1. “Corrosion in the Muffler”
1
PRESENTED BY:
IRWIN MAULANA
3334090293
METALLURGICAL DEPARTMENT
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2. 2
Outline 1. Introduction
2. Kinds of corrosion
3. Prevention
Corrosion in the Muffler
1. Irwin Maulana 4. Advantages and
2. 3334090293 Disadvantage
3. Metallurgical
Engineering 5. Refferences
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3. Introduction
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 An automotive exhaust
system consists of the
following seven
Muffler components from the
???? engine side:
a. an exhaust manifold,
b. a front pipe,
c. a flexible pipe,
Muffler - A device with baffled d. a catalytic converter,
passages through which exhaust
gases are channeled in order to e. a center pipe,
muffle engine sound
f. a main muffler, and
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g. a tail end pipe.

4. THE MAIN MUFFLER
ABSORBS AND REDUCES
THE NOISE OF THE
EXHAUST GAS, AND IS
COMPOSED OF AN OUTER
SHELL,
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Muffler is a part of
exhaust system that have
many functions, and
made from metal.
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5. The principal properties required
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1. high-temperatures strength,
2. thermal fatigue properties,
3. oxidation resistance and salt corrosion resistance at
high temperatures, and
4. the same required for the components away from the
engine (cold end) is corrosion resistance to salt
damage and exhaust gas condensate.
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6. Ferritic Stainless Steels ( steels in the 400
series contains 10.5% to 20% chromium )
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 Good for corrosion resistance and resistance to
scaling at elevated temperatures
 nonhardenable by heat treating and are always
magnetic.
 is used in applications where resistance to corrosion
is important, such as automotive emission control
exhaust systems.
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7. 8 7 12/10/2011

8. Kinds of corrosion
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 Condensate Pitting Corrosion
 Exterior Salt Pitting
 Crevice corrosion
 Galvanic corrosion
 Oxidation
 Hot Salt Attack
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9. Condensate Pitting Corrosion
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The main muffler is heated by the exhaust gas to about 400°C, at the highest,
during a long-distance run and the condensation of water does not take place
but in the case of a short-distance run, the temperature does not go up and
condensation occurs inside it.
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10. 1. By the presence of the condensate, a very corrosive
humid environment is formed inside a muffler.
2. On the other hand, the outer surface of a muffler is
exposed to a salt corrosion environment of the
deicing salt. Chloride-containing de-icing salts on
the roads in colder countries greatly increases the
rate of corrosion on the exterior surfaces.
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11. Prevention
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 Material selection
 Coating (Vitreous Enamel)
 Using crystalline of zeolite and activated alumina
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12. Advantages and Disadvantage
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 Advantages  Disadvantages
1) Give an arthistic value 1) Decrease the life time
2) Of all automobile
exhaust failures, about
80% are caused by
corrosion
3) Cause a noise problem
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13. Refferences
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 ASM Handbook_ Volume 13C. Corrosion: Environments
and Industries
 D.C. Oliver and M. Sephton , External corrosion
resistance of steel and ferritic stainless steel exhaust
systems
 Fethke, et.al. Methods for Retarding the Corrosion in
Mufflers
 J.H. Potgieter, M. Sephton and Z.W. Nkosi, Corrosion of
hot end automotive exhaust components
 Yoshiharu INOUE Masao KIKUCHI. Present and Future
Trends of Stainless Steel for Automotive Exhaust System.
 www.aksteel.com
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14. 14
...THANK YOU...
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