In-situ synthesis method of Ni-W-WC composite coating

An in-situ synthesis and composite coating technology, applied in the field of metal surface engineering, can solve the problems of low production cost of powder utilization, affect the apparent hardness of co-deposits, affect the surface morphology of coatings, etc., to reduce internal stress and fine grains , the effect of strong interface binding force

Active Publication Date: 2021-12-07
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN101122043 describes a method for preparing a nano-tungsten carbide-nickel composite coating for hydraulic machinery. Nano-tungsten carbide powder is added to the electroplating solution, and the formed coating can be used for anti-corrosion and anti-wear component materials of hydraulic machinery. The method has the characteristics of high powder utilization rate and low production cost, but WC particles are easy to agglomerate and wrap impurities in the plating solution, so WC particles are directly used as reinforcing particles to be compounded into the crystal phase of the coating structure, and there are often pores Defects with large rate and rough coating
The document Effects ofWCaddition on structure and hardness of electrodeposited Ni-W (doi.org / 10.1016 / j.surfcoat.2009.05.027) introduces a Ni-W / WC composite coating prepared by adding WC particles. It is found that the current density includes Process parameters including particle content and particle size will affect the surface morphology of the coating, thereby affecting the apparent hardness of the co-deposit
It can be found from the text that by adding particles to the plating solution to obtain a composite coating, the process range is narrow, and the doping amount of WC in the coating is low

Method used

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  • In-situ synthesis method of Ni-W-WC composite coating
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  • In-situ synthesis method of Ni-W-WC composite coating

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A preparation method for in-situ synthesis of Ni-W-WC composite coating, the specific process is:

[0031] (1) Prepare the electroplating solution: add 300mL of deionized water to the cleaned 1# beaker, heat to 65°C, add a certain mass of nickel sulfate solid, and stir until completely dissolved. Heat 300mL of deionized water to 75°C in a 2# beaker, add sodium citrate, citric acid, ammonium citrate and sodium tungstate in sequence, and stir until completely dissolved. Slowly add the liquid in the 1# beaker to the 2# beaker, then add the carburant and wetting agent, stir until completely dissolved, and finally add deionized water to make the solution in the 2# beaker to the required volume, and adjust the pH of the solution with ammonia water value to 7.5. The composition of the electroplating solution is shown in Table 1:

[0032] Plating solution composition in the embodiment 1 of table 1

[0033]

[0034] (2) Carbon steel substrate pretreatment: 180#-240# corund...

Embodiment 2

[0039] A preparation method for in-situ synthesis of Ni-W-WC composite coating, the specific process is:

[0040] (1) Prepare the electroplating solution: add 300mL of deionized water to the cleaned 1# beaker, heat to 65°C, add a certain mass of nickel sulfate solid, and stir until completely dissolved. Heat 300mL of deionized water to 75°C in a 2# beaker, add sodium citrate, citric acid, ammonium citrate and sodium tungstate in sequence, and stir until completely dissolved. Slowly add the liquid in the 1# beaker to the 2# beaker, then add the carburant and wetting agent, stir until completely dissolved, and finally add deionized water to dilute the solution in the 2# beaker to the required value.

[0041] Need volume, and adjust the pH value of the solution to 7.6 with ammonia water. The composition of the electroplating solution is shown in Table 2:

[0042] Plating solution composition in the embodiment 2 of table 2

[0043]

[0044] (2) Substrate pretreatment: 180#-2...

Embodiment 3

[0049] A preparation method for in-situ synthesis of Ni-W-WC composite coating, the specific process is:

[0050] (1) Prepare the electroplating solution: add 300mL of deionized water to the cleaned 1# beaker, heat to 65°C, add a certain mass of nickel sulfate solid, and stir until completely dissolved. Heat 300mL of deionized water to 75°C in a 2# beaker, add sodium citrate, citric acid, ammonium citrate and sodium tungstate in sequence, and stir until completely dissolved. Slowly add the liquid in the 1# beaker to the 2# beaker, then add the carburant and wetting agent, stir until completely dissolved, and finally add deionized water to make the solution in the 2# beaker to the required volume, and adjust the pH of the solution with ammonia water value to 7.7. The composition of the electroplating solution is shown in Table 3:

[0051] Electroplating solution composition in the embodiment 3 of table 3

[0052]

[0053]

[0054] (2) Carbon steel substrate pretreatmen...

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Abstract

The invention discloses an in-situ synthesis method of a Ni-W-WC composite coating. Comprising the following steps that a to-be-plated carbon steel base material is immersed in electroplating liquid to be electroplated, so that a Ni-W-C alloy plating layer is obtained on the surface of the carbon steel base material, and the alloy plating layer is subjected to high-temperature heat treatment to obtain the Ni-W-WC composite plating layer. The electroplating liquid comprises the following components: nickel salt, tungstate, citric acid, citrate, a carburant and a wetting agent. The method is simple to operate, high in current efficiency, simple in electroplating process, clean, free of pollution and capable of meeting the environmental protection requirement.

Description

technical field [0001] The invention belongs to the technical field of metal surface engineering, in particular to an in-situ synthesis method of a Ni-W-WC composite coating. Background technique [0002] With the rapid development of surface engineering technology, coatings with special functions have received increasing attention. Hard chromium plating has high hardness and high corrosion resistance, and is widely used in the field of surface engineering, but its plating solution is extremely harmful, and there are disadvantages such as high energy consumption and low current efficiency of electroplating, which makes this technology gradually eliminated and replaced by " Environmentally friendly and economical" substitute chrome coating. Ni-W alloy coating combines the dual advantages of nickel and tungsten metals, and its corrosion resistance and wear resistance are significantly better than other nickel-based metal alloys. It can be used as surface coating materials for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/50C25D3/56
CPCC25D5/50C25D3/56Y02E60/50C25D3/562C25D3/12C25D7/0614C25D17/10
Inventor 王慧华徐英君盛施展王德永屈天鹏田俊侯栋李向龙胡绍岩
Owner SUZHOU UNIV
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