ENME382 S2010 0201 ch16

ENME382 S2010 0201 ch16 - CHAPTER 16: CORROSION AND...

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ISSUES TO ADDRESS. .. How does corrosion occur ? Which metals are most likely to corrode? CHAPTER 16: CORROSION AND DEGRADATION OF MATERIALS Chapter 16 - ENME 382 Spring 2010 Section 0201 1 What environmental parameters affect corrosion rate? How do we prevent or control corrosion?
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Corrosion : -- the destructive electrochemical attack of a material. -- Ex: Al Capone's ship, Sapona, off the coast of Bimini. THE COST OF CORROSION Chapter 16 - ENME 382 Spring 2010 Section 0201 2 Cost: -- 4 to 5% of the Gross National Product (GNP)* -- in the U.S. this amounts to just over $400 billion/yr** * H.H. Uhlig and W.R. Revie, Corrosion and Corrosion Control: An Introduction to Corrosion Science and Engineering , 3rd ed., John Wiley and Sons, Inc., 1985. **Economic Report of the President (1998). Photos courtesy L.M. Maestas, Sandia National Labs. Used with permission.
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Two reactions are necessary: -- oxidation reaction: -- reduction reaction: Zn Zn 2 + + 2 e - 2H + + 2 e - H 2 (gas) Adapted from Fig. 16.1, ELECTROCHEMICAL CORROSION Oxidation reaction Zn Zn 2+ + H + Ex: consider the corrosion of zinc in an acid solution Chapter 16 - ENME 382 Spring 2010 Section 0201 3 Other reduction reactions in solutions with dissolved oxygen: -- acidic solution -- neutral or basic solution O 2 + 4H + + 4 e - 2H 2 O O 2 + 2H 2 O + 4 e - 4(OH) - . (Fig. 16.1 is from M.G.
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ENME382 S2010 0201 ch16 - CHAPTER 16: CORROSION AND...

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