(Answered)-8. A copper valve is used in the waste exit line from a - (2025 Updated Original AI-Free Solution

Question

8.? 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 electrochemical data listed below, determine the corrosion rate of the copper valve in this system. Assume all Tafel constants are 0.1 V

Cu = Cu²⁺ + 2e^-? ;? ????? e = 0.35 V, i_o = 10^-4 A/cm²

H₂ = 2H⁺ + 2e^-? ; ??????? e = 0.02 V, i_o = 2 x 10^-7 A/cm² (on Cu)

??????????????????????????????????? I_lim,(H+?H2) = 2 x 10^-1 A/cm², i_{Lim, (H2?H+)} = 10^-4 A/cm²

Fe²⁺ = Fe³⁺ + e^-? ;? ?????? e = 0.850 V, i_o = 8 x 10^-5 A/cm² (on Cu)

??????????????????????????????????? I_{Lim,(Fe3+?Fe2+)} = 6 x 10^-3 A/cm²

??????????????????????????????????? I_{Lim,(Fe2+?Fe3+)} = 2 x 10^-4 A/cm²

I₂ + 2e^- = 2I^-? ;? ?????????? e = 0.430 V, i_o = 10^-3 A/cm²,

??????????????????????????????????? I_Lim,(I2?I-) = 2 x 10^-3 A/cm²,

????????????????????????????????????????? I_Lim,(I-?I2) = 2 x 10^-2 A/cm².