CN115938691A - Preparation method of overhead line with corrosion-resistant ceramic film layer - Google Patents
Preparation method of overhead line with corrosion-resistant ceramic film layer Download PDFInfo
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- CN115938691A CN115938691A CN202211701203.4A CN202211701203A CN115938691A CN 115938691 A CN115938691 A CN 115938691A CN 202211701203 A CN202211701203 A CN 202211701203A CN 115938691 A CN115938691 A CN 115938691A
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Abstract
A preparation method of an overhead line with a corrosion-resistant ceramic film layer comprises the following steps: enabling the aluminum wire to pass through a thermoelectric chemical oxidation plating tank, and generating a flexible corrosion-resistant ceramic film layer on the surface layer of the aluminum wire to obtain a corrosion-resistant aluminum wire; and twisting the corrosion-resistant aluminum wire to obtain the corrosion-resistant overhead wire. According to the method, a single aluminum wire is oxidized to form a flexible anti-corrosion ceramic film layer which is resistant to bending, and then the aluminum wire is twisted into the overhead wire, so that the aluminum wires on all the coil layers in the overhead wire are provided with the anti-corrosion ceramic film layer, the corrosion conditions of outer layer corrosion, gap corrosion and inner layer contact corrosion can be comprehensively protected, and the anti-corrosion performance of the overhead wire is greatly superior to that of the overhead wire only provided with the ceramic film layer on the outer layer.
Description
Technical Field
The invention relates to the field of overhead lines, in particular to a preparation method of an overhead line with a corrosion-resistant ceramic film layer.
Background
The aluminum base material subjected to anodic oxidation and micro-arc oxidation treatment can also generate a ceramic film layer on the surface of the aluminum base material, but the ceramic film layer generated by anodic oxidation and micro-arc oxidation treatment is of a porous structure which is not corrosion-resistant, and the aluminum base material is very easy to generate punctiform corrosion at pores in a high-corrosion gas environment, so that the aluminum base material is used as an auxiliary means for etching a microporous structure in the aspect of corrosion-resistant treatment so as to enable other corrosion-resistant materials coated subsequently to be combined with the aluminum base material more firmly.
Patent CN2022115220935 discloses an anti-corrosion overhead wire capable of reducing corona loss and a preparation method thereof, wherein a ceramic film layer with the thickness of 20-200 μm is generated on an aluminum wire at the outer layer of the overhead wire through thermoelectric chemical oxidation treatment. The ceramic film layer is a hard ceramic film layer due to the fact that the ceramic film layer is thick, is not resistant to bending and can only be applied to the well-stranded overhead line which does not need to be bent to a large extent. The corrosion of the overhead line is classified into outer layer corrosion, crevice corrosion, inner layer contact corrosion, etc., and the corrosion-resistant overhead line with the hard ceramic film layer in patent CN2022115220935 can only perform corrosion-resistant protection on the surface layer of the overhead line, but does not have the capability of performing crevice corrosion and contact corrosion on the inner layer. The hard ceramic film layer is easy to fall off during coiling and twisting, so the hard film layer in CN2022115220935 is not suitable for being applied to a single aluminum wire.
Disclosure of Invention
The invention aims to provide a preparation method of an overhead line with a corrosion-resistant ceramic film layer, which takes an aluminum line with a flexible corrosion-resistant ceramic film layer which is resistant to bending as an inner-layer aluminum line of the overhead line, so that the aluminum lines of all coil layers in the whole overhead line have corrosion resistance, and the defects in the prior art are overcome.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a preparation method of an overhead line with a corrosion-resistant ceramic film layer comprises the following steps:
(1) Under the traction of a traction device, an aluminum wire passes through a thermoelectric chemical oxidation plating tank which is a double plating tank system and comprises two mutually independent plating tanks, wherein each plating tank is internally provided with an electrode, each plating tank is connected with an independent electrolyte circulating system, and the electrodes of the two plating tanks are respectively connected with a thermoelectric chemical oxidation power supply;
(2) After the aluminum wire passes through the double plating tank system, generating a corrosion-resistant ceramic film layer on the surface layer of the aluminum wire, and airing to obtain the corrosion-resistant aluminum wire;
(3) And twisting the corrosion-resistant aluminum wire to obtain the corrosion-resistant overhead wire.
Furthermore, the thickness of the corrosion-resistant ceramic film layer is less than or equal to 15 mu m.
Furthermore, the diameter of the aluminum wire is 1-5mm, the thermoelectric chemical oxidation power supply is a bidirectional high-frequency pulse power supply, the working mode of the power supply is a constant-current mode, the voltage is 400-800V, the frequency is 400-900Hz, and the current density is 0.5-3A/dm 2 The electrolyte is silicate system electrolyte, the concentration of silicate in the electrolyte is 1-10g/L, and the speed of the aluminum wire passing through the electrolyte is 5-20 min/m.
Further, the diameter of the aluminum wire is 4.2mm, the frequency is 600Hz, and the current density is 0.8A/dm 2 The silicate concentration in the electrolyte is 8g/L, and the speed of the aluminum wire passing through the electrolyte is 8 min/m.
Further, the step (3) comprises: and twisting the corrosion-resistant aluminum wire and the bare aluminum wire together to obtain the corrosion-resistant overhead wire, wherein the corrosion-resistant aluminum wire is positioned on the outer layer of the corrosion-resistant overhead wire.
Further, the step (3) comprises: and twisting the corrosion-resistant aluminum wire and the steel core together to obtain the corrosion-resistant steel core overhead wire.
Further, the step (3) comprises: and twisting the corrosion-resistant aluminum wire and the steel core together to obtain the corrosion-resistant steel core overhead wire, wherein the corrosion-resistant aluminum wire is positioned in the inner layer attached to the steel core.
Further, the step (3) comprises: and twisting the corrosion-resistant aluminum wire and the steel core together to obtain the corrosion-resistant steel core overhead wire, wherein the corrosion-resistant aluminum wire is positioned on the inner layer attached to the steel core and the outer layer of the corrosion-resistant steel core overhead wire.
Further, the step (3) comprises: twisting the corrosion-resistant aluminum wire and the bare aluminum wire together to obtain a corrosion-resistant overhead wire, wherein the bare aluminum wire is positioned on the outer layer of the corrosion-resistant overhead wire;
further comprising the step (4): under the traction of a traction device, enabling the corrosion-resistant overhead line prepared in the step (3) to pass through a thermoelectric chemical oxidation plating pool to enable the surface layer of the outer-layer bare aluminum wire to generate a hard corrosion-resistant ceramic film layer;
the thermoelectric chemical oxidation plating tank is a double-plating tank system and comprises two mutually independent plating tanks, wherein an electrode is arranged in each plating tank, each plating tank is connected with an independent electrolyte circulating system, and the electrodes of the two plating tanks are respectively connected with a thermoelectric chemical oxidation power supply;
the hard corrosion-resistant ceramic film layer comprises an inner layer and an outer layer, wherein the inner layer is a compact layer, the outer layer is a loose porous layer, and the main component in the hard corrosion-resistant ceramic film layer is Al 2 O 3 And alpha-Al 2 O 3 In total Al 2 O 3 The proportion of the ingredients is 40 to 60 percent.
Furthermore, the thermoelectric chemical oxidation power supply is a bidirectional high-frequency pulse power supply, the voltage is 400-800V, the frequency is 900Hz, the working mode of the thermoelectric chemical oxidation power supply is a constant current mode, and the current density is 8A/dm 2 The speed of the corrosion-resistant overhead line passing through the electrolyte is 20 min/m.
Compared with the prior art, the invention has the beneficial technical effects that:
according to the method, a single aluminum wire is oxidized to form a flexible anti-corrosion ceramic film layer which is resistant to bending, and then the aluminum wire is twisted into the overhead wire, so that the aluminum wires on all the coil layers in the overhead wire are provided with the anti-corrosion ceramic film layer, the corrosion conditions of outer layer corrosion, gap corrosion and inner layer contact corrosion can be comprehensively protected, and the anti-corrosion performance of the overhead wire is greatly superior to that of the overhead wire only provided with the ceramic film layer on the outer layer.
Because the outer layer corrosion is the most serious area of the overhead line, the method firstly oxidizes a single aluminum wire to ensure that the aluminum wire has a flexible corrosion-resistant ceramic film layer with bending resistance, then twists the aluminum wire and a bare aluminum wire together into the overhead line to ensure that the bare aluminum wire is positioned at the outer layer of the overhead line, and then oxidizes the overhead line to ensure that the outer layer aluminum wire of the overhead line has a hard ceramic film layer with better corrosion resistance, and emphasizes the corrosion resistance of the outer layer aluminum wire while ensuring that the aluminum wires on all the ring layers in the overhead line have the corrosion-resistant ceramic film layer.
Drawings
FIG. 1 shows a current density of 1A/dm 2 Comparing the thicknesses of the ceramic membrane layers generated at different linear speeds, wherein the thicknesses are 5 min/m, 10 min/m and 15 min/m from left to right in sequence.
FIG. 2 is the results of the salt spray test in example 2 of the present invention;
fig. 3 is a picture of a corrosion resistant aluminum coil in a coiled state.
The specific implementation mode is as follows:
the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments.
Example 1
A preparation method of an overhead line with a corrosion-resistant ceramic film layer comprises the following steps:
(1) Setting a thermoelectric chemical oxidation plating tank:
the thermoelectric chemical oxidation plating tank is a double-plating tank system and comprises two mutually independent plating tanks, wherein an electrode is arranged in each plating tank, each plating tank is connected with an independent electrolyte circulating system, and the electrodes of the two plating tanks are respectively connected with a thermoelectric chemical oxidation power supply.
(2) Under the traction of a traction device, enabling the aluminum wire to pass through a thermoelectric chemical oxidation plating tank, enabling the aluminum wire to pass through a double plating tank system, enabling a region penetrating through electrolyte to generate a ceramic film layer through the thermoelectric chemical oxidation, enabling the aluminum wire between the plating tanks to serve as a lead to be communicated with two aluminum wires penetrating through the electrolyte, enabling the surface layer of the aluminum wire to generate a corrosion-resistant ceramic film layer after the aluminum wire passes through the double plating tank system, and airing to obtain the corrosion-resistant aluminum wire;
(3) And stranding the corrosion-resistant aluminum wire through a frame stranding machine to obtain the corrosion-resistant overhead wire.
Example 2
In this embodiment, the diameter of the aluminum wire is 4.2mm, and the power supply is a bidirectional high-frequency pulse power supply: the frequency is 600Hz, the working mode is a constant current mode, and the voltage floats between 400 and 800V; electrolyte solution: a silicate system electrolyte; the silicate concentration in the electrolyte is 8g/L; plating bath electrolyte temperature: floating at 15-20 deg.c.
Setting the Current Density to 1A/dm 2 The line speed (the total time of the 1 m aluminum wire passing through the electrolyte) is 5 min/m, 10 min/m, 15 min/m and 20 min/m in turn to obtain 4 groups of experimental samples; the duration of the oxidation treatment was set to 10min min/m, and the current density was set to 0.5A/dm in this order 2 、1A/dm 2 、1.5A/dm 2 ……3A/dm 2 6 groups of experimental samples are obtained.
And cutting the prepared aluminum wire into small sections, wrapping and curing the small sections by resin, grinding a vertical section, measuring the thickness of the generated ceramic membrane layer and observing the pore form on the section. As a result, as shown in FIG. 1, the current density was constant, and the thickness of the ceramic film layer was increased from 2 μm to 10 μm in order as the linear speed was decreased, but the porosity of the surface thereof was also increased with time.
When the linear speed is not changed, the thickness of the ceramic film layer is increased from 1 μm to 15 μm in turn as the current density is increased, and the surface porosity is also increased as time passes. The brittleness of the ceramic film increases with the increase of the thickness, the thinner the ceramic film is, the better the flexibility is, but the too thin ceramic film has through holes in the film, and the corrosion resistance is not good. The ideal flexible corrosion resistant film layer should be non-perforated and as thin as possible, as dense as possible and as low porosity as possible. And selecting a sample piece with potential corrosion resistance and an oil corrosion-resistant aluminum wire to carry out a salt spray experiment (under the salt spray experiment conditions, the pH value is 3.0, the temperature is 50 ℃, and the time is 48 hours) together.
Fig. 2 shows the salt spray experiment results, from left to right: grease corrosion-resistant aluminum wire (contrast) and ceramic film aluminum wire (1A/dm) 2 10min min/m) and ceramic film layer aluminum wire (1A/dm) 2 20min min/m) and ceramic film layer aluminum wire (1.5A/dm) 2 10min min/m) and ceramic film layer aluminum wire (1.5A/dm) 2 20min min min/m), 1A/dm can be seen 2 10min min/mThe corresponding ceramic film layer aluminum wire has the best anti-corrosion effect.
Repeating the experiment for many times, adjusting different current densities and different combinations of oxidation treatment time length, polishing, observing, measuring and carrying out 48h salt spray experiment on the obtained sample piece, wherein the optimal process scheme finally screened out is as follows: current density 0.8A/dm 2 The linear speed is 8 min/m, the thickness of the generated ceramic film layer is 4-6 mu m, the film layer is compact, the porosity is low, the cross section has no through hole, XRD shows that the component of the ceramic film layer is mainly amorphous Al 2 O 3 And a small amount of gamma-Al 2 O 3 . FIG. 3 shows the current density of 0.8A/dm in this example 2 And the oxidation treatment lasts for 8min, the surface layer of the aluminum wire is provided with a uniform ceramic coating, and the ceramic film layer does not fall off in the coiled state.
Example 3
In this embodiment, the corrosion-resistant aluminum wire and the bare aluminum wire are twisted together to form the corrosion-resistant overhead wire, wherein the corrosion-resistant aluminum wire is located at an outer layer of the corrosion-resistant overhead wire.
Example 4
In this embodiment, the corrosion-resistant aluminum wire and the steel core are twisted together to form the corrosion-resistant aluminum-steel-core stranded wire.
Example 5
In this embodiment, the corrosion-resistant aluminum wire and the steel core are twisted together to form the corrosion-resistant aluminum steel core stranded wire, wherein the corrosion-resistant aluminum wire is only located in the inner layer attached to the steel core to protect against contact corrosion.
Example 6
In this embodiment, the corrosion-resistant aluminum wire and the steel core are twisted together to form the corrosion-resistant aluminum stranded steel-core wire, wherein the corrosion-resistant aluminum wire is located at the inner layer attached to the steel core and the outer layer of the corrosion-resistant steel-core overhead wire, so as to protect the inner layer from contact corrosion and the outer layer from corrosion under a severe corrosion condition.
Example 7
In this embodiment, the corrosion-resistant aluminum wire and the bare aluminum wire are twisted together to obtain the corrosion-resistant overhead wire, wherein the bare aluminum wire is located on the outer layer of the corrosion-resistant overhead wire, and then the bare aluminum wire on the outer layer is subjected to oxidation treatment to enable the outer layer to be oxidizedA thicker hard corrosion-resistant ceramic film layer is generated on the surface layer of the bare aluminum wire, and the specific method can refer to the method disclosed in patent CN 2022115220935: under the traction of a traction device, enabling the corrosion-resistant overhead line prepared in the step (3) to pass through a thermoelectric chemical oxidation plating tank to enable the surface layer of the outer-layer bare aluminum wire to generate a hard corrosion-resistant ceramic film layer; the thermoelectric chemical oxidation plating tank is a double-plating tank system and comprises two mutually independent plating tanks, wherein an electrode is arranged in each plating tank, each plating tank is connected with an independent electrolyte circulating system, and the electrodes of the two plating tanks are respectively connected with a thermoelectric chemical oxidation power supply. The hard corrosion-resistant ceramic film layer comprises an inner layer and an outer layer, wherein the inner layer is a compact layer, the outer layer is a loose porous layer, and the main component in the hard corrosion-resistant ceramic film layer is Al 2 O 3 And alpha-Al 2 O 3 In total Al 2 O 3 The proportion of the components is 40 to 60 percent. The used thermoelectric chemical oxidation power supply is a bidirectional high-frequency pulse power supply, the voltage is 400-800V, the frequency is 900Hz, the working mode of the thermoelectric chemical oxidation power supply is a constant current mode, and the current density is 8A/dm 2 The speed of the air line through the electrolyte was 20 min/m.
Claims (10)
1. A preparation method of an overhead line with a corrosion-resistant ceramic film layer is characterized by comprising the following steps:
(1) Under the traction of a traction device, an aluminum wire passes through a thermoelectric chemical oxidation plating tank which is a double plating tank system and comprises two mutually independent plating tanks, wherein an electrode is arranged in each plating tank, each plating tank is connected with an independent electrolyte circulating system, and the electrodes of the two plating tanks are respectively connected with a thermoelectric chemical oxidation power supply;
(2) After the aluminum wire passes through the double plating tank system, generating a corrosion-resistant ceramic film layer on the surface layer of the aluminum wire, and airing to obtain the corrosion-resistant aluminum wire;
(3) And twisting the corrosion-resistant aluminum wire to obtain the corrosion-resistant overhead wire.
2. The method of claim 1, wherein the corrosion resistant ceramic membrane layer has a thickness of 15 μm or less.
3. The method of claim 1, wherein the aluminum wire has a diameter of 1-5mm, the thermoelectric chemical oxidation power source is a bidirectional high-frequency pulse power source, and the power source operates in a constant current mode, has a voltage of 400-800V, a frequency of 400-900Hz, and a current density of 0.5-3A/dm 2 The electrolyte is silicate system electrolyte, the concentration of silicate in the electrolyte is 1-10g/L, and the speed of the aluminum wire passing through the electrolyte is 5-20 min/m.
4. The method of claim 3, wherein the aluminum wire has a diameter of 4.2mm, the frequency is 600Hz, and the current density is 0.8A/dm 2 The concentration of silicate in the electrolyte is 8g/L, the speed of the aluminum wire passing through the electrolyte is 8 min/m, and the thickness of the ceramic film layer is 4-6 μm.
5. The method of claim 1, wherein step (3) comprises: and twisting the corrosion-resistant aluminum wire and the bare aluminum wire together to obtain the corrosion-resistant overhead wire, wherein the corrosion-resistant aluminum wire is positioned on the outer layer of the corrosion-resistant overhead wire.
6. The method of claim 1, wherein step (3) comprises: and twisting the corrosion-resistant aluminum wire and the steel core together to obtain the corrosion-resistant steel core overhead wire.
7. The method of claim 1, wherein step (3) comprises: and twisting the corrosion-resistant aluminum wire and the steel core together to obtain the corrosion-resistant steel core overhead wire, wherein the corrosion-resistant aluminum wire is positioned in an inner layer attached to the steel core.
8. The method of claim 1, wherein step (3) comprises: and twisting the corrosion-resistant aluminum wire and the steel core together to obtain the corrosion-resistant steel core overhead wire, wherein the corrosion-resistant aluminum wire is positioned on the inner layer attached to the steel core and the outer layer of the corrosion-resistant steel core overhead wire.
9. The method of claim 1, wherein step (3) comprises: twisting the corrosion-resistant aluminum wire and the bare aluminum wire together to obtain a corrosion-resistant overhead wire, wherein the bare aluminum wire is positioned on the outer layer of the corrosion-resistant overhead wire;
further comprising the step (4): under the traction of a traction device, enabling the corrosion-resistant overhead line prepared in the step (3) to pass through a thermoelectric chemical oxidation plating pool to enable the surface layer of the outer-layer bare aluminum wire to generate a hard corrosion-resistant ceramic film layer;
the thermoelectric chemical oxidation plating tank is a double-plating tank system and comprises two mutually independent plating tanks, wherein an electrode is arranged in each plating tank, each plating tank is connected with an independent electrolyte circulating system, and the electrodes of the two plating tanks are respectively connected with a thermoelectric chemical oxidation power supply;
the hard corrosion-resistant ceramic film layer comprises an inner layer and an outer layer, wherein the inner layer is a compact layer, the outer layer is a loose porous layer, and the main component in the hard corrosion-resistant ceramic film layer is Al 2 O 3 And alpha-Al 2 O 3 In total Al 2 O 3 The proportion of the ingredients is 40 to 60 percent.
10. The method of claim 9, wherein the thermoelectric chemical oxidation power source is a bi-directional high frequency pulsed power source with a voltage of 400-800V and a frequency of 900Hz, and wherein the thermoelectric chemical oxidation power source operates in a constant current mode with a current density of 8A/dm 2 The speed of the corrosion-resistant overhead line through the electrolyte is 20 min/m.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211701203.4A CN115938691A (en) | 2022-12-28 | 2022-12-28 | Preparation method of overhead line with corrosion-resistant ceramic film layer |
| PCT/CN2022/143832 WO2024138606A1 (en) | 2022-12-28 | 2022-12-30 | Aluminum-based flexible ceramic coating with bending and corrosion resistance, overhead line and preparation method therefor |
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| CN202211701203.4A CN115938691A (en) | 2022-12-28 | 2022-12-28 | Preparation method of overhead line with corrosion-resistant ceramic film layer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118087000A (en) * | 2024-04-26 | 2024-05-28 | 诸暨市中俄联合材料实验室 | Micro-arc oxidation/thermoelectric chemical oxidation method of non-valve metal |
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- 2022-12-28 CN CN202211701203.4A patent/CN115938691A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118087000A (en) * | 2024-04-26 | 2024-05-28 | 诸暨市中俄联合材料实验室 | Micro-arc oxidation/thermoelectric chemical oxidation method of non-valve metal |
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