Vacuum gold plating with vacuum coating equipment
Electroplated gold bars are just a layer of gold. It's just that there is a layer of gold on the outside, and there are other gold inside, which may be silver, copper, or even worthless iron. Whether gold plating and gold are of the same grade depends on whether the gold plating is made of the same material or different materials. If it is gold plating of the same material, it is the same grade; Gold with the highest purity is also called 24K gold, so it is higher than gold. At present, there is a method called "vacuum plating", which can make the surface gold plating more durable and firm. This method mainly includes vacuum evaporation, sputtering and ion plating. They are used to deposit various metallic and non-metallic films on the surface of plastic parts by distillation or sputtering under vacuum. In this way, a very thin surface coating can be obtained, and it has the outstanding advantages of high speed and good adhesion. But the price is also high. There are few kinds of metals that can be operated. They are generally used.
The quality of gold plating depends on the thickness and brightness of the gold plating layer. The international standard for gold-plated jewelry is: the plating thickness of good gold-plated jewelry is 10-25 microns, and that of general gold-plated jewelry is 2-3 microns. If the plating thickness is less than 0.18 μ m, it can not be called "gold plating", but "gold plating", which is a cheap jewelry process.
From the concentration of the gold plating solution, the gold plating solution with water is generally acidic, and its gold content is low, up to 0.4 ~ 0.5g/l. The cost of this solution is low, so the loss caused by the solution is less. The color of the gold layer obtained from the plating solution is blue gold, which is especially suitable for buttons, belt buckles and other hardware., The electroplating batch is large, the processing cost is low, and gold plating is required.
Vacuum 24K gold plating is to inject argon into the gold target in a vacuum state, and the argon strikes the gold target to separate the gold target into molecules. The molecules are adsorbed by the conductive plated metal, and the surface forms a uniform and smooth surface.
The vacuum plated 24K gold is pure gold with a gold content of 99.998%. Its appearance is golden yellow and its chemical stability is high. Therefore, 24K gold electroplating is often used as a decorative coating, mainly for jewelry production.
Vacuum plated 24K gold jewelry needs good maintenance when it is worn, because it is easy to be stained with sweat on the upper surface, which will cause chemical reaction, fade the gold plating and affect the beauty. So when you wear it, you often wipe it with cotton cloth.
24K is the color code of gold products, not gold plating. Pure gold is also called pure gold. The purity is expressed in K, so the gold with the highest purity is also called 24 K gold, which means that the gold content has reached more than 99.6%. The gold with high purity is very soft. It will deform when you pinch it gently. It is the most valuable.
Theoretically, 100% pure gold can be called 24K gold, but in reality, there can be no 100% gold. Therefore, China stipulates that gold with a content of more than 99.96% can be called 24K gold, that is, 24K is pure gold.
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