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Silver particle surface passivation treatment method

A technology of passivation treatment and silver particles, which is applied in jewelry and other fields, and can solve the problem of non-existence of passivation on the surface of metal particles

Pending Publication Date: 2021-10-01
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is currently no prior art for surface passivation of metal particles

Method used

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  • Silver particle surface passivation treatment method

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1 silver particle surface passivation treatment method A, technological process is as figure 1 As shown, wherein 1-silver particles, 2-solution containing passivation solution, 3-anode, 4-conductive porous mesh graphene electrode, 5-passivation layer, 6-mechanical stirring, 7-ultrasound of specific frequency.

[0035] (1) the silver particles of average size 100nm are dispersed in the solution containing passivation solution; the pH value of the solution containing passivation solution is 3, the solvent is ethanol, and the solute is H 2 o 2 、Cr 3+ 、Cr 6+ , SO 4 2- , Cl - , NO 3 - Mixtures of ions and alkali metal ions;

[0036] (2) mechanically stirring the solution, inserting graphite in the solution as an anode, inserting a conductive porous mesh graphene electrode with an aperture of 80 nm as a negative electrode, so that silver particles are attached to the conductive porous mesh graphene electrode;

[0037] (3) The solution is energized, and the...

Embodiment 2

[0039] Embodiment 2 silver particle surface passivation treatment method B, technological process such as figure 2 As shown, 1-silver particles, 2-solution containing passivation solution, 3-anode, 5-passivation layer, 6-mechanical stirring, 7-ultrasound with specific frequency, 8-water circulation made by pump, 9- Large aperture mesh graphene electrode, 10-medium aperture graphene mesh electrode, 11-small aperture mesh graphene electrode, 12-flip graphene electrode.

[0040](a) Disperse silver particles of 140nm, 110nm, and 80nm in a solution containing passivation solution, and put the solution in a closed container; the pH value of the solution containing passivation solution is 7, the solvent is methanol, and the solute is acrylic acid Resin, Cr 3+ 、Cr 6+ , SO 4 2- , Cl - , NO 3 - Mixtures of ions and alkali metal ions;

[0041] (b) The solution in the container is mechanically stirred, and an inert electrode is inserted into the solution from the side of the cont...

Embodiment 3

[0046] Other steps are the same as in Example 1, and the difference is that after the passivation process in step (3) finishes, the conductive porous mesh graphene electrode is taken out and placed in another solution, and hexadecane bromide is added in the other solution Trimethylammonium trimethylammonium (CTAB) and fatty acid salt small molecule surfactants reduce the surface energy of silver particles and promote the shedding of silver particles; apply ultrasonic vibration to make the passivated silver particles fall off; repeat the operation until all silver particles are passivated ; Then another solution is centrifugally dried to obtain passivated silver particles.

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Abstract

The invention belongs to the field of electronic packaging materials, and discloses a silver particle surface passivation treatment method. The method comprises the following steps that silver particles are dispersed in a passivation solution, an inert electrode is inserted as an anode, a conductive porous mesh graphene electrode is inserted as a cathode, and the silver particles are attached to the conductive porous mesh graphene electrode; the solution is electrified to enable Cr to be deposited on the surfaces of the silver particles on the conductive porous mesh graphene electrode, so that the surfaces of the silver particles are passivated; ultrasonic oscillation or a high-frequency electric field is applied to the conductive porous mesh graphene electrode, so that the passivated silver particles fall off; then new silver particles which are not passivated are attached to the conductive porous mesh graphene electrode again, and the steps of electrifying and applying the ultrasonic oscillation or the high-frequency electric field are repeated till all the silver particles are passivated; and the solution is centrifugally dried to obtain passivated silver particles. According to the method, more than three conductive porous mesh graphene electrodes can be used as cathodes and filter screens to treat the silver particles with different particle sizes.

Description

technical field [0001] The invention belongs to the field of electronic packaging materials, in particular to a silver particle surface passivation treatment method. Background technique [0002] Nanoscale and microscale metal particles are key interconnect materials in electronic packaging, however, due to their small particle size, they are prone to oxidation, which limits their further applications. Passivating the metal to form a dense anti-oxidation film on its surface is an important solution and is widely used. The principle is to electrify the metal in the passivation solution and form a passivation film. However, for micro-nano metal particles, how to realize the electrification of the particles, how to achieve uniform passivation, and how to collect the passivated metal particles are all problems that need to be solved. Therefore, there is currently no prior art for surface passivation of metal particles. Contents of the invention [0003] In order to overcome...

Claims

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Application Information

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IPC IPC(8): C25D7/00C25D3/04
CPCC25D7/00C25D3/04C25D7/006
Inventor 杨冠南刘昱彤崔成强张昱
Owner GUANGDONG UNIV OF TECH
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