阅读说明：本技术 一种金包银饰品及其制备方法 (Gold-coated silver ornament and preparation method thereof ) 是由 韩巧荣 杨知知 马长贵 尚修娟 田亚辉 于 2020-05-15 设计创作，主要内容包括：本发明涉及一种金包银饰品,包括银基体、第一隔离层、第二隔离层、镀金层和保护层；所述银基体的外表面从内往外依次设有第一隔离层、第二隔离层、镀金层和保护层；所述银基体为空心或实心；本发明的金包银饰品在镀金层与银基体中间增加第一隔离层和第二隔离层,两个隔离层的作用是阻止镀金层、银基体之间发生扩散,一方面可以保证金、银的成色,另一方面可以防止金层发生褪色,并且在镀金层外面镀覆一层保护层,保护层的作用是提高产品的耐磨性、防油污性,由本发明制备的金包银饰品的维氏硬度可以达到110HV左右,并且其中的金和银的成色均>99.9％,产品具有良好的耐磨和耐腐蚀性能,不会出现起皮、褪色或变色等问题,具有较好的实用性。(The invention relates to a gold-coated silver ornament which comprises a silver substrate, a first isolating layer, a second isolating layer, a gold-plated layer and a protecting layer, wherein the silver substrate is coated with gold; the outer surface of the silver substrate is sequentially provided with a first isolating layer, a second isolating layer, a gold-plated layer and a protecting layer from inside to outside; the silver matrix is hollow or solid; the gold-coated silver ornament has the advantages that the first isolating layer and the second isolating layer are additionally arranged between the gold-coated layer and the silver substrate, the two isolating layers are used for preventing the gold-coated layer and the silver substrate from diffusing, the gold and silver colors can be ensured on one hand, the gold layer can be prevented from fading on the other hand, the protective layer is plated on the outer surface of the gold-coated layer, the protective layer is used for improving the wear resistance and the oil stain resistance of the product, the Vickers hardness of the gold-coated silver ornament prepared by the method can reach about 110HV, the gold and silver colors are greater than 99.9%, the product has good wear resistance and corrosion resistance, the problems of peeling, fading or color change and the like cannot occur, and the gold-coated silver ornament has good practicability.)

1. A gold-coated silver ornament is characterized in that: comprises a silver substrate, a first isolating layer, a second isolating layer, a gold-plated layer and a protective layer; the outer surface of the silver substrate is sequentially provided with a first isolation layer, a second isolation layer, a gold-plated layer and a protection layer from inside to outside.

2. The gold-coated silver ornament of claim 1, wherein: the silver matrix is hollow or solid.

3. The gold-coated silver ornament of claim 1, wherein: the first isolation layer is of a single-layer/multi-layer structure.

4. The gold-coated silver ornament of claim 3, wherein: each layer of the first isolation layer is made of one or an alloy of gold, silver, platinum, palladium, rhodium, iridium, zinc, ruthenium, titanium and zirconium.

5. The gold-coated silver ornament of claim 1, wherein: the second isolation layer is of a single-layer/multi-layer structure.

6. The gold-coated silver ornament of claim 1, wherein: each layer of the second isolation layer is made of one of gold, silicon nitride, titanium nitride, aluminum nitride, zirconium nitride, titanium carbide and titanium aluminum nitride.

7. The gold-coated silver ornament of claim 1, wherein: the weight percentage of the gold in the gold-plated layer and the weight percentage of the silver in the silver matrix are both 99.9-99.99%.

8. The gold-coated silver ornament of claim 1, wherein: the protective layer is of a single-layer/multi-layer structure.

9. The gold-coated silver ornament of claim 1, wherein: each layer of the protective layer is composed of one of fluoride, nitride, silicide and silicon-aluminum oxide.

10. The method for preparing gold-coated silver ornaments according to claim 1, characterized in that: the method comprises the following steps:

step1, preparing a silver matrix;

step3, plating a first isolating layer on the surface of the silver substrate, wherein the thickness is 0.01-5 μm;

step3 plating a second isolation layer on the first isolation layer to a thickness of 0.01-5 μm;

step4, plating a gold layer on the second isolation layer, wherein the thickness is 1-100 μm;

and Step5, forming a protective layer on the gold-plated layer, wherein the thickness is 0.0002-0.1 μm, and finally obtaining the gold-coated silver ornament.

Technical Field

The invention relates to the technical field of precious metal ornament manufacturing, in particular to a gold-coated silver ornament and a preparation method thereof.

Background

The gold ornaments have the characteristics of bright color, good corrosion resistance and the like, are popular with consumers, but the expensive price of the gold ornaments is very prohibitive for many people, and in order to meet the requirements of people, many gold imitation ornaments or gold plating ornaments appear in the market, have the color of the gold ornaments, and have the price within the bearable range of wide consumers. However, the gold-like or gold-plated products are easy to have the problems of peeling, fading or discoloration after being worn for a period of time, and some products even cause allergic reaction of the skin, thereby bringing inconvenience to daily use of users and being not beneficial to large-scale application.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a gold-coated silver ornament which has high gold and silver color and hardness, good wear resistance and corrosion resistance and does not have the problems of peeling, fading or discoloration and the like after being worn for a long time, and a preparation method thereof.

In order to achieve the purpose, the invention adopts the technical scheme that: a gold-coated silver ornament comprises a silver substrate, a first isolation layer, a second isolation layer, a gold-plated layer and a protection layer; the outer surface of the silver substrate is sequentially provided with a first isolation layer, a second isolation layer, a gold-plated layer and a protection layer from inside to outside.

Further, the silver matrix is hollow or solid.

Further, the first isolation layer is of a single-layer/multi-layer structure.

Further, each layer of the first isolation layer is made of one of gold, silver, platinum, palladium, rhodium, iridium, zinc, ruthenium, titanium and zirconium or an alloy thereof.

Further, the second isolation layer is of a single-layer/multi-layer structure.

Further, each layer of the second isolation layer is made of one of gold, silicon nitride, titanium nitride, aluminum nitride, zirconium nitride, titanium carbide and titanium aluminum nitride.

Furthermore, the weight percentage of the gold in the gold-plated layer and the weight percentage of the silver in the silver matrix are both 99.9-99.99%.

Further, the protective layer is of a single-layer/multi-layer structure.

Furthermore, each layer of the protective layer is one of fluoride, nitride, silicide and silicon-aluminum oxide.

A preparation method of a gold-coated silver ornament comprises the following steps:

step1, preparing a silver matrix;

step3, plating a first isolating layer on the surface of the silver substrate, wherein the thickness is 0.01-5 μm;

step3 plating a second isolation layer on the first isolation layer to a thickness of 0.01-5 μm;

step4, plating a gold layer on the second isolation layer, wherein the thickness is 1-100 μm;

and Step5, forming a protective layer on the gold-plated layer, wherein the thickness is 0.0002-0.1 μm, and finally obtaining the gold-coated silver ornament.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

the gold-coated silver ornament prepared by the method has the following advantages:

the color of gold and silver is more than 99.9%.

And the Vickers hardness of the product can reach about 110 HV.

And the product has good wear resistance and corrosion resistance.

And fourthly, the problems of peeling, fading or discoloration and the like do not occur after the long-term wear, and the long-term wear can be realized.

Drawings

The technical scheme of the invention is further explained by combining the accompanying drawings as follows:

FIG. 1 is a schematic structural view of a gold-coated silver ornament in accordance with the present invention;

FIG. 2 is a comparison of vacuum heating tests of first barrier layers of different samples;

FIG. 3 is a graph comparing the wear resistance effect of a second barrier layer of a different article;

FIG. 4 is a graph comparing the wear resistance effect of protective layers of different samples;

FIG. 5 is a comparison graph of the gold and silver coloration for samples of different gold plating layer thicknesses;

FIG. 6 is a graph comparing Vickers hardness of different samples;

FIG. 7 is a graph of the vulcanization resistance test behavior of various samples;

wherein: silver base member 1, first isolation layer 2, second isolation layer 3, gold-plated layer 4, protective layer 5.

Detailed Description

The invention is described in further detail below with reference to the figures and the embodiments.

Referring to fig. 1, the gold-coated silver ornament of the present invention includes a silver substrate 1, a first isolation layer 2, a second isolation layer 3, a gold-plating layer 4 and a protection layer 5; the outer surface of the silver substrate 1 is sequentially provided with a first isolation layer 2, a second isolation layer 3, a gold-plated layer 4 and a protection layer 5 from inside to outside.

As a further preferred embodiment, the silver matrix 1 is hollow or solid, and the weight percentage of the silver in the silver matrix 1 is 99.9-99.99%.

As a further preferred embodiment, the first isolation layer 2 may be a single layer, or may be two or more layers, and the composition of each layer may be one of gold, silver, platinum, palladium, rhodium, iridium, zinc, ruthenium, titanium, and zirconium, or an alloy thereof; the first isolating layer can prevent silver in the silver substrate from diffusing to the gold plating layer, so that the color of gold and silver can be ensured, and the color fading of the gold layer can be prevented.

As a further preferred embodiment, the second isolation layer 3 may be a single layer, or may be two or more layers, and each layer has one of gold, silicon nitride, titanium nitride, aluminum nitride, zirconium nitride, titanium carbide, and titanium aluminum nitride; wherein the second isolating layer can increase the wear resistance of the gold-coated hard ornament.

As a further preferred embodiment, the material of the protective layer 5 may be a single layer, or two or more layers, each layer is composed of one of fluoride, nitride, silicide, and silicon-aluminum oxide, and the protective layer has the characteristics of water resistance, oil resistance, scratch resistance, fingerprint resistance, pollution prevention, easy cleaning, and the like, and can improve the corrosion resistance and the discoloration resistance of the product.

In addition, the invention also discloses a preparation method of the gold-coated silver ornament, which comprises the following steps:

step1: the silver matrix is prepared by a fusion casting or calendering method, wherein the weight percentage content of the silver is 99.9-99.99%.

Step 2: and forming a first isolating layer on the surface of the silver substrate by adopting an electroplating or chemical plating process, wherein the thickness of the first isolating layer is 0.01-5 mu m.

Step3: and forming a second isolation layer with a thickness of 0.001-0.5 μm on the first isolation layer by vacuum coating or electroplating process.

Step4: and forming a gold-plated layer on the second isolation layer by a cyanide-free electroplating process, wherein the gold in the gold-plated layer accounts for 99.9-99.99% by weight and has a thickness of 3-100 mu m.

Step5: and forming a transparent protective layer with a thickness of 0.0002-0.1 μm on the gold-plated layer by physical vapor deposition or electrophoresis.

Several examples are described below.