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Unformatted text preview: electrode that is immersed in a solution of Fe 2+ ions having a concentration of 0.1 M. At what temperature will the potential between the two electrodes be +0.140 V? 17.12 A thick steel sheet of area 400 cm 2 is exposed to air near the ocean. After a one-year period it was found to experience a weight loss of 375 g due to corrosion. To what rate of corrosion, in both mpy and mm/yr, does this correspond? 17.17 Lead experiences corrosion in an acid solution according to the reaction Pb + 2H + → Pb 2+ + H 2 The rates of both oxidation and reduction half-reactions are controlled by activation polarization. (a) Compute the rate of oxidation of Pb (in mol/cm 2-s) given the following activation polarization data: For Lead For Hydrogen V (Pb/Pb 2 + ) = − 0.126 V V (H + /H 2 ) = 0 V i = 2 × 10 –9 A/cm i 2 = 1.0 × 10 –8 A/cm β = +0.12 2 β = –0.10 (b) Compute the value of the corrosion potential....
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This note was uploaded on 06/02/2011 for the course ECONMICS ECN204 taught by Professor Brenan during the Spring '08 term at Ryerson.
- Spring '08