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 passivity. 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?