme: a device for testing a sea cable armor wire gap corrosion experiment comprises a sea water medium experiment box and a gap corrosion clamp, wherein the gap corrosion clamp is arranged in the sea water medium experiment box;
the seawater medium experiment box is used as a container for containing solution to simulate seawater corrosion environment; the slit corrosion clamp is used as a main body for simulating the slit corrosion of the wires and is used for clamping the wires and adjusting an artificial slit between the two wires;
the slit corrosion clamp is a concave-shaped supporting seat, and vertical plates on two sides of the slit corrosion clamp are respectively provided with two supporting limiting holes on a coaxial straight line for two parallel wires to pass through; pressing the wires on the end parts of the gap corrosion clamps by adopting a pressing plate and a pressing plate fastening screw on the outer sides of the two vertical plates; longitudinal positioning grooves parallel to the vertical plates are respectively arranged on the inner sides of the two vertical plates, each longitudinal positioning groove is provided with two clamping blocks, the two clamping blocks are used for compressing wires positioned between the two clamping blocks, and the manual gap between the two wires is adjusted by fixing and adjusting the compression degree through screws and nuts penetrating through the clamping blocks; the tensile stress at the middle part of the wire is realized by utilizing the two pressing plates and the clamping blocks at the inner sides of the vertical plates.
Furthermore, the device for testing the submarine cable armored wire gap corrosion experiment also comprises an electrochemical testing system, wherein the middle part of the wire is used as a working electrode, a platinum wire parallel to the artificial gap of the wire is used as an auxiliary electrode, an Ag/AgCl electrode is used as a reference electrode to form an electrochemical testing loop of a three-electrode system, and the electrochemical testing loop is connected with an external electrochemical workstation to realize the monitoring of potential and the artificial gap corrosion current density.
Furthermore, the seawater medium experiment box is provided with two fixing seats for fixing the gap corrosion clamp at the bottom and a sealable upper cover at the top.
Furthermore, the upper cover is provided with an air inlet pipe and an air outlet pipe, and the solution is deaerated by ventilation.
Furthermore, a liquid inlet pipe and a liquid discharge pipe are arranged on the box body of the seawater medium experiment box.
Furthermore, a boss is arranged at the end part of the slot corrosion clamp, and the boss is used for separating the two wires positioned at the end part of the slot corrosion clamp.
Furthermore, the longitudinal positioning groove is a dovetail groove, and the shape of the lower part of the clamping block is matched with that of the dovetail groove.
In the aspect of the device, the functions of seawater gap corrosion experiment and test of the submarine cable armored wire are realized by an experimental box capable of simulating a seawater medium, a clamp for constructing an artificial gap of the armored wire, a mechanism for providing tension borne by the armored wire, circuit connection for providing a gap corrosion electrochemical test, electrode arrangement and the like.
The utility model provides a gap corrosion device of armor wires in seawater solution, which can quantitatively add simulation solution, thereby simulating the environment of actual laying of submarine cables, simulating the actual corrosion working condition of submarine cables and obtaining accurate corrosion rules; a detachable crevice corrosion clamping device is adopted, so that the sample is convenient to mount and dismount; the size of the gap can be adjusted by adjusting the gap corrosion clamp, tensile stress is applied to the sample, and the service working condition of the armor wire is simulated; the electrochemical monitoring can be implemented on the material crevice corrosion process, crevice corrosion and electrochemical testing can be simultaneously carried out, and the electrochemical state change in the sample crevice corrosion process can be conveniently detected in real time.
Drawings
FIG. 1 is a schematic structural view of the present invention (excluding the electrochemical test system);
FIG. 2 is a schematic structural view of the crevice corrosion jig of the present invention (excluding the pressing plate);
FIG. 3 is a front view of the crevice corrosion fixture of the present invention;
FIG. 4 is a top view of the crevice corrosion fixture of the present invention;
FIG. 5 is a left side view of the crevice corrosion fixture of the present invention in use;
FIG. 6 is a sectional view taken along line A-A of FIG. 5;
FIG. 7 is a top view of the clamp block of the present invention in use;
fig. 8 is a schematic diagram of an electrochemical testing system of the present invention.
In the figure, 1-liquid inlet pipe, 2-gas inlet pipe, 3-gas outlet pipe, 4-wire, 5-liquid outlet pipe, 6-pressing plate fastening screw, 7-fixing seat, 8-longitudinal positioning groove, 9-clamp fixing bolt, 10-slit corrosion clamp, 11-seawater medium experiment box, 12-supporting limiting hole, 13-boss, 14-clamping block, 15-screw rod and nut, 16-platinum wire electrode, 17-Ag/AgCl reference electrode, 18-electrochemical workstation and 19-pressing plate.
Detailed Description
In order to clearly understand the technical features, objects and effects of the present invention, the detailed embodiments of the present invention will be described with reference to the drawings.
Referring to the figures 1-8, the utility model provides a device of submarine cable armor silk material gap corrosion experiment test, it is by feed liquor pipe 1, intake pipe 2, blast pipe 3, fluid-discharge tube 5, clamp plate fastening screw 6, fixing base 7, vertical positioning groove 8, anchor clamps fixing bolt 9, gap corrosion anchor clamps 10, sea water medium experimental box 11 supports spacing hole 12, boss 13, clamp splice 14, screw rod and nut 15, platinum wire electrode 16, Ag AgCl reference electrode 17, electrochemical workstation 18 and clamp plate 19 are constituteed. The seawater medium box 11 is provided with a fixing seat 7, the fixing seat 7 is provided with a gap corrosion clamp 10 provided with 4 wire samples, the gap corrosion clamp 10 is connected with the fixing seat 7 through a clamp fixing bolt 9, the two wire samples respectively pass through supporting limiting holes 12 on two sides and are fixed on the gap corrosion clamp 10, tensioning of the wire samples is realized through a pressure plate fastening screw 6, a boss 13 and a pressure plate 19, the bottom of a clamping block 14 with the width of an artificial gap is inserted into a longitudinal positioning groove 8 (a dovetail groove in the example), the gap between the clamping blocks 14 is adjusted by a screw rod and a nut 15 so as to adjust the width of the artificial gap of an experimental section, a polytetrafluoroethylene film is used for separating the two wire samples at the clamping block so as to ensure the insulation of the wire samples at the clamping section, and tensile stress is formed at the middle experimental section by the. A platinum wire electrode 16 is used as a counter electrode, a wire sample is placed below the artificial gap in parallel, an Ag/AgCl reference electrode 17 is placed above the artificial gap, one wire sample is selected as a working electrode, and the working electrode, the Ag/AgCl reference electrode 17 and the platinum wire electrode 16 are connected to an electrochemical workstation 18 together.
The experimental process comprises the following steps: and (3) mounting the wire sample on a crevice corrosion clamp, and adjusting the size of the artificial crevice to meet the crevice corrosion simulation requirement (0.01-0.1 mm). The whole gap corrosion clamp is fixed on the fixed seat, quantitative simulated seawater solution is injected into the gap corrosion clamp through the liquid inlet pipe, and nitrogen is introduced into the gap corrosion clamp through the air inlet pipe and the exhaust pipe to remove oxygen. A wire sample is taken as a working electrode, a platinum wire electrode is placed right below the artificial gap and is parallel to the gap, an Ag/AgCl reference electrode is placed nearby the upper part of the artificial gap, and leads led out of the three electrodes are connected to electrodes corresponding to an electrochemical workstation. And the electrochemical workstation is used for recording a corrosion current density and time curve and monitoring the change of the crevice corrosion current density.
When the clamping block extrudes a wire sample, the wire material generates bending stress, the distance rho between the extrusion position of the clamping block and a support limiting hole of the wire sample is, a unit body with the micro-deformation width dx is separated, the length of the unit body before deformation is ab, the width of the unit body is y, the length of the unit body after deformation is a 'b', the width of the unit body before deformation is y, the bending angle d theta is as follows the positive strain of the a 'b':
the wire is an elastic material, so that the wire can be applied to Hooke's law, and the positive stress is as follows:
wherein σ is a positive stress, N; e is the modulus of elasticity, kN/m2(ii) a y is the width of the wire sample, m; rho is the distance m from the extrusion position of the clamping block to the supporting limiting hole.
When the clamping blocks extrude the wire material sample to keep a certain gap size, the positive pressure generated on the wire material sample can cause the generation of deflection, and if the load is uniformly distributed at the moment, the relationship between the uniformly distributed load and the deflection is as follows:
wherein D ismaxM is the maximum deflection; q is load concentration, kN/m; l is span, m; e is the modulus of elasticity, kN/m2(ii) a J is the moment of inertia, mm4。
If the line load is the line load, the line load and the deflection are in a relation of:
wherein D ismaxM is the maximum deflection; q. q.s1kN/m as an external line load; l is span, m; e is the modulus of elasticity, kN/m2(ii) a J is the moment of inertia, mm4；q0The sample's own linear load, kN/m.
Weighing the mass of a wire sample before and after an experiment by using an electronic balance to obtain the weight loss caused by corrosion of the sample △ w, measuring the length d of a wire test section between a left clamping block and a right clamping block and the arc length or side length l of an artificial gap formed by the wire by using a vernier caliper (if not specially specified, the corresponding arc length is taken for the wire with a circular section, and the corresponding side length is taken for the wire with a square screenshot), and calculating the weight loss corrosion rate by taking the product of the two as the corrosion area of the sample gap:
wherein, CRcIn mm/a, △ w is the corrosion weight loss of the sample g, d is the length of the artificial gap section wire (i.e. the length of the test section of the wire between the left and right groups of clamping blocks) cm, l is the arc length or side length of the artificial gap cm, t is the corrosion test period of the sample h, rho is the density of the wire sample g/cm3。
Local corrosion size measurement and calculation: taking out the tested wire sample, observing the surface corrosion state of the artificial slit section of the wire by using a metallographic microscope or a laser confocal electron microscope, selecting 10 points on the surface of the sample to measure the depth of the etch pit, recording the maximum depth h and the maximum length delta, and calculating the local corrosion rate:
wherein, CRlcThe local corrosion rate of the crevice corrosion is mm/a; h is the maximum depth of the crevice corrosion pit, mm.
Monitoring crevice corrosion by using corrosion electrochemical parameters: connecting the wire sample, the platinum wire electrode and the reference electrode into an electrochemical workstation, measuring and recording the corrosion potential V of the sample after 1h1Then recording corrosion potential data V every two hoursiThe relationship between the corrosion potential data and the time can be drawn. Then testing different time polarization curves through the linear polarization resistor to obtain the crevice corrosion currentDensity ic。
Average crevice corrosion rate CR under different test specimens and different experimental conditionscMaximum crevice corrosion depth h, crevice corrosion pit depth/length ratio (delta/h), crevice corrosion local corrosion rate CRlcStabilized crevice corrosion current density icCan be used as an evaluation index of the severity degree of crevice corrosion.
Setting a reference sample as a blank sample in a container, and testing the weight loss corrosion rate CR of the reference sample0And the corrosion is reduced by a thinning amount h0And corrosion current density ic0Average crevice corrosion rate CR obtained from crevice corrosion test piececMaximum corrosion depth h, crevice corrosion current density icThe crevice corrosion rate sensitivity η was obtained by dividing the value of the blank samplecSensitivity to crevice corrosion depth ηhElectrochemical susceptibility to crevice corrosion ηiComparing η obtained from different material samples and simulated environmentc、ηh、ηiThe crevice corrosion sensitivity of the armor wire under different environments can be obtained.
The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.
Claims (7)
1. A device for testing a submarine cable armor wire gap corrosion experiment is characterized by comprising a seawater medium experiment box (11) and a gap corrosion clamp (10), wherein the gap corrosion clamp (10) is arranged in the seawater medium experiment box (11);
the seawater medium experiment box (11) is used as a container for containing solution to simulate seawater corrosion environment; the slit corrosion clamp (10) is used as a main body for simulating the slit corrosion of the wires and is used for clamping the wires (4) and adjusting the artificial slit between the two wires;
the slit corrosion clamp (10) is a concave supporting seat, and vertical plates on two sides of the slit corrosion clamp are respectively provided with two supporting and limiting holes (12) on a coaxial straight line for two parallel wires (4) to pass through; the wire (4) is pressed tightly on the end part of the gap corrosion clamp by adopting a pressure plate (19) and a pressure plate fastening screw (6) at the outer sides of the two vertical plates; longitudinal positioning grooves (8) parallel to the vertical plates are respectively arranged on the inner sides of the two vertical plates, two clamping blocks (14) are arranged in each longitudinal positioning groove (8), the two clamping blocks are used for compressing wires positioned between the two clamping blocks, the compression degree is fixed and adjusted by using screws and nuts (15) penetrating through the clamping blocks, and the size of an artificial gap between the two wires is adjusted; the tensile stress in the middle of the wire is realized by using two pressing plates (19) and a clamping block (14) at the inner side of a vertical plate.
2. The device for experimental corrosion test of the gap of the armored wire of the submarine cable according to claim 1, further comprising an electrochemical test system, wherein the electrochemical test system takes the middle part of the wire as a working electrode, a platinum wire electrode (16) parallel to the artificial gap of the wire as an auxiliary electrode, and an Ag/AgCl electrode (17) as a reference electrode to form an electrochemical test loop of a three-electrode system, and is connected with an external electrochemical workstation (18) to realize monitoring of potential and the current density of the artificial gap corrosion.
3. The device for testing the crevice corrosion of the armor wire of the submarine cable according to claim 1, wherein the seawater medium experiment box (11) has two fixing seats (7) for fixing crevice corrosion clamps at the bottom and a sealable top cover at the top.
4. The device for testing the corrosion experiment of the gaps of the armor wires of the submarine cable according to claim 3, wherein the upper cover is provided with an air inlet pipe (2) and an air outlet pipe (3), and the solution is deaerated by ventilation.
5. The device for testing the crevice corrosion of the armoured wire of the submarine cable according to claim 1, wherein the box body of the seawater medium experimental box is provided with a liquid inlet pipe (1) and a liquid outlet pipe (5).
6. An apparatus for testing crevice corrosion of armoured submarine cable wires according to any one of claims 1 to 5, wherein the crevice corrosion jig has a projection (13) at its end, the projection (13) separating the wires at the end of the crevice corrosion jig.
7. The marine cable armor wire slot corrosion experimental test device according to any one of claims 1-5, wherein the longitudinal positioning groove (8) is a dovetail groove, and the shape of the lower part of the clamp block (14) is matched with the dovetail groove.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920678527.8U CN210128930U (en) | 2019-05-13 | 2019-05-13 | Device for testing sea cable armor wire gap corrosion experiment |
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| CN201920678527.8U CN210128930U (en) | 2019-05-13 | 2019-05-13 | Device for testing sea cable armor wire gap corrosion experiment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146435A (en) * | 2019-05-13 | 2019-08-20 | 国网浙江省电力有限公司电力科学研究院 | A kind of device and evaluation method of sea cable armouring silk material crevice corrosion experiment test |
| CN113933667A (en) * | 2021-11-08 | 2022-01-14 | 国网浙江省电力有限公司电力科学研究院 | Submarine cable aging test device and method under simulated operation environment |
-
2019
- 2019-05-13 CN CN201920678527.8U patent/CN210128930U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146435A (en) * | 2019-05-13 | 2019-08-20 | 国网浙江省电力有限公司电力科学研究院 | A kind of device and evaluation method of sea cable armouring silk material crevice corrosion experiment test |
| CN110146435B (en) * | 2019-05-13 | 2024-02-13 | 国网浙江省电力有限公司电力科学研究院 | Submarine cable armoured wire crevice corrosion experimental test device and evaluation method |
| CN113933667A (en) * | 2021-11-08 | 2022-01-14 | 国网浙江省电力有限公司电力科学研究院 | Submarine cable aging test device and method under simulated operation environment |
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