Why don't nails rust on Mars?

Report | 2012-01-1719: 46 Questioner: Aibo 19970 165438 | Number of views: 5006 | This question. & gt I'll help him solve it.

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Anonymous submission, satisfied answer report | 2012-01-2513: 39 There is this experiment in junior high school:

Put the nails into three test tubes, one of which is dry air (sealed), one of which is filled with half of water, but leave some nails in the air, the third tube is filled with water and covered with nails, and then sealed with a layer of oil. After a few days, you will find that only the nails in the second test tube are rusty. This experiment proves that rust must meet the requirements of air and water at the same time, which means that nails rust most easily in humid air.

Note: The main component that works in the air is oxygen.

The main component of rust is iron oxide (reddish brown)

Rust is a complex chemical reaction, and exothermic reaction is a slow oxidation phenomenon.

The first question seems to be that the conditions you gave are not enough ... If the nail is immersed in water, it will rust slowly, but at least faster than air, because there is only 0.03% water vapor in normal air, and the solubility of oxygen in water is 0.03 1 (less than one percent), so, ...

There is no air in a vacuum, so it won't rust.

Take appropriate measures according to the rust situation of iron, such as painting iron products, tin plating or zinc plating (they will form a dense oxide film to isolate iron from contact with oxygen and water vapor), or adding nickel-chromium to make stainless steel to prevent iron products from rusting.

The main component of the Martian atmosphere (about 95%) is carbon dioxide, and there are about 3% nitrogen and 1 ~ 2% argon, which add up to about 0. 1% carbon monoxide and oxygen, as well as a very small amount of ozone and hydrogen, and the amount of water vapor is also very small.

This means that there is not enough water and oxygen on Mars, so on Mars, nails will slowly oxidize, that is, slowly rust.

However, if it is not strictly said (at least in junior high school) that there is no water on Mars (because there is too little water, human beings can immigrate to Mars and electrolyze water to obtain oxygen), then it is similar that nails do not rust on Mars.