Dispersed pulse electroplating method for heavy powder

A pulse electroplating and powder technology, applied in coating, transportation and packaging, metal processing equipment, etc., can solve the problems of unfavorable large-scale production, pump jamming, easy precipitation, etc., and achieve low cost, simple process and complete coating Effect

Active Publication Date: 2019-01-11
湖南鋈鎏科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the increased specific gravity of graphite powder after copper plating, it is easy to precipitate. When a large amount of copper-coated graphite powder is deposited in the circulating pump

Method used

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  • Dispersed pulse electroplating method for heavy powder
  • Dispersed pulse electroplating method for heavy powder
  • Dispersed pulse electroplating method for heavy powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) Pretreatment: add 1L degreasing agent to 12g tungsten powder, mix well, then conduct ultrasonic degreasing treatment at 80°C, 400kHz, under stirring for 1h, wash with water, dry, and put the degreased tungsten powder in In a nitric acid solution with a mass concentration of 30%, at room temperature, at 400kHz, perform ultrasonic stirring pickling and activation treatment for 10 minutes, wash with water, and vacuum dry at 70°C and -0.07MPa for 2 hours to obtain pretreated tungsten powder; in the degreasing agent The concentration of each component is: sodium hydroxide 120g / L, alkylphenol polyoxyethylene ether 8g / L, sodium dodecylsulfonate 4g / L, trisodium phosphate 80g / L;

[0057] (2) Dispersed pulse intermittent electroplating: put 10g of the pretreated tungsten powder obtained in step (1) into an electrolytic tank filled with 1L of copper plating solution, at 40°C, the on-off ratio is 2.5:1, that is, the single pulse time is 2.5 min, the interval time of a single pu...

Embodiment 2

[0063] (1) Pretreatment: add 1L of degreasing agent to 20g of graphite powder, mix well, then conduct ultrasonic degreasing treatment at 90°C, 500kHz, under stirring for 0.5h, wash with water, dry, and degreasing graphite powder In a nitric acid solution with a mass concentration of 50%, at room temperature, at 500kHz, perform ultrasonic pickling and activation treatment for 8 minutes, wash with water, and vacuum dry at 60°C and -0.08MPa for 1 hour to obtain pretreated graphite powder; in the degreasing agent The concentration of each component is: sodium hydroxide 140g / L, alkylphenol polyoxyethylene ether 6g / L, sodium dodecylsulfonate 5g / L, trisodium phosphate 75g / L;

[0064](2) Dispersed pulse intermittent electroplating: put 15g of the pretreated graphite powder obtained in step (1) into an electrolytic tank filled with 1L of nickel plating solution, at 45°C, the on-off ratio is 2:1, that is, the single pulse time is 2min , the interval time of a single pulse is 1min, the n...

Embodiment 3

[0070] (1) Pretreatment: add 1L of degreasing agent to 15g of graphite powder, mix well, then conduct ultrasonic degreasing treatment at 60°C, 300kHz, under stirring for 1.5h, wash with water, dry, and remove the degreasing graphite powder In a nitric acid solution with a mass concentration of 40%, at room temperature and at 300kHz, perform ultrasonic pickling and activation treatment for 12min, wash with water, and vacuum dry at 60°C and -0.09MPa for 1.5h to obtain pretreated graphite powder; the degreasing agent The concentration of each component in the product is: sodium hydroxide 110g / L, alkylphenol polyoxyethylene ether 9g / L, sodium dodecylsulfonate 3g / L, trisodium phosphate 85g / L;

[0071] (2) Dispersed pulse intermittent electroplating: put 8g of the pretreated graphite powder obtained in step (1) in an electrolytic tank filled with 1L of copper plating solution, at 35°C, the on-off ratio is 2:1, that is, the single pulse time is 2min , the interval time of a single pu...

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Abstract

The invention relates to a dispersed pulse electroplating method for heavy powder. The dispersed pulse electroplating method comprises the following steps of (1) pretreatment, wherein the heavy powderis subjected to degreasing, water washing, drying, pickling activation, water washing and vacuum drying to obtain pretreated heavy powder; (2) dispersed pulse intermittent electroplating, wherein thepretreated heavy powder is placed in an electrolytic bath containing a metal plating solution to be subjected to pulse intermittent electroplating, filtration and washing so as to obtain a crude product with the heavy powder coated with metal; and (3) passivation treatment, wherein immersion passivation, vacuum filtration and vacuum drying are carried out to obtain metal coated heavy powder. A coating layer of the metal coated heavy powder obtained by the method has strong binding ability to the powder, coating is complete, the coating layer is uniform in thickness, compact and pure, the powder is not agglomerated, uniform dispersion is achieved, and the metal content and the coating ratio are both better than those of existing chemical plating and electroplating technologies. The methodis simple in process, low in cost, high in production efficiency and suitable for industrial production.

Description

technical field [0001] The invention relates to an electroplating method, in particular to a dispersed pulse electroplating method for heavy powder. Background technique [0002] With the continuous development and progress of science and technology and industry, the requirements for the mechanical properties of materials are gradually increasing. Metal-clad composite materials have the advantages of both "core" and "shell" materials, and have attracted the attention of researchers due to their excellent performance. There are more and more reports on composite materials with core-shell clad structures. [0003] The composite powder of nickel, copper, cobalt and other metal-coated powders can combine the high wear resistance, high hardness, ductility and magnetic properties of the surface metal and powder at the same time, and has attracted widespread attention. However, due to the large difference in interfacial energy between these electroplated metals and most of the coa...

Claims

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Application Information

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IPC IPC(8): C25D7/00C25D5/18C25D5/48B22F1/02C25D5/22
CPCC25D5/18C25D5/22C25D5/48C25D7/00B22F1/17
Inventor 李兵余刚李宁周保平冉敏李林曾凡亮
Owner 湖南鋈鎏科技有限公司
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