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Composite coating for repairing surface of silver coin or souvenir medal and preparation method of composite coating

A composite coating and surface repair technology, applied in coating, sputtering, ion implantation, etc., can solve problems such as affecting the bonding force between pure silver coating and substrate, inconsistent coating color and gloss, and inability to achieve recovery effects. , to achieve the effect of good coverage and adhesion, excellent corrosion resistance and consistent thickness

Pending Publication Date: 2021-12-14
SHENYANG MINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the surface defects of silver coins, as well as the different roughness and different grain orientations of different regions, it is difficult for the pure silver coating to grow uniformly and uniformly on the surface of silver coins, thus forming a gap in the thickness and orientation of the coating, which in turn leads to different areas. Inconsistencies in the color and luster of the coating
In addition, if there are impurity areas such as white spots, yellowing, and black spots on the surface of damaged silver coins caused by corrosion, these impurities are prone to internal corrosion, which seriously affects the bonding force between the pure silver coating and the substrate, and the coating is easy to peel off.
Unable to achieve ideal recovery effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The mold production process produces surface wiring and scratch unqualified silver coins, silver coins have a diameter of 40 mm, and the surface has a plurality of scratches, and the depth is measured by a laser confocal microscope to 20-100 nanometers, and the wipe area is about 6 square millimeters.

[0028] Waiting to repair the silver coin: At room temperature, the silver coin is sequentially washed once in anhydrous ethanol, anhydrous acetone, and deionized water. After 10 minutes, the last cleaning will be blown away from dry air after cleaning;

[0029] Vacuum: Place the silver coin into the vacuum cavity, and the earth is soaked to less than 0.001 Pa.

[0030] Target cleaning: 2 silver, chromium, pure element target, co-sputter, to the vacuum chamber to 0.2 Pa, 0.2 ppa, in silver, chrome magnetron sputtering target 200 volt flow negative bias, so that the target arc, sputter for 10 minutes, ensuring that the natural oxide film on the surface of the target is cleaned...

Embodiment 2

[0035] Silver coins that are discolored in the back surface, the silver coin surface is overall, lost pure silver, and disallillating uneven.

[0036] Waiting to repair the silver coins: At room temperature, the silver coin is sequentially cleaned in anhydrous ethanol, anhydrous acetone, and deionized water. After 5 minutes, the last cleaning will be blown away from dry air after cleaning;

[0037] Vacuum: Place the silver coin into the vacuum cavity, and the earth is soaked to less than 0.003 p.

[0038] Target cleaning: use silver, nickel, nickel-pure element target, co-sputter, 3% purity of 99.99% to 1 ppa, in silver, nickel magnetron sputtering target The 600 volt flow negative bias is biased, and the target is arc, sputtering for 10 minutes, ensuring that the natural oxide film on the surface of the target is cleaned, and the baffle is placed at about 1 cm above the silver coin sample stage, preventing sputtering The resulting particles are deposited to the surface of the silve...

Embodiment 3

[0043] After the corrosion of sulfur and chlorine in the atmosphere, the silver coins of white spots and black dots are produced, the white spot area is 4-10 square millimeters, and the relative height of the original surface is 40-150 nanometers, and the average area of ​​the black spot is 1-5. Sparters, relative to the original surface of 20-50 nm.

[0044] Waiting to repair the silver coins: At room temperature, the silver coin is sequentially washed 3 times in anhydrous ethanol, anhydrous acetone, and deionized water. After 5 minutes, the last cleaning will be blown away from dry air after the last cleaning;

[0045] Vacuum: Place the silver coin into the vacuum cavity, and the earth is soaked to less than 0.005 Pa.

[0046] Washing of the target: Silver, silicon is sputtered, and the purity of 99.9% high purity is 99.9% high purity argon to 0.4 Pa, and the silicon magneised sputter target is applied to the vacuum chamber. 300 and 500 volts are negatively biased, allowing the ...

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Abstract

The invention relates to a silver-based amorphous alloy and nanocrystalline pure silver composite coating for repairing the surface of a silver souvenir coin or medal and a preparation method of the composite coating. The composite coating comprises a silver-based amorphous alloy coating serving as a substrate and a nanocrystalline pure silver coating on the surface; and the silver-based amorphous alloy coating comprises a silver component and an active metal component, and representative active elements suitable for the silver-based amorphous alloy coating comprise chromium, nickel, silicon and the like. The preparation method comprises the following steps: cleaning the silver coin and a magnetron sputtering target material, preparing the composite coating through magnetron sputtering deposition in a vacuum state, and post-processing the target material and the silver coin. By means of the silver-based amorphous alloy and nanocrystalline pure silver composite coating and the preparation method thereof, damaged silver coins with scratches, abrasion and color spots and the height difference smaller than 2 micrometers from the original surface can be repaired, the surface of the repaired silver coins is covered with the composite coating uniform in component and compact in structure, good binding force exists between the silver coins and the composite coating, and the appearance color is the same as that of pure silver. The problems that tiny scratches, abrasion and other flaws are generated on the surfaces of the silver coins in the production, storage and circulation processes, black spots, white spots, yellowing and other flaws are formed on the surfaces of the silver coins due to the influence of sulfur, chlorine, oxygen and other corrosion elements in the environment, and therefore the appearance and luster of the silver coins are seriously influenced are solved.

Description

Technical field: The invention relates to a silver-based amorphous alloy + nanocrystalline pure silver composite coating and a preparation method for repairing the surface of silver commemorative coins or silver products, and belongs to the surface protection technology of silver coins and pure silver products. Background technique: In the process of production, storage and circulation of silver coins and silver products, the surface is prone to micro scratches and wear and other defects, which are easily affected by corrosive elements such as sulfur, chlorine and oxygen in the environment, which can easily lead to black spots, white spots and yellowing on the surface. Defects that seriously affect the appearance of silver coins. As a precious handicraft for viewing and collection purposes, its appearance and color have a major impact on its value. There is still no good solution to the problem of surface quality damage during the production, storage and circulation of silv...

Claims

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Application Information

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IPC IPC(8): C22C45/00C23C14/35C23C14/02C23C14/16
CPCC22C45/003C23C14/352C23C14/165C23C14/35C23C14/021
Inventor 王菲姚佳昊郭毅张吉刚胡云明张晓男朱慕平梁军
Owner SHENYANG MINT CO LTD
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