By Lzh | 09 February 2023 | 0 Comments
Why does ferric oxide have anti-corrosion effect?
What is ferric oxide?
Iron tetroxide is an inorganic substance with the chemical formula of Fe3O4. It is a magnetic black crystal, so it is also called magnetic iron oxide. It cannot be regarded as "ferrous metaferrite" [Fe (FeO2) 2], nor can it be regarded as a mixture of ferrous oxide (FeO) and iron oxide (Fe2O3), but it can be approximately regarded as a compound of ferrous oxide and iron oxide (FeO · Fe2O3). This substance is insoluble in water, alkali solution and ethanol, Organic solvents such as ether. Natural ferric oxide is insoluble in acid solution. It is easy to oxidize into ferric oxide (Fe2O3) in the air under wet conditions. It is usually used as pigment and polishing agent, and also can be used to manufacture audio tapes and telecommunications equipment.
Chemical properties of ferric oxide
The thickness of oxide film also varies according to environmental conditions during oxidation. At room temperature, the thickness of oxide film on relatively pure iron in dry air is not more than 20 angstrom (1 angstrom=0.1 nm), but the thickness of oxide film is significantly increased in wet air, and rust spots on the surface can be seen. At this time, the oxide deposition is layered, and the side close to the metal is a dense amorphous water layer; the side close to the air is a thick porous hydration layer. Iron reacts with water vapor to generate Fe3O4 and hydrogen. Fe3O4 has an anti-corrosion effect, such as the blueing of steel parts (also known as burning and baking) is to use the oxidation of an alkaline oxidizing solution to form a layer of blue-black or dark blue Fe3O4 film on the surface of steel parts to increase corrosion resistance, luster, and beauty.
Preparation of ferric oxide
1. Addition method: react iron filings with sulfuric acid to produce ferrous sulfate, then add caustic soda and iron oxide to conduct an addition reaction at 95~105 ℃ to produce the ferric oxide, which is filtered, dried, and crushed to produce iron oxide black.
2. Slow oxidation method of ferrous hydroxide: heat the aqueous solution containing ferrous hydroxide precipitation to above 70 ℃, and conduct slow oxidation to obtain about 0.2 from the edge length μ Fe3O4 powder composed of fairly uniform octahedral or cubic single crystal particles of m. It can also be oxidized by conveying air bubbles. It can also use oxidants like KNO3.
Price of ferric oxide
Ferric oxide particle size and purity will affect the product's price, and the purchase volume can also affect the cost of ferric oxide. A large amount of large amount will be lower. The price of ferric oxide can be found on our company's official website.
Ferric oxide supplier
Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) Luoyang City, Henan Province, China, is a reliable and high-quality global chemical material supplier and manufacturer. It has more than 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including ferric oxide, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective ferric oxide, you are welcome to contact us or inquire at any time.
Iron tetroxide is an inorganic substance with the chemical formula of Fe3O4. It is a magnetic black crystal, so it is also called magnetic iron oxide. It cannot be regarded as "ferrous metaferrite" [Fe (FeO2) 2], nor can it be regarded as a mixture of ferrous oxide (FeO) and iron oxide (Fe2O3), but it can be approximately regarded as a compound of ferrous oxide and iron oxide (FeO · Fe2O3). This substance is insoluble in water, alkali solution and ethanol, Organic solvents such as ether. Natural ferric oxide is insoluble in acid solution. It is easy to oxidize into ferric oxide (Fe2O3) in the air under wet conditions. It is usually used as pigment and polishing agent, and also can be used to manufacture audio tapes and telecommunications equipment.
The thickness of oxide film also varies according to environmental conditions during oxidation. At room temperature, the thickness of oxide film on relatively pure iron in dry air is not more than 20 angstrom (1 angstrom=0.1 nm), but the thickness of oxide film is significantly increased in wet air, and rust spots on the surface can be seen. At this time, the oxide deposition is layered, and the side close to the metal is a dense amorphous water layer; the side close to the air is a thick porous hydration layer. Iron reacts with water vapor to generate Fe3O4 and hydrogen. Fe3O4 has an anti-corrosion effect, such as the blueing of steel parts (also known as burning and baking) is to use the oxidation of an alkaline oxidizing solution to form a layer of blue-black or dark blue Fe3O4 film on the surface of steel parts to increase corrosion resistance, luster, and beauty.
Preparation of ferric oxide
1. Addition method: react iron filings with sulfuric acid to produce ferrous sulfate, then add caustic soda and iron oxide to conduct an addition reaction at 95~105 ℃ to produce the ferric oxide, which is filtered, dried, and crushed to produce iron oxide black.
2. Slow oxidation method of ferrous hydroxide: heat the aqueous solution containing ferrous hydroxide precipitation to above 70 ℃, and conduct slow oxidation to obtain about 0.2 from the edge length μ Fe3O4 powder composed of fairly uniform octahedral or cubic single crystal particles of m. It can also be oxidized by conveying air bubbles. It can also use oxidants like KNO3.
Price of ferric oxide
Ferric oxide particle size and purity will affect the product's price, and the purchase volume can also affect the cost of ferric oxide. A large amount of large amount will be lower. The price of ferric oxide can be found on our company's official website.
Ferric oxide supplier
Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) Luoyang City, Henan Province, China, is a reliable and high-quality global chemical material supplier and manufacturer. It has more than 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including ferric oxide, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective ferric oxide, you are welcome to contact us or inquire at any time.
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