Why is iron oxidized and what does iron oxidize into?

The chemical properties of iron are relatively reactive, and ordinary iron generally contains carbon impurities, which will form miniature galvanic cells and cause electrochemical corrosion. In addition, rust is fluffy and absorbs water, and once the iron rusts, it will accelerate the oxidation of the rest of the iron.

Galvanic corrosion, including oxygen absorption corrosion and hydrogen evolution corrosion.

The struggle for iron and steel gradually led the modern metallurgical industry to embark on a new path of development.

Iron and ordinary steel are often replaced by new, high-quality steels, which are made by adding a few thousandths of rare metals such as chromium, nickel, vanadium, tungsten, and niobium, which are tougher than ordinary steel.

In order to improve the properties of iron, in order to change the chemical reactions of iron, a major problem for the production of iron was also solved in huge blast furnaces and in iron casting workshops. Know that iron will flee from men; It is not gold, and gold can be kept in safes and banks, and its loss is minimal. But iron is not as honest as gold on the surface of the earth, in the environment around us; We all know that the surface of iron is easily covered with a layer of rust.

Just take a moist piece of iron and put it in the air, and it will soon rust; If the tin roof is not painted, the roof will rot into big holes in a year's work. We found ancient iron ** from the ground, like guns, arrows, and armor, all oxidized into reddish-brown hydroxides; The deterioration of these saws is also due to the uniform control of the chemical laws of nature; Iron oxidizes when it is affected by oxygen in the air. So there is a very important task in front of people - how to protect the iron from the action of oxygen.

Iron is oxidized in the air to form ferric oxide.

The chemical equation is 4Fe+3O2=2Fe2O3; Iron is oxidized in pure oxygen to form ferric tetroxide.

The chemical equation is 3Fe + 2O2 = ignition = Fe3O4. Iron is a representative of the iron group of elements and is the most commonly used metal, it is a type of transition metal and is the second most abundant metallic element in the earth's crust.

Chemical equation for iron oxidation.

1 element iron. Quality.

Iron is active, a strong reducing agent, and the valence is combined.

There are 0, +2, +3, +6, and the most common valence states are +2 and +3. At room temperature, iron cannot displace hydrogen from water, and the reaction rate increases above 500. Its compounds and their aqueous solutions tend to have a color tinge.

Iron reacts with oxygen in dry air very hard, but it is susceptible to galvanic corrosion in humid air, and corrodes more quickly in acid gases or in salt water or halogen vapor atmospheres. Iron can reduce ions such as gold, platinum, silver, mercury, copper, or tin from solution.

2. Oxidation reaction.

The action of a substance losing electrons is called an oxidation reaction; On the contrary, the action of gaining electrons is called reduction. Oxidation reaction in the narrow sense refers to the combination of substances and oxidation; A reduction reaction is the action by which a substance loses oxygen. The oxidation value increases during oxidation; The oxidation value decreases when reduced.

Oxidation, reduction both refer to reactants (molecules, ions, or atoms).

Oxidation is also known as oxidation reaction, and the action of introducing organic matter into oxygen or removing hydrogen during the reaction of organic matter is called oxidation; The action of introducing hydrogen or losing oxygen is called reduction. The substance reacts slowly with oxygen and slowly heats up.

Oxidation that does not emit light is called slow oxidation, such as metal rust, biological respiration, etc., and vigorous oxidation that glows and heats is called combustion.

Under natural conditions, iron becomes ferric oxide after oxidation In a high-temperature environment, iron becomes ferric oxide after oxidation!

Iron oxidizes to become rust, which is iron oxide, ferric oxide.

: 3Fe + 2O2 = = Fe3O4 (Condition: Heating or Ignition):

Fe Fe2+ (Fe reacts with acid to form ferrous ions), Fe2+ +2OH-==Fe(OH)2 ,4Fe(OH)2 +O2+2H2O==4Fe(OH)3 ,2Fe(OH)3==Fe2O3+3H2O (heating).

In addition, the main component of Fe rusting in humid air is Fe2O3·XH2O

Fe Fe2+ (Fe reacts with acid to form ferrous ions), Fe2+ +2OH-==Fe(OH)2 (isolated oxygen, can be protected with nitrogen), Fe(OH)2==FeO+H2O (heated, isolated oxygen, can be protected with nitrogen).

or Fe2O3 or Fe3O4 Fe: Oxides of iron can be reduced by reducing gases such as carbon (C) or H2 or CO. For example, 3CO+FE3O4==3FE+3CO2

2feO+3O2 2Fe2O3 (conditions are high temperature or ignition in oxygen).

Ferric oxide is mainly due to the adsorption of a thin film of water on the surface of steel in humid air, which contains a small amount of H+ and OH-, and also dissolves oxygen, resulting in the formation of a layer of electrolyte solution on the surface of steel, which forms countless tiny galvanic cells with iron and a small amount of carbon (because steel is impure). ”

The chemical equation for <> iron to iron oxide is: 4Fe+3O?=2fe?o?on ignition.

Elemental iron ignites in the air, and under different conditions, three products can be generated: iron oxide, ferric tetroxide, and ferrous oxide. The formation of iron oxide usually requires the formation of ferrous oxide, which then continues to burn to form iron oxide.

Iron oxide, chemical formula Fe?o?。Red or dark red amorphous powder.

Insoluble in water, soluble in hydrochloric acid and sulfuric acid, slightly soluble in nitric acid. Strong hiding and tinting strength, no oil permeability and no water permeability. It is stable in the atmosphere and sunlight, resistant to polluting gases, high temperature and alkali.

The crystalline particles of the dry process products of this product are coarse and hard, and they are suitable for magnetic materials and polishing and grinding materials. Wet products have fine and soft crystalline particles, which are suitable for the coating and ink industry.

Iron oxidizes and turns black. Because of the ironChemical propertiesIt is more lively, coupled with the fact that iron generally contains carbon impurities, and iron carbon will form miniature galvanic cells, resulting inGalvanic corrosion。In addition, the rust is fluffy and absorbs water, and once the iron rusts, it will accelerate the oxidation of the rest of the iron.

Iron is susceptible to rust not only because of its chemical activity, but also because of external conditions. Moisture is one of the substances that makes iron rust easily. However, only water does not rust iron, and iron oxide is formed only when oxygen in the air is dissolved in water, and the oxygen reacts with iron in the presence of water.

Stuff, that's rust.

Iron:

Iron is one of the most widely used metals by humans and one of the metals that have been used for the longest time. Iron is flexible and malleable.

of silvery-white metal. Iron is one of the most widely distributed metals on Earth, accounting for about the mass of the Earth's crust, ranking fourth in the sequence of elemental distributions, after oxygen, silicon and aluminum.

Iron-carbon alloy voltification town containing 2% carbon content.

Called pig iron. Pig iron is hard and brittle, but it is pressure and wear-resistant. According to the different forms of carbon in pig iron, it can be divided into white iron, gray iron and ductile iron.

The fracture of white iron is silvery-white, hard and brittle, and cannot be machined, so it is the raw material for steelmaking, so it is also called steelmaking pig iron. Carbon is distributed in the form of flake graphite, which is called gray iron, with silver-gray fractures, easy to cut, easy to cast, and resistant to coarse wear.

The above content reference: Encyclopedia - iron.

Iron oxide is non-toxic, but it is harmful to humans.

Iron oxide is an inorganic substance with the chemical formula Fe2O3 and is a red or dark red amorphous powder. The relative density is 5, and the melting point is 1565 (simultaneous decomposition). Insoluble in water, soluble in hydrochloric acid and sulfuric acid, slightly soluble in nitric acid.

As a pigment, iron oxide is widely used in high-grade automotive coatings, architectural coatings, anti-corrosion coatings, powder coatings, and is a good environmentally friendly coating, with an annual consumption of iron oxide pigments in the world exceeding 1 million tons, second only to titanium dioxide, and ranking second among inorganic pigments. The use of iron oxide as a pigment not only maintains the advantages of good heat resistance, weather resistance and ultraviolet absorption of general inorganic pigments, but also can be well dispersed in the oily carrier, and the paint or ink prepared with it has satisfactory transparency.

Yes, in the temperature range of 0 400, the minimum temperature required for the reaction is not reached at all, so the iron oxide is disadvantaged.

The quality has not changed

The answer is that the minimum temperature required for the reaction has not been reached

Spring infiltration begins at 400, and as the temperature increases, the oxygen in the iron oxide begins to gradually lose, and at 700, only iron remains, that is, the iron oxide is carbon monoxide at this time.

Reduced to elemental iron

Iron does not disappear after oxidation, and iron oxide is formed, that is, iron rusts. Moreover, ferric oxide is a reddish-brown powder, insoluble in water, organic acids and organic solvents. Soluble in inorganic acids. There are two types: -type (positive magnetic) and -type (diamagnetic).

Iron oxidation is actually a chemical reaction that is lacking and collapsing, and when the iron is placed in the dust for a long time, it will oxidize and rust. Iron is susceptible to rust, not only because of its chemical activity, but also because of external conditions. And moisture is one of the substances that makes iron rust easily.

However, only water does not rust iron, and only when oxygen in the air is dissolved in the water, the oxygen reacts with iron in the presence of water to form rust.

Because 3-valent iron has strong oxidizing properties, it can oxidize iron elements to 2-valent iron at high temperatures. In addition, iron oxide will decompose at high temperatures, and it will decompose into ferrous oxide and oxygen.

4fe+3o2===2fe2o3

Fe2O3+Fe==High Temperature==3FeO

2Fe2O3==High Temperature==4FeO+O2

There is another reaction, which is carried out under the condition of ignition, 3Fe + 2O2 = = Ignition = = Fe3O4

fe3o4 can also be written as feo*fe2o3.

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