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

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