CHEN 5845
Wednesday, January 10th, 2024
In Class Problem 1
1. Plain carbon steel immersed in seawater has a uniform corrosion rate. The density of iron is
7.87 g/cm3. The atomic weight of Fe is 55.8 g/mol.
a) Calculate the corrosion current density in microamperes per square centimeter, when 1 g/cm2
year is removed, assuming that the corrosion current is given by
Fe  Fe2+ + 2e-
b) Calculate the weight loss after 1 year, if the penetration rate is 5.0 mpy (mils per year, where 1
mil = 0.001 in).
c) What is the corrosion rate in mils/year of the corrosion rate used in part a?
d) What is the corrosion current density in microamperes per square centimeter if the weight loss
in part b is used instead?