1.

Calculate the corrosion penetration rate of iron that corroding at an electrochemical corrosion rate of 1 microampere/sq. centimeters?(a) 0.212 mpy(b) 0.11 mpy(c) 0.46 mpy(d) 0.64 mpyI have been asked this question during an interview.My query is from Testing in section Corrosion Testing of Corrosion Engineering

Answer»

The correct answer is (C) 0.46 MPY

To explain I would say: Corrosion PENETRATION rate = K (ai/nD)

a = atomic weight of IRON = 55.8 g

i = current density = 1 micrometer/sq. Centimeters

n = valency CHANGE = 2

D = density of iron = 7.86 g/cm^3

K = 0.129 for steel

Corrosion penetration rate = 0.129 * [(55.8) / (2*7.86)] = 0.46 mpy.


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