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Blueing

The blasting of steel is a chemical process used to produce a thin protective film of iron oxides Fe3O4 on the surface of a steel component. The name was received because of the characteristic color of the detail after processing (bluish-black, raven wing), also called "blackening" or "blinding" in the general case, regardless of color - "oxidation". The resulting film passivates the surface and protects the part from atmospheric corrosion and the effects of other corrosive media.

Before the blasting of the steel, the part is pre-prepared, rust-cleaned mechanically, polished, degreased and etched in acid solution. Degrease can be a solvent or alcohol. Etching is needed to remove all excess oxides from the surface, leaving bare metal.

The simplest way - the blasting of steel is oil. There are different methods, but the meaning is simple: a thin layer of oil is applied to the part, after which it needs to be heated to 300-350 ° C. Oil, burning, leaves an oxide film on the surface. From the first time, a uniform coating is not obtained, so the process is repeated until the desired result is achieved. It is important to achieve uniform heating, otherwise the film will become stained, and do not overheat the part, as it can be deformed or released. Many make a mistake and lower the heated part in the oil, this is wrong. It is necessary exactly the opposite: first to smear, then to warm. Oil is used by anyone, from sunflower to transmission or machine. This blasting of steel has a low coating strength. It is suitable only for decorative and protective purposes.

Burning of steel using iron sulfate, iron chloride and nitric acid

For this, 15 g of iron, 30 g of vitriol and 10 g of acid must be dissolved per liter of water. On the product dropped into the solution, a rusty coating will form, it must be periodically removed with a brush and continue dipping until the required color of the oxide film is obtained. Now practically in any city there is a store selling chemical reagents, so it's relatively easy to get them.

Burning of steel with the use of hrompik (dichromate potassium). For this, 200 grams of chrome is diluted per liter of water and the part is immersed in the solution for 20-30 minutes. After removal from the solution it must be dried at high temperature (in the oven or over the coals). The process should be repeated until a uniform blue-black color is obtained. After that, the part is wiped with an oiled rag. Hrompik - a reagent is very common, it is used in the leather industry.

To blaze weapons trunks, mix with heating 1 part by weight of antimony trichloride with 3 parts of olive oil. Then the mixture is applied to the part and left for a day. The process is repeated 10-12 times, after which the barrel is washed, dried and polished. The color turns greenish brown.

As can be seen from the above, the bluing of steel at home is a very feasible and uncomplicated process. It can be used for all steel products in cases where other methods of corrosion protection, for example, painting, are not applicable.

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