Corrosion-resistant anchor cable anchorage device and production process thereof

Abstract

The invention discloses a corrosion-resistant anchor cable anchorage device and a production process thereof, after the anchor cable anchorage device is cleaned, a permeating agent is used for heating co-permeation, and an alloyed anchor cable anchorage device is obtained; the alloyed anchor cable anchorage device is subjected to supersonic particle bombardment, and a pretreated anchor cable anchorage device is obtained; and the pretreated anchor cable anchorage device is subjected to nitriding treatment, high-current pulsed electron beam treatment, boriding treatment and heat treatment, and the corrosion-resistant anchor cable anchorage device is obtained. Through surface treatment on the anchor cable anchorage device, the corrosion resistance is obviously improved, the service life is prolonged, and the use safety is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of anchor cable and anchorage processing technology, specifically relating to a corrosion-resistant anchor cable and anchorage and its manufacturing process. Background Technology

[0002] Anchor cables and anchorages are connected by prestressed steel strands to form a support structure, which is the core component of the prestressed anchor cable system.

[0003] Anchor cables are suitable for high slope protection, deep foundation pit support, and other engineering projects. They are load-bearing components composed of high-strength steel strands or reinforcing bars. One end of the anchor cable is fixed to the slope surface (free section), while the other end is anchored in stable rock mass or sliding surface (anchored section). It generates anti-sliding resistance on the sliding surface, increasing anti-sliding frictional resistance and keeping the structural surface under compression. This improves the integrity of the slope rock mass, fundamentally improving its mechanical properties, effectively controlling rock mass displacement, promoting stability, and enhancing slope stability. This achieves the purpose of controlling bedding planes, landslides, and unstable rocks and boulders.

[0004] Anchor cables transfer tension through anchors, which in turn transfer the tension to the rock or soil mass. The anchors convert the prestress of the steel strands into the resistance to sliding of the rock mass. During construction, it is crucial to ensure a tight bond between the anchors and the rock mass to prevent prestress loss.

[0005] In general, anchor cables transmit prestress or pull-out force, while anchorages ensure the precise transfer of force to the structure. According to GB50086-2015 "Technical Specification for Rock and Soil Anchors and Shotcrete Support Engineering," anchorages must meet the following functions: 1. Anchor cable clamping: The steel strand is gripped by components such as clamps and anchor rings to prevent slippage; 2. Distribute stress: Evenly transfer concentrated loads to the anchoring structure (such as concrete piers or rock masses); 3. Corrosion protection and sealing: Some anchors are equipped with protective covers to delay the corrosion of anchor cables.

[0006] Since anchor cables and anchorages are used in harsh environments and are prone to corrosion, it is essential to improve their corrosion resistance.

[0007] Patent CN107794842B discloses a high-performance, durable, and corrosion-resistant cable anchor and its construction method, comprising: an upper end steel wire bundle fixing plate, a middle steel wire bundle fixing plate, an anchor plate, a synthetic fiber bundle, a drying chamber, and an anchor cup; the upper end steel wire bundle fixing plate is provided at the upper port of the anchor cup, and a high-strength steel wire bundle is provided on the lower surface of the upper end steel wire bundle fixing plate; the synthetic fiber bundle is attached to the high-strength steel wire bundle; a drying chamber is provided at the lower end of the synthetic fiber bundle, and the drying chamber is filled with silica gel desiccant; a middle steel wire bundle fixing plate is provided at the junction of the two diameter stages in the middle of the anchor cup; an anchor plate is provided at the lower port of the anchor cup; the upper end steel wire bundle fixing plate, the middle steel wire bundle fixing plate, and the anchor plate all have a ring of evenly distributed anchor holes through which the steel wire bundle can pass, and a hole is provided in the center of the anchor plate. This patented technology utilizes the water-absorbing properties of synthetic fibers to absorb moisture inside the anchor without consuming energy, maintaining the dryness around the high-strength steel wire inside the anchor. Furthermore, by sealing the internal and external spaces, moisture that has entered the anchorage is transferred out and absorbed by a desiccant. This patented technology requires precise monitoring; failure to replace the desiccant in a timely manner will compromise its anti-corrosion effect. Summary of the Invention

[0008] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a corrosion-resistant anchor cable and its manufacturing process.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: A manufacturing process for corrosion-resistant anchor cables and anchorages, comprising the following specific steps: (1) After cleaning the anchor cable and anchorage, a heat-co-diffusion agent is used to obtain alloyed anchor cable and anchorage; (2) The alloyed anchor cable is bombarded by supersonic particles to obtain a pretreated anchor cable; (3) The pretreated anchor cable and anchorage are subjected to nitriding, high-current pulsed electron beam treatment, boronizing treatment and heat treatment to obtain corrosion-resistant anchor cable and anchorage.

[0010] Preferably, in step (1), the cleaning process includes: cleaning the surface of the anchor cable and anchorage of oil, scale and rust.

[0011] Preferably, in step (1), the penetrant is obtained by mixing aluminum powder, zirconium powder, ruthenium powder, alumina, quartz sand and ammonium chloride in a mass ratio of 10:3~4:1~2:20~25:8~10:1~2.

[0012] Preferably, in step (1), the anchor cable is installed into the seepage tank, and seepage agent occupying 2 / 3 to 3 / 4 of the tank volume is filled into the seepage tank. Then the seepage tank is buried in a rotary heating furnace containing quartz sand, and the furnace is covered and sealed for heating and co-seepage.

[0013] Preferably, in step (1), the heating co-percolation is carried out at a temperature of 400-450°C, a rotation speed of 15-25 r / min, and a time of 3-4 h.

[0014] In a further preferred embodiment, after the heating co-percolation is completed, stop heating, continue rotating for 1 to 2 hours, stop rotating, open the furnace door, and allow it to cool naturally to room temperature (25°C) before removing it. Preferably, in step (2), the supersonic particle bombardment includes the following steps: 10-15MPa compressed air is obtained at a supersonic speed of 1000-1200m / s through a Laval nozzle, carrying corundum particles with a particle size of 1-2μm and sprayed onto the surface of the alloyed anchor cable and anchorage, with a spraying time of 70-80s.

[0015] Preferably, in step (3), the nitriding treatment includes the following steps: placing the pretreated anchor cable into a heat treatment furnace, evacuating to below 10 Pa, introducing 50-60 Pa of argon gas, and raising the temperature to 350-360°C. Then, stopping the argon gas supply, turning on the power, and changing to a nitrogen and hydrogen gas with a volume ratio of 3:1, so that the pressure in the heat treatment furnace is 330-360 Pa. The temperature is then raised to 400-420°C, and the nitriding treatment is carried out for 6-8 hours with heat and pressure maintained. Finally, the power is turned off, the residual gas is removed, and argon gas is introduced. The gas is then allowed to cool naturally to room temperature under an argon atmosphere.

[0016] More preferably, the voltage is 800-1000V.

[0017] Preferably, in step (3), the accelerating voltage during the high-current pulsed electron beam treatment is 20-25 kV, the number of pulses is 10, and the energy density is 6 J / cm³. 2 .

[0018] Preferably, in step (3), the boronizing treatment includes the following steps: the pretreated anchor cable and anchor after nitriding and high-current pulsed electron beam treatment are placed in a heat treatment furnace, the vacuum is evacuated to below 10 Pa, the power is turned on, and argon and hydrogen with a volume ratio of 3:1 are introduced to make the pressure in the heat treatment furnace 300-360 Pa, and the temperature is raised to 700-750 °C. The argon and hydrogen are stopped, and diborane is introduced instead to make the pressure in the heat treatment furnace 400-420 Pa. The temperature is further raised to 400-420 °C, and the boronizing treatment is carried out for 6-8 hours with heat and pressure maintained. The power is stopped, the residual gas is removed, argon is introduced, and the cable is naturally cooled to room temperature under the argon atmosphere.

[0019] More preferably, the energizing voltage is 1000-1200V.

[0020] Preferably, in step (3), the heat treatment is performed under a pulsed electric field, wherein the root mean square current density of the pulsed electric field is 3–4 A / mm². 2 The frequency is 300-400Hz, and the duty cycle is 0.4. The heat treatment includes the following steps: first, heating to 500-550℃ at 100-120℃ / min and holding for 2-3 hours; then heating to 750-800℃ at 8-10℃ / min and holding for 3-4 hours; then cooling to 650-700℃ at 50-60℃ / min and holding for 2-3 hours; and finally cooling naturally to room temperature.

[0021] A corrosion-resistant anchor cable is prepared by the aforementioned manufacturing process of a corrosion-resistant anchor cable.

[0022] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a corrosion-resistant anchor cable and its manufacturing process. After cleaning, the anchor cable is subjected to heated co-diffusion with a penetrant to obtain an alloyed anchor cable. The alloyed anchor cable is then bombarded with supersonic particles to obtain a pretreated anchor cable. This pretreated anchor cable undergoes nitriding, high-current pulsed electron beam treatment, boronizing, and heat treatment to obtain the corrosion-resistant anchor cable. This invention significantly improves corrosion resistance, extends service life, and ensures safe use through surface treatment of the anchor cable.

[0023] Anchor cables and anchors are heated and co-infiltrated using an infiltrator containing aluminum powder, zirconium powder, and ruthenium powder to form an alloyed infiltrated layer on the surface of the anchor cables and anchors. The corrosion resistance is improved through the synergistic effect of aluminum, zirconium, ruthenium, etc.

[0024] Bombarding alloyed anchor cables with supersonic particles refines the grains on the surface of the pretreated anchor cables, which is beneficial for subsequent nitriding and boronizing.

[0025] Nitriding and boronizing treatments cause the formation of metal nitrides and borides on the surface of pretreated anchor cables and anchorages, resulting in more comprehensive protection and further improving corrosion resistance.

[0026] Between nitriding and boronizing, a high-current pulsed electron beam treatment was performed, which caused the surface of the anchor cable and anchorage to melt and solidify rapidly, further refining the grains and promoting boronizing. Heat treatment is performed under pulsed electric field conditions to optimize the microstructure and further improve corrosion resistance. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] The anchor cable and anchorage involved in this invention were purchased from Tianjin Ruiheng Prestressed Machinery Co., Ltd. The main body of the anchor cable is prestressed steel strand with a specification of 15.2, and the circular working anchorage is M15-5.

[0029] Example 1 A manufacturing process for corrosion-resistant anchor cables and anchorages, comprising the following specific steps: (1) After cleaning the anchor cable and anchorage, a heat-co-diffusion agent is used to obtain alloyed anchor cable and anchorage; (2) Alloyed anchor cables are bombarded by supersonic particles to obtain pretreated anchor cables; (3) Pre-treated anchor cables and anchors are subjected to nitriding, high-current pulsed electron beam treatment, boronizing treatment, and heat treatment to obtain corrosion-resistant anchor cables and anchors.

[0030] In step (1), the cleaning process includes: cleaning the oil, scale and rust off the surface of the anchor cable and anchor.

[0031] The penetrant is obtained by mixing aluminum powder, zirconium powder, ruthenium powder, alumina, quartz sand, and ammonium chloride in a mass ratio of 10:3:1:20:8:1.

[0032] The anchor cable and anchorage are installed into the seepage tank, and seepage agent is filled into the seepage tank to fill 2 / 3 of the tank's volume. Then, the seepage tank is buried in a rotary heating furnace containing quartz sand, and the furnace is covered and sealed for heating and co-seepage.

[0033] During the co-infiltration process, the temperature was 400℃, the rotation speed was 15 r / min, and the time was 3 h.

[0034] After the heating co-infiltration is complete, stop heating, continue rotating for 1 hour, then stop rotating, open the furnace door, and allow it to cool naturally to room temperature (25℃) before removing it.

[0035] In step (2), the supersonic particle bombardment includes the following steps: 10MPa compressed air is obtained at a supersonic speed of 1000m / s through a Laval nozzle, and corundum particles with a particle size of 1μm are sprayed onto the surface of the alloyed anchor cable and anchorage, with a spraying time of 70s.

[0036] In step (3), the nitriding treatment includes the following steps: The pretreated anchor cable is placed in a heat treatment furnace, evacuated to below 10 Pa, argon gas at 50 Pa is introduced, and the temperature is raised to 350°C. The argon gas supply is stopped, and electricity is switched on. The supply is then changed to a nitrogen and hydrogen gas mixture with a volume ratio of 3:1, making the pressure in the heat treatment furnace 330 Pa. The temperature is further raised to 400°C, and the nitriding treatment is maintained at this temperature and pressure for 6 hours. Electricity is stopped, residual gas is removed, argon gas is introduced, and the mixture is allowed to cool naturally to room temperature under an argon atmosphere. The voltage is 800 V.

[0037] In step (3), during the high-current pulsed electron beam treatment, the accelerating voltage is 20 kV, the number of pulses is 10, and the energy density is 6 J / cm³.2 .

[0038] The boronizing treatment includes the following steps: The pretreated anchor cables and anchorages, after nitriding and high-current pulsed electron beam treatment, are placed in a heat treatment furnace. The furnace is evacuated to below 10 Pa, energized, and argon and hydrogen gas (volume ratio 3:1) are introduced to maintain a pressure of 300 Pa. The temperature is then raised to 700 °C. The argon and hydrogen gas supply is stopped, and diborane is introduced instead, maintaining a pressure of 400 Pa. The temperature is further raised to 400 °C, and the boronizing treatment is carried out under this temperature and pressure for 6 hours. The energization is then stopped, residual gas is removed, and argon gas is introduced. The cables are then allowed to cool naturally to room temperature under an argon atmosphere. The energizing voltage is 1000 V.

[0039] In step (3), the heat treatment is carried out under a pulsed electric field, with a root-mean-square current density of 3 A / mm². 2 , frequency 300Hz, duty cycle 0.4; The heat treatment includes the following steps: first, raise the temperature to 500℃ at 100℃ / min and hold for 2 hours, then raise the temperature to 750℃ at 8℃ / min and hold for 3 hours, then lower the temperature to 650℃ at 50℃ / min and hold for 2 hours, and then allow it to cool naturally to room temperature.

[0040] Example 2 A manufacturing process for corrosion-resistant anchor cables and anchorages, comprising the following specific steps: (1) After cleaning the anchor cable and anchorage, a heat-co-diffusion agent is used to obtain alloyed anchor cable and anchorage; (2) Alloyed anchor cables are bombarded by supersonic particles to obtain pretreated anchor cables; (3) Pre-treated anchor cables and anchors are subjected to nitriding, high-current pulsed electron beam treatment, boronizing treatment, and heat treatment to obtain corrosion-resistant anchor cables and anchors.

[0041] In step (1), the cleaning process includes: cleaning the oil, scale and rust off the surface of the anchor cable and anchor.

[0042] The penetrant is obtained by mixing aluminum powder, zirconium powder, ruthenium powder, alumina, quartz sand, and ammonium chloride in a mass ratio of 10:4:2:25:10:2.

[0043] The anchor cable and anchorage are installed in the seepage tank, and seepage agent is filled into the seepage tank to fill 3 / 4 of the tank's volume. Then, the seepage tank is buried in a rotary heating furnace containing quartz sand, and the furnace is covered and sealed for heating and co-seepage.

[0044] During the co-infiltration process, the temperature was 450℃, the rotation speed was 25 r / min, and the time was 4 h.

[0045] After the heating co-infiltration is complete, stop heating, continue rotating for 2 hours, then stop rotating, open the furnace door, and allow it to cool naturally to room temperature (25℃) before removing it.

[0046] In step (2), the supersonic particle bombardment includes the following steps: 15MPa compressed air is obtained at a supersonic speed of 1200m / s through a Laval nozzle, carrying corundum particles with a particle size of 2μm and sprayed onto the surface of the alloyed anchor cable and anchorage, with a spraying time of 80s.

[0047] In step (3), the nitriding treatment includes the following steps: The pretreated anchor cable is placed in a heat treatment furnace, evacuated to below 10 Pa, 60 Pa of argon gas is introduced, and the temperature is raised to 360°C. The argon gas supply is stopped, and electricity is switched on. The solution is then switched to a nitrogen and hydrogen gas mixture with a volume ratio of 3:1, maintaining the pressure in the heat treatment furnace at 360 Pa. The temperature is further raised to 420°C, and the nitriding treatment is carried out under heat and pressure for 8 hours. Electricity is stopped, residual gas is removed, and argon gas is introduced. The solution is then allowed to cool naturally to room temperature under an argon atmosphere. The voltage is 1000V.

[0048] In step (3), during the high-current pulsed electron beam treatment, the accelerating voltage is 25 kV, the number of pulses is 10, and the energy density is 6 J / cm³. 2 .

[0049] The boronizing treatment includes the following steps: The pretreated anchor cables and anchorages, after nitriding and high-current pulsed electron beam treatment, are placed in a heat treatment furnace. The furnace is evacuated to below 10 Pa, then energized, and argon and hydrogen gas (volume ratio 3:1) are introduced to maintain a pressure of 360 Pa. The temperature is then raised to 750°C. The argon and hydrogen gas supply is stopped, and diborane is introduced instead, maintaining a pressure of 420 Pa. The temperature is further raised to 420°C, and the boronizing treatment is carried out under this temperature and pressure for 8 hours. The energization is then stopped, residual gas is removed, and argon gas is introduced. The cables are then allowed to cool naturally to room temperature under an argon atmosphere. The energizing voltage is 1200V.

[0050] In step (3), the heat treatment is carried out under a pulsed electric field, with a root-mean-square current density of 4 A / mm². 2 , frequency 400Hz, duty cycle 0.4; The heat treatment includes the following steps: first, raise the temperature to 550℃ at 120℃ / min and hold for 3 hours, then raise the temperature to 800℃ at 10℃ / min and hold for 4 hours, then lower the temperature to 700℃ at 60℃ / min and hold for 3 hours, and then allow it to cool naturally to room temperature.

[0051] Example 3 A manufacturing process for corrosion-resistant anchor cables and anchorages, comprising the following specific steps: (1) After cleaning the anchor cable and anchorage, a heat-co-diffusion agent is used to obtain alloyed anchor cable and anchorage; (2) Alloyed anchor cables are bombarded by supersonic particles to obtain pretreated anchor cables; (3) Pre-treated anchor cables and anchors are subjected to nitriding, high-current pulsed electron beam treatment, boronizing treatment, and heat treatment to obtain corrosion-resistant anchor cables and anchors.

[0052] In step (1), the cleaning process includes: cleaning the oil, scale and rust off the surface of the anchor cable and anchor.

[0053] The penetrant is prepared by mixing aluminum powder, zirconium powder, ruthenium powder, alumina, quartz sand, and ammonium chloride in a mass ratio of 10:3.5:1.5:22:9:1.5.

[0054] The anchor cable and anchorage are installed in the seepage tank, and seepage agent is filled into the seepage tank to fill 3 / 4 of the tank's volume. Then, the seepage tank is buried in a rotary heating furnace containing quartz sand, and the furnace is covered and sealed for heating and co-seepage.

[0055] During the co-infiltration process, the temperature was 420℃, the rotation speed was 20 r / min, and the time was 3 h.

[0056] After the heating co-infiltration is complete, stop heating, continue rotating for 2 hours, then stop rotating, open the furnace door, and allow it to cool naturally to room temperature (25℃) before removing it. In step (2), the supersonic particle bombardment includes the following steps: 12MPa compressed air is obtained at a supersonic speed of 1100m / s through a Laval nozzle, and corundum particles with a particle size of 1μm are sprayed onto the surface of the alloyed anchor cable and anchorage, with a spraying time of 75s.

[0057] In step (3), the nitriding treatment includes the following steps: The pretreated anchor cable is placed in a heat treatment furnace, evacuated to below 10 Pa, argon gas at 55 Pa is introduced, and the temperature is raised to 360°C. The argon gas supply is stopped, and electricity is switched on. The supply is then changed to a nitrogen and hydrogen gas mixture with a volume ratio of 3:1, making the pressure in the heat treatment furnace 350 Pa. The temperature is further raised to 410°C, and the nitriding treatment is maintained at this temperature and pressure for 7 hours. Electricity is stopped, residual gas is removed, argon gas is introduced, and the mixture is allowed to cool naturally to room temperature under an argon atmosphere. The voltage is 900 V.

[0058] In step (3), during the high-current pulsed electron beam treatment, the accelerating voltage is 22 kV, the number of pulses is 10, and the energy density is 6 J / cm³. 2 .

[0059] The boronizing treatment includes the following steps: The pretreated anchor cables and anchorages, after nitriding and high-current pulsed electron beam treatment, are placed in a heat treatment furnace. The furnace is evacuated to below 10 Pa, energized, and argon and hydrogen gas (volume ratio 3:1) are introduced to maintain a pressure of 320 Pa. The temperature is then raised to 720°C. The argon and hydrogen gas supply is stopped, and diborane is introduced instead, maintaining a pressure of 410 Pa. The temperature is further raised to 410°C, and the boronizing treatment is carried out under this temperature and pressure for 7 hours. The energization is then stopped, residual gas is removed, and argon gas is introduced. The cables are then allowed to cool naturally to room temperature under an argon atmosphere. The energizing voltage is 1100V.

[0060] In step (3), the heat treatment is carried out under a pulsed electric field, with a root-mean-square current density of 4 A / mm². 2 , frequency 400Hz, duty cycle 0.4; The heat treatment includes the following steps: first, raise the temperature to 520℃ at 110℃ / min and hold for 2 hours, then raise the temperature to 780℃ at 9℃ / min and hold for 3 hours, then lower the temperature to 680℃ at 55℃ / min and hold for 2 hours, and then allow it to cool naturally to room temperature.

[0061] Comparative Example 1 Zirconium powder is omitted from the infiltration agent used in the preparation of alloyed anchor cables and anchorages; The rest is the same as in Example 1.

[0062] Comparative Example 2 Supersonic particle bombardment is omitted; The rest is the same as in Example 1.

[0063] Comparative Example 3 Nitriding treatment is omitted; The rest is the same as in Example 1.

[0064] Comparative Example 4 High-current pulsed electron beam processing is omitted; The rest is the same as in Example 1.

[0065] Comparative Example 5 Boronizing treatment is omitted; The rest is the same as in Example 1.

[0066] Comparative Example 6 The pulse electric field is omitted. The rest is the same as in Example 1.

[0067] Corrosion resistance tests were conducted on the corrosion-resistant anchor cables and anchorages obtained in Examples 1-3 and Comparative Examples 1-6, respectively, with the anchor cables and anchorages before treatment serving as a control group. Specifically, the tests included neutral salt spray (5% sodium chloride solution by mass), acid corrosion, and alkali corrosion.

[0068] The neutral salt spray conditions are: temperature 35℃, humidity 95%RH, and mist drop rate 2mL / (h·cm). 2 The time it takes for corrosion spots to appear on the surface of the anchor cable and anchorage is recorded as the salt spray resistance time. The acid corrosion conditions are as follows: the anchor cable and anchorage are completely immersed in a 50% sulfuric acid solution. The corrosion of the anchor cable and anchorage surface is observed every 5 hours. The time when corrosion spots appear on the anchor cable and anchorage surface is recorded as the acid resistance time. The alkaline corrosion conditions are as follows: the anchor cable and anchorage are completely immersed in a 30% sodium hydroxide solution. The corrosion of the anchor cable and anchorage surface is observed every 5 hours. The time when corrosion spots appear on the anchor cable and anchorage surface is recorded as the alkali resistance time.

[0069] The test results are shown in Table 1.

[0070] Table 1. Corrosion resistance test

[0071] As shown in Table 1, the anchor cables and anchorages obtained in Examples 1 to 3 have excellent corrosion resistance.

[0072] In Comparative Example 1, zirconium powder was omitted from the carburizing agent used in the preparation of alloyed anchor cables and anchorages; in Comparative Example 2, supersonic particle bombardment was omitted; in Comparative Example 3, nitriding treatment was omitted; in Comparative Example 4, high-current pulsed electron beam treatment was omitted; in Comparative Example 5, boronizing treatment was omitted; and in Comparative Example 6, pulsed electric field treatment was omitted. The corrosion resistance of these examples was significantly worse. This indicates that the specific composition of the carburizing agent used in alloyed anchor cables and anchorages, as well as the interconnected steps of supersonic particle bombardment, nitriding treatment, high-current pulsed electron beam treatment, boronizing treatment, and heat treatment under pulsed electric field conditions, promote the improvement of the corrosion resistance of anchor cables and anchorages.

[0073] The present invention has been illustrated through the above embodiments, but the present invention is not limited to the above embodiments, that is, it does not mean that the present invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions of individual raw materials in the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A manufacturing process for corrosion-resistant anchor cables and anchorages, characterized in that, The specific steps are as follows: (1) After cleaning the anchor cable and anchorage, a heat-co-diffusion agent is used to obtain alloyed anchor cable and anchorage; (2) The alloyed anchor cable is bombarded by supersonic particles to obtain a pretreated anchor cable; (3) The pretreated anchor cable and anchorage are subjected to nitriding, high-current pulsed electron beam treatment, boronizing treatment and heat treatment to obtain corrosion-resistant anchor cable and anchorage.

2. The manufacturing process of a corrosion-resistant anchor cable according to claim 1, characterized in that, In step (1), the infiltrator is obtained by mixing aluminum powder, zirconium powder, ruthenium powder, alumina, quartz sand and ammonium chloride in a mass ratio of 10:3~4:1~2:20~25:8~10:1~2.

3. The manufacturing process of a corrosion-resistant anchor cable according to claim 1, characterized in that, In step (1), the heating co-infiltration includes the following steps: the anchor cable and anchorage are installed into the infiltration tank, the infiltration agent is filled into the infiltration tank to occupy 2 / 3 to 3 / 4 of the volume of the infiltration tank, the infiltration tank is buried in a rotary heating furnace containing quartz sand, and the furnace is covered and sealed for heating co-infiltration.

4. The manufacturing process of a corrosion-resistant anchor cable according to claim 1, characterized in that, In step (1), the temperature during the heating co-percolation is 400-450℃, the rotation speed is 15-25r / min, and the time is 3-4h.

5. The manufacturing process of a corrosion-resistant anchor cable according to claim 1, characterized in that, In step (2), the supersonic particle bombardment includes the following steps: 10-15MPa compressed air is obtained at a supersonic speed of 1000-1200m / s through a Laval nozzle, and corundum particles with a particle size of 1-2μm are sprayed onto the surface of the alloyed anchor cable and anchorage, with a spraying time of 70-80s.

6. The manufacturing process of a corrosion-resistant anchor cable according to claim 1, characterized in that, In step (3), the nitriding treatment includes the following steps: placing the pretreated anchor cable into a heat treatment furnace, evacuating to below 10 Pa, introducing 50-60 Pa of argon gas, and raising the temperature to 350-360°C. Then, stopping the argon gas supply, turning on the power, and switching to a nitrogen and hydrogen gas with a volume ratio of 3:1 to make the pressure in the heat treatment furnace 330-360 Pa. The temperature is then raised to 400-420°C, and the nitriding treatment is carried out under heat and pressure for 6-8 hours. Finally, the power is turned off, the residual gas is removed, and argon gas is introduced. The material is then allowed to cool naturally to room temperature under an argon atmosphere.

7. The manufacturing process of a corrosion-resistant anchor cable according to claim 1, characterized in that, In step (3), the high-current pulsed electron beam treatment uses an accelerating voltage of 20–25 kV, 10 pulses, and an energy density of 6 J / cm³. 2 .

8. The manufacturing process of a corrosion-resistant anchor cable according to claim 1, characterized in that, In step (3), the boronizing treatment includes the following steps: the pretreated anchor cable and anchorage after nitriding and high-current pulsed electron beam treatment are placed in a heat treatment furnace, the vacuum is evacuated to below 10 Pa, the power is turned on, and argon and hydrogen gas with a volume ratio of 3:1 are introduced to make the pressure in the heat treatment furnace 300-360 Pa, and the temperature is raised to 700-750 °C. The argon and hydrogen gas are stopped, and diborane is introduced instead to make the pressure in the heat treatment furnace 400-420 Pa. The temperature is further raised to 400-420 °C, and the boronizing treatment is carried out under heat and pressure for 6-8 hours. The power is stopped, the residual gas is removed, argon gas is introduced, and the cable is naturally cooled to room temperature under an argon atmosphere.

9. The manufacturing process of a corrosion-resistant anchor cable according to claim 1, characterized in that, In step (3), the heat treatment is performed under a pulsed electric field, wherein the root mean square current density of the pulsed electric field is 3–4 A / mm². 2 The frequency of the pulsed electric field is 300-400Hz, and the duty cycle of the pulsed electric field is 0.

4. The heat treatment includes the following steps: first, heating to 500-550℃ at 100-120℃ / min and holding for 2-3 hours; then heating to 750-800℃ at 8-10℃ / min and holding for 3-4 hours; then cooling to 650-700℃ at 50-60℃ / min and holding for 2-3 hours; and finally cooling naturally to room temperature.

10. A corrosion-resistant anchor cable, characterized in that, It is prepared by the manufacturing process of any one of claims 1 to 9 for a corrosion-resistant anchor cable.

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