The corrosion rate of 99.9% nickel in seawater after immersion in seawater near the Panama Canal Zone for 16 years was o

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The corrosion rate of 99.9% nickel in seawater after immersion in seawater near the Panama Canal Zone for 16 years was observed to be 1.2 mpy (mils per year) [30]. (The corresponding corrosion current density is 2.8 x 10 A/cm².)
(a) Draw the hypothetical Evans diagram for this system when corrosion is under the control of the diffusion-limited oxygen reduction reaction. Assume that E,,02 +0.40 V vs. SHE and that 16,02 1.0 x 109 A/cm². Assume that the anodic reaction for nickel dissolution is under activation control with an anodic Tafel slope of +0.060 V. Use values for E,Ni and
foNi from Tables 3.1 and 7.4, respectively. (b) Based on the Evans diagram, what is the corrosion potential for nickel in seawater? (c) How does the corrosion potential from part (b) compare with the electrode potential for
nickel given in the galvanic series for seawater? (d) Sketch the anodic and cathodic experimental polarization curves which result from the
Evans diagram in part (a).