A wear-resistant coating for steel wire rings and its coating method

Abstract

This invention provides a wear-resistant coating for steel wire rings and its coating method, relating to the field of wear-resistant coating technology. The process involves sequentially depositing a pure nickel-phosphorus alloy underlayer and a nickel-phosphorus composite functional layer within a plating solution. The specific implementation steps are: Step 1, pretreatment of the steel wire ring substrate; Step 2, preparation of the basic electroless nickel-phosphorus plating solution; Step 3, underlayer deposition; Step 4, in-situ composite deposition of the functional layer; and Step 5, low-temperature heat treatment. During the continuous deposition process with a single plating solution, a combination of plating solution circulation filtration and continuous mechanical stirring is employed. The coating adopts a double-layer gradient structure of a pure nickel-phosphorus alloy underlayer and a nickel-phosphorus alloy composite functional layer, which effectively improves particle dispersion and adhesion, avoids particle agglomeration, and synergistically enhances the bonding strength and wear resistance between the coating and the substrate. The continuous deposition process with a single plating solution simplifies the production process, reduces impurity contamination, and ensures uniform coating composition and smooth gradient transitions.

Description

Technical Field

[0001] This invention relates to the field of wear-resistant coating technology, specifically to a wear-resistant coating for steel wire rings and its coating method. Background Technology

[0002] The steel traveler of a spinning machine is a core and easily damaged component in the spinning process of the textile industry. During its service life, it needs to continuously rub against the yarn at high speed. At the same time, it is in the complex environment of high humidity and high fiber dust in the spinning workshop for a long time, which makes it prone to problems such as coating wear, peeling, and corrosion. This leads to a shortened service life of the steel traveler. Frequent replacement not only increases production costs, but also affects spinning production efficiency and product quality.

[0003] Currently, wear-resistant protection for ring spinning machine travelers mainly employs a single nickel-phosphorus alloy plating or a simple particle composite plating. Existing technologies suffer from the following core defects: First, the plating lacks a gradient design, resulting in insufficient bonding strength between the bottom layer and the substrate, uneven wear resistance of the functional layers, and a tendency for interlayer delamination. Second, poor particle dispersion, due to ineffective modification or unreasonable modification processes, leads to particle agglomeration, affecting the overall performance of the plating. Third, the coating process is complex, often employing multi-solution step-by-step deposition, requiring frequent solution changes, increasing process complexity, and easily introducing impurities, leading to unstable plating quality. Fourth, the process parameters are poorly designed, often using single-point precise parameters, resulting in poor versatility, and some parameters lack practical industrial application basis, making large-scale production difficult. Fifth, the coating's corrosion resistance and wear resistance synergistic performance are insufficient, failing to meet the service requirements of long-term high-speed friction and high-humidity corrosion of ring spinning machine travelers. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, there is an urgent need to develop a wear-resistant coating for steel wire rings of spinning machines with simple process, excellent coating performance, reasonable protection range, and the ability to take into account bonding strength, wear resistance and corrosion resistance, so as to solve the technical bottlenecks in the existing technology. The purpose of this invention is to propose a wear-resistant coating for steel wire rings and its coating method.

[0005] A wear-resistant coating for steel wire rings, the coating being composed of a pure nickel-phosphorus alloy underlayer and a nickel-phosphorus alloy-based composite functional layer bonded together in sequence;

[0006] The functional layer contains diffusely distributed spherical silicon carbide hard wear-resistant particles with double-modified surfaces. The particle mass percentage gradually increases from 3.8wt%-4.2wt% near the bottom layer to 5.8wt%-6.2wt% on the surface of the functional layer along the thickness direction.

[0007] The phosphorus content of the bottom layer is controlled at 10.0wt%-10.4wt%, and the phosphorus content of the functional layer is 10.3wt%-11.0wt%. The phosphorus content from the bottom layer to the functional layer shows a continuous increasing gradient distribution. The coating is prepared by continuous deposition of a single plating solution.

[0008] The bottom layer and the functional layer are formed continuously in the same plating solution, and the phosphorus content gradient and the particle gradient are formed synchronously.

[0009] Furthermore, the spherical silicon carbide particles are modified by both plasma etching and silane coupling agent KH550. After the particle modification is completed, they are then subjected to centrifugal separation and drying treatment in an inert gas atmosphere.

[0010] Furthermore, the thickness of the pure nickel-phosphorus alloy base layer is 6.5μm-7.5μm, the thickness of the functional layer is 11.5μm-12.5μm, and the total thickness of the coating is 19.5μm-20.5μm.

[0011] Furthermore, a method for coating a wear-resistant coating on a steel wire ring involves using only a single basic electroless nickel-phosphorus plating solution. The plating solution is not changed or the plating process is not interrupted throughout the entire process. Within this solution, a pure nickel-phosphorus alloy underlayer is deposited sequentially, followed by a nickel-phosphorus composite functional layer. This achieves a linear gradient distribution of spherical silicon carbide particles within the functional layer and a continuously increasing gradient distribution of phosphorus content between the underlayer and the functional layer. The specific implementation steps are as follows:

[0012] Step 1: Pre-treatment of the steel wire ring substrate;

[0013] Step 2: Preparation of basic electroless nickel-phosphorus plating solution;

[0014] Step 3, bottom layer deposition;

[0015] Step 4: In-situ composite deposition of functional layers;

[0016] Step 5: Low-temperature heat treatment;

[0017] In the continuous deposition process of a single plating solution, a combination of plating solution circulation filtration and continuous mechanical stirring is adopted.

[0018] Furthermore, the outer surface roughness of the composite functional layer is 0.17μm-0.19μm, and the bonding strength between the coating and the substrate is 37MPa-39MPa.

[0019] Furthermore, the substrate pretreatment involves sequential alkaline washing to remove oil, deionized water rinsing, sulfuric acid pickling to remove rust, deionized water rinsing, and dilute hydrochloric acid activation treatment, with deionized water rinsing performed after each step.

[0020] Furthermore, the basic electroless nickel-phosphorus plating solution contains nickel sulfate, sodium hypophosphite, sodium citrate, and sodium acetate. The initial pH value of the plating solution is adjusted to 4.9-5.1, and the pH fluctuation of the plating solution is controlled within ≤±0.1.

[0021] Furthermore, the mold pretreatment step is as follows: the particle dispersion suspension containing spherical silicon carbide particles and dispersant used in the functional layer deposition is ultrasonically dispersed, and then a single plating solution is continuously added at a uniform speed using a peristaltic pump. During the addition process, ultrasonic vibration and mechanical stirring are applied simultaneously.

[0022] Furthermore, the low-temperature heat treatment is carried out under industrial nitrogen protection, with a heating rate of 7.5℃ / min-8.5℃ / min. After heating to 175℃-185℃, the temperature is held constant for 1.4h-1.6h, and then cooled to room temperature in the furnace at a rate of 2℃ / min.

[0023] Furthermore, the plating temperature for both the bottom layer and the functional layer is 84℃-86℃. After the bottom layer is deposited to a thickness of 6.8μm-7.2μm, the functional layer is deposited directly in the same plating solution until the thickness reaches 11.8μm-12.2μm.

[0024] Beneficial effects:

[0025] The coating adopts a double-layer gradient structure of a pure nickel-phosphorus alloy base layer and a nickel-phosphorus alloy-based composite functional layer. The phosphorus content of the base layer and the functional layer is distributed in a continuously increasing gradient. The spherical silicon carbide particles in the functional layer are distributed in a linear gradient. Combined with plasma etching and dual modification with silane coupling agent KH550, as well as centrifugation treatment with specific parameters, the particle dispersion and bonding force can be effectively improved, particle agglomeration can be avoided, and the bonding strength and wear resistance of the coating and the substrate can be synergistically improved. The single plating solution continuous deposition process simplifies the production process, reduces impurity contamination, and ensures uniform coating composition and smooth gradient connection. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the embodiments will be briefly described below. As is obvious, the accompanying drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0027] Figure 1 This is a process flow diagram of the present invention. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] like Figure 1The diagram illustrates a wear-resistant coating for steel wire rings, the coating comprising a pure nickel-phosphorus alloy underlayer and a nickel-phosphorus alloy-based composite functional layer sequentially bonded together.

[0030] The functional layer contains diffusely distributed spherical silicon carbide hard wear-resistant particles with double-modified surfaces. The particle mass percentage gradually increases from 3.8wt%-4.2wt% near the bottom layer to 5.8wt%-6.2wt% on the surface of the functional layer along the thickness direction.

[0031] The phosphorus content of the bottom layer is controlled at 10.0wt%-10.4wt%, and the phosphorus content of the functional layer is 10.3wt%-11.0wt%. The phosphorus content from the bottom layer to the functional layer shows a continuous increasing gradient distribution. The coating is prepared by continuous deposition of a single plating solution.

[0032] The bottom layer and the functional layer are formed continuously in the same plating solution, and the phosphorus content gradient and the particle gradient are formed synchronously.

[0033] It should be noted that the parameter settings are based on the service wear resistance requirements of the spinning machine's traveler, combined with the process characteristics of continuous deposition using a single plating solution, to determine the gradient range of particle and phosphorus content and the coating preparation method. Specifically, the preferred parameters are a purity of 99.9% for spherical silicon carbide particles and a dual modification method using plasma etching and silane coupling agent KH550. The technical benefits are that the spherical silicon carbide particles are prepared by vapor deposition, which can precisely control the particle size and sphericity, avoiding the impact of uneven particle morphology on the gradient distribution of the functional layer. Continuous deposition using a single plating solution eliminates the need to change the plating solution, reducing process complexity and avoiding contamination from impurities generated during solution changes, ensuring a smooth gradient connection between the bottom layer and the functional layer. The phosphorus content gradient and particle gradient are achieved through a specific component ratio of the single plating solution and the deposition process. The synergy of these two factors can balance the bonding strength and wear resistance of the coating, adapting to the service requirements of the spinning machine's traveler.

[0034] As an optional embodiment, the spherical silicon carbide particles are modified by both plasma etching and silane coupling agent KH550. After the particle modification is completed, they are then subjected to centrifugal separation and drying treatment in an inert gas atmosphere.

[0035] It should be noted that the parameter settings are based on ensuring the particle modification effect and subsequent dispersibility in the plating solution, combined with the feasibility of industrial production, to determine the dual modification process and drying atmosphere. Specifically, the preferred parameters are: plasma etching power controlled at 100-120W, silane coupling agent KH550 ethanol solution concentration controlled at 2%-3%, and centrifugal separation speed controlled at 2800-3200 r / min. The technical effect is that the specific steps of dual modification are: placing spherical silicon carbide particles into a plasma etching device, etching under an inert gas atmosphere to remove impurities from the particle surface and improve surface activity; then immersing the etched particles in the aforementioned concentration of silane coupling agent KH550 ethanol solution, stirring, rinsing, and then centrifuging and drying at a speed of 2800-3200 r / min. The centrifugal separation speed and drying time are set according to actual production needs. Inert gas drying can avoid particle surface oxidation, ensure the modification effect, and provide a guarantee for uniform dispersion of particles in a single plating solution. Argon is the preferred inert gas.

[0036] As an optional embodiment, the thickness of the pure nickel-phosphorus alloy underlayer is 6.5μm-7.5μm, the thickness of the functional layer is 11.5μm-12.5μm, and the total thickness of the coating is 19.5μm-20.5μm.

[0037] It should be noted that the parameter settings are based on the service wear requirements and dimensional tolerances of the wire traveler of the spinning machine, taking into account the coating bonding strength and assembly compatibility, to determine the thickness range of each layer and the total thickness. The specific preferred parameters are: bottom layer thickness 6.5μm-7.5μm, functional layer thickness 11.5μm-12.5μm, and total thickness 19.5μm-20.5μm, which can be finely adjusted within this range according to actual assembly requirements. The technical effect is that the bottom layer thickness ensures the reliability of the bonding with the substrate, the functional layer thickness meets the wear resistance requirements, and the total thickness is adapted to the wire traveler assembly size to ensure tight interlayer bonding and prevent interlayer peeling during use.

[0038] As an optional embodiment, a coating method for a wear-resistant coating on a steel wire ring involves using only a single basic electroless nickel-phosphorus plating solution. The plating solution is not changed and the plating process is not interrupted throughout the entire process. Within this solution, a pure nickel-phosphorus alloy underlayer is deposited sequentially, followed by a nickel-phosphorus composite functional layer. This achieves a linear gradient distribution of spherical silicon carbide particles within the functional layer and a continuously increasing gradient distribution of phosphorus content between the underlayer and the functional layer. The specific implementation steps are as follows:

[0039] Step 1: Pre-treatment of the steel wire ring substrate;

[0040] Step 2: Preparation of basic electroless nickel-phosphorus plating solution;

[0041] Step 3, bottom layer deposition;

[0042] Step 4: In-situ composite deposition of functional layers;

[0043] Step 5: Low-temperature heat treatment;

[0044] In the continuous deposition process of a single plating solution, a combination of plating solution circulation filtration and continuous mechanical stirring is adopted.

[0045] It should be noted that the parameter settings are based on the goal of simultaneously preparing a dual-gradient coating using a single plating solution, simplifying the process and improving coating quality. Combined with industrial production efficiency, the plating solution usage, process steps, and auxiliary measures were determined. Specifically, the optimal parameters are: no change of plating solution and uninterrupted plating throughout the process, supplemented by plating solution circulation filtration and continuous mechanical stirring. The technical benefits are: the preparation of a single base plating solution ensures consistency of the plating solution components; no change of plating solution and uninterrupted plating throughout the process avoids coating defects caused by process interruptions, improving production efficiency; the combination of plating solution circulation filtration and mechanical stirring can promptly remove phosphate byproducts generated from the bottom layer deposition, preventing byproduct accumulation from affecting the stability of the plating solution and the formation of the functional layer gradient. Each step is sequentially connected to form a complete coating process system, ensuring the precise realization of the dual gradient.

[0046] As an optional embodiment, the outer surface roughness of the composite functional layer is 0.17μm-0.19μm, and the bonding strength between the coating and the substrate is 37MPa-39MPa.

[0047] It should be noted that the parameter settings are based on a balance of coating wear resistance, yarn friction resistance, and interlayer bonding reliability, combined with the long-term service requirements of the ring spinning machine's traveler, to determine the range of surface roughness and bonding strength. Specifically, the preferred parameters are an outer surface roughness of 0.17μm-0.19μm, a coating-substrate bonding strength of 37MPa-39MPa, and a salt spray corrosion resistance time of 47.8h-48.2h. The technical effect is that the outer surface roughness reduces frictional damage between the traveler and the yarn while ensuring the coating's wear resistance life. The bonding strength is achieved through optimizing the deposition process of the underlayer and functional layers, as well as the particle modification effect, which can meet the long-term service requirements of the ring spinning machine's traveler. The coating's salt spray corrosion resistance time of 47.8h-48.2h further improves the coating's service stability.

[0048] As an optional embodiment, the substrate pretreatment sequentially includes alkaline washing to remove oil, deionized water rinsing, sulfuric acid pickling to remove rust, deionized water rinsing, and dilute hydrochloric acid activation treatment, with deionized water rinsing performed after each step.

[0049] It should be noted that the parameter settings are based on removing oil, oxide scale, and impurities from the substrate surface, enhancing the surface activity of the substrate, and laying the foundation for subsequent plating. The pretreatment steps are determined in conjunction with the characteristics of the substrate material. The specific optimized parameters are that the pretreatment steps are as follows: alkaline washing for degreasing, deionized water rinsing, sulfuric acid pickling for rust removal, deionized water rinsing, and dilute hydrochloric acid activation treatment, with each step accompanied by deionized water rinsing. The technical effect is that alkaline washing for degreasing can thoroughly remove oil from the substrate surface, acid pickling for rust removal can effectively remove oxide scale, and dilute hydrochloric acid activation treatment can remove residual oxide film after acid pickling. Each rinsing step uses deionized water to prevent impurities from being carried into subsequent processes, ensuring the pretreatment effect and ensuring a tight bond between the plating layer and the substrate.

[0050] As an optional embodiment, the basic electroless nickel-phosphorus plating solution contains nickel sulfate, sodium hypophosphite, sodium citrate, and sodium acetate. The initial pH value of the plating solution is adjusted to 4.9-5.1, and the pH fluctuation of the plating solution is controlled within ≤±0.1.

[0051] It should be noted that the parameter settings are based on ensuring the stability of the plating solution and achieving precise deposition of phosphorus content gradients. Combining the principles of chemical plating, the components and pH range of the plating solution are determined. Specifically, the preferred parameters are: the plating solution contains nickel sulfate, sodium hypophosphite, sodium citrate, and sodium acetate; the initial pH is 4.9-5.1; pH fluctuation is ≤±0.1; and it is preferred to monitor the pH throughout the process using an online pH monitor. The technical benefits are: nickel sulfate serves as the source of nickel ions, and sodium hypophosphite acts as a reducing agent, ensuring sufficient reduction of nickel ions; sodium citrate and sodium acetate act as complexing agents, preventing nickel ion precipitation and ensuring plating solution stability; real-time pH adjustment via an online pH monitor ensures plating solution stability and provides a guarantee for dual-gradient deposition.

[0052] As an optional embodiment, the mold pretreatment step is as follows: the particle dispersion suspension containing spherical silicon carbide particles and dispersant used in the functional layer deposition is ultrasonically dispersed, and then a single plating solution is continuously added at a uniform speed using a peristaltic pump. During the addition process, ultrasonic vibration and mechanical stirring are applied simultaneously.

[0053] It should be noted that the parameter settings are based on ensuring uniform particle dispersion and a gradient distribution, combined with the particle gradient requirements of the functional layer, to determine the suspension treatment method, replenishment method, and stirring mode. Specifically, the preferred parameters are: sodium dodecyl sulfate as the dispersant, with a dosage range of 0.18–0.22 g / L; and ultrasonic oscillation power controlled at 200–250 W. The technical effect is that the particle suspension containing spherical silicon carbide particles and sodium dodecyl sulfate dispersant, after ultrasonic dispersion at 200–250 W power, ensures uniformity and no sedimentation. The suspension concentration and replenishment rate are set according to the particle gradient requirements of the functional layer to ensure uniform particle gradient. The combination of ultrasonic oscillation and mechanical stirring prevents particle agglomeration, ensures the uniformity of the plating solution, and guarantees the functional layer deposition effect.

[0054] As an optional embodiment, the low-temperature heat treatment is carried out under industrial nitrogen protection, with a heating rate of 7.5℃ / min-8.5℃ / min. After heating to 175℃-185℃, the temperature is held constant for 1.4h-1.6h, and then cooled to room temperature in the furnace at a rate of 2℃ / min.

[0055] It should be noted that the parameter settings are based on avoiding thermal stress in the coating, preventing oxidation, and refining the coating grain size. The heat treatment process parameters are determined in conjunction with the coating material characteristics. The specific preferred parameters are: nitrogen protective atmosphere, heating rate of 7.5℃ / min-8.5℃ / min, constant temperature of 175℃-185℃, holding time of 1.4h-1.6h, and cooling rate of 2℃ / min. The technical effect is that industrial nitrogen protection can isolate the coating from air, prevent oxidation of the coating during heat treatment, and ensure the stability of the coating performance. The setting of heating rate, constant temperature, and holding time can avoid defects such as cracking and peeling of the coating due to thermal stress, while promoting the refinement of the coating grain size, improving the bonding strength and wear resistance of the coating to the substrate, and further reducing thermal stress by furnace cooling, ensuring the dimensional stability of the coating.

[0056] As an optional embodiment, the plating temperature of both the bottom layer and the functional layer is 84℃-86℃. After the bottom layer is deposited to a thickness of 6.8μm-7.2μm, the functional layer is deposited directly in the same plating solution until the thickness reaches 11.8μm-12.2μm.

[0057] It should be noted that the parameter settings are based on ensuring a tight bond between the substrate and the functional layer, ensuring a continuous connection between phosphorus content and particle gradient, and considering the characteristics of a single plating solution deposition process, to determine the plating temperature and the deposition thickness of each layer; the specific preferred parameters are a plating temperature of 84℃-86℃, a substrate deposition thickness of 6.8μm-7.2μm, and a final functional layer thickness of 11.8μm-12.2μm; the technical effect is that using the same plating temperature for the substrate and the functional layer can avoid poor coating bonding caused by temperature fluctuations and ensure a tight connection between layers; after the substrate is deposited to the specified thickness, the functional layer is deposited directly without removing the workpiece, which can reduce oxidation caused by the workpiece being exposed to air, while ensuring a continuous connection between the phosphorus content gradient and the particle gradient and avoiding gradient discontinuity.

[0058] The present invention will be further described in detail below with reference to specific embodiments and comparative examples. The embodiments are all based on the technical solutions described in the claims, and all parameters are selected within the scope defined by the claims. The comparative examples adopt existing conventional technical solutions to compare and verify the superiority of the present invention.

[0059] Example 1

[0060] A wear-resistant coating for steel traveler of a spinning frame and its coating method, with specific parameters as follows:

[0061] Coating structure: The pure nickel-phosphorus alloy base layer has a thickness of 7.0 μm, the nickel-phosphorus alloy-based composite functional layer has a thickness of 12.0 μm, and the total coating thickness is 19.0 μm;

[0062] Functional layer particles: Spherical silicon carbide particles with a surface double-modified (plasma etching power 110W, silane coupling agent KH550 ethanol solution concentration 2.5%), the particle mass percentage gradually increases from 4.0 wt% near the bottom layer to 6.0 wt% on the surface layer;

[0063] Phosphorus content: The phosphorus content in the bottom layer is 10.2 wt%, and the phosphorus content in the functional layer is 10.6 wt%, showing a continuous increasing gradient distribution;

[0064] Coating process: Single basic electroless nickel-phosphorus plating solution (containing nickel sulfate, sodium hypophosphite, sodium citrate, and sodium acetate), initial pH value 5.0, pH value fluctuation ≤ ±0.1; plating temperature 85℃;

[0065] Auxiliary parameters: Dispersant (sodium dodecyl sulfate) dosage in particle dispersion suspension: 0.20 g / L; ultrasonic oscillation power: 220 W; centrifugation speed: 3000 r / min; low temperature heat treatment (industrial nitrogen protection, heating rate: 8.0 ℃ / min, heating to 180 ℃ and holding at that temperature for 1.5 h, cooling rate: 2 ℃ / min).

[0066] Example 2

[0067] A wear-resistant coating for steel traveler of a spinning frame and its coating method, with specific parameters as follows:

[0068] Coating structure: The pure nickel-phosphorus alloy base layer has a thickness of 6.5 μm, the nickel-phosphorus alloy-based composite functional layer has a thickness of 11.5 μm, and the total coating thickness is 18.0 μm;

[0069] Functional layer particles: Spherical silicon carbide particles with a surface double-modified (plasma etching power 100W, silane coupling agent KH550 ethanol solution concentration 2.0%), the particle mass percentage gradually increases from 3.8wt% near the bottom layer to 5.8wt% on the surface layer;

[0070] Phosphorus content: The phosphorus content in the bottom layer is 10.0 wt%, and the phosphorus content in the functional layer is 10.3 wt%, showing a continuously increasing gradient distribution;

[0071] Coating process: Single basic electroless nickel-phosphorus plating solution (containing nickel sulfate, sodium hypophosphite, sodium citrate, and sodium acetate), initial pH value 4.9, pH value fluctuation ≤ ±0.1; plating temperature 84℃;

[0072] Auxiliary parameters: Dispersant (sodium dodecyl sulfate) dosage in particulate dispersion suspension is 0.18 g / L; ultrasonic oscillation power is 200 W; centrifugation speed is 2800 r / min; low temperature heat treatment (industrial nitrogen protection, heating rate is 7.5℃ / min, heating to 175℃ and holding at that temperature for 1.6 h, cooling rate is 2℃ / min).

[0073] Example 3

[0074] A wear-resistant coating for steel traveler of a spinning frame and its coating method, with specific parameters as follows:

[0075] Coating structure: The pure nickel-phosphorus alloy base layer has a thickness of 7.5 μm, the nickel-phosphorus alloy-based composite functional layer has a thickness of 12.5 μm, and the total coating thickness is 20.0 μm;

[0076] Functional layer particles: Spherical silicon carbide particles with a surface double-modified (plasma etching power 120W, silane coupling agent KH550 ethanol solution concentration 3.0%), the particle mass percentage gradually increases from 4.2wt% near the bottom layer to 6.2wt% on the surface layer;

[0077] Phosphorus content: The phosphorus content in the bottom layer is 10.4 wt%, and the phosphorus content in the functional layer is 11.0 wt%, showing a continuous increasing gradient distribution;

[0078] Coating process: Single basic electroless nickel-phosphorus plating solution (containing nickel sulfate, sodium hypophosphite, sodium citrate, and sodium acetate), initial pH value 5.1, pH value fluctuation ≤ ±0.1; plating temperature 86℃;

[0079] Auxiliary parameters: Dispersant (sodium dodecyl sulfate) dosage in particulate dispersion suspension: 0.22 g / L; ultrasonic oscillation power: 250 W; centrifugation speed: 3200 r / min; low temperature heat treatment (industrial nitrogen protection, heating rate: 8.5 ℃ / min, heating to 185 ℃ and holding at that temperature for 1.4 h, cooling rate: 2 ℃ / min).

[0080] Comparative Example

[0081] The existing conventional ring spinning machine traveler coating technology is adopted, with the following specific parameters:

[0082] Coating structure: Single nickel-phosphorus alloy coating, 19.0 μm thick, with no gradient design;

[0083] Functional layer particles: Unmodified spherical silicon carbide particles, uniformly mixed in the coating, with a particle mass percentage of 5.0 wt%.

[0084] Phosphorus content: The total phosphorus content is 10.5 wt%;

[0085] Coating process: A two-step plating solution deposition method is adopted, first depositing the bottom layer, and then replacing the plating solution to deposit the functional layer; the initial pH value of the plating solution is 5.0, and the plating temperature is 85℃;

[0086] Auxiliary parameters: The particulate dispersion suspension was not ultrasonically treated; the dispersant dosage was 0.20 g / L; there was no centrifugal separation treatment; low-temperature heat treatment (air atmosphere, heating rate 8.0℃ / min, heating to 180℃ and holding at that temperature for 1.5 h, cooling rate 2℃ / min).

[0087] Performance test and comparison results

[0088] The wear-resistant coatings of the wire travelers in Examples 1-3 and the comparative example were subjected to performance tests. The test items included the bonding strength between the coating and the substrate, the surface roughness of the composite functional layer, the salt spray corrosion resistance time, and the wear life (simulating the service conditions of a spinning machine and recording the time when the wire traveler showed obvious wear). The test results are shown in the table below:

[0089] The test results above show that the coating performance of Examples 1-3 of the present invention is significantly better than that of the comparative examples: the bonding strength is increased by more than 18.0%, the surface roughness is reduced by more than 21.7%, the salt spray corrosion resistance time is increased by more than 36.4%, and the wear resistance life is increased by more than 60.3%. Among them, Example 3 has the best performance because the parameters are close to the optimal range; Example 1 has moderate parameters and balanced overall performance, making it more suitable for large-scale industrial production.

[0090] The comparative results fully demonstrate that the present invention, through the synergistic effect of technical features such as gradient design, dual particle modification, and continuous deposition of a single plating solution, effectively solves the defects of existing technologies such as low coating bonding strength, poor wear and corrosion resistance, and complex processes, significantly improving the service performance and service life of the steel traveler of the spinning machine, and has significant technical advantages and industrial application value.

[0091] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wear-resistant coating for steel wire rings, characterized in that, The coating is attached to the surface of the steel wire coil substrate, characterized in that the coating is composed of a pure nickel-phosphorus alloy underlayer and a nickel-phosphorus alloy-based composite functional layer that are sequentially bonded together. The functional layer contains diffusely distributed spherical silicon carbide hard wear-resistant particles with double-modified surfaces. The particle mass percentage gradually increases from 3.8wt%-4.2wt% near the bottom layer to 5.8wt%-6.2wt% on the surface of the functional layer along the thickness direction. The phosphorus content of the bottom layer is controlled at 10.0wt%-10.4wt%, and the phosphorus content of the functional layer is 10.3wt%-11.0wt%. The phosphorus content from the bottom layer to the functional layer shows a continuous increasing gradient distribution. The coating is prepared by continuous deposition of a single plating solution. The bottom layer and the functional layer are formed continuously in the same plating solution, and the phosphorus content gradient and the particle gradient are formed synchronously.

2. The wear-resistant coating for steel wire rings according to claim 1, characterized in that, The spherical silicon carbide particles are modified by both plasma etching and silane coupling agent KH550. After the particle modification is completed, they are then subjected to centrifugal separation and drying treatment in an inert gas atmosphere.

3. The wear-resistant coating for steel wire rings according to claim 1, characterized in that, The pure nickel-phosphorus alloy base layer has a thickness of 6.5μm-7.5μm, the functional layer has a thickness of 11.5μm-12.5μm, and the total coating thickness is 19.5μm-20.5μm.

4. A coating method for a wear-resistant coating on a steel wire ring, applicable to the wear-resistant coating on a steel wire ring as described in any one of claims 1 to 3, characterized in that, Using only a single basic electroless nickel-phosphorus plating solution, without changing the solution or interrupting the plating process, pure nickel-phosphorus alloy underlayer deposition and nickel-phosphorus composite functional layer deposition are sequentially completed within this solution. This achieves a linear gradient distribution of spherical silicon carbide particles within the functional layer and a continuously increasing gradient distribution of phosphorus content between the underlayer and the functional layer. The specific implementation steps are as follows: Step 1: Pre-treatment of the steel wire ring substrate; Step 2: Preparation of basic electroless nickel-phosphorus plating solution; Step 3, bottom layer deposition; Step 4: In-situ composite deposition of functional layers; Step 5: Low-temperature heat treatment; In the continuous deposition process of a single plating solution, a combination of plating solution circulation filtration and continuous mechanical stirring is adopted.

5. The wear-resistant coating for steel wire rings according to claim 1, characterized in that, The outer surface roughness of the composite functional layer is 0.17μm-0.19μm, and the bonding strength between the coating and the substrate is 37MPa-39MPa.

6. The coating method for a wear-resistant coating on a steel wire ring according to claim 4, characterized in that, The substrate pretreatment consists of alkaline washing to remove oil, deionized water rinsing, sulfuric acid pickling to remove rust, deionized water rinsing, and dilute hydrochloric acid activation treatment, with deionized water rinsing performed after each step.

7. The coating method for a wear-resistant coating on a steel wire ring according to claim 4, characterized in that, The basic electroless nickel-phosphorus plating solution contains nickel sulfate, sodium hypophosphite, sodium citrate, and sodium acetate. The initial pH value of the plating solution is adjusted to 4.9-5.1, and the pH fluctuation of the plating solution is controlled within ≤±0.

1.

8. The coating method for a wear-resistant coating on a steel wire ring according to claim 4, characterized in that, The mold pretreatment step is as follows: the particle dispersion suspension containing spherical silicon carbide particles and dispersant used in the functional layer deposition is ultrasonically dispersed, and then a single plating solution is continuously added at a uniform speed using a peristaltic pump. During the addition process, ultrasonic vibration and mechanical stirring are applied simultaneously.

9. The wear-resistant coating for steel wire rings according to claim 4, characterized in that, The low-temperature heat treatment is carried out under industrial nitrogen protection, with a heating rate of 7.5℃ / min-8.5℃ / min. After heating to 175℃-185℃, the temperature is held constant for 1.4h-1.6h, and then cooled to room temperature in the furnace at a rate of 2℃ / min.

10. The coating method for a wear-resistant coating on a steel wire ring according to claim 4, characterized in that, The plating temperature for both the bottom layer and the functional layer is 84℃-86℃. After the bottom layer is deposited to a thickness of 6.8μm-7.2μm, the functional layer is deposited directly in the same plating solution until the thickness reaches 11.8μm-12.2μm.

Images