1. (a) Demonstrate that the CPR is related to the corrosion current density i (A/cm2) through the expression
where K is a constant, A is the atomic weight of the metal experiencing corrosion, n is the number of electrons associated with the ionization of each metal atom, and is the density of the metal.
(b) Calculate the value of the constant K for the CPR in mpy and i in μA/cm2 (10−6 A/cm2).
2. Compute the corrosion penetration rate, in mpy, for the corrosion of iron in citric acid (to form Fe2+ ions) if the corrosion current density is 1.15 ×10−5 A/cm2.
