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CN-116657208-B - Preparation method of Ni/WC wear-resistant composite coating

CN116657208BCN 116657208 BCN116657208 BCN 116657208BCN-116657208-B

Abstract

The invention discloses a preparation method of a Ni/WC wear-resistant composite coating, which comprises the specific steps of coarsening a substrate, carrying out electric cleaning treatment on the coarsened substrate, carrying out activation treatment on the electric cleaned substrate, carrying out pre-deposition treatment on the activated substrate, and carrying out subsequent nickel brushing treatment on the pre-deposited substrate. The preparation method of the wear-resistant coating has the advantages of simple steps, controllable process, low equipment cost and tight combination of the composite coating and the substrate. The roughening and pre-depositing treatment means adopted by the invention can successfully obtain the Ni/WC composite plating layer with excellent and uniform wear resistance.

Inventors

  • Chen Xuanle
  • ZHUO HAIOU
  • TANG JIANCHENG
  • YE NAN
  • XIA HAO
  • JIANG NAN

Assignees

  • 南昌大学
  • 江西国创院新材料有限公司

Dates

Publication Date
20260505
Application Date
20230711

Claims (7)

  1. 1. A preparation method of a Ni/WC wear-resistant composite coating is characterized by comprising the following steps: a) Coarsening a substrate, and performing ultrasonic cleaning on the coarsened substrate, wherein the substrate is a 304 stainless steel strip with the thickness of 0.3 mm; b) Carrying out electric cleaning treatment on the substrate obtained in the step a); c) Performing activation treatment on the substrate obtained in the step b); d) Performing pre-deposition WC treatment on the substrate obtained in the step c); e) And d) carrying out electric brush plating treatment on the substrate obtained in the step d), wherein WC is added into nickel liquid subjected to the electric brush plating treatment, and a Ni/WC composite plating layer with excellent wear resistance can be obtained after cleaning and drying.
  2. 2. The method for preparing the Ni/WC wear-resistant composite coating according to claim 1, wherein the roughening treatment is sand blasting treatment, the compressed air pressure in a spray gun is 0.3-0.7 MPa, and the sand grain is 800-mesh quartz sand.
  3. 3. The preparation method of the Ni/WC wear-resistant composite coating, which is characterized in that in the electro-cleaning treatment, the electro-cleaning liquid comprises 25g/L of sodium hydroxide, 20g/L of sodium carbonate, 50g/L of sodium phosphate, 3g/L of sodium chloride and 0.1mL/L of OP emulsifier, a substrate is positively connected with a power supply, the working voltage is 2-12V, the relative substrate movement speed of a plating pen is 50-200 mm/s, and the electro-cleaning time is 15-180 s.
  4. 4. The preparation method of the Ni/WC wear-resistant composite coating, as claimed in claim 1, is characterized in that the activating solution in the activation process comprises 40g/L of hydrochloric acid with mass fraction of 37%, 150g/L of sodium chloride and 0.5mL/L of 0.1% methyl red ethanol solution, a substrate is reversely connected with a power supply during the activation treatment, the working voltage is 4-10V, the relative substrate movement speed of a plating pen is 50-300 mm/s, the activation time is 10-60 s, and the temperature is 40-60 ℃.
  5. 5. The method for preparing the Ni/WC wear-resistant composite coating according to claim 1, wherein the treatment fluid in the pre-deposition WC treatment is 5-50 g/L WC and 0.5-5 g/L polyethylene glycol.
  6. 6. The preparation method of the Ni/WC wear-resistant composite coating, as claimed in claim 5, is characterized in that the pre-deposition WC treatment is carried out by horizontally placing a substrate in a treatment liquid for soaking for 60-600 s, and the treatment liquid is always placed in a magnetic stirrer for stirring during the pre-deposition treatment, and the rotating speed of a rotor is 10-30 r/min.
  7. 7. The preparation method of the Ni/WC wear-resistant composite coating according to claim 1, wherein the nickel liquid in the brush plating treatment comprises 400g/L of nickel sulfate, 30g/L of nickel chloride, 30g/L of hydrochloric acid with mass fraction of 37%, 70mL/L of acetic acid and 5-15 g/L of WC, a substrate is positively connected with a power supply for brush plating, the working voltage is 4-12V, the relative substrate movement speed of a plating pen is 50-500 mm/s, the brush plating time is 3-20 min, and the temperature is 60-80 ℃.

Description

Preparation method of Ni/WC wear-resistant composite coating Technical Field The invention belongs to the technical field of composite coating preparation, and particularly relates to a preparation method of a Ni/WC wear-resistant composite coating. Background With advances in technology and industry, mechanical parts often need to operate in a harsh working environment, and therefore, higher demands are placed on the surface properties of the parts. For surface modification by plating, conventional single plating often can only meet the requirement of improving a certain property of the workpiece surface. The composite coating can improve the hardness, the wear resistance, the corrosion resistance and the like of the workpiece while the performance of the single coating is maintained. Therefore, the surface performance of the workpiece is improved by coating the surface of the workpiece with the composite plating layer, and the method is regarded as an effective method for solving the problems of corrosion and abrasion of the workpiece in special environments. Tungsten carbide is widely applied to the field of preparing wear-resistant composite coatings due to excellent high temperature resistance, corrosion resistance, wear resistance and other performances. However, the preparation method in the prior art has the defects of uneven WC distribution, uneven plating layer, unstable performance and the like. Disclosure of Invention In order to solve the problems, the invention overcomes the defects of the prior preparation method of the Ni/WC wear-resistant composite coating and provides a novel preparation method of the Ni/WC wear-resistant composite coating. The specific technical scheme is as follows: a preparation method of a Ni/WC wear-resistant composite coating comprises the following steps: (1) Coarsening and sandblasting the substrate, and cleaning the substrate after sandblasting; (2) Connecting the cleaned substrate to a power supply in the forward direction for electric cleaning; (3) Reversely connecting the substrate subjected to the electric cleaning treatment to a power supply for activation treatment; (4) Horizontally placing the substrate after the activation treatment in a pre-deposition treatment liquid, and performing pre-deposition WC treatment; (5) And the substrate after the pre-deposition WC is positively connected to a power supply for electric brush nickel plating, and the Ni/WC composite plating layer with tight combination and good wear resistance can be obtained after cleaning and drying. Specifically, the particle size of the quartz sand subjected to sand blasting treatment is 800 meshes, and the compressed air pressure in a spray gun is 0.3-0.7 MPa. Preferably, the cleaning process in step (1) is ultrasonic-assisted cleaning. Preferably, in the step (2), the electric cleaning treatment liquid comprises 25g/L of sodium hydroxide, 20g/L of sodium carbonate, 50g/L of sodium phosphate, 3g/L of sodium chloride and 0.1mL/L of OP emulsifier, the electric cleaning voltage is 2-12V, the relative substrate movement speed of the plating pen is 50-200 mm/s, and the electric cleaning time is 15-180 s. Preferably, in the step (3), the components of the activation treatment liquid are 40g/L hydrochloric acid with mass fraction of 37%, 150g/L sodium chloride and 0.5 mL/L0.1% methyl red ethanol solution, the activation voltage is 4-10V, the relative substrate movement speed of the plating pen is 50-300 mm/s, the activation time is 10-60 s, and the activation temperature is 40-60 ℃. Preferably, in the step (4), the pre-deposition treatment liquid needs to be magnetically stirred in the use process, and the rotating speed of the rotor is 10-30 r/min. Preferably, in the step (4), the components of the pre-deposition treatment liquid are WC with the concentration of 5-50 g/L, polyethylene glycol with the concentration of 0.5-5 g/L and deionized water with the balance, and the pre-deposition time is 60-600 s. Preferably, in the step (5), the nickel plating solution comprises 400g/L of nickel sulfate, 30g/L of nickel chloride, 30g/L of hydrochloric acid with mass fraction of 37%, 70mL/L of acetic acid and 5-15 g/L of WC, the brush plating voltage is 4-12V, the relative substrate movement speed of a plating pen is 50-500 mm/s, the brush plating time is 3-20 min, and the brush plating temperature is 60-80 ℃. According to the preparation method of the Ni/WC wear-resistant composite coating, disclosed by the invention, the pretreatment adopts a mode of combining sand blasting with pre-deposition, so that WC powder is uniformly deposited in the groove formed by sand blasting before brush plating, the content of WC in the composite coating is ensured, and the problem of non-uniform WC distribution caused by manual operation is avoided. Meanwhile, the pre-deposition treatment can enable the WC powder in the groove to be completely coated by a thinner Ni layer in the subsequent electric brush, so that the pro