Chapter 17: Problem 1
(a) Briefly explain the difference between oxidation and reduction electrochemical reactions. (b) Which reaction occurs at the anode and which at the cathode?
Chapter 17: Problem 1
(a) Briefly explain the difference between oxidation and reduction electrochemical reactions. (b) Which reaction occurs at the anode and which at the cathode?
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Get started for freeWhy does chromium in stainless steels make them more corrosion resistant than plain carbon steels in many environments?
(a) Cite the major differences between activation and concentration polarizations. (b) Under what conditions is activation polarization rate controlling? (c) Under what conditions is concentration polarization rate controlling?
(a) Demonstrate that the CPR is related to the corrosion current density \(i\left(\mathrm{~A} / \mathrm{cm}^{2}\right)\) through the expression $$ \mathrm{CPR}=\frac{K A i}{n \rho} $$ where \(K\) is a constant, \(A\) is the atomic weight of the metal experiencing corrosion, \(n\) is the number of electrons associated with the ionization of each metal atom, and \(\rho\) is the density of the metal. (b) Calculate the value of the constant \(K\) for the CPR in mpy and \(i\) in \(\mu \mathrm{A} / \mathrm{cm}^{2}\left(10^{-6} \mathrm{~A} / \mathrm{cm}^{2}\right)\).
(a) Describe the phenomenon of dynamic equilibrium as it applies to oxidation and reduction electrochemical reactions. (b) What is the exchange current density?
Briefly explain why, for a small anode-to-cathode area ratio, the corrosion rate will be higher than for a large ratio.
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