prbset074324

# prbset074324 - Cu 2 2e-= Cu E = 0.350 v j o = 10-4 A/cm 2 H...

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EMA 4324 Problem Set 7 7-1 [Jones 3-9] A copper valve is used in the waste exit line from a pharmaceutical process reactor which is producing iodine-containing organics. The waste stream is composed of air-saturated 15% sulfuric acid with the following impurities: ferric sulfate, ferrous sulfate, potassium iodide and iodine. From the following electrochemical data, determine the corrosion rate of copper in this brew. Assume all Tafel constants to be 0.1.
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Unformatted text preview: Cu +2 + 2e-= Cu: E = 0.350 v, j o = 10-4 A/cm 2 H + + 1e-= H 2 : E = 0.020 v, j o = 2x10-7 A/cm 2 [on Cu] i L [H + to H 2 ] = 0.2 A/cm 2 , i L [H 2 to H + ] = 10-4 A/cm 2 Fe +3 + 1e- = Fe +2 : E = 0.850 v, j o = 8x10-5 A/cm 2 [on Cu] i L [Fe +3 to Fe +2 ] = 6x10-3 A/cm 2 , i L [Fe +2 to Fe +3 ] = 2x10-4 A/cm 2 I 2 + 2e-= 2I-: E = 0.430 v, j o = 10-3 A/cm 2 [on Cu] i L [I 2 to I-] = 2x10-3 A/cm 2 , i L [I-to I 2 ] = 2x10-2 A/cm 2...
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