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1. The influence of increasing solution velocity on the overvoltage-versus-log current density behavior for a solution that experiences com- bined activation-concentration polarization is indicated in Figure 17.26. On the basis of this behavior, make a schematic plot of corrosion rate versus solution velocity for the oxidation of a metal; assume that the oxidation reaction is controlled by activation polarization.
2. Briefly describe the phenomenon of passiv- ity. Name two common types of alloy that passivate.
3. Why does chromium in stainless steels make them more corrosion resistant in many en- vironments than plain carbon steels?
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Please include images of: composition cells, stress cells, concentration cells, coatings, inhibitors, sacrificial anodes, impressed voltages, anodic protection, cold worked grain structure and recrystallized grain structure.
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