Who s really willing to make a non rusty screw?

The ideal is ambitious, the society is cruel, the fact that you are small is helpless, who would want to be just a little person, take a little money and live a life in obscurity. No, at least not at the beginning of employment, or when you just graduated from school.

Society is like a machine that runs day and night, if you are a screw in this machine, you can't do it, right?

I remember a word of encouragement with a screw.

Figurative. Words.

The original words were said by Lei Feng, and two sentences are about screws (nails).

1. I would like to be a screw forever. Screws should be maintained and cleaned frequently so that they do not rust. The same is true of people's minds, which must be checked frequently so that nothing goes wrong.

2. Stick to your post. Some people say they are busy with work and don't have time to study. I think it's not a question of being busy at work, but whether you're willing to study or not, and whether you're squeezing time.

There is time to learn, the question is whether we are good at squeezing, and whether we are willing to drill. A good plank, there is not a single eye on it, but why can a nail be driven into it? This is what is squeezed in by pressure, and drilled into it.

From this point of view, nails have two benefits: one is squeezing, the other is drilling, we should also advocate this 'nail' spirit in learning, good at squeezing and drilling.

are all from Lei Feng's diary.

General iron contains carbon and other impurities, and rust is actually a layer of water film adsorbed on the surface of iron, and carbon dioxide is dissolved in the water film, which is acidic and will corrode iron.

The principle of rusting iron nails:

Generally speaking, the humidity in the rusty space of the iron nail is often relatively large, and the water vapor will form a layer of water film on the surface of the iron nail, when the air contains more acidic gases (such as hydrogen sulfide, sulfur dioxide, etc.), the acid solution formed after they are dissolved in water is easily oxidized by the air to sulfuric acid. ), which will be dissolved in the water film to form an acid solution, and the replacement reaction with iron will release hydrogen.

In this case, the nails will generally not rust, but they will continue to wear the nails; When the air does not contain more acidic gas, the water film is often neutral or weakly acidic, at this time, the carbon and iron in the iron nail and this point of electrolyte solution form a galvanic cell, the iron is oxidized into ferrous ions, combined with hydroxide to form ferrous hydroxide, which is quickly oxidized to iron hydroxide by the air, and the iron hydroxide gradually loses water and becomes rust.

Ways to remove rust:

Rust can be shoveled off with various tools, or it can be dissolved by soaking it in an acidic solution. After removing the rust, the surface of the iron must be treated, coated with a layer of lead, and then painted; Or plating it with other metals that don't rust easily. A more radical approach is to add some other metals to the iron to make a stainless alloy.

First of all, it is normal for screws to rust, and generally our common screws are made of carbon steel or stainless steel. Carbon steel is what we often call iron, which is easy to rust, although stainless steel screws have a certain anti-rust effect. But it's still going to rust.

In addition to the titanium screws in many materials, the screws of other materials will rust more or less, but the speed of rusting time is different. If the rust is a little worse, the screw has to be scrapped and replaced with a new screw, and rusty screws are taboo.

Stainless steel screws are in a humid environment for a long time, so that the protective film on the surface of stainless steel screws is damaged, and stainless steel screws will continue to corrode, corrode and rust. Stainless steel screws are in contact with organic juices such as noodle soup, melons and vegetables for a long time, and chemical reactions will occur into organic acids in the presence of water and oxygen, which will corrode the stainless steel screws. Stainless steel screws encounter condensation in polluted air, pollution refers to the presence of a large amount of sulfide or carbon oxide, water will constitute sulfuric acid, hydroxide, chemical corrosion of stainless steel screws.

Stainless steel screws refer to the shape of screws made of stainless steel screws and wire rods, and then the threads are rubbed. It is made of stainless steel. Stainless steel pitting corrosion mostly occurs in the environment containing iodine, chlorine, bromine and other aqueous solutions.

The reason for stainless steel pitting corrosion is that chloride ions are active anions, which are easy to be adsorbed, squeeze out oxygen atoms, and react with the cations in the passivation film to form soluble chlorides, destroy the passivation film, form small holes, and form pitting corrosion inducement stage, in which a blocked circuit is formed, and current corrosion occurs.