Preparation method for super-lubricating Anti-icing aluminum wire

Abstract

The present invention belongs to the technical field of anti-corrosive and anti-icing wires. Disclosed is a preparation method for a super-lubricating anti-icing aluminum wire. By using an aluminum wire as an anode, and a stainless steel plate as a cathode, the cathode and the anode are connected to a direct-current power source via wires, and are then placed in an electrolyte for anodization, so as to obtain an anodized wire; and the wire is immersed in a perfluorooctyl triethoxysilane-ethanol solution, and is then placed in an oven for curing, so as to obtain an anti-icing surface. By regulating and controlling the concentrations of chloride ions and glycerol in the present invention, the competitive reaction of chloride ions is reduced, such that aluminum ions can participate in an oxidation reaction more easily; in addition, the hardness and wear resistance of an oxidation film layer are improved, which facilitates forming a uniform oxidation film layer having a large pore diameter on the aluminum wire, thereby increasing the smoothness, reducing the roughness, improving the hydrophilicity, and reducing the surface energy, thus reducing the ice adhesion strength of the surface of the wire.

Description

A method for preparing super-lubricating anti-icing aluminum conductor Technical Field

[0001] The invention belongs to the technical field of conductor anti-corrosion and anti-icing, and particularly relates to a method for preparing a super-lubricating anti-icing aluminum conductor. Background Art

[0002] Anodic oxidation is the process of forming an oxide film on the surface of an electrolyte solution under an applied electric field, with the workpiece acting as the anode. The corresponding cathode is a conductive material that is stable in the electrolyte, such as stainless steel. DC anodizing is the most widely used, with common electrolytes such as oxalic acid and phosphoric acid. Anodic oxidation can improve the corrosion and icing resistance of aluminum conductors used in power transmission lines. In particular, icing prevention on transmission lines is crucial for the safe operation of power systems. The performance of the anti-icing surface is closely related to the pore structure of the anodic oxide film. However, chloride ions are a common impurity in the electrolyte, and excessive chloride ion concentrations can damage the pore structure. Furthermore, the complex structure of aluminum stranded wire leads to high and uneven anodizing temperatures on the surface of the aluminum conductor. Phosphoric acid electrolytes are highly soluble in the aluminum oxide film, and rising temperatures exacerbate the dissolution of the oxide film, resulting in pore fractures. Consequently, forming a uniform pore structure on the surface of the aluminum conductor during anodizing is often difficult.

[0003] This invention proposes a method for preparing a super-lubricating, ice-resistant aluminum conductor. When the chloride ion concentration in the electrolyte is controlled at 8 mg / L and 10% glycerol is added, a uniform, large-pore oxide film can be formed on the aluminum conductor through anodic oxidation, achieving low ice adhesion strength. Summary of the Invention

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of this application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions should not be used to limit the scope of the present invention.

[0005] In view of the above problems and / or the problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for preparing a super-lubricating anti-icing aluminum conductor.

[0007] To solve the above technical problems, the present invention provides the following technical solution: using an aluminum wire as an anode and a stainless steel plate as a cathode, connecting the cathode and the anode to a DC power supply via a wire, and then placing them in an electrolyte for anodization to obtain an anodized wire;

[0008] The wire is immersed in a perfluorooctyltriethoxysilane-ethanol solution and then placed in an oven for curing to obtain an anti-icing aluminum wire;

[0009] Wherein, the electrolyte is a phosphoric acid solution.

[0010] As a preferred embodiment of the method for preparing the super-lubricating anti-icing aluminum conductor of the present invention, the concentration of the phosphoric acid solution is 0.1-1 mol / L.

[0011] As a preferred embodiment of the method for preparing the super-lubricating anti-icing aluminum wire of the present invention, an additive is added to the electrolyte during the anodizing process, wherein the additive is one of chloride ions and glycerol.

[0012] As a preferred embodiment of the method for preparing the super-lubricating anti-icing aluminum conductor of the present invention, the concentration of the glycerol is 5-15%.

[0013] As a preferred embodiment of the method for preparing the super-lubricating anti-icing aluminum wire of the present invention, the concentration of the chloride ions is 0-8 mg / L.

[0014] As a preferred embodiment of the method for preparing the super-lubricating anti-icing aluminum wire of the present invention, the current during the oxidation process is 19 A and the oxidation time is 20 min.

[0015] As a preferred embodiment of the method for preparing the super-lubricating anti-icing aluminum conductor of the present invention, the concentration of the perfluorooctyltriethoxysilane-ethanol solution is 1-3 wt %.

[0016] As a preferred embodiment of the method for preparing the super-lubricating anti-icing aluminum conductor of the present invention, the conductor is immersed in a perfluorooctyltriethoxysilane-ethanol solution for 30-60 minutes.

[0017] As a preferred embodiment of the method for preparing the super-lubricating anti-icing aluminum conductor of the present invention, the conductor is placed in an oven at 90° C. for curing and modification for 30-60 minutes.

[0018] Another object of the present invention is to provide a super-lubricating anti-icing aluminum conductor.

[0019] Beneficial effects of the present invention:

[0020] The present invention regulates the concentrations of chloride ions and glycerol to reduce the competitive reaction of chloride ions, making it easier for aluminum ions to participate in the oxidation reaction. At the same time, the hardness and wear resistance of the oxide film are improved, which helps to form a uniform oxide film with a large pore size on the aluminum conductor, thereby increasing smoothness, reducing roughness, improving hydrophilicity, and reducing surface energy, thereby reducing the ice adhesion strength on the conductor surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

[0022] Figure 1 shows the macroscopic morphology of the aluminum wire surface under different chloride ion concentrations.

[0023] Figure 2 shows the microscopic morphology of the aluminum wire surface under different chloride ion concentrations.

[0024] Figure 3 shows the microscopic morphology of the aluminum wire surface after adding glycerol.

[0025] Figure 4 shows the ice adhesion strength of aluminum conductors under different preparation processes. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the embodiments of the specification.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0029] The aluminum conductor used in the present invention complies with the national standard GB / T 1197-2017, parameters: JL / LB 120 / 20;

[0030] The stainless steel plate used is made of 304 stainless steel, consists of six stainless steel sheets with a size of 50 cm×7 cm, and has a ring shape.

[0031] When measuring the ice adhesion strength of the wire surface in the present invention, a homemade polytetrafluoroethylene mold is used, and there are arc-shaped grooves on both sides of the mold, and the diameter of the groove is the same as the outer diameter of the aluminum wire. The mold is placed in a refrigerator at -20°C, and the aluminum wire is placed on the mold with water added so that the wire is partially in contact with the water. After the water is completely frozen (about 1.0h), the ice adhesion strength of the wire is measured. Specifically, the mold is gently pushed with a force sensor, and the maximum thrust is recorded. The ice adhesion strength is calculated by dividing the thrust by the contact area.

[0032] Micromorphology test: The micromorphology was measured using a Zeiss Auriga field emission scanning electron microscope (SEM) produced by Zeiss.

[0033] Example 1

[0034] This embodiment provides a method for preparing a super-lubricating anti-icing aluminum conductor, specifically comprising:

[0035] 1) Ultrasonic clean the aluminum wire with alcohol and deionized water. Soak the cleaned aluminum wire in a 1 mol / L NaOH solution for 2 minutes to remove the surface oxide layer. Then, rinse the residual alkaline solution on the wire surface with deionized water.

[0036] 2) An aluminum wire was used as the anode and a stainless steel plate was used as the cathode. The cathode and anode were connected to a DC power supply via wires and then placed in a 0.3 mol / L phosphoric acid solution and anodic oxidation was performed at a current of 19 A for 20 min. The chloride ion concentration was controlled to 8 mg / L.

[0037] 3) adding 10% glycerol additive to the phosphoric acid electrolyte;

[0038] 4) Immerse the wire in a 2 wt% perfluorooctyltriethoxysilane-ethanol solution for 30 minutes;

[0039] 5) The aluminum wire was placed in an oven at 90° C. to cure the modifying agent for 60 minutes, thereby obtaining the aluminum wire of this embodiment.

[0040] Example 2

[0041] The difference between this embodiment and embodiment 1 is that 8% glycerol additive is added to the phosphoric acid electrolyte. The rest of the preparation method is the same as that of embodiment 1 to obtain the aluminum wire of this embodiment.

[0042] Example 3

[0043] The difference between this embodiment and embodiment 1 is that a 12% glycerol additive is added to the phosphoric acid electrolyte. The rest of the preparation method is the same as that of embodiment 1 to obtain the aluminum wire of this embodiment.

[0044] Example 4

[0045] The difference between this embodiment and embodiment 1 is that a 15% glycerol additive is added to the phosphoric acid electrolyte. The rest of the preparation method is the same as that of embodiment 1 to obtain the aluminum wire of this embodiment.

[0046] Example 5

[0047] The difference between this embodiment and embodiment 1 is that a 5% glycerol additive is added to the phosphoric acid electrolyte. The rest of the preparation method is the same as that of embodiment 1 to obtain the aluminum wire of this embodiment.

[0048] The ice adhesion strength test was performed on the surfaces of the aluminum wires prepared in Examples 1 to 5. The results are shown in Table 1.

[0049] Table 1 Ice adhesion strength results of aluminum conductors prepared by adding glycerol additives at different concentrations

[0050] From Table 1, we can see that:

[0051] Comparative results show that when a 10% glycerol additive is added to a phosphoric acid electrolyte with a chloride ion concentration of 8 mg / L, the aluminum wire surface exhibits a relatively uniform pore structure, with no pore dissolution cracking, and ice adhesion strength reaches its lowest level. This is because glycerol forms a dense organic film on the surface of the oxide film, filling the pores in the film. This increases the film's density and growth rate, making it thicker and improving its hardness and wear resistance.

[0052] Comparative Example 1

[0053] Comparative Example 1 is based on Example 1. The difference between Comparative Example 1 and Example 1 is that the chloride ion concentration is controlled to 4 mg / L; glycerol additive is not added to the phosphoric acid electrolyte. The rest of the preparation method is the same as that of Example 1 to obtain the aluminum wire of this embodiment.

[0054] Comparative Example 2

[0055] Comparative Example 2 is based on Example 1. The differences between Comparative Example 2 and Example 1 are: the chloride ion concentration is controlled to 6 mg / L; glycerol additive is not added to the phosphoric acid electrolyte; the rest of the preparation method is the same as Example 1, and the aluminum wire of this embodiment is obtained.

[0056] Comparative Example 3

[0057] Comparative Example 3 is based on Example 1. The difference between Comparative Example 3 and Example 1 is that glycerol additive is not added to the phosphoric acid electrolyte. The rest of the preparation method is the same as that of Example 1 to obtain the aluminum wire of this example.

[0058] The ice adhesion strength test was performed on the aluminum wire surfaces obtained in Comparative Examples 1 to 3 and compared with Example 1. The results are shown in Table 2.

[0059] Table 2 Ice adhesion strength results of aluminum conductors obtained by controlling different chloride ion concentrations

[0060] From Table 2, we can see that:

[0061] Comparative results show that without the addition of glycerol, the aluminum wire surface exhibits significantly increased ice adhesion strength. When the chloride ion concentration ranges from 0-8 mg / L, the aluminum wire surface exhibits a relatively uniform, undulating pore structure. At chloride ion concentrations between 9-15 mg / L, white spots appear on the surface, and a fibrous microstructure develops. When the chloride ion concentration exceeds 15 mg / L, the white spots increase and bulges form, the surface easily sloughs, and a fluffy, disordered tubular structure develops, with incomplete and easily broken pore walls. When the chloride ion concentration does not exceed 8 mg / L, the oxidized wire forms a uniform, flawless macrostructure and a relatively uniform microstructure. However, microscopic appearance reveals some cracked pore walls, due to the strong solubility of the phosphoric acid electrolyte in the aluminum oxide film on the aluminum wire surface.

[0062] Comparative Example 4

[0063] Comparative Example 4 is based on Example 1. The differences between Comparative Example 4 and Example 1 are: the chloride ion concentration is controlled to 14 mg / L; a 10% concentration of glycerol additive is added to the phosphoric acid electrolyte. The rest of the preparation method is the same as that of Example 1 to obtain the aluminum wire of this example.

[0064] Comparative Example 5

[0065] Comparative Example 4 is based on Example 1. The differences between Comparative Example 4 and Example 1 are: the chloride ion concentration is controlled to 20 mg / L; a 10% concentration of glycerol additive is added to the phosphoric acid electrolyte. The rest of the preparation method is the same as that of Example 1 to obtain the aluminum wire of this example.

[0066] The ice adhesion strength test was performed on the aluminum wire surfaces obtained in Comparative Examples 4 to 5 and compared with Example 1. The results are shown in Table 3.

[0067] Table 3 Ice adhesion strength results of aluminum conductors obtained by controlling different chloride ion concentrations

[0068] From Table 3, we can see that:

[0069] From the comparison results, it can be seen that when the concentration of chloride ions is too high, the ice adhesion strength on the surface of the aluminum wire is significantly increased. This is because chloride ions will form chloride ions with water molecules during the freezing process. These ions will interact with the water molecules in the ice lattice, making the morphology of the ice lattice more ordered, increasing the crystallinity and adhesion of the ice. When the concentration of chloride ions is too high, the number of its combinations with water molecules increases, thereby increasing the adhesion of the ice, which will cause the ice formed on the aluminum wire to adhere more firmly and make it difficult to peel off the ice, thereby increasing the ice adhesion strength.

[0070] In the scheme of Example 1, the chloride ion concentration is controlled at 8 mg / L, and a 10% glycerol additive is added to the electrolyte. At this time, the chloride ions can improve the selectivity of the oxidation reaction, making the growth of the oxide film more uniform. The glycerol changes the kinetics of the oxidation reaction, and can also improve the density of the oxide film and reduce the formation of pores, thereby increasing the pore size of the oxide film, thereby increasing smoothness, reducing roughness, improving hydrophilicity, reducing surface energy, and reducing the ice adhesion strength on the wire surface.

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A preparation method of a super-lubricating and anti-icing aluminum conductor, characterized in that: including, using an aluminum wire as the anode and a stainless steel plate as the cathode, connecting the cathode and the anode to a DC power supply through a wire, and then placing them in an electrolyte for anodization to obtain an anodized wire; immersing the wire in a perfluorooctyltriethoxysilane-ethanol solution, and then placing it in an oven for curing to obtain an ice-proof aluminum wire; wherein, the electrolyte is a phosphoric acid solution.

2. The preparation method of the superlubricating anti-icing aluminum conductor according to claim 1, wherein: The concentration of the phosphoric acid solution is 0.1-1 mol / L.

3. The preparation method of the superlubricant anti-icing aluminum conductor according to claim 1, characterized in that: During the anodization process, an additive is added to the electrolyte, wherein the additive is one of chloride ions and glycerol.

4. The preparation method of the super-lubricating anti-icing aluminum conductor according to claim 1, characterized in that: The concentration of the glycerol is 5-15%.

5. The preparation method of the superlubricant anti-icing aluminum conductor according to claim 4, characterized in that: The concentration of the chloride ions is 0-8 mg / L.

6. The preparation method of the super-lubricating anti-icing aluminum conductor according to claim 1, characterized in that: The current during the oxidation process is 19 A, and the oxidation time is 20 min.

7. The preparation method of the superlubricant anti-icing aluminum conductor according to claim 1, characterized in that: The concentration of the perfluorooctyltriethoxysilane-ethanol solution is 1-3 wt%.

8. The preparation method of the superlubricating anti-icing aluminum conductor according to claim 8, characterized in that: Placing it in the perfluorooctyltriethoxysilane-ethanol solution and soaking for 30-60 min.

9. The preparation method of the superlubricating anti-icing aluminum conductor according to claim 1, wherein: Placing it in an oven at 90°C for curing and modification for 30-60 min.

10. A superlubricating ice-proof aluminum wire prepared by the method according to any one of claims 1 to 9.

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