Corrosion-resistant alloy grounding material suitable for saline alkali soil and preparation method of corrosion-resistant alloy grounding material

Abstract

The invention discloses a corrosion-resistant alloy grounding material suitable for saline alkali soil and a preparation method thereof, and relates to the field of grounding materials.The preparation method comprises the following steps that S1, the surface of an alloy matrix is subjected to surface treatment, a layer of oxide is attached to the surface of the alloy matrix, and a first alloy material is obtained; s2, the first alloy material is soaked in a silane coupling agent, meanwhile, the repairing micro-capsules are added, and the first alloy material is taken out; a second alloy material is obtained; s3, the second alloy material is coated with a hydrophobic solution, a hydrophobic film is formed, and a third alloy material is obtained; and S4, continuously coating the surface of the third alloy material with a layer of slow-release particles capable of improving the saline-alkali soil, thereby obtaining the saline-alkali soil conditioner. By means of the multi-layer structure, the corrosion resistance of the alloy material on saline-alkali soil can be effectively improved, and therefore the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The application relates to the field of grounding materials, in particular to a corrosion-resistant alloy grounding material suitable for saline-alkali soil and a preparation method thereof. BACKGROUND

[0002] A power transmission line is the skeleton and trunk of the entire power system, and supports the operation of the entire power system, therefore, selecting appropriate grounding materials and installing and maintaining according to specifications are important measures to ensure the normal operation and safety of the power system. Especially in the saline-alkali soil environment, the grounding material faces serious corrosion problems, which affects the stability and service life of the grounding system. Therefore, it is urgent to develop a corrosion-resistant alloy grounding material suitable for saline-alkali soil. SUMMARY

[0003] The application aims to at least solve one of the technical problems in the prior art, and provides a corrosion-resistant alloy grounding material suitable for saline-alkali soil and a preparation method thereof.

[0004] The technical solution of the application is as follows:

[0005] A preparation method of a corrosion-resistant alloy grounding material suitable for saline-alkali soil, comprising the following steps:

[0006] S1: surface treatment is performed on the surface of the alloy substrate, so that an oxide layer is attached to the surface of the alloy substrate, and a first alloy material is obtained;

[0007] S2: the first alloy material is immersed in a silane coupling agent, and a repairing microcapsule is added at the same time, and then the first alloy material is taken out, so that a second alloy material is obtained;

[0008] S3: the second alloy material is coated with a hydrophobic solution to form a hydrophobic film, so that a third alloy material is obtained;

[0009] S4: a layer of slow-release particles capable of improving saline-alkali soil is coated on the surface of the third alloy material, and the corrosion-resistant alloy grounding material suitable for saline-alkali soil is prepared.

[0010] Preferably, in step S1, the surface treatment is anodic oxidation of the alloy substrate, and the specific conditions are as follows: the electrolyte is 150-190g / L sulfuric acid, the temperature is 15-20 DEG C, the current density is 1.2-1.8A / dm 2 , the oxidation time is 30-60min, the voltage is 20-25V, and the film thickness is 3-5um.

[0011] Preferably, the preparation method of the repairing microcapsule is as follows: hexamethyl diisocyanate is dissolved in cyclohexanone, and after 0.5-2 hours of reaction, ethylene glycol is added at a speed of 3-5 mg / s, and the reaction lasts for 30-40 hours; the reaction mixture is distilled, and the excess cyclohexanone, water and hexamethyl diisocyanate are distilled out, and the remaining light yellow and viscous pre-polymer is obtained; the pre-polymer is dissolved in chlorobenzene, a mixed solution of urea and formaldehyde is added, and the pre-polymer is stirred and heated until it is completely dissolved; hexamethyl diisocyanate, ethyl acetate and cyclohexane are mixed uniformly, emulsified, and dried to obtain the self-repairing microcapsule.

[0012] Preferably, the adding amount of the repairing microcapsule accounts for 3-10% of the mass of the first alloy material.

[0013] Preferably, in the step S3, the hydrophobic solution comprises a polytetrafluoroethylene solution containing nano-silicon dioxide.

[0014] Preferably, in the step S4, the preparation method of the slow-release particle is as follows:

[0015] The porous material is immersed in a buffer solution, taken out and dried to obtain the slow-release particle.

[0016] Preferably, the buffer solution is a mixed solution of sodium carbonate and sodium bicarbonate.

[0017] Preferably, the slow-release particle accounts for 5-15% of the mass of the third alloy material.

[0018] The application further discloses a corrosion-resistant alloy grounding material suitable for saline-alkali soil, which is prepared by the preparation method.

[0019] The application has the following beneficial effects:

[0020] The saline-alkali soil is alkaline as a whole because the alkali content in the soil is higher than the normal level, and the pH is usually higher than 8.2, belonging to the category of strong alkaline soil.

[0021] The alloy material provided by the application comprises an alloy base body, an oxide layer, a repairing layer, a hydrophobic layer and a modified layer arranged from inside to outside on the surface of the alloy base body.

[0022] Combined with the characteristics of saline-alkali soil, through the structure arranged in sequence, the soil properties are adjusted through the improvement layer, the concentration of corrosive substances is reduced, and the hydrophobic film is further arranged to reduce the adhesion of corrosive solution in the soil on the alloy material. In addition, after long-term use, if the hydrophobic film has corrosion points, the hydrophobic film can be repaired through the repair microcapsule to improve the corrosion resistance. Finally, the silane coupling agent improves the bonding force between the hydrophobic film and the oxide layer of the alloy matrix, reduces the possibility of peeling, and the arrangement of the oxide layer can further play a role in corrosion resistance of the matrix alloy. Therefore, the multilayer structure arranged in the application can effectively improve the corrosion resistance of the alloy material in the saline-alkali soil, thereby prolonging the service life. DETAILED DESCRIPTION

[0023] The embodiments of the present application will be described in detail below. The embodiments described below are exemplary and are only used to explain the present application and cannot be understood as a limitation of the present application. If the specific technology or condition is not specified in the embodiments, the technology or condition described in the literature in the art or according to the product instruction is used. If the reagent or instrument used is not specified by the manufacturer, it is a conventional product that can be obtained by purchase.

[0024] The following test alloy matrix uses Cu-9Al, i.e. containing 9wt% Al.

[0025] Example 1

[0026] A preparation method of a corrosion-resistant alloy grounding material suitable for saline-alkali soil, comprising the following steps:

[0027] S1: surface treatment is performed on the surface of the alloy matrix to make the surface adhere to an oxide layer, to obtain a first alloy material;

[0028] S2: the first alloy material is immersed in a silane coupling agent, and a repair microcapsule is added at the same time, and then taken out, to obtain a second alloy material;

[0029] S3: the second alloy material is coated with a hydrophobic solution to form a hydrophobic film, to obtain a third alloy material;

[0030] S4: a layer of slow-release particles containing a material capable of improving saline-alkali soil is further coated on the surface of the third alloy material.

[0031] In step S1, the surface treatment is specifically: the alloy matrix is anodized, and the specific conditions are: the electrolyte is sulfuric acid 180g / L, the temperature is 17℃, the current density is 1.8A / dm 2 , the oxidation time is 40min, the voltage is 20V, and the film thickness is 5μm.

[0032] The preparation method of the repair microcapsule is as follows: 25g hexamethyl diisocyanate is dissolved in 50g cyclohexanone, 4g ethylene glycol is added at a speed of 4mg / s after 1h of reaction, and the reaction continues for 40h; the reaction mixture is distilled, and the excess cyclohexanone, water and hexamethyl diisocyanate are distilled out, leaving a light yellow, viscous pre-polymer; 50g of the pre-polymer is dissolved in chlorobenzene, 1g of urea and 3g of a mixed solution of formaldehyde are added, and the pre-polymer is stirred until it is completely dissolved; 20g of hexamethyl diisocyanate, 5g of ethyl phenyl acetate and 6g of cyclohexane are mixed uniformly, emulsified at a speed of 30000r / min for 15min, and then dried to obtain the self-repairing microcapsule.

[0033] The amount of the repair microcapsule accounts for 8% of the mass of the first alloy material.

[0034] In step S3, the hydrophobic solution includes a polytetrafluoroethylene solution containing 7wt% nanosilica.

[0035] In step S4, the preparation method of the slow-release particle is as follows:

[0036] The porous material is immersed in a buffer solution, taken out and dried to obtain the slow-release particle.

[0037] The buffer solution is a mixture of sodium carbonate and sodium bicarbonate with a mass ratio of 1:1.

[0038] The slow-release particle accounts for 8% of the mass of the third alloy material.

[0039] Example 2

[0040] A preparation method of a corrosion-resistant alloy grounding material suitable for saline-alkali soil includes the following steps:

[0041] S1: The surface of the alloy substrate is treated to adhere an oxide layer to the surface, obtaining a first alloy material;

[0042] S2: The first alloy material is immersed in a silane coupling agent, and repair microcapsules are added at the same time, and then taken out to obtain a second alloy material;

[0043] S3: The second alloy material is coated with a hydrophobic solution to form a hydrophobic film, obtaining a third alloy material;

[0044] S4: A layer of slow-release particles containing components capable of improving saline-alkali soil is coated on the surface of the third alloy material to obtain the corrosion-resistant alloy grounding material suitable for saline-alkali soil.

[0045] In step S1, the surface treatment is as follows: the alloy substrate is anodized, and the specific conditions are as follows: the electrolyte is sulfuric acid 180g / L, the temperature is 17℃, the current density is 1.8A / dm 2 , the oxidation time is 40min, the voltage is 25V, and the film thickness is 4μm.

[0046] The preparation method of the repair microcapsule is as follows: 25g hexamethyl diisocyanate is dissolved in 50g cyclohexanone, 4g ethylene glycol is added at a speed of 4mg / s after 1h of reaction, and the reaction continues for 40h; the reaction mixture is distilled, and the excess cyclohexanone, water, and hexamethyl diisocyanate are distilled out, leaving a light yellow, viscous pre-polymer; 50g of the pre-polymer is dissolved in chlorobenzene, 1g of urea and 3g of a mixed solution of formaldehyde are added, and the pre-polymer is stirred until it is completely dissolved; 20g of hexamethyl diisocyanate, 5g of ethyl phenyl acetate, and 6g of cyclohexane are mixed uniformly, emulsified at a speed of 30000r / min for 15min, and then dried to obtain the self-repairing microcapsule.

[0047] The amount of the repair microcapsule added accounts for 5% of the mass of the first alloy material.

[0048] In step S3, the hydrophobic solution includes a polytetrafluoroethylene solution containing 6wt% nanosilica.

[0049] In step S4, the preparation method of the slow-release particle is as follows:

[0050] The porous material is immersed in a buffer solution, taken out, and dried to obtain.

[0051] The buffer solution is a mixed solution of sodium carbonate and sodium bicarbonate.

[0052] The slow-release particle accounts for 10% of the mass of the third alloy material.

[0053] Example 3

[0054] A preparation method of a corrosion-resistant alloy grounding material suitable for saline-alkali soil includes the following steps:

[0055] S1: The surface of the alloy substrate is treated to adhere an oxide layer to the surface, obtaining a first alloy material;

[0056] S2: The first alloy material is immersed in a silane coupling agent, and repair microcapsules are added at the same time, and then taken out to obtain a second alloy material;

[0057] S3: The second alloy material is coated with a hydrophobic solution to form a hydrophobic film, obtaining a third alloy material;

[0058] S4: A layer of slow-release particles containing components capable of improving saline-alkali soil is coated on the surface of the third alloy material to obtain.

[0059] In step S1, the surface treatment is as follows: the alloy substrate is anodized, and the specific conditions are as follows: the electrolyte is sulfuric acid 180g / L, the temperature is 17℃, the current density is 1.8A / dm 2 , the oxidation time is 40min, the voltage is 20V, and the film thickness is 5μm.

[0060] The preparation method of the repair microcapsule is as follows: 25g hexamethyl diisocyanate is dissolved in 50g cyclohexanone, 4g ethylene glycol is added at a speed of 4mg / s after 1h of reaction, and the reaction continues for 40h; the reaction mixture is distilled, and the excess cyclohexanone, water, and hexamethyl diisocyanate are distilled out, leaving a light yellow, viscous pre-polymer; 50g of the pre-polymer is dissolved in chlorobenzene, 1g of urea and 3g of a mixed solution of formaldehyde are added, and the pre-polymer is stirred and heated until it is completely dissolved, 20g of hexamethyl diisocyanate, 5g of ethyl phenyl acetate, and 6g of cyclohexane are mixed uniformly, emulsified at a speed of 30000r / min for 15min, and then dried to obtain the self-repairing microcapsule.

[0061] The amount of the repair microcapsule accounts for 5% of the mass of the first alloy material.

[0062] In step S3, the hydrophobic solution includes a polytetrafluoroethylene solution containing 5wt% of nano-silicon dioxide.

[0063] In step S4, the preparation method of the slow-release particle is as follows:

[0064] The porous material is immersed in a buffer solution, taken out, and dried to obtain the slow-release particle.

[0065] The buffer solution is a mixture of sodium carbonate and sodium bicarbonate with a mass ratio of 1:1.

[0066] The slow-release particle accounts for 6% of the mass of the third alloy material.

[0067] Example 4

[0068] A preparation method of a corrosion-resistant alloy grounding material suitable for saline-alkali soil includes the following steps:

[0069] S1: The surface of the alloy substrate is treated to adhere an oxide layer to the surface, obtaining a first alloy material;

[0070] S2: The first alloy material is immersed in a silane coupling agent, and repair microcapsules are added at the same time, and then taken out to obtain a second alloy material;

[0071] S3: The second alloy material is coated with a hydrophobic solution to form a hydrophobic film, obtaining a third alloy material;

[0072] S4: A layer of slow-release particles containing components capable of improving saline-alkali soil is coated on the surface of the third alloy material to obtain the corrosion-resistant alloy grounding material suitable for saline-alkali soil.

[0073] In step S1, the surface treatment is as follows: the alloy substrate is anodized, and the specific conditions are as follows: the electrolyte is sulfuric acid 180g / L, the temperature is 17℃, the current density is 1.8A / dm 2The oxidation time is 40 min, the voltage is 20 V, and the film thickness is 4 μm.

[0074] The preparation method of the repair microcapsule is as follows: 25 g of hexamethyl diisocyanate is dissolved in 50 g of cyclohexanone, 4 g of ethylene glycol is added at a speed of 4 mg / s after 1 h of reaction, and the reaction continues for 40 h; the reaction mixture is distilled, and the excess cyclohexanone, water, and hexamethyl diisocyanate are distilled out, leaving a light yellow, viscous pre-polymer; 50 g of the pre-polymer is dissolved in chlorobenzene, 1 g of urea and 3 g of a mixed solution of formaldehyde are added, and the pre-polymer is stirred and heated until it is completely dissolved; 20 g of hexamethyl diisocyanate, 5 g of ethyl phenyl acetate, and 6 g of cyclohexane are mixed uniformly, emulsified at a speed of 30,000 r / min for 15 min, and then dried to obtain the self-repairing microcapsule.

[0075] The amount of the repair microcapsule accounts for 6% of the mass of the first alloy material.

[0076] In step S3, the hydrophobic solution includes a polytetrafluoroethylene solution containing 5 wt% of nano-silicon dioxide.

[0077] In step S4, the preparation method of the slow-release particle is as follows:

[0078] The porous material is immersed in a buffer solution, taken out, and dried to obtain.

[0079] The buffer solution is a mixture of sodium carbonate and sodium bicarbonate with a mass ratio of 1:1.

[0080] The slow-release particle accounts for 12% of the mass of the third alloy material.

[0081] Example 5

[0082] A preparation method of a corrosion-resistant alloy grounding material suitable for saline-alkali soil includes the following steps:

[0083] S1: The surface of the alloy substrate is treated to adhere an oxide layer to the surface, obtaining a first alloy material;

[0084] S2: The first alloy material is immersed in a silane coupling agent, and repair microcapsules are added at the same time, and then taken out to obtain a second alloy material;

[0085] S3: The second alloy material is coated with a hydrophobic solution to form a hydrophobic film, obtaining a third alloy material;

[0086] S4: A layer of slow-release particles containing components capable of improving saline-alkali soil is coated on the surface of the third alloy material to obtain.

[0087] In step S1, the surface treatment is specifically anodic oxidation of the alloy substrate, and the specific conditions are as follows: the electrolyte is sulfuric acid 180 g / L, the temperature is 17℃, the current density is 1.8 A / dm 2 , the oxidation time is 40 min, the voltage is 20 V, and the film thickness is 5 μm.

[0088] The preparation method of the repair microcapsule is as follows: 25 g of hexamethyl diisocyanate is dissolved in 50 g of cyclohexanone, 4 g of ethylene glycol is added at a speed of 4 mg / s after 1 h of reaction, and the reaction continues for 40 h; the reaction mixture is distilled, and the excess cyclohexanone, water, and hexamethyl diisocyanate are distilled out, leaving a light yellow, viscous pre-polymer; 50 g of the pre-polymer is dissolved in chlorobenzene, 1 g of urea and 3 g of a mixed solution of formaldehyde are added, and the pre-polymer is stirred and heated until it is completely dissolved; 20 g of hexamethyl diisocyanate, 5 g of ethyl phenyl acetate, and 6 g of cyclohexane are mixed uniformly, emulsified at a speed of 30000 r / min for 15 min, and then dried to obtain the self-repairing microcapsule.

[0089] The amount of the repair microcapsule added accounts for 8% of the mass of the first alloy material.

[0090] In step S3, the hydrophobic solution includes a polytetrafluoroethylene solution containing 5 wt% of nano-silicon dioxide.

[0091] In step S4, the preparation method of the slow-release particle is as follows:

[0092] The porous material (activated carbon) is immersed in the buffer solution, taken out, and dried to obtain the slow-release particle.

[0093] The buffer solution is a mixed solution of sodium carbonate and sodium bicarbonate with a mass ratio of 1:1.

[0094] The amount of the slow-release particle accounts for 8% of the mass of the third alloy material.

[0095] Comparative Example 1

[0096] Different from Example 1, no slow-release particle is added.

[0097] Comparative Example 2

[0098] Different from Example 1, no repair microcapsule is added.

[0099] The above examples and comparative examples are subjected to the following tests.

[0100] The grounding materials of the examples and comparative examples are made into 12 m grounding bodies, and then a grounding trench with a width of 0.7 m, a depth of 0.6 m, and a length of 14 m is dug, the prepared grounding bodies are placed in the grounding trench, and then uniform saline-alkali soil (pH = 8.2) is backfilled and compacted, and after standing for 12 days, the corrosion rate is tested.

[0101] The test results are shown in Table 1.

[0102] Table 1 Performance test results of examples and comparative examples

[0103] Specimen Corrosion rate (mm / a) Example 1 0.0021 Example 2 0.0023 Example 3 0.0025 Example 4 0.0022 Example 5 0.0022 Comparative Example 1 0.0085 Comparative Example 2 0.0079

[0104] From Table 1, it can be seen that the corrosion resistance of the examples is higher than that of the comparative examples, and the main reasons may be as follows: the examples adjust the soil properties through the modified layer to reduce the concentration of corrosive substances, and further combine the hydrophobic membrane to reduce the adhesion of the corrosion solution in the soil on the alloy material. In addition, after long-term use, if the hydrophobic membrane has corrosion points, the hydrophobic membrane can be repaired by repairing microcapsules to improve the corrosion resistance. Finally, the silane coupling agent improves the adhesion of the hydrophobic membrane and the oxide layer of the alloy substrate, reduces the possibility of peeling, and the setting of the oxide layer can further play a role in corrosion resistance of the substrate alloy. Therefore, the multi-layer structure set by the present application can effectively improve the corrosion resistance of the alloy material in saline-alkali soil, thereby prolonging the service life.

[0105] The above-described examples only express the preferred embodiments of the present application, which are described in detail, but should not be construed as limiting the scope of the patent of the present application. It should be noted that for ordinary skilled persons in the art, other various corresponding changes and deformations can be made according to the above-described technical solutions and concepts, and all these changes and deformations should belong to the protection scope of the claims of the present application.

Claims

1. A method for preparing a corrosion-resistant alloy grounding material suitable for saline-alkali soil, characterized in that, Includes the following steps: S1: The surface of the alloy matrix is ​​surface-treated to attach a layer of oxide to the surface, thus obtaining the first alloy material; S2: The first alloy material is immersed in a silane coupling agent, and repair microcapsules are added at the same time. The material is then removed to obtain the second alloy material. S3: Coat the second alloy material with a hydrophobic water solution to form a hydrophobic film, thereby obtaining the third alloy material; S4: Continue to coat the surface of the third alloy material with a layer of slow-release particles that can improve saline-alkali soil, and obtain the desired product.

2. The method for preparing a corrosion-resistant alloy grounding material suitable for saline-alkali soil according to claim 1, characterized in that, In step S1, the surface treatment specifically involves anodizing the alloy substrate under the following conditions: 150-190 g / L sulfuric acid as the electrolyte, 15-20°C at a temperature of 15-20°C, and a current density of 1.2-1.8 A / dm³. 2 The oxidation time is 30-60 min, the voltage is 20-25 V, and the film thickness is 3-5 μm.

3. The method for preparing a corrosion-resistant alloy grounding material suitable for saline-alkali soil according to claim 1, characterized in that, The preparation method of the repair microcapsules is as follows: Hexamethyl diisocyanate is dissolved in cyclohexanone, and after reacting for 0.5-2 hours, ethylene glycol is added at a rate of 3-5 mg / s, and the reaction continues for 30-40 hours; the reaction mixture is distilled, and excess cyclohexanone, water, and hexamethyl diisocyanate are distilled off, leaving a light yellow, viscous prepolymer; the prepolymer is dissolved in chlorobenzene, and a mixed solution of urea and formaldehyde is added, and the mixture is heated and stirred until the prepolymer is completely dissolved; hexamethyl diisocyanate, ethyl phenyl acetate, and cyclohexane are added and mixed evenly, emulsified, and then dried to obtain self-healing microcapsules.

4. The method for preparing a corrosion-resistant alloy grounding material suitable for saline-alkali soil according to claim 1, characterized in that, The amount of repair microcapsules added accounts for 3-10% of the mass of the first alloy material.

5. The method for preparing a corrosion-resistant alloy grounding material suitable for saline-alkali soil according to claim 1, characterized in that, In step S3, the hydrophobic aqueous solution includes a polytetrafluoroethylene solution containing nano-silica.

6. The method for preparing a corrosion-resistant alloy grounding material suitable for saline-alkali soil according to claim 1, characterized in that, In step S4, the method for preparing the sustained-release particles is as follows: The porous material is immersed in a buffer solution, removed, and dried to obtain the product.

7. The method for preparing a corrosion-resistant alloy grounding material suitable for saline-alkali soil according to claim 6, characterized in that, The buffer solution is a mixture of sodium carbonate and sodium bicarbonate.

8. The method for preparing a corrosion-resistant alloy grounding material suitable for saline-alkali soil according to claim 1, characterized in that, The slow-release particles account for 5-15% of the mass of the third alloy material.

9. A corrosion-resistant alloy grounding material suitable for saline-alkali soils, characterized in that, It is prepared by any one of the preparation methods described in claims 1-8.