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Method for pulse electrodeposition of Ni-SiC composite coating on surface of aluminum alloy

A technology of pulse electrodeposition and aluminum alloy surface, applied in the direction of superimposed layer plating, metal material coating process, coating, etc. Uneven distribution and other problems, to achieve the effect of small porosity, strong binding ability and uniform distribution

Pending Publication Date: 2020-09-01
JINAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Therefore, in order to reduce the cost of electroplating and avoid problems such as coarse structure of the Ni-SiC composite coating, uneven particle distribution and weak bonding between the coating and the substrate during the electroplating process, a new type of electrodeposited Ni-SiC composite coating is urgently needed. method

Method used

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  • Method for pulse electrodeposition of Ni-SiC composite coating on surface of aluminum alloy
  • Method for pulse electrodeposition of Ni-SiC composite coating on surface of aluminum alloy
  • Method for pulse electrodeposition of Ni-SiC composite coating on surface of aluminum alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation method of Ni-SiC micron composite coating sample 1 comprises the following steps:

[0038] (1) Preparation of electroplating solution: The composite plating solution is prepared according to the proportion of deionized water and drug powder, and the drug powder and deionized water are fully mixed by mechanical stirring; the duration of mechanical stirring is 3.5h, and the rotation speed 150r / min. The components of the Ni-SiC micro-composite coating bath are: sodium citrate: 110g / L, disodium edetate: 27g / L, nickel sulfate: 220g / L, nickel chloride: 28g / L, boric acid : 18g / L, silicon carbide micron powder with a particle size of 25μm: 50g / L, surfactant sodium stearate: 1.5g / L.

[0039](2) Mechanical leveling and pretreatment of aluminum alloy samples: firstly, use a wire cutting machine to cut the aluminum alloy blanks into flat surface and moderate-sized sheet structures, and then use 300#, 600#, 800#, 1000#, 1500# sandpaper for grinding, and then use em...

Embodiment 2

[0043] The preparation method of Ni-SiC nanocomposite coating sample 2 comprises the following steps:

[0044] (1) Preparation of electroplating solution: The composite plating solution is prepared according to the proportion of deionized water and drug powder, and the drug powder and deionized water are fully mixed by mechanical stirring; the duration of mechanical stirring is 3.5h, and the rotation speed 150r / min. The components of the Ni-SiC nanocomposite coating bath are: sodium citrate: 110g / L, disodium edetate: 27g / L, nickel sulfate: 220g / L, nickel chloride: 28g / L, boric acid : 18g / L, silicon carbide nanopowder with a particle size of 60nm: 50g / L, surfactant sodium stearate: 1.5g / L.

[0045] (2) Mechanical leveling and pretreatment of the aluminum alloy sample: use a wire cutting machine to cut the aluminum alloy blank into a sheet structure with a flat surface and a moderate size. The aluminum alloy samples were polished with 300#, 600#, 800#, 1000#, and 1500# sandpap...

experiment example 3

[0049] The structure and properties of the prepared coating were determined by using SEM, microhardness test, and corrosion resistance test. The experimental results showed that under the condition of mechanical stirring, the Ni-SiC composite coating prepared by pulse power supply had high density, SiC The particles are evenly distributed, with high hardness and excellent wear resistance and wear resistance.

[0050] (1) Surface morphology of Ni-SiC composite coating:

[0051] The surface morphology of the coating was observed with a Phenom XL desktop scanning electron microscope, such as figure 2 , image 3 Shown: in the Ni-SiC micro-composite coating that uses pulse composite electrodeposition technology to prepare in the present invention, SiC particle distributes evenly, does not have obvious cluster phenomenon to produce; In the Ni-SiC nano-composite coating prepared, the grain The degree is finer, and the morphology becomes more uniform and dense. It is also easy to ...

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Abstract

The invention provides a method for pulse electrodeposition of a Ni-SiC composite coating on the surface of an aluminum alloy. According to the method, electroplate liquid comprises sodium citrate, ethylenediamine tetraacetic acid disodium salt, nickel sulfate, nickel chloride, boric acid, silicon carbide particles and a surfactant namely sodium stearate, wherein the pH value of the electroplatingsolution is 5-6, mechanical stirring is carried out in the electrodeposition process, and the current density of electrodeposition is 15-22 A / dm<2>. By means of the method, the Ni-SiC composite coating which is refined, compact, uniform in silicon carbide dispersion and high in content can be obtained, the technical problem that the abrasion resistance of an aluminum alloy is poor is solved, andthe Ni-SiC composite coating which is good in binding force, high in silicon carbide hard particle content, uniform in distribution, high in hardness and good in wear resistance can effectively protect an aluminum alloy sample.

Description

technical field [0001] The invention relates to the technical field of surface modification of metal materials, in particular to a method for pulse electrodepositing a Ni-SiC composite coating on the surface of an aluminum alloy. Background technique [0002] In recent years, with the rapid development of my country's industrial technology, in order to further improve the production efficiency of parts and reduce production costs, the industrial field has put forward higher and more stringent requirements for the performance of materials. For example, high strength, hardness, friction and wear resistance, and corrosion resistance, etc., while maximizing the performance of parts, while minimizing the emission of pollutants harmful to the environment. In the industrial and mining fields with relatively harsh conditions, in order to better protect aluminum alloy equipment, a protective film will be prepared on the surface of aluminum alloy products to improve its surface hardne...

Claims

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Application Information

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IPC IPC(8): C25D15/00C25D5/18C25D3/12C25D5/44C23C18/52C23C28/00C23F1/14
CPCC23C18/52C23C28/32C23F1/14C25D3/12C25D5/18C25D5/44C25D15/00
Inventor 王启伟朱胜李卫李庆阳阳颖飞张鹏王永喆曾大海李双建
Owner JINAN UNIVERSITY
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