Why is the cable tray galvanized or sprayed?

What are the main conditions for rusting iron products?
When the iron is put on for a long time, it will rust. Iron is prone to rust, in addition to its chemical nature, and also has a lot to do with external conditions. Moisture is one of the substances that make iron easy to rust. However, the presence of water does not rust the iron. Only when the oxygen in the air dissolves in the water, oxygen reacts with iron in a watery environment to produce something called iron oxide. This is rust. . Rust is a brown-red material. It is not as hard as iron. It is easy to fall off. After a piece of iron is completely rusted, the volume can swell up to 8 times. If the rust is not removed, the spongy rust is particularly easy to absorb moisture, and the iron will burn faster.
To remove the rust, you can use a variety of tools to shovel it off, or you can soak it in an acidic solution. After removing the rust, be sure to treat the surface of the iron, apply a layer of lead, and then paint; or plate other metals that are not easily rusted. A more thorough approach is to add some other metal to the iron to make a stainless alloy. The stainless steel we are familiar with is an alloy made by adding a little nickel and chromium to the steel.
  1. Iron rust is the result of a combination of moisture and oxygen.
  2. In the case of salt (and of course, to become an ionic form), the degree of rust will increase and the speed will increase.
First, there are impurities in the iron. Pure iron is not easy to rust. The irons that are now seen are all iron-carbon alloys, which are highly prone to galvanic corrosion.
The second is the existence of water. In a dry environment, iron is not prone to rust, and the presence of water makes electrochemical corrosion possible and accelerates corrosion.
Air pollution, such as carbon dioxide, sulfur dioxide, nitrogen dioxide, can produce acidic substances that corrode iron.