introduction to corrosion lecture#01. 2 definition corrosion may be defined as the destruction of a...
TRANSCRIPT
Introduction to Corrosion
Lecture#01
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Definition
Corrosion may be defined as the destruction of a metal or an alloy because of chemical or electrochemical reaction with its surrounding environment or medium
a metal or an alloy
environment or medium
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1Sheir, L.L., R.A. Jarman, and G.T. Burstein, eds. Corrosion. 3rd ed. Vol. 1. 2000, Butterworth-Heinemann: Oxford.
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Corrosion: Metallurgy in Reverse2
2Fontana, M.G., Corrosion Engineering. 3rd ed. 1986, New York: McGraw-Hill.
Some Corrosion Failure Examples3
3Corrosion Doctors Website. Homepage: http://www.corrosion-doctors.org
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Aloha Incident
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Aloha Incident (Contd..)
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Bhopal Accident
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Carlsbad Pipeline Explosion
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Flow Accelerated Corrosion
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Nuclear Reactor with a Hole in the Head
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Losses due to Corrosion4
4Uhlig, H.H. and R.W. Revie, Corrosion and Corrosion Control. 3rd ed. 1985, New York: John Wiley & Sons.
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Cost of Corrosion
Which cost more? Corrosion Fire Flooding Earthquake
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Cost of Corrosion(2004) in billion US$5Country Direct Cost Indirect Cost
USA 303.76 200 (approximately)
Japan 59.02
Former USSR 55.01
Germany 49.26
UK 8.51
Australia 7.32
Belgium 6.75
India 3.78
Poland 3.53
Canada 3.38
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Global 510.14 940 (approximately)
5Bhaskaran, R., N. Palaniswamy, and N.S. Rengaswamy, Global Cost of Corrosion—A Historical Review, in Corrosion: Materials, Vol 13B, ASM Handbook. 2005, ASM International.
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Example of Overdesign3
An 8" in. dia oil pipeline 225 miles long with a in. wall thickness was installed with no corrosion protection system
With appropriate protection namely cathodic protection, it would have a thin wall thickness which would save 3,700 tons of steel (worth more than one
million dollar) increase internal capacity of the pipeline by about
5%.
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So……Why Study Corrosion?
Materials are precious resources Engineering design is incomplete without knowledge
of corrosion Applying knowledge of corrosion protection can
minimize disasters Corrosion – contaminate products such as
pharmaceutical, food and dairy products or luxury items like soap
Corrosion products – threat to the environment Artificial implants for the human body!!!
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Distribution of disciplines in which active corrosion engineers have graduated
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So .. What would be expected from You (a Corrosion Engineer)? Ensuring maximum life of new equipment Preservation of existing equipment Protecting or improving the quality of a product in order to
maintain or improve a competitive position. Avoiding costly interruptions of production. Reducing or eliminating losses of valuable products by spillage
or leaks. Refitting of equipment withdrawn from service because of
corrosion. Reducing hazards to life and property that might be associated
with corrosion: Explosions of pressure vessels or piping systems release of poisonous or explosive gases or vapors are a few examples.