1.
( Irwin Maulana_corrosion in the muffler )
This is my revision :
1. Condensate Pitting Corrosion
I prefer to explain about this kind of corrosion that may occur in the
muffler because of it has a big damage to the muffler, like decrease the life
time, cause a noise problem and it can occur easily when the muffler is
used. A common problem in the automobile industry is pitting corrosion
in the muffler.
The typical muffler operating temperature is 700o to 800oF., with
pressure slightly above atmospheric. When the engine is shut off exhaust
gases remain trapped in the exhaust system and condensation occurs as the
muffler temperatur fails to ambiens. The condensate collects in the lower
portions of the muffler and enhances the rate of corrosion in those areas.
As the steam condences, the mist also tends to scrub the exponents such as
carbonic acid, nitrous and nitric acid, sulfurous and sulfuric acid. These
three acids, in conjuntion with the condensate, tend to accelerate the
oxidation of the metal. Therefore, within the muffler there are ordinarily
localized and harsh corrosive environments that may otherwise shorten the
useful life of the muffler.
2. Arthistic value of corrosion in the muffler :

2.
3. Pitting corrosion in the muffler :