Write a short note on corrosion and prevention
Answers
Answer:
You're wandering around and you notice an old car. What in the world happened? It's covered in an orange substance that makes it look really bad.
Well, what you're observing is called corrosion, which is the breaking down of a substance, typically a metal, due to reactions that have occurred between the substance and the environment. So, that orange material all over that car is corrosion due to rust, which is a common type of corrosion caused by iron or steel breaking down in the presence of water and air.
Rust makes the metal weaker and can cause problems. Plus, let's face it, it looks pretty terrible! While a rusty car doesn't seem like a huge deal, corrosion actually costs the United States upwards of $276 billion per year! Think of all of the money it takes to rebuild and repair corroded stuff in your world, whether that is a bridge, a building, or a train.
Explanation:
Process
What's happening when something corrodes? Let's focus on metals, since corrosion is most common with them. Naturally, metals are found attached to other elements in compounds. In order to get a pure metal from a compound, energy must be used to refine it.
When this pure, refined metal is placed in the environment, the energy is released - this is corrosion. In other words, the corroded version of the metal is more stable than the pure metal, so, when exposed to things like seawater or oxygen, the pure metal reverts back to its stable form.
Preventing Corrosion
So, how do you prevent corrosion? Let's check out some common ways people avoid corrosion in metals.
Answer:
Summary. Corrosion is a galvanic process that can be prevented using cathodic protection. The deterioration of metals through oxidation is a galvanic process called Corrosion. Protective coating consists of a second metal that is more difficult to oxidize than the metal being protected.