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There are a number of reasons.
It is not painted, or covered by a corrosion resistant material, as the height temperatures it is exposed to would tend to burn-off or other wise remove such coatings.
The exhaust gases passing thought it contain corrosive substances such as sulphur oxides (Sulphuric acid) Nitrogen Oxides (Nitric acid) to name a few. Even the use of corrosion resistant coating may not be enough to protect against these, given that chemical reactions are improved with heat (IE the hotter it is, the faster it goes), and exhausts are hot.
Also, one of the products of combustion is water, and water rusts iron/steal, even in the absence of acids.
Other metals could be used, but the additional costs of using stainless steel, or perhaps aluminum, are (one must assume) currently not seen as beneficial by purchasers.
It should also be noted that over time the "sound absorbent" material within the exhaust, normally glass fibre, becomes impregnated with carbon. This means that an exhaust that wound last for ever would still need to be replaced eventually, as is would lose it's sound absorbing properties.
What else can I help you with?
Why does a car exhaust rust quicker than the car body?
One reason why car exhausts rust faster than the car body of the car is because they are often at a different temperature. The exhaust can be very hot and very cold so this creates a reaction rate which inturn makes the exhaust rust faster. hope that helps :)
Why car exhausts rust so quickly?
If the vehicle has a stainless steel exhaust system it will last the life of the car. If it does not and you drive in roads treated with salt it will not last as long. Surface rust does not mean the exhaust in need of repair. Surface rust is normal on a steel exhaust system.
Is rust on a car hurmful or not?
When the rust weakens important structural joints or opens areas where exhaust fumes can enter the cabin area, yes it can be harmful.
Why will an exhaust pipe in a car rust faster if the car is used a lot?
The reason being is that the exhaust not only releases gases and vapors but humidity as well. That is the reason why at times u notice it sweating.
Why is it harmful when a car goes rusty?
Serious rust can compromise the strength of structural joints. Serious rust can also allow unwanted exhaust fumes enter the cabin area.
Where is a catalytic converter used in a car?
It is part of the exhaust system.
What part of a car releases waste fumes?
it is called the Exhaust pipe
What parts of a car can rust?
It rusts because of the oxygen present in atmosphere. Rust is iron oxide - where the iron in the steel has combined with oxygen. Preventing oxygen reaching the metal is the primary way to avoid rust, and this is done primarily with paints and other coatings.
What part of the car does the catalytic converter?
It is part of the emmission system and is mounted in the exhaust pipe near the engine.
Why is it dangerous to drive a rusty car?
Surface rust isn't dangerous, cancerous rust on the frame can be dangerous because the car could snap in half depending on the extent of the rust. The best solution usually is just to get a new car because the frame usually isn't worth fixing. In my state they consider it dangerous because if you get stuck in snow they fear exhaust entering the cabin and killing its occupants. Rust holes of any kind will fail your inspection.
Is a muffler part of the emissions in a car?
No. The muffler is a passive component in the exhaust emissions system.
Do car magnets cause rust?
Car magnets doesn't cause rust.
