Lecture 14 - ENGR 4250 Advanced Materials Engineering Lecture 14 CORROSION AND DEGRADATION Ch 17 Callister 8/e Dr A Keshavarz ENGR 4250U CHAPTER 17

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ENGR 4250 – Advanced Materials Engineering Lecture 14 CORROSION AND DEGRADATION Ch 17; Callister 8/e Dr. A. Keshavarz - ENGR 4250U
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ISSUES TO ADDRESS. .. Why does corrosion occur ? What metals are most likely to corrode? How do temperature and environment affect corrosion rate? How do we suppress corrosion? CHAPTER 17: CORROSION AND DEGRADATION Dr. A. Keshavarz - ENGR 4250U
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Deteriorative Mechanisms • Metals: – Material loss by dissolution – corrosion – Formation of non metallic scale – oxidation • Ceramic: – Resistant –but occurs at only at high temperatures & extreme environment – corrosion • Polymers: degradation – Dissolves in liquid solvents; or swell – UV rays or heat – molecular structure alteration Dr. A. Keshavarz - ENGR 4250U
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Corrosion of Metals • Destructive attack of a metal • Electrochemical reaction • Begins at the surface • Advantages - etching Dr. A. Keshavarz - ENGR 4250U
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Bimini and Cat Cay Sapona Dr. A. Keshavarz - ENGR 4250U
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Corrosion : -- the destructive electrochemical attack of a material. -- Al Capone's ship, Sapona, off the coast of Bimini. Cost: ?? -- 4 to 5% of the Gross National Product (GNP)* -- 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. THE COST OF CORROSION Dr. A. Keshavarz - ENGR 4250U
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REDOX Reactions Dr. A. Keshavarz - ENGR 4250U
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• If a chemical reaction is driven by an external applied voltage , as in electrolysis , or if a voltage is created by a chemical reaction as in a battery , it is an electrochemical reaction. Dr. A. Keshavarz -
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This note was uploaded on 06/02/2011 for the course ECONMICS ECN204 taught by Professor Brenan during the Spring '08 term at Ryerson.

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Lecture 14 - ENGR 4250 Advanced Materials Engineering Lecture 14 CORROSION AND DEGRADATION Ch 17 Callister 8/e Dr A Keshavarz ENGR 4250U CHAPTER 17

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