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CN-121826707-B - Wear-resistant corrosion-resistant high-entropy alloy coating for deep-water deep-buried hydraulic metal structure, and preparation method and application thereof

CN121826707BCN 121826707 BCN121826707 BCN 121826707BCN-121826707-B

Abstract

The invention relates to the technical field of high-performance metal coatings and underwater engineering protection, in particular to a wear-resistant corrosion-resistant high-entropy alloy coating for a deep-water deep-buried hydraulic metal structure, and a preparation method and application thereof. The wear-resistant corrosion-resistant high-entropy alloy coating for the deep-water deep-buried hydraulic metal structure is prepared by depositing high-entropy alloy powder of a core-shell structure on the surface of a substrate through a blue laser cladding process, wherein the high-entropy alloy powder of the core-shell structure comprises an inner core and a shell, the inner core is FeCoNiCrMn high-entropy alloy powder, and the shell is an Al-Ti-O shell. The wear-resistant corrosion-resistant high-entropy alloy coating provided by the invention has excellent microhardness, wear resistance and corrosion resistance, is suitable for being used in environments with water depths of 200m and below, and has wide application prospects in the field of protection of deep-water deep-buried hydraulic metal structures.

Inventors

  • ZHANG JIANFENG
  • WANG JINYI
  • REN JINGYI
  • LI JIACHENG
  • GE MENGNI

Assignees

  • 河海大学

Dates

Publication Date
20260512
Application Date
20260311

Claims (9)

  1. 1. The wear-resistant corrosion-resistant high-entropy alloy coating for the deep-water deep-buried hydraulic metal structure is characterized by being prepared by depositing high-entropy alloy powder of a core-shell structure on the surface of a substrate through a blue laser cladding process, wherein the high-entropy alloy powder of the core-shell structure comprises an inner core and an outer shell, the inner core is FeCoNiCrMn high-entropy alloy powder, and the outer shell is an Al-Ti-O shell; The preparation method comprises the steps of immersing FeCoNiCrMn high-entropy alloy powder in an Al 3+ /Ti 4+ mixed salt solution, adjusting the pH of the system to 8-9, mechanically stirring, aging the stirred mixed solution at 50-70 ℃ for 4-6 hours, separating to obtain a solid product, drying the solid product at 80-120 ℃ for 1-3 hours, and calcining at 300-700 ℃ for 1-4 hours, thus realizing the in-situ construction of the Al-Ti-O shell on the surface of FeCoNiCrMn high-entropy alloy powder.
  2. 2. The wear-resistant corrosion-resistant high-entropy alloy coating for the deep-water deep-buried hydraulic metal structure according to claim 1, wherein FeCoNiCrMn high-entropy alloy powder is obtained by mixing Fe powder, co powder, ni powder, cr powder and Mn powder according to an atomic ratio of (0.95-1.05) to (1-1.1) to (0.85-1) to (1-1.1) to (0.5-0.65) and then performing ball milling treatment.
  3. 3. The wear-resistant corrosion-resistant high-entropy alloy coating for the deep-water deep-buried hydraulic metal structure according to claim 2, wherein the particle size of Fe powder, co powder, ni powder, cr powder and Mn powder is 45-75 mu m, and the particle size of FeCoNiCrMn high-entropy alloy powder obtained by ball milling treatment is 35-55 mu m.
  4. 4. The wear-resistant corrosion-resistant high-entropy alloy coating for a deep-water deep-buried hydraulic metal structure according to claim 2, wherein the rotation speed of ball milling treatment is 200-400 rpm, the ball-material ratio is (5-15) to 1, and the ball milling time is 30-60 h.
  5. 5. The wear-resistant corrosion-resistant high-entropy alloy coating for a deep water deep buried hydraulic metal structure according to claim 1, wherein the thickness of the Al-Ti-O shell layer is 50-100 nm, and the atomic ratio of Al, ti and O in the Al-Ti-O shell layer is (2-3): 1 (3.5-5.5).
  6. 6. The wear-resistant corrosion-resistant high-entropy alloy coating for a deep-water deep-buried hydraulic metal structure according to any one of claims 1 to 4, wherein the blue laser cladding process is carried out under the protection of inert gas, and is characterized by having a power of 3000-5000W, a scanning speed of 5-15 mm/s, a powder feeding rate of 6-10 g/min, a spot diameter of 2-3 mm, a lap joint rate of 30-50% and a wavelength of 430-470 nm.
  7. 7. The wear-resistant corrosion-resistant high-entropy alloy coating for a deep water buried hydraulic metal structure according to any one of claims 1 to 4, wherein the substrate is one or more of a Q345 steel substrate, a Q235 steel substrate, a Q355 steel substrate, and a 16Mn steel substrate.
  8. 8. A method for preparing the wear-resistant corrosion-resistant high-entropy alloy coating for a deep-water deep-buried hydraulic metal structure according to any one of claims 1 to 7, comprising the following steps: (1) Mixing Fe powder, co powder, ni powder, cr powder and Mn powder according to the atomic ratio of (0.95-1.05) to (1-1.1) to (0.85-1) to (1-1.1) to (0.5-0.65), and performing ball milling treatment to obtain FeCoNiCrMn high-entropy alloy powder; (2) Taking FeCoNiCrMn high-entropy alloy powder as a core, and depositing an Al-Ti-O shell layer on the outer surface of the core through a coprecipitation process to obtain high-entropy alloy powder with a core-shell structure; (3) And depositing the high-entropy alloy powder with the core-shell structure on the surface of the matrix through a blue laser cladding process to obtain the wear-resistant corrosion-resistant high-entropy alloy coating.
  9. 9. Use of the wear-resistant corrosion-resistant high-entropy alloy coating according to any one of claims 1 to 7 as a protective coating for deep water deep-buried hydraulic metal structures, wherein the deep water deep-buried hydraulic metal structures are one or more of submarine tunnel lining, deep water gates and cross-sea bridge foundations.

Description

Wear-resistant corrosion-resistant high-entropy alloy coating for deep-water deep-buried hydraulic metal structure, and preparation method and application thereof Technical Field The invention relates to the technical field of high-performance metal coatings and underwater engineering protection, in particular to a wear-resistant corrosion-resistant high-entropy alloy coating for a deep-water deep-buried hydraulic metal structure, and a preparation method and application thereof. Background The protective coating of the deep water deep buried hydraulic metal structure such as submarine tunnel lining, a deep water gate, a cross-sea bridge foundation and the like is easy to have the following key problems in extreme environments such as high pressure (more than or equal to 5 MPa), high corrosion (Cl - concentration is more than or equal to 3.5%), strong abrasion (sand-containing water flow rate is more than or equal to 3 m/s) and the like. Firstly, the abrasion-corrosion coupling damage is that the sediment particle impact causes mechanical abrasion, meanwhile, the seawater corrosion accelerates the material failure, and the traditional single-function protective coating (such as an epoxy resin anti-corrosion coating or a tungsten carbide wear-resistant coating) is difficult to cooperatively resist the composite damage. And secondly, the high-pressure interface stripping risk is that the coating and the matrix (such as Q345 steel) are easy to generate interface stripping due to low bonding strength under deep sea temperature fluctuation and high pressure loading due to the difference of thermal expansion coefficients, so that local corrosion perforation is caused. Thirdly, the long-term maintenance is difficult, the existing coating lacks in-situ repair capability, the manual overhaul cost of the deepwater environment is high, and the traditional detection means (such as ultrasonic flaw detection) cannot monitor the microcrack and early corrosion of the coating in real time. In addition, the combined effects of long-term soaking, dry-wet alternation, high-speed water flow scouring, sediment abrasion and the like can accelerate the combined effect of electrochemical corrosion and mechanical abrasion. Therefore, the existing protection technology of the deep water deep buried hydraulic metal structure has three major bottlenecks that the traditional coating is easy to peel off and lose efficacy under high-pressure permeation, the conventional stainless steel is insufficient in hardness and poor in cavitation erosion resistance, in-situ monitoring means aiming at the deep buried structure is lacking, the maintenance is dependent on manual diving detection, the cost is high, the risk is high, and the repair difficulty is high after the structural damage is detected. Currently, high-entropy alloys (HEAs) exhibit high hardness, corrosion resistance, and thermal stability due to multi-principal element synergy, and are considered as ideal candidates for deep sea protective coatings. However, the application of the high-entropy alloy in a deep water deep-buried hydraulic metal structure still has a plurality of bottlenecks. First, there is a compositional conflict between the high hardness requirements (e.g., co, cr enrichment) and the corrosion resistance optimization (e.g., cr passivation film continuity), resulting in a performance imbalance. Secondly, the preparation process has poor adaptability, plasma and surfacing welding are easy to cause thermal deformation of the matrix, and the application of complex components is limited. In addition, the cold spraying process has high sensitivity to powder granularity, and coarse particles can cause the reduction of coating compactness and the deterioration of mechanical properties. Therefore, how to develop a high-entropy alloy coating and a matched preparation process thereof so as to solve the problems of abrasion resistance, unbalanced corrosion resistance, interface failure, operation and maintenance hysteresis and the like of the hydraulic metal structure coating in a deep sea high-pressure environment, and has important significance for promoting the protection or repair technology of the hydraulic metal structure to reach high performance, intellectualization and long-acting crossing. Disclosure of Invention In order to solve the problems, the invention aims to provide a wear-resistant corrosion-resistant high-entropy alloy coating for a deep-water deep-buried hydraulic metal structure, and a preparation method and application thereof. The wear-resistant corrosion-resistant high-entropy alloy coating prepared by the invention can comprehensively improve microhardness, wear resistance and corrosion resistance of the coating through ingredient-structure-process multidimensional synergistic improvement, solves the problems of unbalanced wear resistance and corrosion resistance, interface failure, easy wear corrosion and the like of the coating in a deep sea high-pr