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Composite coating with micron-scale roughness, preparation method and application

A composite coating, micron-level technology, applied in the field of electrodeposition, can solve the problems of large environmental pollution of chromium plating, toxic chromium, and complex process.

Pending Publication Date: 2021-07-27
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is complex in process, and chromium is a toxic heavy metal, and chromium plating has the disadvantages of large environmental pollution and difficult wastewater treatment.

Method used

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  • Composite coating with micron-scale roughness, preparation method and application
  • Composite coating with micron-scale roughness, preparation method and application
  • Composite coating with micron-scale roughness, preparation method and application

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preparation example Construction

[0025] According to some embodiments of the present invention, there is also provided a preparation method for the above-mentioned composite coating with micron-scale roughness, comprising the following steps:

[0026] Step A, uniformly dispersing SiC powder in the basic plating solution containing metal salt to obtain a composite plating solution, wherein the SiC powder contains nano-scale SiC and micron-scale SiC;

[0027] Among them, in order to stably disperse and effectively compound SiC powder in the composite plating solution, it is necessary to carry out pretreatment steps such as degreasing, activation and surface modification of SiC powder to make the surface of SiC powder charge a certain amount. Preferably, after pretreatment, the Zeta potential of the nanoscale SiC surface is between -10 to -40mV or +10 to +40mV, and the Zeta potential of the microscale SiC surface is between -5 to -40mV or +5 to +40mV between.

[0028] More specifically, absolute alcohol can be ...

Embodiment 1

[0043] 1. Preparation of composite plating solution

[0044] The composition of the basic plating solution for composite electrodeposition is: nickel sulfate hexahydrate 250g / L, nickel chloride hexahydrate 20g / L, cobalt sulfate heptahydrate 20g / L, boric acid 30g / L, and sodium phosphate 2g / L; The pretreated SiC powder is added to the plating solution, and dispersed uniformly to form a composite plating solution. The particle size and content of the SiC powder are: 40nm SiC 5g / L, 10μm SiC 50g / L.

[0045] Among them, through pretreatment steps such as degreasing and oil removal with anhydrous alcohol, activation with 10% dilute sulfuric acid, and surfactant modification with 0.2g / L sodium dodecylbenzenesulfonate, the Zeta potential of the nano-scale SiC surface is -30± 5mV, the Zeta potential of the micron-sized SiC surface is between -25±5mV, and the SiC powder is uniformly dispersed in the composite plating solution.

[0046] 2. Composite electrodeposition

[0047] In the compo...

Embodiment 2

[0053] 1. Preparation of composite plating solution

[0054] The composition of the basic plating solution for composite electrodeposition is: nickel sulfate hexahydrate 350g / L, nickel chloride hexahydrate 30g / L, boric acid 30g / L; add pretreated SiC powder to the basic plating solution, and disperse evenly to form a composite The particle size and content of the SiC powder in the plating solution are: 300nm SiC 50g / L, 0.6μm SiC 5g / L.

[0055] Among them, through pretreatment steps such as degreasing and oil removal with anhydrous alcohol, activation with 10% dilute sulfuric acid, and surfactant modification with 0.2g / L sodium dodecylbenzenesulfonate, the Zeta potential of the nano-scale SiC surface is -30± 5mV, the Zeta potential of the micron-sized SiC surface is between -25±5mV, and the SiC powder is uniformly dispersed in the composite plating solution.

[0056] 2. Composite electrodeposition

[0057] In the composite plating solution, the 9Cr2Mo alloy steel is used as th...

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Abstract

The invention discloses a composite coating with micron-scale roughness, a preparation method and application. The composite coating comprises the following components in percentage by mass: 80-99% of a metal matrix and 1-20% of SiC powder, wherein the SiC powder comprises nano-scale SiC and micron-scale SiC. Through grading of nano-scale SiC and micron-scale SiC, the composite coating with both surface roughness and hardness is obtained, and the requirement of replacing a hard chromium coating can be met.

Description

technical field [0001] The invention belongs to the technical field of electrodeposition, and in particular relates to a composite coating with micron-level roughness, a preparation method and an application. [0002] technical background [0003] The roll is a common working part of a rolling mill in industrial production. In the production process, there are certain requirements for the hardness and roughness of the roll surface. The high hardness of the roll surface is the key to improving the wear resistance, prolonging the service life of the roll, and improving the surface quality of the steel plate. [0004] The method of obtaining the surface hardness of the roll: hard chromium plating method, that is, by electroplating a layer of hard chromium layer on the surface of the roll substrate, so as to improve the hardness and wear resistance of the roll surface, and the hardness is between Hv 600-900. [0005] The method of obtaining the surface roughness of the roll: th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D15/00
CPCC25D15/00
Inventor 李卫平饶晗陈海宁刘慧丛朱立群
Owner BEIHANG UNIV
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