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Video: ❶ What Is Blackening And How Does It Happen
2024 Author: Madeline Holiday | [email protected]. Last modified: 2023-12-16 18:57
Blackening is one of the decorative coating methods. Its essence is to give the treated surface a strong and durable coating that is resistant to various influences. Most often, silver alloys are processed in this way. This metal produces the strongest color contrast. Sometimes blackening of gold is carried out. Mobile does not hold on to other metals. Location: Location:
Blackening method
There are several ways to blacken metal. The most traditional is oxidation. This is the treatment of the metal surface with a liquid solution of sulfates. As a result of oxidation, a thin black oxide film is formed on the surface. In addition to it, the method of galvanic blackening is used, during which a thin layer is applied with the help of an electrolyte, which performs two functions at once: protective and decorative. In the old days, blackening of metal was carried out by firing in oil. The metal was first heated red-hot, then dipped in an oil solution and fired again until the oil burned out. With repeated repetition of this procedure, the product acquired a noble black color.
As for blackening in the jewelry industry, it is carried out not only by electroplating, but also by a chemical method. The simplest option is mechanical blackening using a graphite mixture, it is rubbed into the relief surface of the product, thereby emphasizing the beauty and originality of the pattern.
Blackening technique
The blackening mixture is made in a porcelain mortar. Liquid ammonia is used as a flux. The result is a fine-grained gruel. To begin with, the surface is pretreated from dirt. Using a brush, the recesses of the surface are filled with the prepared mixture, tamping with a spatula. In this case, the grooves are filled above the edge of the pattern. After evaporation of moisture, the product is placed in a muffle furnace heated to a temperature of 150 ° C. At a temperature of 300-400 ° C, the black begins to melt and fill the recesses of the pattern.
After the mobile has filled all the recesses, the product is removed from the oven. It is important to do this on time, since overheating can lead to burnout of sulfur, and the layer will turn out to be porous. The finishing of the mobile is carried out with a file. It is etched, smoothed with emery, sanded and polished using pumice powder. So the product becomes truly original.
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