Question

Which of the following expression is used for electrochemical techniques to determine the corrosion penetration rate?

(a) Corrosion penetration rate = K (ai/D)

(b) Corrosion penetration rate = K (ai/nD)

(c) Corrosion penetration rate = (ai/nD)

(d) Corrosion penetration rate = (ai/nD)

This question was posed to me by my college professor while I was bunking the class.

My enquiry is from Testing topic in section Corrosion Testing of Corrosion Engineering

Answer 1

Right answer is (b) Corrosion penetration rate = K (ai/nD)

The explanation: The corrosion rate expression that is used for electrochemical techniques to determine corrosion penetration rate is K (ai/nD) where a is the atomic weight of the metal, i is current density (in microamperes per sq. centimeters), n is the number of electrons lost, D is the density of metal, K is constant depends on the penetration rate desired.