Method for enhancing corrosion resistance of copper-clad steel grounding material soil of power grid line

Abstract

The invention discloses a method for enhancing the soil corrosion resistance of a copper-clad steel grounding material, and relates to the field of metal material corrosion prevention. The copper-clad steel grounding material is electrified in an electrolyte solution for oxidation treatment, and a preliminary oxidation film is formed on the surface of the copper-clad steel grounding material; then the copper-coated steel grounding material subjected to oxidation treatment is buried in soil for natural corrosion, a secondary oxidation film is formed on the surface of the copper-coated steel grounding material, the oxidation treatment and natural corrosion are repeated, and the copper-coated steel grounding material with a compact oxidation film on the surface is obtained; the copper-coated steel grounding material prepared by the preparation method disclosed by the invention has the advantage that the soil corrosion resistance is remarkably improved.

Description

Technical Field

[0001] The invention relates to the field of metal material corrosion prevention, and in particular to a method for enhancing the soil corrosion prevention performance of a copper-clad steel grounding material. Background Art

[0002] Copper Clad Steel (CCS) is widely used in power grid grounding systems because it combines the high conductivity of copper with the high strength of steel. The main function of the power grid grounding system is to provide a low impedance path to safely conduct fault current into the ground, thereby protecting the safety of equipment and personnel. The copper layer of CCS provides excellent conductivity, ensuring efficient power transmission, while its internal steel core gives it excellent mechanical strength and stability, making it an ideal material for power grid grounding systems.

[0003] However, the grid grounding materials are buried underground for a long time, facing complex soil environment and are easily affected by corrosion. Although copper shows excellent corrosion resistance in natural environment, its corrosion rate may still be fast in some acidic or other harsh environments, affecting the stability and life of the grounding system. Therefore, how to improve the corrosion resistance of copper-clad steel grounding materials in complex soil environment has become an urgent problem to be solved. Summary of the invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a method for enhancing the soil corrosion resistance of copper-clad steel grounding materials.

[0005] The technical solution of the present invention is as follows:

[0006] A method for enhancing the soil corrosion resistance of copper-clad steel grounding materials, comprising: applying electricity to the copper-clad steel grounding materials in an electrolyte solution for oxidation treatment, forming a primary oxide film on the surface of the copper-clad steel grounding materials, and then burying the oxidized copper-clad steel grounding materials in soil for natural corrosion, forming a secondary oxide film on the surface of the copper-clad steel grounding materials, repeating the above oxidation treatment and natural corrosion, and obtaining a copper-clad steel grounding material with a dense oxide film on the surface.

[0007] As a preferred embodiment of the present invention, the copper-clad steel grounding material is pre-treated by surface grinding before oxidation treatment.

[0008] As a preferred embodiment of the present invention, the oxidation treatment is specifically:

[0009] The copper-clad steel grounding material is used as the electrode, and resin is used to seal both ends of the electrode. The sealed electrode is placed in an electrolyte solution, and alternating current with a certain current density is passed through it.

[0010] As a preferred embodiment of the present invention, the electrolyte solution includes NaCl and KCl, the concentration range of the two is 0.01 g / mL-1 g / mL, and the pH value of the electrolyte solution is 1-7.

[0011] As a preferred embodiment of the present invention, the frequency of the alternating current is 40-60 Hz, and the current density range is 0.1 A / dm 2 -3A / dm 2 , the power-on time is 30min-14 days.

[0012] As a preferred embodiment of the present invention, the resin is a cold mounting resin.

[0013] As a preferred embodiment of the present invention, the soil is at least one of loam, brown soil, clay, red soil, brown soil, loess soil and lime soil.

[0014] As a preferred embodiment of the present invention, the above oxidation treatment and natural corrosion are repeated 2-6 times.

[0015] The beneficial effects of the present invention are:

[0016] (1) A method for enhancing the soil corrosion resistance of copper-clad steel grounding materials of the present invention comprises applying alternating current in a solution to oxidize the surface of the copper-clad steel to form a primary oxide film. The treated material is buried in the soil, and a secondary oxide film is generated by a natural corrosion process. This process is repeated to form a dense oxide film on the surface of the copper-clad steel. The dense film significantly improves the corrosion resistance of the material and reduces the material loss caused by corrosion.

[0017] (2) The method for enhancing the soil corrosion resistance of copper-clad steel grounding materials of the present invention effectively blocks the penetration of corrosive media due to the dense oxide film formed, significantly reducing the corrosion rate, thereby extending the service life of the copper-clad steel grounding materials. This is particularly important in the power grid grounding system, which can reduce maintenance frequency and cost and ensure the long-term stability and reliability of the grounding system.

[0018] (3) A method for enhancing the soil corrosion resistance of copper-clad steel grounding materials of the present invention forms a multi-layer protective film by using alternating current to oxidize the surface of the copper-clad steel in a solution and combining it with a natural corrosion process. This process is simple and easy to implement, does not require complex equipment and high costs, and is suitable for large-scale application.

[0019] (4) The present invention is a method for enhancing the soil corrosion resistance of copper-clad steel grounding materials. Compared with traditional anti-corrosion methods, the treatment process of the present invention can significantly improve the corrosion resistance of copper-clad steel materials at a lower cost, reduce the replacement and maintenance costs caused by material corrosion, and has good economic benefits.

[0020] (5) The present invention provides a method for enhancing the soil corrosion resistance of copper-clad steel grounding materials. The treated copper-clad steel materials show excellent corrosion resistance in various complex soil environments. Whether in acidic, alkaline or other highly corrosive soil environments, they can maintain a low corrosion rate, thereby ensuring the safety and reliability of the grounding system.

[0021] In summary, the present invention greatly improves the corrosion resistance of copper-clad steel grounding materials, extends its service life, optimizes the process flow, and improves economic benefits by using alternating current to oxidize the copper-clad steel surface in a solution and combining it with a natural corrosion process to form a dense oxide film. It is suitable for various complex soil environments and provides reliable technical guarantees for the design and maintenance of power grid grounding systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a diagram showing the changes in the copper-clad steel grounding material of the present invention before and after being treated under different conditions. DETAILED DESCRIPTION

[0023] In order to enhance the corrosion resistance of copper-clad steel in soil, the present invention proposes a method for oxidizing the surface of copper-clad steel by using alternating current in solution. The method is to oxidize the surface of copper-clad steel in solution using alternating current, and then bury it in soil to form a secondary oxide film on the surface using the natural corrosion process. By repeatedly performing this process, a dense oxide film is formed on the surface of copper-clad steel, thereby significantly improving the corrosion resistance of grounding materials in complex soil environments.

[0024] The above method comprises the following steps:

[0025] S1: Pre-treat the surface of the copper-clad steel grounding material by grinding to remove surface oxides and impurities, increase surface roughness, and improve the subsequent treatment effect. Then, weld a copper wire to one end of the copper-clad steel grounding material. Alternatively, the wire may be directly energized through a fixture without welding, and used as an electrode.

[0026] Specifically, the copper-clad steel grounding material is mainly made of copper-clad steel composite material, which can be at least one of copper-clad round steel, copper-clad flat steel, and copper-clad square steel, and is not restricted by wire shape and length.

[0027] S2: Use resin to seal both ends of the electrode. Specifically, the resin material is generally a cold embedding resin. A general resin material with waterproof and anti-corrosion properties may also be used, including but not limited to curable epoxy resin, acrylate resin, and polyurethane resin.

[0028] S3: Connect the two electrodes to two poles of a power source respectively. Preferably, the power source is a commercially available AC power adapter transformer with a frequency of 40-60 Hz;

[0029] S4: preparing an electrolyte solution with a certain pH and conductivity, and inserting the above-mentioned electrodes; specifically, the electrolyte solution has a pH range of 1-7, including NaCl and KCl, and a concentration range of 0.01 g / mL-1 g / mL to ensure appropriate conductivity and electrolysis conditions.

[0030] S5: Turn on the power supply and pass AC with a certain current density for a period of time to pre-oxidize the electrode surface; the AC frequency is 40-60Hz, and the current density range is 0.1A / dm 2 ~3A / dm 2 , the power-on time is 30min-14 days.

[0031] S6: Take out the above-mentioned electrodes, wash them with clean water, and bury them in the soil for a period of time for secondary oxidation treatment; the soil is all natural environment soil, including but not limited to loam, brown soil, clay, red soil, brown soil, loess soil, lime soil, etc.

[0032] S7: Repeat the above steps S2-S6 multiple times, preferably 2-6 times.

[0033] S8: Clean and dry the electrode surface.

[0034] This method can not only effectively improve the corrosion resistance of copper-clad steel materials, but also extend their service life in the grounding system, reduce maintenance costs, and ensure the safety and stability of power grid operation. Through laboratory simulation and actual application tests, the effectiveness of this method in enhancing the soil corrosion resistance of copper-clad steel grounding materials has been verified, providing new ideas and scientific basis for the design and material selection of power grid grounding systems.

[0035] The present invention will be further described below in conjunction with preferred embodiments.

[0036] Example 1: Anti-corrosion treatment of copper-clad steel grounding material

[0037] A method for enhancing the soil corrosion resistance of copper-clad steel grounding materials, the specific steps are as follows:

[0038] (1) Material preparation and pretreatment

[0039] A. Surface grinding pretreatment

[0040] Grinding: Use 350-mesh and 1000-mesh sandpaper to grind the copper-clad steel grounding material in turn.

[0041] Welding copper wire: Weld the copper wire to one end of the polished copper-clad steel grounding material. Figure 1 (a) If the wire is not welded, the current is directly applied through the fixture.

[0042] B. Electrode sealing treatment

[0043] Resin sealing: Use cold mounting resin to seal both ends of the prepared electrode to ensure that the electrode is partially exposed to the electrolyte solution.

[0044] (2) Electrolytic oxidation treatment

[0045] A. Connect electrodes: Connect the processed copper-clad steel electrodes to the positive and negative poles of the power supply respectively.

[0046] B. Prepare electrolyte solution

[0047] Solution preparation: Prepare electrolyte solution with pH value controlled at 6 and NaCl and KCl concentrations both at 0.05 g / mL.

[0048] C. Oxidation treatment

[0049] Insertion into electrolyte solution: Insert the connected electrodes into the electrolyte solution.

[0050] Power-on treatment: Turn on the power and apply 1A / dm 2 The current density of the alternating current was continuously treated for 7 days to pre-oxidize the electrode surface and form a preliminary oxide film. Figure 1 (b).

[0051] D. Cleaning and burying

[0052] Cleaning: Take out the oxidized copper-clad steel electrode and clean it with deionized water.

[0053] Soil burial treatment: The cleaned electrodes were buried in acidic soil (pH 5.5) and subjected to natural corrosion treatment for 7 days to form a secondary oxide film. Figure 1 (d).

[0054] (3) Repeat processing and post-processing

[0055] A. Repeat steps

[0056] Repeat step (2) three times to form a multi-layer dense oxide film on the surface of the copper-clad steel.

[0057] B. Final cleaning and drying

[0058] Cleaning and drying: Take out the electrode, clean the surface thoroughly with deionized water, and blow it dry with compressed air to ensure that there is no residue on the electrode surface.

[0059] Example 2

[0060] This embodiment is a variation of the embodiment 1. Specifically, the power-on treatment is as follows: turn on the power supply and apply 2A / dm 2The current density of the alternating current was continuously treated for 7 days to pre-oxidize the electrode surface and form a preliminary oxide film. Figure 1 (c).

[0061] Example 3

[0062] This embodiment is a variation of the embodiment 2, specifically, the soil burial treatment: the cleaned electrodes are buried in acidic soil (pH 5.5) and subjected to natural corrosion treatment for 14 days to form a secondary oxide film. Figure 1 (e).

[0063] Example 4

[0064] This embodiment is a variation of the embodiment 1. Specifically, the power-on treatment is as follows: turn on the power supply and apply 1A / dm 2 The alternating current with a current density of 10000 W was applied for 30 min to pre-oxidize the electrode surface and form a preliminary oxide film.

[0065] Example 5

[0066] This embodiment is a variation of the embodiment 1. Specifically, the power-on treatment is as follows: turn on the power supply and apply 1A / dm 2 The alternating current with a current density of is applied for 1 day to pre-oxidize the electrode surface and form a preliminary oxide film.

[0067] Example 6

[0068] This embodiment is a variation of the embodiment 1. Specifically, the power-on treatment is as follows: turn on the power supply and apply 1A / dm 2 The alternating current with a current density of 10000 is continuously applied for 14 days to pre-oxidize the electrode surface and form a preliminary oxide film.

[0069] The appearance of the copper-clad steel materials treated by Examples 1-3 and the untreated copper-clad steel materials were observed, and the results are shown in Figure 1 It can be seen that a uniform and dense oxide film is formed on the surface of the copper-clad steel grounding material.

[0070] At the same time, after backfilling in acidic soil (pH=5.5), Examples 1-6 were left to stand for 12 days to test their corrosion rate and resistivity. The test results are shown in Table 1.

[0071] Table 1 Performance test results of Examples 1-6

[0072] Sample Corrosion rate (mm / a) Resistivity (Ω·m) Example 1 0.0125 <![CDATA[0.8×10 -5 ]]> Example 2 0.0123 <![CDATA[0.8×10 -5 ]]> Example 3 0.0120 <![CDATA[0.8×10 -5 ]]> Example 4 0.0145 <![CDATA[0.8×10 -5 ]]> Example 5 0.0138 <![CDATA[0.8×10 -5 ]]> Example 6 0.0127 <![CDATA[0.8×10 -5 ]]> Untreated copper clad steel material 0.0218 <![CDATA[0.6×10 -5 ]]>

[0073] As can be seen from the above table, the method of the present invention significantly improves the corrosion resistance of the copper-clad steel grounding material: the corrosion rate of the treated copper-clad steel material in acidic soil is significantly reduced, indicating that the surface oxide film has an excellent protective effect.

[0074] At the same time, the conductivity remains stable: despite multiple oxidation treatments, the conductivity of the copper-clad steel material (resistivity less than 1×10 -5 Ω·m, and compared with the untreated copper-clad steel material, the increase is very small), it still remains stable and meets the requirements of the power grid grounding system.

[0075] In summary, the durability of the treated copper-clad steel grounding material in a complex soil environment is greatly enhanced, the service life of the grounding system is extended, and the maintenance cost is reduced. The present invention uses alternating current in a solution to oxidize the surface of the copper-clad steel, and combines the natural corrosion process in the soil to form a multi-layer dense oxide film, thereby significantly improving the corrosion resistance of the power grid grounding material, and has good application prospects and economic benefits.

[0076] The above-mentioned embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all these changes and deformations should fall within the scope of protection of the claims of the present invention.

Claims

1. A method for enhancing the soil corrosion resistance of copper-clad steel grounding materials, characterized in that: The copper-clad steel grounding material is energized in an electrolyte solution for oxidation treatment, forming a preliminary oxide film on the surface of the copper-clad steel grounding material, and then the oxidized copper-clad steel grounding material is buried in the soil for natural corrosion, forming a secondary oxide film on the surface of the copper-clad steel grounding material, and the above-mentioned oxidation treatment and natural corrosion are repeated to obtain a copper-clad steel grounding material with a dense oxide film on the surface.

2. A method for enhancing the soil corrosion resistance of copper-clad steel grounding materials according to claim 1, characterized in that: The copper-clad steel grounding material is pre-treated by surface grinding before oxidation treatment.

3. A method for enhancing the soil corrosion resistance of copper-clad steel grounding materials according to claim 1, characterized in that: The oxidation treatment is specifically: The copper-clad steel grounding material is used as the electrode, and resin is used to seal both ends of the electrode. The sealed electrode is placed in an electrolyte solution, and alternating current with a certain current density is passed through it.

4. A method for enhancing the soil corrosion resistance of copper-clad steel grounding materials according to claim 3, characterized in that: The electrolyte solution includes NaCl and KCl, the concentration range of the two is 0.01 g / mL-1 g / mL, and the pH value of the electrolyte solution is 1-7.

5. A method for enhancing the soil corrosion resistance of copper-clad steel grounding materials according to claim 3, characterized in that: The frequency of the alternating current is 40-60 Hz, and the current density range is 0.1 A / dm 2 -3 A / dm 2 , the power-on time is 30min-14 days.

6. A method for enhancing the soil corrosion resistance of copper-clad steel grounding material according to claim 3, characterized in that: The resin is a cold mounting resin.

7. A method for enhancing the soil corrosion resistance of copper-clad steel grounding materials according to claim 1, characterized in that: The soil is at least one of loam, brown soil, clay, red soil, brown soil, loess soil and lime soil.

8. A method for enhancing the soil corrosion resistance of copper-clad steel grounding materials according to claim 1, characterized in that: The above oxidation treatment and natural corrosion are repeated 2-6 times.

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