11-25+27-Lecture

11-25+27-Lecture - 1 Final Exam ➜ If A or B not required...

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Unformatted text preview: 1 Final Exam ➜ If A or B, not required ➜ Otherwise required ➜ Check website on 11th DEC for grade ______________________________ ➜ Lab #3 due 4 th Dec 2 Corrosion ENGR 213 CORROSION ➜ deteriorative properties ➜ response to environment; unexpected ➤ atmosphere, aqueous soln, soil, acid, base, etc ➜ metals ➤ May be highly susceptible ➜ ceramics ➤ relatively resistant ➜ polymers ➤ degradation 4 Electrochemical Corrosion ➜ Most common form of attack of metals ➜ Occurs when metals lose electrons and become ions ➜ Metal gradually consumed ➜ By-product(s) formed e.g., iron ⇒ rust ➜ Occurs most frequently in water or moist air 5 Corrosion “opportunity” CORROSION OF METALS ➜ Two important chemical steps ➜ Response to thermodynamic forces ➜ Minimises energy ➜ Oxidation ➤ Anode ➤ Gives electrons ➜ Reduction ➤ Cathode ➤ Receives electrons P M P M P ne P ne M M n n n n + → + → + + → + +-+-+ Dissimilar Metals ➜ electrode potential (V) of galvanic couple ➤ driving force for oxidation-reduction rxns ➤ measured V = difference in potential Half-cells...
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This note was uploaded on 03/26/2008 for the course ENGR 213 taught by Professor Dr.stubbs during the Fall '04 term at Texas A&M.

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11-25+27-Lecture - 1 Final Exam ➜ If A or B not required...

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