CN111443030A - Method for testing salt spray corrosion resistance of steel wire in stress state - Google Patents
Method for testing salt spray corrosion resistance of steel wire in stress state Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 147
- 239000010959 steel Substances 0.000 title claims abstract description 147
- 238000012360 testing method Methods 0.000 title claims abstract description 38
- 238000005260 corrosion Methods 0.000 title claims abstract description 36
- 230000007797 corrosion Effects 0.000 title claims abstract description 33
- 150000003839 salts Chemical class 0.000 title claims abstract description 28
- 239000007921 spray Substances 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000007246 mechanism Effects 0.000 claims abstract description 8
- 230000000149 penetrating effect Effects 0.000 claims abstract description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 11
- 239000010935 stainless steel Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 4
- 238000005536 corrosion prevention Methods 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 239000003595 mist Substances 0.000 description 2
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- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
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- 238000009434 installation Methods 0.000 description 1
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- 238000010998 test method Methods 0.000 description 1
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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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Abstract
The invention relates to a method for testing the salt spray corrosion resistance of a steel wire in a stress state, which comprises the following steps: 1) firstly, a steel wire penetrates through a top plate and an anchor cup, and then the upper end of the steel wire is upset; 2) a screw positioning mechanism which screws the loading nut into the steel wire loading screw and places the tail end of the steel wire loading screw on the lower surface of the top plate; 3) the bottom plate is inserted into the bottom end of the steel wire and the steel wire loading screw in an aligning way, and then the distance between the top plate and the bottom plate is adjusted by screwing the loading nut and is pre-tightened; 4) penetrating an anchor cup below the bottom plate into a steel wire, and then upsetting the lower end of the steel wire; 5) marking or attaching a strain gauge on a steel wire, screwing a locking nut, and loading the steel wire to 45-70% of the steel wire breaking load; 6) and finally, putting the assembled device into a salt spray box for a salt spray test. The invention adopts the loading screw rod to be matched with the top plate and the bottom plate which are arranged in parallel to fasten the steel wire and maintain the stress state, and can overcome the problem that the steel wire can not maintain the stress state for a long time.
Description
Technical Field
The invention belongs to the technical field of steel wire test and test, and particularly relates to a method for testing salt spray corrosion resistance of a steel wire in a stress state.
Background
The development stage of the large-span bridge construction in our country is in a sudden and violent development since the innovation is open, particularly, large-span cable-stayed bridges and suspension bridges are still in the vogue, and the design and construction level of the bridge in our country enters an advanced line. However, problems arise, and one of the disadvantages of the durability and safety of the bridge cable structure is faced. Meanwhile, the country is building a conservation-oriented society, the improvement of the durability of the engineering structure is an effective measure for saving engineering construction resources, and the prolonging of the service life of the engineering is the maximum resource saving. With the development of material technology, corrosion of bridge cables is a major factor leading to their failure. For bridge cables in marine environments, the above problems are more pronounced. The corrosion resistance of the traditional bridge cable steel wire is mainly detected and evaluated by adopting an accelerated salt spray test, the method can better simulate the ocean and chloride ion environment, and the test result has a certain reference value. However, since the bridge cable steel wire is always in a complex stress state, the corrosion of the steel wire under the combined action of stress and a corrosion medium is accelerated. Stress corrosion has the following characteristics: there is a tensile stress, the greater the tensile stress the faster the corrosion. A certain tensile stress is a necessary condition for stress corrosion cracking to occur. Generally, the greater the stress, the shorter the time for corrosion cracking to occur, and less than a certain stress value, referred to as the critical value of stress corrosion, cracking does not occur. The stress corrosion is directly related to the coating of the steel wire, the diameter of the steel wire and the strength of the steel wire. The traditional salt spray test method cannot simulate stress corrosion under complicated stress conditions above steel wires, so the test result has certain limitation on the evaluation of the durability of the cable of an actual bridge.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for testing the salt spray corrosion resistance of a steel wire in a stress state aiming at the prior art, and the method can effectively evaluate the durability of a cable of an actual bridge.
The technical scheme adopted by the invention for solving the problems is as follows: a method for testing the salt spray corrosion resistance of a steel wire in a stress state comprises the following steps: the method comprises the following steps:
1) firstly, a steel wire penetrates through a steel wire hole formed in the top plate and an anchor cup above the top plate, and then the upper end of the steel wire is upset;
2) a screw positioning mechanism which is used for screwing the loading nut into a proper position at the lower part of the steel wire loading screw and placing the tail end of the steel wire loading screw on the lower surface of the top plate;
3) aligning a steel wire hole and a bolt hole formed in the bottom plate with the bottom ends of a steel wire and a steel wire loading screw rod, inserting the steel wire hole and the bolt hole into the steel wire loading screw rod to enable the loading nut to be located above the bottom plate, then adjusting the distance between the top plate and the bottom plate by screwing the loading nut, screwing a locking nut into the steel wire loading screw rod after the locking nut is adjusted to a proper position, and pre-tightening the locking nut;
4) penetrating an anchor cup below the bottom plate into a steel wire, and then upsetting the lower end of the steel wire;
5) marking or attaching a strain gauge on the steel wire, and finally screwing a locking nut on the loading screw rod to load the steel wire to 45-70% of the steel wire breaking load;
6) and finally, putting the assembled device into a salt spray box for a salt spray test, and realizing a simulation test of stress corrosion of the bridge cable under the high-strength steel wire in a stress state.
Preferably, the top plate and the bottom plate are stainless steel plates with the thickness of 20 mm-60 mm.
Preferably, the diameter of the steel wire holes is phi 5 mm-phi 9mm, and the distance between the steel wire holes is more than 125mm
Preferably, the screw rod positioning mechanism is a counter bore which is pre-processed on the lower surface of the top plate, the diameter of the counter bore is 1.05-1.10 times of the diameter of the anchor cup, and the depth of the counter bore is 2-3 mm.
Preferably, the bolt holes are through holes with the diameter of 20 mm-30 mm, and the distance is more than 140 mm.
Preferably, pier heads are formed at two ends of the steel wire, the diameter of each pier head is not less than 1.5 times of the diameter of the steel wire, and the height of each pier head is not less than 1 time of the diameter of the steel wire.
Preferably, the anchor cup is a steel wire monofilament anchor cup with a through hole in the center, wherein the outer diameter of the anchor cup is phi 25mm, the diameter of the through hole is phi 5 mm-phi 8mm, the anchor cup is processed by adopting a strength material with a steel grade of more than 45, and heavy anti-corrosion paint is coated for corrosion prevention after processing, or stainless steel is adopted.
Preferably, a pressure sensor is arranged between the anchor cup at the lower end of the steel wire and the lower surface of the bottom plate, and the bottom end of each steel wire is respectively and independently provided with the pressure sensor.
Compared with the prior art, the invention has the advantages that:
1. the invention adopts the loading screw rod to be matched with the top plate and the bottom plate which are arranged in parallel to fasten the steel wire and maintain the stress state, and can overcome the problem that the steel wire can not maintain the stress state for a long time.
2. The invention can realize corrosion test tests under different stress conditions, and is particularly suitable for long-term environmental corrosion conditions.
3. The invention adopts a stress and corrosion integrated structure, has simple tooling, simple and convenient operation and space saving, and can simultaneously carry out a plurality of groups of tests in a laboratory.
Drawings
Fig. 1 is a schematic structural view of a top plate in an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a base plate in an embodiment of the present invention.
FIG. 3 is a schematic structural diagram of a loading screw in an embodiment of the present invention.
FIG. 4 is a schematic diagram of the structure of a test wire bond anchor cup in an embodiment of the present invention.
Fig. 5 is a schematic view showing a structure in which the inspection steel wire is mounted on the top plate in the embodiment of the present invention.
FIG. 6 is a schematic structural diagram of the embodiment of the invention in which the test wire and the loading screw are mounted on the top plate and the bottom plate (the lower anchor cup is not mounted).
FIG. 7 is a schematic structural view of an anchor cup in an embodiment of the present invention.
FIG. 8 is a schematic structural diagram of the embodiment of the invention in which the inspection steel wire and the loading screw are mounted on the top plate and the bottom plate.
Fig. 9 is a schematic view of a structure in which the pressure sensor is mounted in the embodiment of the present invention.
FIG. 10 is a schematic diagram of the arrangement of the present invention in a salt spray resistant tank.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The embodiment provides a device for testing salt spray corrosion resistance of a steel wire in a stress state, which comprises a top plate 1, a bottom plate 2 and a steel wire loading screw rod 3,
as shown in figure 1, the top plate 1 is a stainless steel plate with a thickness of 20 mm-60 mm, a group of steel wire holes with a diameter of 5 mm-9 mm are processed on the stainless steel plate at certain intervals, and the distance between the steel wire holes is more than 125mm, so that a plurality of groups of steel wires can be conveniently anchored. The lower plane of the top plate 1 is provided with a screw positioning mechanism, so that the screw is perpendicular to the upper top plate during assembly, and the screw is prevented from being inclined to influence the stress of the steel wire. The positioning mechanism is a counter bore which is processed in advance for an upper top plate. The diameter of the counter bore is 1.05 to 1.10 times of the diameter of the anchor cup, and the depth of the counter bore is 2 to 3 mm.
As shown in figure 2, the bottom plate 2 is also made of a stainless steel plate with the thickness of 20 mm-60 mm, a group of steel wire holes with the thickness of phi 5 mm-phi 9mm are processed on the stainless steel plate at certain intervals, and the distance between the steel wire holes is more than 125mm, so that a plurality of groups of steel wires can be conveniently anchored. The top plate 1 and the bottom plate 2 are arranged in parallel, and the steel wire holes are arranged correspondingly. And bolt holes are formed in the bottom plate 2 at positions corresponding to the counter bores of the top plate 1, the bolt holes are through holes with the diameters of 20 mm-30 mm, the distance between steel wire anchoring holes is considered, and the distance between the bolt holes is more than 140mm, so that the bolt holes can conveniently penetrate through the steel wire loading screw rods 3.
As shown in fig. 3, the loading screw 3 is a stainless steel bolt with a diameter not less than 20mm, and two nuts are arranged on the stainless steel bolt, wherein one nut is used for loading and the other nut is used for self-locking.
As shown in fig. 4 to 5, the steel wire 6 as the inspection object passes through the corresponding steel wire holes of the top plate 1 and the bottom plate 2 in sequence, both ends of the steel wire 6 are fixed by the anchor cups 7, respectively, and the steel wire 6 is fixed between the top plate 1 and the bottom plate 2. Pier heads are formed at two ends of the steel wire 6, the diameter of each pier head is not less than 1.5 times of the diameter of the steel wire, and the height of each pier head is not less than 1 time of the diameter of the steel wire.
As shown in fig. 6, the tail end of the wire loading screw 3 is placed in a counter bore as a screw positioning mechanism, the head part passes through a bolt hole on the bottom plate 2, and a loading nut 4 and a locking nut 5 are respectively arranged on the wire loading screw 3 on the upper side and the lower side of the bolt hole on the bottom plate 2.
As shown in fig. 7, the anchor cup 7 is a steel wire monofilament anchor cup with a through hole at the center, wherein the outer diameter of the anchor cup is phi 25mm, and the diameter of the through hole is phi 5 mm-phi 8mm, so that a steel wire can conveniently pass through the through hole. The anchor cup is made of a strength material with a steel grade of more than 45, and is coated with heavy anti-corrosion paint for corrosion prevention after being processed, or is made of stainless steel.
As shown in fig. 8, in order to equalize the loading stress applied to each set of steel wires, the steel wire loading screws 3 and the steel wires 6 are arranged on the top plate 1 and the bottom plate 2 at equal intervals, in the embodiment, there are four sets of steel wires 6 and three sets of steel wire loading screws 3, and each set of steel wire loading screws 3 is respectively arranged between two adjacent sets of steel wires 6.
As shown in fig. 9, for the convenience of detecting the load on the steel wire and ensuring the consistency of the steel wire load, a pressure sensor 8 is arranged between the anchor cup 7 at the lower end of the steel wire 6 and the lower surface of the bottom plate 2, and the bottom end of each steel wire is respectively and independently provided with the pressure sensor 8, so that when a stress test is performed, the load on each steel wire can be effectively and visually monitored through the loading nut 4 on the steel wire loading screw rod 3, and whether the load on each steel wire is consistent can be found on the other hand, so that the adjustment is convenient, and the accuracy of the test is ensured.
The embodiment provides an implementation method of the test device, which comprises the following steps:
1) firstly, the steel wire penetrates through the top plate and the anchor cup above the top plate, and then the upper end of the steel wire is upset. The upset diameter is no less than 1.5 times the wire diameter and the upset height is no less than 1 time the wire diameter as shown in figure 5 below.
2) The loading nut is screwed into the lower part of the steel wire loading screw at a proper position, and the tail end of the steel wire loading screw is placed in the counter bore on the lower surface of the top plate, as shown in fig. 6.
3) The bottom plate is inserted from the bottom ends of the steel wire and the steel wire loading screw rod, so that the loading nut is positioned above the bottom plate, then the distance between the top plate and the bottom plate is adjusted by screwing the loading nut, after the loading nut is adjusted to a proper position, the locking nut is screwed into the steel wire loading screw rod, and the steel wire loading screw rod is pre-tightened, as shown in fig. 6.
4) The anchor cup below the bottom plate is penetrated into the steel wire, and then the lower end of the steel wire is upset, wherein the diameter of the upset is not less than 1.5 times of the diameter of the steel wire, and the height of the upset is not less than 1 time of the diameter of the steel wire, as shown in figure 8.
5) Marking or attaching a strain gauge on the steel wire, and finally screwing a locking nut on the loading screw rod to load the steel wire to 45% -70% of the steel wire breaking load, as shown in fig. 8. Scales or other marks are not required to be arranged on the screw rods, and uniform force application of the plurality of screw rods is guaranteed.
6) Finally, the assembled device is placed into a salt spray box to carry out a salt spray test, so that a (comparative) simulation test of stress corrosion of the bridge cable in a high-strength steel wire stress state is realized, and the test is shown in fig. 10.
As shown in fig. 9, the steel wire stress elongation method or the installation of the pressure sensor is adopted in the test process to ensure that the load on the steel wire is consistent. When the loads on the steel wires are inconsistent, the upper nut and the lower nut on the screw rod are adjusted until the loads acting on the steel wires are basically consistent.
If the mode of installing the pressure sensor is adopted, the pressure sensor is protected from salt mist corrosion in the salt mist test process.
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.
Claims (8)
1. A method for testing the salt spray corrosion resistance of a steel wire in a stress state comprises the following steps: the method is characterized in that: the method comprises the following steps:
1) firstly, a steel wire penetrates through a steel wire hole formed in the top plate and an anchor cup above the top plate, and then the upper end of the steel wire is upset;
2) a screw positioning mechanism which is used for screwing the loading nut into a proper position at the lower part of the steel wire loading screw and placing the tail end of the steel wire loading screw on the lower surface of the top plate;
3) aligning a steel wire hole and a bolt hole formed in the bottom plate with the bottom ends of a steel wire and a steel wire loading screw rod, inserting the steel wire hole and the bolt hole into the steel wire loading screw rod to enable the loading nut to be located above the bottom plate, then adjusting the distance between the top plate and the bottom plate by screwing the loading nut, screwing a locking nut into the steel wire loading screw rod after the locking nut is adjusted to a proper position, and pre-tightening the locking nut;
4) penetrating an anchor cup below the bottom plate into a steel wire, and then upsetting the lower end of the steel wire;
5) marking or attaching a strain gauge on the steel wire, and finally screwing a locking nut on the loading screw rod to load the steel wire to 45-70% of the steel wire breaking load;
6) and finally, putting the assembled device into a salt spray box for a salt spray test, and realizing a simulation test of stress corrosion of the bridge cable under the high-strength steel wire in a stress state.
2. The method for testing the salt spray corrosion resistance of a steel wire under stress according to claim 1, wherein the method comprises the following steps: the top plate and the bottom plate are stainless steel plates with the thickness of 20 mm-60 mm.
3. The method for testing the salt spray corrosion resistance of a steel wire under stress according to claim 1, wherein the method comprises the following steps: the diameter of the steel wire holes is phi 5 mm-phi 9mm, and the distance between the steel wire holes is more than 125 mm.
4. The device for testing the salt spray corrosion resistance of the steel wire in the stress state according to claim 1, wherein: the screw rod positioning mechanism is a counter bore which is pre-processed on the lower surface of the top plate, the diameter of the counter bore is 1.05-1.10 times of the diameter of the anchor cup, and the depth of the counter bore is 2-3 mm.
5. The device for testing the salt spray corrosion resistance of the steel wire in the stress state according to claim 1, wherein: the bolt holes are through holes with the diameter of 20 mm-30 mm, and the distance is more than 140 mm.
6. The device for testing the salt spray corrosion resistance of the steel wire in the stress state according to claim 1, wherein: pier heads are formed at two ends of the steel wire, the diameter of each pier head is not less than 1.5 times of the diameter of the steel wire, and the height of each pier head is not less than 1 time of the diameter of the steel wire.
7. The device for testing the salt spray corrosion resistance of the steel wire in the stress state according to claim 1, wherein: the anchor cup is a steel wire monofilament anchor cup with a through hole in the center, wherein the outer diameter of the anchor cup is phi 25mm, the diameter of the through hole is phi 5 mm-phi 8mm, the anchor cup is processed by adopting a strength material with the steel grade of more than 45, and after processing, heavy anti-corrosion paint is coated for corrosion prevention, or stainless steel is adopted.
8. The device for testing the salt spray corrosion resistance of the steel wire in the stress state according to claim 1, wherein: and a pressure sensor is arranged between the anchor cup at the lower end of the steel wire and the lower surface of the bottom plate, and the bottom end of each steel wire is respectively and independently provided with the pressure sensor.
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| CN202010257763.XA CN111443030A (en) | 2020-04-03 | 2020-04-03 | Method for testing salt spray corrosion resistance of steel wire in stress state |
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| CN202010257763.XA CN111443030A (en) | 2020-04-03 | 2020-04-03 | Method for testing salt spray corrosion resistance of steel wire in stress state |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114264591A (en) * | 2021-12-23 | 2022-04-01 | 中国兵器工业第五九研究所 | Device and method for evaluating corrosion appearance of metal standard part |
| CN114905442A (en) * | 2022-06-21 | 2022-08-16 | 哈尔滨工业大学 | Special fixture for loading and positioning high-strength steel wire |
| CN115165578A (en) * | 2022-06-25 | 2022-10-11 | 桂林理工大学 | Multi-action coupling multi-steel-strand detachable test device and method |
| CN115389409A (en) * | 2022-08-30 | 2022-11-25 | 同济大学 | High-strength steel wire holding force corrosion test device and method capable of clamping multiple test pieces |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114264591A (en) * | 2021-12-23 | 2022-04-01 | 中国兵器工业第五九研究所 | Device and method for evaluating corrosion appearance of metal standard part |
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| CN115389409A (en) * | 2022-08-30 | 2022-11-25 | 同济大学 | High-strength steel wire holding force corrosion test device and method capable of clamping multiple test pieces |
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Application publication date: 20200724 |