What iron doesn t rust and why does iron rust? How to make it rust free?

Stainless steel is not easy to rust and has a lot to do with the composition of stainless steel. In addition to iron, stainless steel also includes chromium, nickel, aluminum, silicon, etc. The chromium content of general stainless steel is generally not less than 12, and the high even reaches 18.

After adding chromium and other elements to the steel, the properties of the steel can be changed, such as the molecular structure of the steel is more uniform, and it is easier to generate a dense oxide protective film on the surface of the steel, so as to greatly improve the corrosion resistance of stainless steel. Therefore, stainless steel can resist the corrosion of fire, water, acid, alkali and various solutions to it, and does not rust. Scientists have found that the more uniform the internal structure of steel, the more closely related the various components, the more difficult it is for corrosion to invade, and the surface is attached with a layer of oxide protective film, just like putting armor on steel, it is naturally not easy to rust.

Iron rust is oxidized.

- Elected by questioner2006-03-11 00:31:25.

Pure iron is very susceptible to oxidation in moist air, producing iron oxides, which we commonly refer to as rust. There are two ways to prevent iron from rusting, the first is to isolate oxygen and/or water, and the second is to improve the corrosion resistance of iron.

In the first case, the iron can be placed in a dry place to isolate oxygen, or in an organic solvent that does not contain water, or an organic protective film such as paint can be applied to the iron.

In the second case, the surface morphology of iron can be changed to make it more corrosion-resistant, such as high-temperature quenching to form a corrosion-resistant dense oxide film on the surface. Plating with electroplating, electroless plating or physical methods on other corrosion-resistant metals. A small amount of other elements such as carbon, chromium, nickel, etc. are mixed in pure iron to make highly corrosion-resistant alloys, such as stainless steel.

Galvanized iron does not rust due to galvanic corrosion.

Do you know why iron rusts?

Computer industry

Junior high school students now also like to play with computers, so if you study this industry, junior high school students will like it very much, and they will be very interested, junior high school students are young, and they will learn things relatively quickly, learning the computer industry, whether you have a high degree or not, you can find your place in the job.

And the development prospects of the computer industry are very good, very promising, we can also learn what the future development of the computer industry is, all aspects of basic life need to use intelligence, intelligent things must be inseparable from computers.

Dietitian

Dietitians actually do not have very high requirements for academic qualifications, if it is a junior high school student learning this technology, it may take a little longer to learn, but the advantage of junior high school students is that they are young, so they still have time to learn, and when they become adults, they can go to work, and when you work for a few years, some students may graduate, their experience is definitely not as rich as yours, and some work experience is also very important. Nowadays, people in society attach so much importance to health, and I believe that this technology must have a promising future.

Car repairs

Car repair is a general term for car maintenance and repair. It is to investigate the faulty car through technical means, find out the cause of the failure, and take certain measures to eliminate the fault and restore it to a certain performance and safety standard.

If you are a boy, you can just go to learn this technology, in life, many students who graduated from junior high school have gone to learn this technology, and after a few years, they can also stand on their own, and auto repair earns a lot of money, maybe when your technology is not mature, the salary will not be high, but you will definitely be able to spend.

Cook

Nowadays, people pay more attention to the food industry, people's quality of life is gradually improving, and the requirements for food are getting higher and higher. Cooking is not just cooking, for some high-end catering industries, there is still a shortage of high-level culinary talents. For example:

Pastry chef, Western chef. At the same time, with the introduction of other countries' cuisines, some other countries' cuisines are also welcomed and sought after, and it is really a good choice for junior high school students who want to learn technical cooking before graduation.

The conditions required for iron to rust are as follows:

1. The active chemical properties of iron itself.

2. Oxygen contained in the air under external conditions.

3. Moisture is one of the substances that makes iron easy to rust.

Rust is a general term for iron oxides, usually red, which is produced by the redox reaction of vernal difference in the presence of iron and oxygen. Different forms of rust are formed under different circumstances. Rust is mainly composed of ferric oxide hydrate and iron hydroxide.

Other metals can also oxidize, but are not usually called "rust".

After enough time, with sufficient oxygen and water, the iron will completely oxidize to rust. The oxidation of aluminum is very slow because oxygen forms a dense film of aluminium aluminium on the surface of the aluminum, a reaction called passivation.