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Nickel-base composite coat containing nano diamond and ultrasound wave auxiliary preparation method thereof

A nano-diamond, composite coating technology, applied in coatings, electrolytic coatings, etc., can solve the problems of easy surface defects, poor suspension ability, large particle size, etc., to improve hardness and tribological properties, prolong service life, promote The effect of co-deposition

Inactive Publication Date: 2008-02-13
RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional composite plating technology mostly selects micron, submillimeter or even millimeter solid particles, the particle size is large, the suspension ability in the plating solution is poor, the particle content in the coating is low, the distribution is uneven, and the surface is extremely It is easy to produce defects, and the effect of improving the performance of the metal coating is not very satisfactory

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The nickel-based composite coating containing nano-diamond is prepared by ultrasonic-assisted electroplating method. The anode is made of electrolytic nickel plate or nickel block; the base material is made of carbon steel or alloy steel; the temperature of the composite plating solution is from room temperature to 60°C; electroplating is carried out under constant current conditions with a DC power supply, and the current density is 0.5-5A / dm 2 ; Plating time is 20 to 90 minutes.

[0020] The electroplating process of the composite coating is assisted by ultrasonic waves. The ultrasonic generator is placed at the bottom of the plating tank, the ultrasonic power is 100-500W, and the frequency is 28KHZ-40KHZ. Before electroplating, the nano-composite plating solution needs to be ultrasonically treated for 30 minutes, and the whole process is always assisted by ultrasonic waves from the beginning to the end of electroplating. During the process of nano-composite nickel p...

Embodiment 1

[0022] Take 2g of modified nano-diamond ash powder and add it into 100ml of water, ultrasonically disperse for 30 minutes to obtain a nano-diamond aqueous dispersion, and then prepare a 2L nickel-containing basic plating solution according to the following formula: NiSO 4 ·7H 2 O 250g / L, NiCl 2 ·6H 2 O 45g / L, H 3 BO 4 35g / L. Adding the nano-diamond dispersion into the basic nickel plating solution under medium-speed stirring at 400 r / min to obtain a nanocomposite plating solution. Heat the nanocomposite plating solution to 50°C and ultrasonically disperse for 30 minutes before electroplating. The plated piece is a carbon steel sheet of No. 20, and the anode is an electrolytic nickel plate. The current density is 2A / dm 2 , plating time is 30 minutes. During the electroplating process, the plating solution is always ultrasonically treated, the ultrasonic power is 300W, and the ultrasonic frequency is 28KHZ. A nickel-based composite coating containing nano-diamonds was ob...

Embodiment 2

[0024] Take 2g of modified nano-diamond ash powder and add it into 100ml of water, and use ultrasonic dispersion for 30 minutes to obtain a nano-diamond aqueous dispersion, and then prepare a 2L nickel-containing basic plating solution according to the following formula: NiSO 4 ·7H 2 O 150g / L, MgSO 4 ·7H 2 O 30g / L, NaCl 10g / L, H 3 BO 4 20g / L, saccharin 1g / L, coumarin 0.5g / L, sodium lauryl sulfate 0.1g / L. Adding the nano-diamond dispersion into the basic nickel plating solution under medium-speed stirring at 400 r / min to obtain a nanocomposite plating solution. Heat the nanocomposite plating solution to 40°C and ultrasonically disperse it for 30 minutes before electroplating. The plated piece is a stainless steel sheet, the anode is an electrolytic nickel plate, and the current density is 0.5A / dm 2 , Plating time is 60 minutes. During the electroplating process, the plating solution is always ultrasonically treated, the ultrasonic power is 300W, and the ultrasonic freque...

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Abstract

The invention discloses a nickel-based composite plating layer containing nano diamonds and an ultrasonic auxiliary preparation method for the plating layer. The invention relates to the nickel-based composite plating layer and the preparation method of the plating layer. The nickel-based composite plating layer containing nano diamonds is with metal nickel or nickel alloy as the matrix, and nano diamond grains evenly diffused in. The preparation method includes the following procedures: preparation of the nano composite bath liquid: the nano composite plating layer is prepared in ultrasonic wave. In the plating layer, the nano diamond grains are evenly diffused in the nickel matrix in nano scale, so as to refine the metal grains and obviously improve the hardness and tribological performance of the original nickel plating layer. The invention uses ultrasonic cavitation to make sure of even scattering of the nano diamonds in the bath solution and plating layer, and promotes the codeposition of the nano grains and the metal. The nano composite plating layer can effectively improve the anti-abrasion and abrasion reduction performances of the surface of work pieces, extend the service life of them, and is widely applicable to easily wearable work pieces, such as moulds, all bearings, gears, engines, drive parts, etc.

Description

technical field [0001] The invention relates to a nickel-based composite coating and a preparation method thereof. Background technique [0002] With the development of modern industry, more and more mechanical parts work under complex and harsh conditions, so higher and higher requirements are placed on the surface properties of materials. As an effective surface modification measure, surface coating technology emerged as the times require and has been widely used. In order to improve the overall performance of a single coating, various superhard and anti-friction materials are often used to prepare composite coatings. Composite plating is to add some special inert particles into the plating solution, and make these particles co-deposit with metal or alloy by means of electrochemical or chemical deposition, so as to form a composite coating with special properties. At present, there are mainly two types of second-phase particles added to the plating solution, one is super...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D15/00
Inventor 张欣宇李荣先杨建陈丽琼杨发达
Owner RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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