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?