(a) Make a reasonably accurate sketch of Evan's diagram for iron immersed in vigorously agitated diluted hydrochloric solution at pH 5 at 30 C. The surface to volume ratio of this iron piece is small. In other words, there is no change in solution pH. The diagram should exhibit correct corrosion potential (vs SHE) and corrosion current density. (5 mark) = = 10,02 = 0.06 A/cm2 1o, Fe = 0.01 A/cm2 Erev,02 = 0.5 V Erev, Fe = -0.44 V R = 8.314 J K-1 mol-1 F = 96485 C mol-1 bc = 0.12 V ba = 0.04 V = (b) If the solution become stagnant, how will this affect the appearance of Evan's diagram and consequently corrosion behaviour? It is not necessary to redraw the diagram. (2 mark)