10. How does the rate of corrosion correlate with the voltage driving force? A.

Question

10. How does the rate of corrosion correlate with the voltage driving force? A. Large voltages cause high corrosion rates. B. Small voltages cause high corrosion rates. C. Voltages greater than +1.0 V cause high cor- rosion rates. D. There is no general correlation between volt- age and corrosion rate. 11. How does the diffusion rate of metal ions in liq- uid water compare with the diffusion rates of the same ions in a solid oxide film? A. Diffusion in liquid water is much slower. B. Diffusion occurs in water and solids at about the same rate. C. Diffusion in liquid water is much faster. D. It is impossible to generalize

Explanation / Answer

10 A true: large voltage difference causes more corrosion rate because there will be more flow of electron which increases the corrosion

11C true: Diffusion in liquid water is much faster: metal ion will make electrolyte solution in which ion move much faster. but in oxide film that is gaseous film there will be no carrier for movement of ions

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