CORROSION ENGINEERING. PLEASE ANSWER A AND B ASAP. I WILL LEAVE A GOOD RATING IMMEDIATELY!

Problem 1: Hydrogen permeation Please find in the table below values for AISI 4340 steel of the hydrogen cathodic current density ic and the steady state permeation current j as a function of the overpotential , measured using the Devanathan-Stachurski model. Test parameters: Membrane thickness L=0.02cm Temperature T=293K Faraday constant F=96484C/mol Gas constant R=8.314J/molK Transfer coefficient =0.5 Half-rise time t1/2=209.72s Table: Kinetic Data for Hydrogen Evolution and Hydrogen Permeation in chromiumnickel-molybdenum AISI 4340 steel a) Please calculate the hydrogen diffusion coefficient D(cm2/s) in AISI 4340 based on equation 8.30 . b) Please extract the modified exchange current density i0(A/cm2) using the data provided, based on equation 8.40