Why the use of aluminum is not as widespread as iron 5

First of all, the ** factor cannot be ignored, iron is indeed much cheaper;

second, the hardness of iron is large, and when it is further made into steel, the alloy is more obvious;

Third, electrolytic aluminum consumes too much electricity, and the iron smelting technology is relatively mature and consumes less energy;

Fourth, although the crustal element content of aluminum is greater than that of iron, this does not mean that there is more aluminum ore that can be mined than iron, and there are also factors of poor ore and rich ore;

Fifth, aluminum is easier to wear than iron, and is not suitable for industrial use;

Sixth, to correct it, although the chemical properties of aluminum are more active than iron, under normal conditions, aluminum will form a dense and strong oxide film to protect its stability, so this is not the main reason;

Seventh, for historical reasons, after hundreds of years of use and research, iron has penetrated into all walks of life, and the technology is quite mature.

Aluminum is more reactive, and it is more difficult to reduce aluminum from aluminum ore than iron, resulting in ** more expensive; Aluminum is more reactive than iron, and aluminum products are more susceptible to corrosion than iron products.

AL is chemically more reactive.

It is susceptible to corrosion.

Whereas, Fe is comparatively harder and less active.

There are many more in the earth's crust. So.

The cost of Al is higher than that of iron, and its stability is not as good as that of iron, and it is easy to be oxidized.

I guess it's because the physical properties of aluminum are not as strong as iron!

Aluminum, male, alloy or iron, which is more durable, iron and aluminum, is stronger than iron. 1. The hardness of iron is large. You can also scrape aluminum with iron.

Give it a try. 2. Hardness of iron; HRC5--10 degrees. Note; This number quality (it was measured by the degree testing machine just now, and the material is a 10mm iron plate.

It is too soft, and the measured quantity and quality cannot be converted against the table. The measurement method is to use a diamond probe and 15kg weight. The iron plate rebounded to 65 load15n.

The aluminum block springs back to 5 load15n. 65 load15n comparison table to know buried conversion = HRC8 pure iron is a ferroalloy with less carbon content, also known as wrought iron (the carbon content is called steel, and the carbon content is called pig iron).

Is the engine better in cast iron or all-aluminum.

Some people will say that "if the manufacturer uses a cast iron engine, then it is to cut corners, so the all-aluminum engine will be better" Then the question is, which is better, cast iron engine or all-aluminum engine? Or do they each have their own advantages?

In today's engines, there are two types of gasoline engine blocks: cast iron and cast aluminum, while diesel engines account for a large part of the cast iron blocks.

From the point of view of fuel saving, the cast aluminum cylinder body is lighter, which will reduce fuel consumption to a certain extent. In addition to the differences in weight, there are also many, many different processes for cast iron and cast aluminium throughout the production process. The cast iron cylinder block production line is relatively large, and the pollution to the environment is also very large, and the processing technology will be more complicated, while the production characteristics of cast aluminum cylinder block are just the opposite.

In terms of physical properties, the heat load capacity of the cast iron block will be stronger, so it will have more potential in the power improvement of the engine, so most of the diesel engines use cast iron blocks.

Disadvantages of cast aluminum engines: first of all, the volume, because the density of aluminum is less than that of iron, so the structural strength per unit volume is definitely less than that of iron. So the volume of a cast aluminum engine will generally be larger than that of cast iron (ps:

the same power). Then there is corrosion resistance, aluminum can easily react with the water produced by gasoline combustion in a high-temperature environment, which will continuously erode the aluminum surface and reduce the life of the engine. Looking at the friction coefficient in the engine, the physical characteristics determine that the friction coefficient of the cast iron cylinder block is better than that of the all-aluminum engine.

In a word: cast iron has good heat dissipation and high temperature resistance, but it is heavy. Cast aluminum is lightweight but has a number of drawbacks.

First, the magnetism is different.

Iron is very ferromagnetic, it is a magnetic material and can be attracted to magnets. Whereas, aluminum is not ferromagnetic and is not attracted to magnets.

Second, the density is different.

Aluminum is a light metal with a density of only about one-third that of iron. Take iron and aluminum of the same size, the lighter is aluminum, and the heavier is iron.

Third, the rust is different.

At room temperature, iron is not easy to react with non-metallic elements such as oxygen, sulfur and chlorine in dry air, and if there are impurities, it is easy to rust in humid air, and the rust is red iron oxide.

Aluminium is a reactive metal, and a dense oxide film (alumina) with a thickness of about 50 angstroms (1 angstrom = nanometer) is immediately formed on the surface of aluminum in dry air, so that aluminium does not oxidize further and is resistant to water, usually slightly silvery-gray.

Fourth, the color of high-temperature burning is different.

Under high temperature burning, the black particles are produced by iron, and the white particles are aluminum.

The density is different, and aluminum has a low density. The specific heat capacity is different, and the specific heat capacity of aluminum is larger. The colors are different.

The electrical conductivity is different, and the electrical conductivity of aluminum is stronger than that of iron. The thermal conductivity is different, and the thermal conductivity of aluminum is stronger than that of iron. The melting point is different, and aluminum has a lower melting point than iron.

The annual production is different, and the annual production of aluminum is smaller than that of iron. When stir-frying, I would rather use an iron pan than an aluminum pan.

The difference can be said from different angles: aluminum is a light metal among non-ferrous metals, while iron is traditionally classified as a ferrous metal. The position in the chemical periodic table is different, the chemical activity is different, the reduction of aluminum is stronger, the smelting process is completely different, aluminum is commonly used Bayer method and sintering method (I am majoring in aluminum, I am more clear about this), iron is generally used in blast furnace smelting, and so on.

Generally, aluminum is soft and hard, and iron can be adsorbed by magnetic substances, while aluminum cannot. Aluminum has a high reactivity and iron is relatively low———

The difference between aluminum and iron is in aspects such as chemical properties, physical properties, and uses.

Aluminum is a lightweight, soft, and good electrical and thermal conductivity metal, which is commonly used in the manufacture of aircraft, automobiles, building materials, etc. Iron is a heavy, hard, and magnetic metal, which is often used in the manufacture of steel, machinery and equipment, building structures, etc. Thus, the main difference between aluminum and iron is in terms of density, hardness, magnetism, etc.

Aluminum and iron are two very common metal elements, and they have a wide range of applications in production and life. Although they are both metals, they have different fields of application and uses due to their different chemical and physical properties. Aluminum is lightweight, soft, and corrosion-resistant, making it suitable for manufacturing lightweight structures and high-tech equipment, such as aircraft, automobiles, electronic equipment, etc.

Iron, on the other hand, has the characteristics of heavy weight, hardness, and high strength, and is suitable for manufacturing machinery and equipment, building structures, and vehicles. In addition, the renewable rates of aluminum and iron are also different, with aluminum being recyclable and iron being recycled comparatively low.

Application areas and production processes of aluminum and iron:

Aluminum and iron are two important metal elements, which are widely used in industrial production and daily life. The main application areas of aluminum include aerospace, automotive manufacturing, building materials, electronic devices, etc. The production process of aluminum includes electrolysis, smelting, powder metallurgy and other methods, among which electrolysis is the most popular industrial production method.

The main application areas of iron include steel manufacturing, machinery manufacturing, building structures, vehicles, etc. The production process of iron includes blast furnace smelting, direct reduction method, electric arc furnace method and other methods, among which blast furnace smelting method is the most important industrial production method at present. <>

The alumina produced by the oxidation of aluminum is a dense substance, which can prevent the aluminum inside from being further oxidized, while the rust produced by iron oxidation is a loose and porous structure, which is easier to absorb water, so aluminum products are more durable than iron products

Therefore, the answer to this question is: there is a dense alumina protective film on the surface of aluminum

Update 1:Can the electro-decorating of the anodic be electrolyzed to enhance the corrosion resistance of aluminum?

Both aluminum and iron are oxidized by oxygen in the air.

And aluminum is more chemically active.

Therefore, aluminum is susceptible to oxidation. However, the oxide of the aluminium will adhere tightly to the aluminium block.

Prevent further contact between aluminum and oxygen and water.

Prevents further oxidative corrosion.

Iron oxides, on the other hand, are very loose.

It can easily come off the iron.

Therefore, it is not possible to prevent the oxidative corrosion of lead and further lead in general.

If the aluminum block is exposed to air for oxidation.

The oxide film formed is about a micron (one micron is one millionth of a meter) and is quite susceptible to removal by other chemicals or abrasion.

And after anodic code excitation finger plating.

The oxide film thickness of aluminum can be thickened to 12-25 microns.

Thus increasing corrosion resistance.