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It is a ferroferric compound with the chemical formula Fe3O4. This is a black magnetic crystal. Iron Oxide .

Fe3O4 Properties

The Fe3O4 black powder is a mixed iron valence oxide. It has a melting-point of 1597degC. It is insoluble with water but soluble with acid solutions. Magnetite is the natural form of Fe3O4 at room temperatures. It is submagnetically strong and has a high conductivity.
The combustion of iron wires in oxygen produces ferroferric dioxide. By comparing the Gibbs energy produced by the standard mole (iron oxide) it has been concluded that Fe3O4 produces the highest thermodynamic stability.

Fe3O4 exhibits anti-corrosion properties. In the case of bluing steel parts, also known as baking blue and blue-burning, an alkaline-oxidizing solution is used to produce a blue-black Fe3O4 coating on the steel surface. Used to improve corrosion resistance, aesthetics and gloss.

Application of Fe3O4 Powder

Magnetic iron oxide (MIO) is used widely in many industries.
Ferroferric oxide, a common magnetic material, is ferroferric dioxide.
As a raw material, audio tapes and other telecommunications devices are manufactured using a special ferroferric compound.
Magnetite, or Fe3O4, is the natural raw material used in iron smelting.
Primer and topcoat are made from Fe3O4 Powder.
Ferric oxide is a raw material used to produce iron catalysts (a type of catalyst).
Fe3O4 can be used to abrasive. It has been widely applied in automobile braking systems, such as brake shoes and brake pads.
Ferroferric Oxide has been recognized as a domestic welding material. Production of welding rods and cables is still very new, but the market prospects are vast.

The high specific gravity of Fe3O4 and its strong magnetism make it a great choice for wastewater treatment.
Ferroferric Oxide can be used both as a paint and polishing agent.
Certain chemical reactions can be used, like the use of sodium-nitrite etc., to form an oxide layer of ferroferric, which is then applied to the steel surface to either prevent or delay corrosion. Blackened, the material is known as “baked-blue”.
Fe3O4 is a powder that can be used to create special electrodes.

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