Search

CN-121992465-A - Plating process of titanium wire surface coating

CN121992465ACN 121992465 ACN121992465 ACN 121992465ACN-121992465-A

Abstract

The invention discloses a plating process of a titanium wire surface coating, which comprises the following steps of S1, composite pretreatment, S2, chemical plating of a transition layer, S3, pulse electric plating of a functional layer and S4, low-temperature densification treatment. The micro-nano level coarse structure is constructed by innovatively adopting pulse laser, interface combination is enhanced to avoid coating falling, a nickel-tungsten functional layer gradient structure of a nickel-phosphorus transition layer and silane modified nano alumina is designed, comprehensive performances such as wear resistance, high temperature resistance and the like are improved, chemical plating and pulse electroplating are adopted to match with low-temperature densification, equipment investment and energy consumption are reduced, period is shortened, and efficiency and environmental protection are considered. The coating obtained by the plating process of the titanium wire surface coating has the advantages of high strength binding force, high hardness, high temperature resistance and environment-friendly process.

Inventors

  • Shao Mian
  • YE HAORAN
  • LI HAILONG

Assignees

  • 陕西一钛工金属材料科技有限公司

Dates

Publication Date
20260508
Application Date
20260410

Claims (7)

  1. 1. The plating process of the titanium wire surface coating is characterized by comprising three process steps of composite pretreatment, gradient composite plating and low-temperature densification treatment, and comprises the following specific steps: S1, compound pretreatment, namely placing titanium wires in alkaline degreasing fluid, carrying out ultrasonic cleaning at 50-60 ℃, washing with deionized water after ultrasonic treatment, immersing the degreased titanium wires in 10-15% of pickling mixed fluid by mass fraction for 3-5 min at room temperature, washing with deionized water after pickling, and carrying out scanning treatment on the surfaces of the titanium wires by using pulse laser to obtain pretreated titanium wires; s2, chemically plating a transition layer, namely placing the pretreated titanium wire into a chemical plating solution, and preserving heat for 40-60 min at 85-90 ℃ to form a nickel-phosphorus transition layer; S3, pulse plating of the functional layer, namely taking the titanium wire plated with the transition layer as a cathode, taking graphite as an anode, putting the titanium wire into a composite plating solution for pulse plating, and assisting in ultrasonic dispersion to form a nickel tungsten-nano Al 2 O 3 functional layer; S4, carrying out low-temperature densification treatment, namely placing the plated titanium wire into a vacuum furnace, preserving heat for 2-3 hours at 300-350 ℃, and cooling the titanium wire to room temperature along with the furnace to form a composite coating on the surface of the titanium wire, wherein the vacuum degree is less than or equal to 5 multiplied by 10 < -3 > Pa.
  2. 2. The process for plating a titanium wire surface coating according to claim 1, wherein in S1: The alkaline degreasing fluid is prepared from, by weight, 5-8 parts of sodium hydroxide, 3-5 parts of sodium carbonate, 1-2 parts of surfactant sodium dodecyl benzene sulfonate and 85-90 parts of water; the ultrasonic frequency is 20-40 kHz, and the ultrasonic time is 15-20 min; The mass ratio of hydrofluoric acid to nitric acid in the pickling mixed solution is 1:3; The power of the pulse laser is 50-80W, the scanning speed is 100-150 mm/s, and the pulse frequency is 20-30 kHz.
  3. 3. The plating process of the titanium wire surface coating according to claim 1, wherein in the step S2, the electroless plating solution is prepared from, by weight, 25-30 parts of nickel sulfate, 35-40 parts of sodium hypophosphite, 15-20 parts of sodium citrate, 10-15 parts of ammonium chloride and 910-930 parts of water.
  4. 4. The plating process of the titanium wire surface coating according to claim 1, wherein in the step S3, the composite plating solution is prepared from, by weight, 40-50 parts of nickel sulfate, 20-25 parts of sodium tungstate, 5-8 parts of modified nano aluminum oxide, 25-30 parts of trisodium citrate, 10-15 parts of boric acid and 870-900 parts of water.
  5. 5. The process for plating a titanium wire surface coating according to claim 1, wherein in the step S3, the pulse parameters are that the forward pulse current density is 3-5A/dm 2, the pulse width is 200-300 mu S, the reverse pulse current density is 1-2A/dm 2, the pulse width is 50-100 mu S, the plating temperature is 55-60 ℃ and the time is 60-90 min.
  6. 6. The process for plating a titanium wire surface coating according to claim 1, wherein in the step S3, the ultrasonic dispersion frequency is 30-40 khz, and the ultrasonic power is 200-400 w.
  7. 7. The plating process of the titanium wire surface coating according to claim 4, wherein the preparation method of the modified nano aluminum oxide is characterized in that nano Al 2 O 3 particles with the particle size of 50-80 nm are taken and mixed according to the mass ratio of 10-20:1 of absolute ethyl alcohol to nano Al 2 O 3 , then a suspension is obtained by ultrasonic dispersion for 20-30 min under the condition of ultrasonic frequency of 20-30 kHz, then a silane coupling agent KH550 is added according to 1-3% of the mass of nano Al 2 O 3 , stirring reaction is carried out for 30-40 min at 50-60 ℃, centrifugation and separation precipitation are carried out at the rotating speed of 3000-6000 rpm, and the precipitate is dried for 2-3 h at 80-100 ℃ to obtain the modified nano aluminum oxide.

Description

Plating process of titanium wire surface coating Technical Field The invention relates to the technical field of metal surface treatment, in particular to a plating process of a titanium wire surface coating. Background Titanium wires are widely used in a variety of high-end fields because of their excellent corrosion resistance, biocompatibility, and high strength to weight ratio. However, pure titanium wires have low surface hardness and poor wear resistance, and are susceptible to oxidation failure in a high-temperature environment, so that the application range of the pure titanium wires in extreme working conditions is limited. The existing surface treatment technology such as laser cladding is easy to generate cracks, the interface stress is concentrated and the toughness is reduced due to high carbon content, cold spraying needs high-cost gas and has high porosity, the traditional electroplating is interfered by an oxide film to cause weak bonding force, ion plating is used for example, multi-arc ion plating is used, but the bonding force of a film base is insufficient and is easy to peel off, and a surface diffusion method is used for combining high-temperature treatment of aluminum alloy and electromagnetic field cooling, but the coating is easy to generate air holes and cracks. The methods generally have the problems of weak coating binding force, poor tissue uniformity or high process complexity, and the interface binding and high temperature resistance of the coating and the matrix still need to be optimized. Therefore, development of a plating process for a titanium wire surface coating which combines the characteristics of high strength binding force, high hardness, high temperature resistance and environmental protection is needed. Disclosure of Invention The invention aims to provide a plating process of a titanium wire surface coating, which aims to solve the problems of weak coating binding force, poor tissue uniformity, high process complexity and the like in the conventional titanium wire surface treatment process. In order to achieve the above purpose, the present invention provides the following technical solutions: a plating process of a titanium wire surface coating comprises the following steps: S1, compound pretreatment, namely placing titanium wires in alkaline degreasing fluid, carrying out ultrasonic cleaning at 50-60 ℃, washing with deionized water after ultrasonic treatment, then immersing the degreased titanium wires into acid washing mixed fluid with the mass fraction of 10-15% for acid washing, washing with deionized water after the acid washing is finished, and carrying out scanning treatment on the surfaces of the titanium wires by using pulse laser to obtain pretreated titanium wires. S2, chemically plating the transition layer, namely placing the pretreated titanium wire into chemical plating solution, and preserving heat for 40-60 min at 85-90 ℃ to form the nickel-phosphorus transition layer. S3, pulse plating the functional layer, namely taking the titanium wire plated with the transition layer as a cathode and graphite as an anode, putting the titanium wire into a composite plating solution for pulse plating and assisting in ultrasonic dispersion to form the nickel tungsten-nano Al 2O3 functional layer. S4, performing low-temperature densification treatment, namely placing the plated titanium wire into a vacuum furnace, preserving heat for 2-3 hours at 300-350 ℃ and vacuum degreeAnd then cooling to room temperature along with the furnace, and forming a composite coating on the surface of the titanium wire. As a preferable embodiment of the present invention, in S1: The alkaline degreasing fluid is prepared from, by weight, 5-8 parts of sodium hydroxide, 3-5 parts of sodium carbonate, 1-2 parts of surfactant sodium dodecyl benzene sulfonate and 85-90 parts of water; the ultrasonic frequency is 20-40 kHz, and the ultrasonic time is 15-20 min; The mass ratio of hydrofluoric acid to nitric acid in the pickling mixed solution is 1:3; The power of the pulse laser is 50-80W, the scanning speed is 100-150 mm/s, and the pulse frequency is 20-30 kHz. In the preferred technical scheme of the invention, in the S2, the electroless plating solution is prepared from, by weight, 25-30 parts of nickel sulfate, 35-40 parts of sodium hypophosphite, 15-20 parts of sodium citrate, 10-15 parts of ammonium chloride and 910-930 parts of water. According to the preferable technical scheme, in the S3, the composite plating solution is prepared from, by weight, 40-50 parts of nickel sulfate, 20-25 parts of sodium tungstate, 5-8 parts of modified nano-alumina, 25-30 parts of trisodium citrate, 10-15 parts of boric acid and 870-900 parts of water. As a preferable technical scheme of the invention, in the step S3, the pulse parameters are that the forward pulse current density is 3-5A/dm 2, the pulse width is 200-300 mu S, the reverse pulse current density is 1-2A/dm 2, the pulse width is 50-100