well just imagine that you are building a car, or a train or an airplane and the metal you use for something starts to rust, if that's near the engine or something that leads to the engine than it could put set the car a light.
Rust is a problem because it is Ugly
No, that is not a problem.
destruction of a metal
No
The Mistakes done by engineers during there work which leads to some kind of damage to society is called engineering problem.
Pitting is when there are small holes starting to appear in steel often caused by corrosion/rust
Corrosion and rust could be problems with iron bridges.
I don't think you are able to fix this rust problem, take you car to your local repair shop or car dealer. They should be able to take care of your problem and fix it for you. Hope I can help.
you can fix your car when it has a problem
To determine a reacting substance that use in manufacture of machines buildings ex iron get rust etc
Scale drawing.
Instead of covering the rust with paint, it is better to buy a rust remover. This will quickly polish your old faucet and make it look as good as new, while paint will only cover the problem temporarily.