Oxidation of parts
Silver products, or products with a silver coating, are processed by a chemical or electrochemical method. This processing process is called oxidation. Chemical and electrochemical oxidation processes are carried out in special solutions and electrolytes, the main component of which is potassium dichromate.
There are processes of colorless and colored oxidation. Color oxidation gives processed objects different shades of color: black, brown, gray, blue, and others. Finished oxidized products are polished with soft brass brushes to give a natural shine. A high-quality oxidized surface should be uniform, even, without color transitions.
The thermal method of oxidizing metals is carried out by heating the product with water vapor or oxygen. For example, such a type of oxidation as bluing is applied to low-alloy types of steel and iron, and is carried out in furnaces with a temperature of 300-350 ° C, or during air heating of the product to the required color. Alloyed types of steel are oxidized at a temperature of 400-700 ° C. Iron-nickel alloys undergo oxidation by processing at 400-800 ° C for 30-90 minutes. Thermal oxidation is the most important operation of planar technology. Dielectric films formed during oxidation protect semiconductor structures from the influence of external factors and isolate active areas of discrete semiconductors and integrated circuits. Most often, similar oxidation is used to manufacture silicon structures. In the early 1980s, during the production of large silicon integrated circuits, oxidation was carried out at high pressure.
The chemical method of oxidizing metals is used for surface passivation to prevent corrosion, as well as for applying decorative layers to non-ferrous and ferrous metals. Before chemical oxidation, the future product is treated with oxidizing melts and solutions. Upon completion of oxidation, the product is rinsed, dried, sometimes oiled and treated with oxidizers.
Electroplating is another method of oxidation. It is widely used in the production of electronic elements and radio components. Electroplating acts as a protective layer that protects delicate parts from environmental influences. The finished alloy is applied to the metal by an electrochemical method.
Chrome plating of parts is used to achieve a decorative function. The chrome coating has a beautiful blue shade and does not lose its appearance even when heated to 500 ° C. Well-polished chrome coatings have the ability to reflect beautifully. Chromium plating is very widespread in all industries.
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