Calculate the value of the constant K for the CPR in mpy and i in μA/cm2 (10−6 A/cm2).

1. (a) Demonstrate that the CPR is related to the corrosion current density (A/cm2) through the expression


where is a constant, is the atomic weight of the metal experiencing corrosion, 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 for the CPR in mpy and in μA/cm2 (106 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 ×10A/cm2.

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