Quiz10spring2004 - ENSC 3313, Spring 2004 Quiz 10 ANSWERS...

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ENSC 3313, Spring 2004 Quiz 10 ANSWERS Name ________________________________ Answer any 4 questions only , 1 point each 1. Explain the thrust of this figure to do with corrosion. On each segment, I have blacked out the words anode and cathode . Please indicate by an ‘A’ or a ‘C’ which is which in all instances. These illustrate oxygen concentration cells. Low oxygen regions are anodes because high oxygen regions are cathodes because they participate in a reaction that eliminates electrons from the system. 2 H 2 O + O 2 + 4 e 4 (OH) The anode has to provide electrons continually, so creates ions continually, so corrodes. 2. In the following figure, what type of corrosion prevention is being represented and how does it work? This is an illustration of cathodic protection by use of a sacrificial anode (the magnesium) to protect the more cathodic pipe (typically iron). In the galvanic series, magnesium is anodic to iron so this arrangement sets up a galvanic cell. The copper wire serves as an electron
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This note was uploaded on 01/10/2012 for the course ENSC 3313 taught by Professor Staff during the Fall '11 term at Oklahoma State.

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Quiz10spring2004 - ENSC 3313, Spring 2004 Quiz 10 ANSWERS...

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