GATE MT 2020 Q44. Iron is corroding in fresh water which has dissolved oxygen concentration of 15 mM. The anodic current density at an overpotential of 120 mV is ___________ A.cm^2 (round off to three decimal places). A. Anodic Tafel slope is 0.06 V. B. Diffusion coefficient of oxygen is 2.42810^-5 cm^2 S^-1. C. Diffusion layer thickness is 0.06 cm.