Alloy composite grounding material suitable for acid red soil and preparation method thereof
By preparing alloy composite grounding materials, the problem of easy corrosion of grounding materials in acidic red soil environment has been solved, and grounding materials with high corrosion resistance and long service life have been achieved, meeting the requirements of maintenance-free operation.
Patent Information
- Application Number
- CN202511147395.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-15
- Publication Date
- 2025-11-21
AI Technical Summary
Existing grounding materials are prone to corrosion in acidic red soil environments, leading to increased grounding resistance, impact on electrical performance, and shortened device lifespan. Existing anti-corrosion methods cannot meet the long-term maintenance-free requirements.
The preparation method of alloy composite grounding material includes melting, coating, drawing and annealing of alloy raw materials, adding elements such as nickel, aluminum, molybdenum and niobium, and doping flake graphite and carbon fiber between the alloy layer and the core material. Gradient rate cooling is used to form an amorphous structure.
It improves the material's acid and corrosion resistance, reduces anodic activity, enhances strength and creep resistance, extends the service life of the grounding device, and reduces maintenance and replacement costs.
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of grounding materials, in particular to an alloy composite grounding material suitable for acid red soil and a preparation method thereof. BACKGROUND
[0002] As a typical soil type widely distributed in the tropical and subtropical regions of southern China, the acid red soil has a significant impact on the grounding system of power facilities due to its acidic characteristics. The grounding system is responsible for directing lightning current and fault current into the ground, ensuring the safe operation of the power system. However, commonly used grounding materials such as carbon steel, galvanized steel, and copper are prone to corrosion in acid red soil environments, directly threatening the long-term stability and reliability of power facilities. The corrosive nature of acid red soil poses a higher failure rate for grounding materials, increasing maintenance and replacement costs.
[0003] The formation of acid red soil is influenced by factors such as climate, geology, and topography over a long period of time. Its soil environment has strong acidity (pH value between 4.5 and 6), which greatly accelerates the corrosion rate of metals. Once the grounding material is corroded, not only will it increase the grounding resistance and affect the electrical performance, but it will also shorten the service life of the grounding device, leading to more maintenance and replacement needs. This has become a real operational challenge for power facilities in many acid red soil distribution areas.
[0004] Currently, although various corrosion prevention techniques such as increasing material cross-sectional area, using plating protection, and cathodic protection are applied to grounding systems, due to the complexity of acid red soil environments and the spatiotemporal variability of their physicochemical properties, existing corrosion prevention methods still cannot fully meet the long-term maintenance-free requirements. Therefore, it is particularly necessary to develop a new type of alloy grounding material with high corrosion resistance and maintenance-free. SUMMARY
[0005] The present application aims to at least solve one of the technical problems existing in the prior art, and provides an alloy composite grounding material suitable for acid red soil and a preparation method thereof.
[0006] The technical solution of the present application is as follows:
[0007] A preparation method of an alloy composite grounding material suitable for acid red soil, comprising the following steps:
[0008] S1: melt the alloy raw material to obtain a molten material; the alloy raw material comprises 4-6wt% Ni, 8-10wt% Al, 0.1-0.3wt% Mo, 0.001-0.03wt% Nb, and the balance of Cu;
[0009] S2: coat the molten material on the surface of the core material and cool to obtain a semi-finished product;
[0010] S3: the semi-finished product is drawn and annealed to obtain the finished product.
[0011] Preferably, in step S2, the specific coating method is as follows:
[0012] The scale graphite and carbon fiber are mixed with a binder to form a precursor solution, then the core material is immersed in the precursor solution, taken out, dried to obtain a pre-product, and the pre-product is passed through a molten material at a gradient rate in an inert atmosphere, and cooled to obtain a semi-finished product.
[0013] Preferably, the gradient rate is specifically as follows: 1-3 m / s in the first stage, 5-10 m / s in the second stage, 10-15 m / s in the third stage, and 15-25 m / s in the fourth stage.
[0014] Preferably, the binder solution is polyvinyl alcohol.
[0015] Preferably, the total amount of scale graphite and carbon fiber added accounts for 1-3 wt% of the binder solution.
[0016] Preferably, the mass ratio of scale graphite to carbon fiber is 3-5:1.
[0017] Preferably, the annealing temperature is 600-900℃, and the annealing environment is vacuum.
[0018] The application also discloses an alloy composite grounding material suitable for acid red soil, which is prepared by the preparation method.
[0019] The application has the following beneficial effects:
[0020] The addition of nickel in the alloy raw material of the application can greatly improve the acid resistance and corrosion resistance of the material, reduce the anode activity, in addition, the addition of molybdenum enhances the corrosion resistance of the alloy in the reducing environment; niobium can improve the strength and creep resistance of the alloy material. In addition, the scale graphite and carbon fiber are doped between the alloy layer and the core material, which improves the corrosion resistance and the flexible connection between the alloy layer and the core material; furthermore, the application adopts a gradient passing rate to obtain an alloy layer with a partial amorphous structure. The amorphous alloy has excellent corrosion resistance. DETAILED DESCRIPTION
[0021] The embodiments of the application are described in detail below. The embodiments described below are exemplary and are used to explain the application, and cannot be understood as a limitation of the application. If the specific technology or conditions are not specified in the embodiments, the technology or conditions described in the literature in the art or according to the product manual are used. If the reagents or instruments are not specified by the manufacturer, they are all conventional products that can be obtained by market purchase.
[0022] The core material in the following examples adopts No. 20 steel (high-quality carbon steel).
[0023] Example 1
[0024] A preparation method of an alloy composite grounding material suitable for acid red soil includes the following steps:
[0025] S1: melt alloy raw materials to obtain a molten material; the alloy raw materials include 5wt% Ni, 9wt% Al, 0.2wt% Mo, 0.002wt% Nb, and the balance of Cu;
[0026] S2: coat the molten material on the surface of the core material, and cool to obtain a semi-finished product;
[0027] S3: the semi-finished product is subjected to drawing and annealing treatment to obtain a finished product.
[0028] In step S2, the specific coating method is:
[0029] The scale graphite and carbon fiber are mixed with a binder to prepare a precursor solution, then the core material is immersed in the precursor solution, taken out, dried to obtain a pre-product, and the pre-product is passed through a molten material at a ladder rate in an inert atmosphere, and cooled to obtain a semi-finished product.
[0030] The ladder rate is specifically: 3m / s in the first stage, 8m / s in the second stage, 12m / s in the third stage, and 25m / s in the fourth stage.
[0031] The binder solution is polyvinyl alcohol.
[0032] The total addition amount of scale graphite and carbon fiber accounts for 1wt% of the binder solution.
[0033] The mass ratio of scale graphite to carbon fiber is 5:1.
[0034] The annealing temperature is 800℃, and the annealing environment is vacuum.
[0035] Example 2
[0036] A preparation method of an alloy composite grounding material suitable for acid red soil includes the following steps:
[0037] S1: melt alloy raw materials to obtain a molten material; the alloy raw materials include 5wt% Ni, 9wt% Al, 0.2wt% Mo, 0.002wt% Nb, and the balance of Cu;
[0038] S2: coat the molten material on the surface of the core material, and cool to obtain a semi-finished product;
[0039] S3: the semi-finished product is subjected to drawing and annealing treatment to obtain a finished product.
[0040] In step S2, the specific coating method is as follows:
[0041] The flake graphite and carbon fiber are mixed with a binder to form a precursor solution, and then the core material is immersed in the precursor solution, taken out, dried, and a pre-product is obtained. The pre-product is passed through the melt at a step rate under an inert atmosphere, and cooled to obtain a semi-finished product.
[0042] The step rate is specifically: 3 m / s in the first stage, 8 m / s in the second stage, 12 m / s in the third stage, and 25 m / s in the fourth stage.
[0043] The binder solution is polyvinyl alcohol.
[0044] The total addition amount of the flake graphite and carbon fiber accounts for 2wt% of the binder solution.
[0045] The mass ratio of the flake graphite to the carbon fiber is 5:1.
[0046] The annealing temperature is 800°C, and the annealing environment is vacuum.
[0047] Example 3
[0048] A preparation method of an alloy composite grounding material suitable for acid red soil includes the following steps:
[0049] S1: Melting an alloy raw material to obtain a melt; the alloy raw material includes: 5wt% Ni, 9wt% Al, 0.2wt% Mo, 0.002wt% Nb, and the balance of Cu;
[0050] S2: Coating the melt on the surface of the core material, and cooling to obtain a semi-finished product;
[0051] S3: The semi-finished product is subjected to drawing and annealing treatment to obtain a finished product.
[0052] In step S2, the specific coating method is as follows:
[0053] The flake graphite and carbon fiber are mixed with a binder to form a precursor solution, and then the core material is immersed in the precursor solution, taken out, dried, and a pre-product is obtained. The pre-product is passed through the melt at a step rate under an inert atmosphere, and cooled to obtain a semi-finished product.
[0054] The step rate is specifically: 3 m / s in the first stage, 8 m / s in the second stage, 12 m / s in the third stage, and 25 m / s in the fourth stage.
[0055] The binder solution is polyvinyl alcohol.
[0056] The total addition amount of the flake graphite and carbon fiber accounts for 3wt% of the binder solution.
[0057] The mass ratio of the flaky graphite and the carbon fiber is 5:1.
[0058] The annealing treatment temperature is 800 DEG C, and the annealing environment is vacuum.
[0059] Embodiment 4
[0060] A preparation method of an alloy composite grounding material suitable for acid red soil, comprising the following steps:
[0061] S1: melting alloy raw materials to obtain a molten material; the alloy raw materials comprise 5wt% Ni, 9wt% Al, 0.2wt% Mo, 0.002wt% Nb, and the balance of Cu;
[0062] S2: coating the molten material on the surface of the core material, and cooling to obtain a semi-finished product;
[0063] S3: drawing and annealing the semi-finished product to obtain a finished product.
[0064] In step S2, the specific coating method is:
[0065] The flaky graphite, the carbon fiber and the binder are prepared into a precursor solution, then the core material is immersed in the precursor solution, taken out and dried to obtain a pre-product, the pre-product is passed through the molten material at a ladder rate in an inert atmosphere, and cooled to obtain a semi-finished product.
[0066] The ladder rate is specifically: 3m / s in the first stage, 8m / s in the second stage, 12m / s in the third stage, and 25m / s in the fourth stage.
[0067] The binder solution is polyvinyl alcohol.
[0068] The total additive amount of the flaky graphite and the carbon fiber accounts for 2wt% of the binder solution.
[0069] The mass ratio of the flaky graphite and the carbon fiber is 4:1.
[0070] The annealing treatment temperature is 800 DEG C, and the annealing environment is vacuum.
[0071] Embodiment 5
[0072] A preparation method of an alloy composite grounding material suitable for acid red soil, comprising the following steps:
[0073] S1: melting alloy raw materials to obtain a molten material; the alloy raw materials comprise 5wt% Ni, 9wt% Al, 0.2wt% Mo, 0.002wt% Nb, and the balance of Cu;
[0074] S2: coating the molten material on the surface of the core material, cooling to obtain a semi-finished product;
[0075] S3: drawing and annealing the semi-finished product to obtain a finished product.
[0076] In step S2, the specific coating method is:
[0077] The scale graphite and the carbon fiber are mixed with the binder to form a precursor solution, then the core material is immersed in the precursor solution, taken out and dried to obtain a pre-product, and the pre-product is passed through the molten material at a ladder rate in an inert atmosphere, and cooled to obtain a semi-finished product.
[0078] The ladder rate is specifically: 3 m / s in the first stage, 8 m / s in the second stage, 12 m / s in the third stage, and 25 m / s in the fourth stage.
[0079] The binder solution is polyvinyl alcohol.
[0080] The total addition amount of the scale graphite and the carbon fiber accounts for 2wt% of the binder solution.
[0081] The mass ratio of the scale graphite to the carbon fiber is 3:1.
[0082] The annealing temperature is 800°C, and the annealing environment is vacuum.
[0083] Example 6
[0084] A preparation method of an alloy composite grounding material suitable for acidic red soil includes the following steps:
[0085] S1: melting an alloy raw material to obtain a molten material; the alloy raw material includes: 5wt% Ni, 9wt% Al, 0.2wt% Mo, 0.002wt% Nb, and the balance of Cu;
[0086] S2: coating the molten material on the surface of the core material, cooling to obtain a semi-finished product;
[0087] S3: drawing and annealing the semi-finished product to obtain a finished product.
[0088] In step S2, the specific coating method is:
[0089] The scale graphite and the carbon fiber are mixed with the binder to form a precursor solution, then the core material is immersed in the precursor solution, taken out and dried to obtain a pre-product, and the pre-product is passed through the molten material at a ladder rate in an inert atmosphere, and cooled to obtain a semi-finished product.
[0090] The ladder rate is specifically: 3 m / s in the first stage, 8 m / s in the second stage, 12 m / s in the third stage, and 25 m / s in the fourth stage.
[0091] The binder solution is polyvinyl alcohol.
[0092] The total addition amount of the flake graphite and the carbon fiber accounts for 2wt% of the binder solution.
[0093] The mass ratio of the flake graphite to the carbon fiber is 5:1.
[0094] The annealing treatment temperature is 800℃, and the annealing environment is vacuum.
[0095] Comparative Example 1 (without using precursor solution)
[0096] The change is specifically made on the basis of Example 1, and specifically, the semi-finished product is passed through the molten material at a ladder rate in an inert atmosphere, cooled, and a semi-finished product is obtained. The rest is the same as Example 1.
[0097] Comparative Example 2 (using a single substance as the precursor solution)
[0098] The change is specifically made on the basis of Example 1, and specifically, the flake graphite and the binder are prepared into a precursor solution, then the core material is immersed in the precursor solution, taken out, dried, and a pre-product is obtained. The pre-product is passed through the molten material at a ladder rate in an inert atmosphere, cooled, and a semi-finished product is obtained. The addition amount of the flake graphite accounts for 1wt% of the binder solution. The rest is the same as Example 1.
[0099] Comparative Example 3 (using a single substance as the precursor solution)
[0100] The change is specifically made on the basis of Example 1, and specifically, the carbon fiber and the binder are prepared into a precursor solution, then the core material is immersed in the precursor solution, taken out, dried, and a pre-product is obtained. The pre-product is passed through the molten material at a ladder rate in an inert atmosphere, cooled, and a semi-finished product is obtained. The addition amount of the carbon fiber accounts for 1wt% of the binder solution. The rest is the same as Example 1.
[0101] Comparative Example 4 (using a single passing rate)
[0102] The change is specifically made on the basis of Example 1, and specifically, the flake graphite, the carbon fiber and the binder are prepared into a precursor solution, then the core material is immersed in the precursor solution, taken out, dried, and a pre-product is obtained. The pre-product is passed through the molten material at a rate in an inert atmosphere, cooled, and a semi-finished product is obtained. The rate is specifically 10m / s.
[0103] The above examples and comparative examples are tested for performance. The test results are shown in Table 1.
[0104] The test method is as follows:
[0105] (1) Corrosion resistance test: the aluminum-copper alloy composite grounding material obtained in the examples and the comparative examples is processed into samples of the same size, buried in acid soil (pH = 4.5-6) in the laboratory for accelerated corrosion test, the soil temperature is 60℃, the soil moisture content is 25%, and the total salt content of the soil is 20%, after 360 hours of high temperature and high moisture content accelerated test, the corrosion weight loss (mg) of the sample is calculated by weighing.
[0106] (2) The grounding material obtained in the examples and the comparative examples is processed into samples of the same size, and tensile test is carried out on a universal testing machine to measure the yield strength (MPa).
[0107] The results are shown in Table 1.
[0108] Table 1: Performance test results of the examples and the comparative examples
[0109] Specimen Corrosion weight loss (mg) Yield strength (Mpa) Example 1 95 415 Example 2 99 405 Example 3 101 401 Example 4 99 409 Example 5 98 410 Example 6 96 412 Comparative Example 1 195 239 Comparative Example 2 125 305 Comparative Example 3 120 310 Comparative Example 4 159 287
[0110] As can be seen from Table 1, the performance of the examples is better than that of the comparative examples, and the main reasons may be as follows: the addition of nickel in the alloy raw material of the present application can greatly improve the acid resistance and corrosion resistance of the material, and reduce the anode activity, in addition, the addition of molybdenum enhances the corrosion resistance of the alloy in the reducing environment; niobium can improve the strength and creep resistance of the alloy material. In addition, the present application adds flaky graphite and carbon fiber between the alloy layer and the core material, which improves the corrosion resistance and the flexible connection between the alloy layer and the core material; furthermore, the present application uses a gradient through rate to obtain an alloy layer with a partial amorphous structure. The amorphous alloy has excellent corrosion resistance.
[0111] Without conflict, the above additional technical features can be freely combined and used by those skilled in the art.
[0112] The above-described examples only express the preferred embodiments of the present application, which are described in detail and specifically, but should not be understood as limiting the scope of the patent of the present application. It should be noted that for those skilled in the art, other various corresponding changes and modifications can be made according to the above-described technical solutions and concepts, and all these changes and modifications should be within the scope of protection of the claims of the present application.
Claims
1. A method for preparing an alloy composite grounding material suitable for acidic red soil, characterized in that, Includes the following steps: S1: Melt the alloy raw materials to obtain the molten material; the alloy raw materials include: 4-6 wt% Ni, 8-10 wt% Al, 0.1-0.3 wt% Mo, 0.001-0.03 wt% Nb and the balance Cu; S2: Coat the core material with the molten material and cool it to obtain a semi-finished product; S3: The semi-finished product is drawn and annealed to obtain the finished product.
2. The method for preparing an alloy composite grounding material suitable for acidic red soil according to claim 1, characterized in that, In step S2, the specific wrapping method is as follows: Flake graphite, carbon fiber and binder are formulated into a precursor solution, then the core material is immersed in the precursor solution, removed and dried to obtain a pre-made product. The pre-made product is passed through the molten material at a stepped rate in an inert atmosphere and cooled to obtain a semi-finished product.
3. The method for preparing an alloy composite grounding material suitable for acidic red soil according to claim 2, characterized in that, The step rate is as follows: 1-3 m / s for the first stage, 5-10 m / s for the second stage, 10-15 m / s for the third stage, and 15-25 m / s for the fourth stage.
4. The method for preparing an alloy composite grounding material suitable for acidic red soil according to claim 2, characterized in that, The adhesive solution is polyvinyl alcohol.
5. The method for preparing an alloy composite grounding material suitable for acidic red soil according to claim 2, characterized in that, The total amount of flake graphite and carbon fiber added is 1-3 wt% of the binder solution.
6. The method for preparing an alloy composite grounding material suitable for acidic red soil according to claim 2, characterized in that, The mass ratio of the flake graphite to the carbon fiber is 3-5:
1.
7. The method for preparing an alloy composite grounding material suitable for acidic red soil according to claim 1, characterized in that, The annealing temperature is 600-900℃, and the annealing environment is a vacuum.
8. An alloy composite grounding material suitable for acidic red soil, characterized in that, It is prepared by any one of the preparation methods described in claims 1-7.