Why is galvanizing usually used to prevent rust instead of aluminum

After galvanizing, zinc forms a dense oxide film (ZNO) on the surface, which can prevent substances such as oxygen and water in the air from coming into direct contact with iron!

But this is not the case with aluminum, the rust it produces sticks to its own surface, preventing oxygen from drilling into the interior of aluminum, so that the aluminum inside will not regenerate rust, and this layer of rust has become the characteristic protective film of aluminum products, we call it alumina. Alumina has the property that if it is wiped away, a new layer of alumina will soon be formed, which will continue to play a protective role.

However, it is the oxide layer of aluminum that is not strong enough and is easy to fall off, so.

Zinc is more reactive than aluminum! Junior high school children know that aluminum is more lively than zinc, which involves industrial technology and cost, and so on.

Zinc forms galvanic cells on solid surfaces, protecting iron from oxidation, which aluminum does not have.

Aluminum is too reactive and easy to be oxidized, and the chemical properties of Zn are relatively stable

The main reason should be that zinc is better plated than aluminum.

1. Stainless steel is more prone to rust, and aluminum is more active than socks, and it is easy to be oxidized and produce a passivation layer on the surface of the surface. That's why it doesn't rust. And stainless steel does not rust because of the doping of chromium in stainless steel, so that an oxide film is also formed on its surface, when the addition of chromium reaches 10 5, the atmospheric corrosion resistance of steel is significantly increased, but when the chromium content is higher, although it can still improve the corrosion resistance, it is not obvious.

2. Stainless steel is divided into three categories: austenitic stainless steel.

Ferritic stainless steel and martensitic stainless steel.

However, stainless steel is not completely resistant to rust, and aluminum alloy is less prone to rust than stainless steel.

1. The difference between galvanized and stainless steel.

a) The concept is different.

1. Galvanizing refers to the coating of a layer of metal zinc on the surface of the steel plate in order to prevent the surface of the steel plate from being corroded and prolong its service life. This galvanized sheet of thin steel is called galvanized sheet.

2. Stainless steel refers to the steel that is resistant to weak corrosive media such as air, steam, water and chemical corrosive media such as acid, alkali and salt, also known as stainless acid-resistant steel.

2) The processing technology is different.

1. Galvanizing is mainly to coat a layer of dense zinc on the surface of steel to prevent it from being oxidized.

2. Stainless steel is the addition of other metal elements inside the steel, which is the internal structural change so that the product does not rust. Such as chromium stainless steel, chromium-nickel stainless steel and chromium danjing manganese nitrogen stainless steel, etc.

3) Different uses.

1. Galvanized sheet strip products are mainly used in construction, light industry, automobile, agriculture, animal husbandry and fishery and commercial industries. Such as for building roof panels, roof grilles, etc.; kitchen utensils, etc.; Storage, transportation, packaging utensils, etc.

2. Stainless steel is mainly used in the field of construction, and is one of the strongest materials in the metal materials used in construction, and is also used in the fields of Luchun food processing, catering, brewing and chemical industry with high requirements for sanitary conditions.

Second, the use of galvanized and stainless steel.

1. The application of electro-galvanizing has been spread throughout machinery manufacturing, making galvanized hook nets, electronics, precision instruments, chemical industry, transportation, aerospace, etc.

2. Stainless steel is mainly used in curtain walls, side walls, roofs, elevator decorative panels and other construction purposes in the field of construction. Chromium-containing stainless steels also combine mechanical strength and high elongation for manufacturing components. Also applied as:

Manufacture of Class I and II tableware, kitchenware, water heaters, water dispensers, etc.

Yes, the more inactive the metal, the easier it is to spot, because the metal is more stable, but there are some exceptions.

So, first copper, then iron, then aluminum.

(1) Copper first, then iron, and finally aluminum.

2) Copper first, then iron, and finally aluminum.

Hee Hee: The answer to both questions is the same.

Iron: 2,500 years ago, Aluminum: 200 years ago, Copper 6,000 years ago,

First copper, then iron, and finally aluminum.

Bronze Age. Iron Age.

I don't remember that Napoleon used aluminum products when he was emperor, because they were found to be scarce.

Because I am a galvanized sheet manufacturer, I will talk about the characteristics of galvanized products. Galvanizing is divided into hot-dip galvanizing and electro-galvanizing, of which hot-dip galvanizing generally has a thicker zinc layer, and the anti-corrosion effect is better than that of electro-galvanizing. Its physical properties depend mainly on the substrate material.

Ordinary grade, stamping grade, deep drawing grade).

Stainless steel plates--- contain nickel and chromium elements, and have the ability to resist corrosion. There are more common and accepted definitions, which you can search for on your own. There are too many types, and the gap is huge.

Aluminum alloy plate is a plate made by adding other elements to aluminum. After "alloying", the mechanical, chemical, and processing properties of aluminum will be improved.

Galvanized steel sheet - galvanized sheet is obtained by plating a zinc layer on a cold-rolled steel sheet or a hot-rolled steel sheet.

Electroplating galvanized is called electrozinc plate, with a thin zinc layer and poor corrosion resistance, and is used for indoor facilities; The hot-dip galvanized sheet is called hot-dip galvanized sheet, which has a thick coating and strong corrosion resistance, and can be used in outdoor facilities.

Hello landlord!

First of all, the mechanism is different, what we call galvanization is mainly to coat a layer of dense zinc on the surface of steel to prevent it from being oxidized; Stainless steel, on the other hand, is the addition of other metal elements inside the steel, but the internal structural changes make the product not rust (oxidize).

This use can be said according to their principle of "stainless steel".

The galvanized steel doors we generally use are a category, guardrails, etc.; And use stainless steel knives.

Galvanizing: A protective film obtained by treatment on the surface, just like a person wearing a piece of clothing; The stainless steel is added with nickel inside, so that it has an immune function to the external reaction and plays a role in protecting itself, just like a person who takes medicine to resist diseases.

Galvanized and economical, but no matter how good it is, it is also the surface.