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# ch16 - Chapter 16 Corrosion and Degradation of Materials...

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Chapter 16 Corrosion and Degradation of Materials Concept Check 16.1 Question: Would you expect iron to corrode in water of high purity? Why or why not? Answer: Iron would not corrode in water of high purity because all of the reduction reactions, Equations 16.3 through 16.7, depend on the presence of some impurity substance such as H + or M n + ions or dissolved oxygen.

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Concept Check 16.2 Question: Modify Equation 16.19 for the case in which metals M 1 and M 2 are alloys. Answer: For this case, it is necessary to take into account the compositions of metals M 1 and M 2 . If [M 1 ] and [M 2 ] represent concentrations of metals M 1 and M 2 in their respective alloys, the equation becomes Δ V = V 2 D V 1 D () RT nF ln [M 1 n + ][M 2 ] 2 n + 1 ]
Concept Check 16.3 Question: Briefly explain why concentration polarization is not normally rate controlling for oxidation reactions. Answer: Concentration polarization is not normally rate controlling for oxidation reactions because there will always be an unlimited supply of metal atoms at the corroding electrode interface.

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Concept Check 16.4 Question: (a) From the galvanic series (Table 16.2), cite three metals or alloys that may be used to galvanically protect nickel in the active state. (b) Sometimes galvanic corrosion is prevented by making an electrical contact between both metals in the couple and a third metal that is anodic to these other two.
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ch16 - Chapter 16 Corrosion and Degradation of Materials...

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