8. Converting Corrosion Rates: To convert corrosion rate between the mils per year (mpy) and the metric equivalent millimeter per year (mm/y), you can use the following equation:
1 mpy = mm/y = 25.4 microm/y
To calculate the corrosion rate from metal loss:
mm /y = 87.6 x (W / DAT)
where:
W = weight loss in milligrams D = metal density in g /cm3 A = area of sample in cm2 T = time of exposure of the metal sample in hours

19. ASSIGNMENTS

20. ASSIGNMENT (1)

21. Assignment (2)
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
ρ 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).