CN-122025226-A - Multilayer composite conductive reactance corrosion grounding material and preparation method thereof

CN122025226ACN 122025226 ACN122025226 ACN 122025226ACN-122025226-A

Abstract

The invention provides a multilayer composite conductive corrosion-resistant grounding material and a preparation method thereof, and belongs to the technical field of corrosion-resistant grounding materials, wherein the multilayer composite conductive corrosion-resistant grounding material comprises a copper matrix, and a NiCrMo alloy transition layer, an Al 2 O 3 -TiO 2 complex-phase ceramic layer and a graphene modified resin layer which are sequentially stacked on the surface of the copper matrix, wherein the mass percentage of graphene in the graphene modified resin layer is 0.1-2wt%. According to the invention, the multi-layer functional coating is sequentially constructed on the surface of the copper matrix with high conductivity, so that the cooperative improvement of the grounding material in the aspects of conductivity, corrosion resistance and mechanical property is realized. The invention ensures the tight combination and stable performance of each coating by the technologies of HVOF spraying, laser remelting, nano hole sealing, coating solidification and the like.

Inventors

WANG DIJIN
JIANG ZE
DENG JIANXIN
LI BAOKANG
YAO WEIYING
FAN YULING
LI SHUANGYAN

Assignees

湖北启进电力科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260330

Claims (10)

1. The multilayer composite conductive reactance corrosion grounding material is characterized by comprising a copper matrix, and a NiCrMo alloy transition layer, an Al 2 O 3 -TiO 2 multiphase ceramic layer and a graphene modified resin layer which are sequentially stacked on the surface of the copper matrix; The mass percentage of graphene in the graphene modified resin layer is 0.1-2 wt%.
2. The multilayer composite conductive corrosion resistant grounding material according to claim 1, wherein the copper substrate is a copper substrate subjected to sand blasting roughening pretreatment, and the surface roughness Ra of the copper substrate subjected to sand blasting roughening pretreatment is 3-8 mu m.
3. The multilayer composite conductive corrosion resistant grounding material according to claim 1 is characterized in that the NiCrMo alloy transition layer and the Al 2 O 3 -TiO 2 complex phase ceramic layer are deposited by adopting a thermal spraying mode, wherein the thermal spraying is specifically supersonic flame spraying; And/or the thickness of the NiCrMo alloy transition layer is 30-80 mu m; And/or the thickness of the Al 2 O 3 -TiO 2 complex phase ceramic layer is 50-150 mu m; and/or the thickness of the graphene modified resin layer is 5-30 μm.
4. The multi-layer composite conductive corrosion resistant grounding material according to claim 1, wherein the atomic number ratio of Ni, cr and Mo in the NiCrMo alloy transition layer is (70-85): (12-25): (1-8); And/or, in the Al 2 O 3 -TiO 2 multiphase ceramic layer, the mass fraction of TiO 2 is 20-40%, and the mass fraction of Al 2 O 3 is 60-80%.
5. The method for preparing the multilayer composite conductive corrosion-resistant grounding material according to any one of claims 1 to 4, comprising the steps of: S1, carrying out sand blasting pretreatment on a copper matrix; s2, performing first thermal spraying and depositing a NiCrMo alloy transition layer on the surface of the pretreated copper matrix; S3, performing second thermal spraying deposition of an Al 2 O 3 -TiO 2 multiphase ceramic layer on the surface of the NiCrMo alloy transition layer; s4, sequentially carrying out laser remelting treatment and nano hole sealing treatment on the surface of the Al 2 O 3 -TiO 2 multiphase ceramic layer; And S5, coating graphene modified resin on the surface of the Al 2 O 3 -TiO 2 multiphase ceramic layer subjected to nano hole sealing treatment, and curing to obtain the multilayer composite conductive corrosion-resistant grounding material.
6. The method for preparing the multilayer composite conductive corrosion-resistant grounding material, according to claim 5, is characterized by comprising the steps of degreasing, cleaning and drying the surface of a copper matrix, adopting a sand blasting abrasive, controlling the sand blasting pressure to be 0.4-0.6 MPa, and performing sand blasting treatment on the surface of the copper matrix until the surface roughness Ra of the copper matrix reaches 3-8 mu m, wherein the sand blasting distance is 80-120 mm.
7. The preparation method of the multilayer composite conductive corrosion-resistant grounding material according to claim 5, wherein the first thermal spraying mode is supersonic flame spraying, the spraying conditions are that the fuel flow is 180-220L/min, the oxygen flow is 550-650L/min, the spraying distance is 180-220 mm, the spraying particle speed is 500-700 m/s, the powder feeding speed is 20-50 g/min, the moving speed of a spray gun is 200-500 mm/s, and the spraying overlap ratio is controlled to be 30% -50%; And/or the second thermal spraying mode is supersonic flame spraying, wherein the spraying condition is that the spraying distance is 180-220 mm, the spraying particle speed is 500-700 m/s, the powder feeding speed is 15-45 g/min, the moving speed of a spray gun is 200-500 mm/s, and the spraying overlap ratio is controlled to be 30% -50%.
8. The preparation method of the multilayer composite conductive corrosion-resistant grounding material is characterized by specifically comprising the steps of carrying out laser scanning remelting on the surface of an Al 2 O 3 -TiO 2 complex-phase ceramic layer by using a laser, wherein the laser power is 2.0-2.5 kW, the scanning speed is 5-10 mm/s, the spot diameter is 1-4 mm, the laser scanning is carried out in a parallel channel mode, and the overlapping rate between scanning channels is controlled to be 30% -50%.
9. The method for preparing the multilayer composite conductive corrosion-resistant grounding material according to claim 5, wherein the nano hole sealing treatment comprises the steps of immersing a sample subjected to laser remelting treatment in a hole sealing precursor solution for 30-60 min, taking out, standing to volatilize a solvent, and performing curing treatment; the hole sealing precursor solution is prepared from tetraethoxysilane, ethanol and water; The temperature of the curing treatment is 120-160 ℃.
10. The preparation method of the multilayer composite conductive corrosion-resistant grounding material is characterized by comprising the steps of dispersing graphene powder into epoxy resin, and uniformly mixing the epoxy resin with a curing agent after vacuum defoaming to obtain the graphene modified resin, wherein the dispersing comprises high-speed shearing dispersing and ultrasonic dispersing.

Description

Multilayer composite conductive reactance corrosion grounding material and preparation method thereof Technical Field The invention relates to the technical field of anti-corrosion grounding materials, in particular to a multilayer composite conductive anti-corrosion grounding material and a preparation method thereof. Background The grounding down conductor of the overhead transmission line is an important component for guaranteeing the safe operation of the power system, and the corrosion resistance of the grounding down conductor is directly related to the reliability and the service life of the grounding system. In recent years, with the increase of power demand and the expansion of transmission lines, the problem of corrosion prevention of the ground down conductor is attracting increasing attention. The ground down conductor is exposed to complex environments for long periods of time and is susceptible to soil corrosion, electrochemical corrosion, and atmospheric corrosion. Corrosion can lead to reduced material properties and even to breakage, which threatens the safe operation of the power system. Therefore, the development of high-performance anti-corrosion materials is a key for guaranteeing the stable operation of the power transmission line. The existing grounding down conductor material, such as the traditional galvanized steel material, has lower cost and certain mechanical strength, but the corrosion resistance of the grounding down conductor material in complex environments such as damp, multi-salt fog or acid soil is difficult to meet the long-term use requirement, and the grounding down conductor material is easy to rust to cause the rise of grounding resistance and even cause line faults. While the part adopts the stainless steel or copper grounding down conductor, although the corrosion resistance is improved, the stainless steel has relatively poor conductivity, and the copper has the problems of high cost, scarce resources, possible corrosion in soil environment and the like. In addition, although some novel nano anti-corrosion coating materials can delay the corrosion rate to a certain extent, the coating is easy to be damaged mechanically and lose efficacy, and the binding force between the coating and the matrix material can be reduced after long-term use, so that the protection effect is weakened. Therefore, developing a conductive corrosion-resistant material with both excellent conductive performance and long-acting corrosion resistance becomes a technical problem to be solved in the art. Disclosure of Invention In view of the technical problems in the background art, the invention provides a multilayer composite conductive corrosion-resistant grounding material and a preparation method thereof, and aims to solve the technical problems that the existing grounding down conductor material is difficult to consider both the conductive performance and the corrosion resistance performance and has poor long-term protection effect. In a first aspect, the invention provides a multilayer composite conductive anti-corrosion grounding material, which comprises a copper matrix, and a NiCrMo alloy transition layer, an Al 2O3-TiO2 multiphase ceramic layer and a graphene modified resin layer which are sequentially stacked on the surface of the copper matrix; The mass percentage of the graphene in the graphene modified resin layer is 0.1-2 wt%. Preferably, the copper matrix is a copper matrix subjected to sand blasting roughening pretreatment, and the surface roughness Ra of the copper matrix subjected to sand blasting roughening pretreatment is 3-8 mu m. Preferably, the NiCrMo alloy transition layer and the Al 2O3-TiO2 complex phase ceramic layer are deposited by adopting a thermal spraying mode, wherein the thermal spraying is specifically supersonic flame spraying; The thickness of the NiCrMo alloy transition layer is 30-80 mu m; the thickness of the Al 2O3-TiO2 complex phase ceramic layer is 50-150 mu m; The thickness of the graphene modified resin layer is 5-30 mu m. Preferably, the atomic number ratio of Ni, cr and Mo in the NiCrMo alloy transition layer is (70-85): (12-25): (1-8), the mass fraction of TiO 2 in the Al 2O3-TiO2 complex phase ceramic layer is 20-40%, and the mass fraction of Al 2O3 is 60-80%. In a second aspect, the invention provides a method for preparing a multilayer composite conductive reactive corrosion grounding material, comprising the following steps: S1, carrying out sand blasting pretreatment on a copper matrix; s2, performing first thermal spraying and depositing a NiCrMo alloy transition layer on the surface of the pretreated copper matrix; S3, performing second thermal spraying deposition of an Al 2O3-TiO2 multiphase ceramic layer on the surface of the NiCrMo alloy transition layer; S4, sequentially carrying out laser remelting treatment and nano hole sealing treatment on the surface of the Al 2O3-TiO2 complex-phase ceramic layer; and S5, coating graphene modifi