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Introduction to Corrosion

Introduction to Corrosion . Lecture#01. 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. Environments in Corrosion 1.

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Introduction to Corrosion

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  1. Introduction to Corrosion Lecture#01

  2. 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

  3. Environments in Corrosion1 1Sheir, L.L., R.A. Jarman, and G.T. Burstein, eds. Corrosion. 3rd ed. Vol. 1. 2000, Butterworth-Heinemann: Oxford.

  4. Corrosion: Metallurgy in Reverse2 2Fontana, M.G., Corrosion Engineering. 3rd ed. 1986, New York: McGraw-Hill.

  5. Some Corrosion Failure Examples3 3Corrosion Doctors Website. Homepage: http://www.corrosion-doctors.org

  6. Aloha Incident

  7. Aloha Incident (Contd..)

  8. Bhopal Accident

  9. Carlsbad Pipeline Explosion

  10. Flow Accelerated Corrosion

  11. Nuclear Reactor with a Hole in the Head

  12. Losses due to Corrosion4 4Uhlig, H.H. and R.W. Revie, Corrosion and Corrosion Control. 3rd ed. 1985, New York: John Wiley & Sons.

  13. Cost of Corrosion • Which cost more? • Corrosion • Fire • Flooding • Earthquake

  14. Cost of Corrosion(2004) in billion US$5 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.

  15. 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%.

  16. 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!!!

  17. Distribution of disciplines in which active corrosion engineers have graduated

  18. 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.

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