Why is an exhaust system coated with aluminium when new?
Answers:
The term is "aluminized". It is done to cut down on rust potential.
Rust inhibitor
It is not aluminium it is coated with zinc to help stop it from rusting
Are you sure it's aluminum. It might be zinc.
it sheds heat quicker and is rust proofing.
Dear Sabrine H you have posted alot of car questions on here tonight, are you at college learning motor mechanics, any way i think you will find it is not aluminium but zinc/galvanised metal to try and stop rust.
To Stop it rusting too quickly
As others have already pointed out the coating is a zinc oxide paint which is sprayed on during the manufacture of the exhaust.This is primarily to prevent rust during transportation and storage,after the exhaust is fitted if it is a section close to the engine the paint will burn off within minutes of the engine being started,but will last a lot longer on cooler parts of the system.
It acts as a sacrificial anode. It is eaten away rather than the steel.
It is the cooler bits of an exhaust system that rust or are eaten away by condensed exhaust gases. The bits that get really hot seem to last and last. Holes come in silencers first.
They used to fit blocks of zinc to ships to give the same effect.
RoyS
so it will not rust in stock
To look good
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