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Method for in-situ molten-salt electrodeposition of tungsten carbide/tungsten composite coating

A composite coating and electrodeposition technology, used in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of high oxygen content, no reports of tungsten carbide/tungsten composite coatings, weak crystallinity and matrix adhesion. , to achieve the effect of low cost, complete grain and dense structure

Active Publication Date: 2019-01-15
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, from the perspective of fast deposition speed and high product quality, the process of preparing tungsten carbide / tungsten composite coatings by chemical vapor deposition (CVD) and plasma spraying (PS) is close to maturity, but the prepared tungsten carbide / tungsten composite coating There are still some deficiencies in the coating, such as weak crystallinity and matrix binding force, and high oxygen content; while in the process of molten salt electroplating, the coating and the surface of the plated piece diffuse fully, the binding ability is improved, and the cathode continuously occurs Electrodeoxidation reaction ( reduction reaction), so the oxygen content is low. In addition, the coating obtained by electrodeposition has good crystallinity and complete and dense grains.
[0006] So far, there have been no relevant reports on in-situ electrodeposition of tungsten carbide / tungsten composite coatings from molten salts

Method used

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  • Method for in-situ molten-salt electrodeposition of tungsten carbide/tungsten composite coating
  • Method for in-situ molten-salt electrodeposition of tungsten carbide/tungsten composite coating
  • Method for in-situ molten-salt electrodeposition of tungsten carbide/tungsten composite coating

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Embodiment 1

[0037] The embodiment of the present invention provides a method for in-situ electrodeposition of tungsten carbide / tungsten composite coating with molten salt, using waste tungsten carbide as auxiliary electrode, molybdenum plate as working electrode, and in-situ electrodeposition process by constant current step method preparation.

[0038] Specifically, include the following steps:

[0039] S1. Carry out simple mechanical cutting of waste tungsten carbide to obtain a suitable size, and mechanically polish it, soak it in lye for 20 minutes, then clean it with deionized water, ultrasonically clean it in acetone and alcohol, and dry it for later use;

[0040] S2, mechanically grinding and polishing the molybdenum plate until the surface is smooth, soaking in lye for 20 minutes, cleaning with deionized water, ultrasonic cleaning in acetone and alcohol, and drying for later use;

[0041] S3, the Na 2 WO 4 Pre-dried in a vacuum oven at 300°C for 12 hours, dehydrated, and weighe...

Embodiment 2

[0047] The embodiment of the present invention provides a method for in-situ electrodeposition of tungsten carbide / tungsten composite coating in molten salt, with the aid of waste WC-6Co cemented carbide (tungsten carbide-cobalt cemented carbide with a cobalt content of 6wt%) Electrode, with copper plate as working electrode and platinum wire as reference electrode, was prepared by constant potential step method in-situ electrodeposition process.

[0048] Specifically, include the following steps:

[0049] S1. Carry out simple mechanical cutting of waste WC-6Co cemented carbide to obtain a suitable size, and mechanically polish it, soak it in lye for 20 minutes, then clean it with deionized water, ultrasonically clean it in acetone and alcohol, and dry it spare;

[0050] S2. Mechanically grind and polish the copper plate until the surface is smooth, soak it in lye for 20 minutes, then clean it with deionized water, ultrasonically clean it in acetone and alcohol, and dry it fo...

Embodiment 3

[0054] The embodiment of the present invention provides a method for in-situ electrodeposition of tungsten carbide / tungsten composite coating with molten salt, using waste tungsten carbide as auxiliary electrode, stainless steel plate as working electrode, and in-situ electrodeposition process by constant current step method preparation.

[0055] Specifically, include the following steps:

[0056] S1. Carry out simple mechanical cutting of waste tungsten carbide to obtain a suitable size, and mechanically polish it, soak it in lye for 20 minutes, then clean it with deionized water, ultrasonically clean it in acetone and alcohol, and dry it for later use;

[0057] S2. The stainless steel plate is mechanically ground and polished until the surface is smooth, soaked in lye for 20 minutes, then cleaned with deionized water, ultrasonically cleaned in acetone and alcohol, and dried for later use;

[0058] S3, will K 2 WO 4 and KF are pre-dried in a vacuum oven at 300°C for 24 hou...

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Abstract

The invention discloses a method for in-situ molten-salt electrodeposition of a tungsten carbide / tungsten composite coating. According to the method, under the protection of an inert gas, a tungstatesystem is used as a molten salt electrolyte, tungsten carbide or tungsten carbide-cobalt hard alloy is used as an auxiliary electrode, a conductive plated part having undergone grinding and polishingis used as a working electrode, and heat for melting, heat-preserved treatment and in-situ electrodeposition are successively performed to obtain the tungsten carbide / tungsten composite coating. The method for preparing the tungsten carbide / tungsten composite coating through an in-situ molten-salt electrodeposition process in the invention has the characteristics of high efficiency and short preparation process flow; the tungstate system is used as the molten salt electrolyte, and the tungstate system has low volatility, can accelerate the electrochemical dissolving speed of the auxiliary electrode, is beneficial for improving the recycling rate of the auxiliary electrode and can process curved surfaces and workpieces with complex shapes such as inner bores; at the same time, process equipment is simple in structure, easy to operate, and low in cost and pollution; the prepared composite coating has a dense structure, intact crystal grains, high bonding strength, a flat surface, high hardness and good wear resistance; the improvement of the performance of the tungsten coating is realized; and the method is of great theoretical and practical significance.

Description

technical field [0001] The invention belongs to the technical field of molten salt electroplating, and relates to a preparation method of a composite coating, in particular to a method for in-situ electrodeposition of a tungsten carbide / tungsten composite coating by molten salt. Background technique [0002] Tungsten-cobalt cemented carbide has extremely high hardness and strength. It is widely used in industry and is known as "the tooth of industry". With its large-scale application in industry, it is facing a large number of scrap. The full recycling of cemented carbide is of great significance to the development of circular economy. [0003] Although pure tungsten coating has certain hardness, strength and wear resistance, under complex working conditions, composite tungsten coating with tungsten carbide as reinforcement has more advantages. Compared with pure tungsten coating, composite tungsten coating has more advantages. The coating has higher hardness and strength, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/66C25D21/12C25D17/10
CPCC25D3/66C25D17/10C25D21/12
Inventor 席晓丽张青华马立文聂祚仁秦文轩
Owner BEIJING UNIV OF TECH
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