Why does iron rust? Detailed answer

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Why does iron rust? Detailed answer

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Why does iron rust?

If you leave any iron object in a damp and damp place for several days, it will rust, as if it had been painted with reddish paint.

What is rust? Why does it form on iron and steel objects? Rust is iron oxide. It is formed as a result of the "combustion" of iron when combined with oxygen dissolved in water.

This means that in the absence of moisture and water in the air, there is no oxygen dissolved in water at all and rust does not form.

If a raindrop falls on a shiny iron surface, it remains transparent for a short period of time. Iron and oxygen in the water begin to interact and form an oxide, that is, rust, inside the drop. The water becomes reddish and the rust floats in the water as small particles. When the drop evaporates, rust remains, forming a reddish layer on the surface of the iron.

If rust has already appeared, it will grow in dry air. This is because the porous rust patch absorbs the moisture in the air - it attracts and holds it. This is why it is easier to prevent rust than to stop it once it has appeared. The problem of rust prevention is very important, since iron and steel products must be stored for a long time. Sometimes they are covered with a layer of paint or plastic. What would you do to keep warships from rusting when not in use? This problem is solved with the help of moisture absorbers. Such mechanisms replace moist air in compartments with dry air. Rust in such conditions can not appear!

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Over which three seas did the Tver merchant Afanasy Nikitin travel?

In 1466-1472, the Tver merchant Afanasy Nikitin made a trip to Persia and India, which he reflected in his work "Journey Beyond the Three Seas" - in this first book in medieval Europe, which gives a completely realistic and at the same time colorful description of India and the ways leading to it from Eastern Europe.

In 1466, Afanasy Nikitin set out on a trading mission from Tver down the Volga. Having reached Derbent and Baku along the Caspian Sea, he then sailed to Persia (modern Iran), where he lived for about a year. In the spring of 1469, he arrived in the city of Ormuz and reached India through the Arabian Sea, where he lived for about three years, traveling a lot. On the way back, he reached Trebizond (modern Trabzon) through Persia, crossed the Black Sea and in 1472 arrived in Kafa (modern Feodosia).

Thus, during his remarkable journey, Afanasy Nikitin crossed the Caspian, Arabian and Black Seas.

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