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Topic: Corrosion rate- Electrochemistry: Physical Chemistry  (Read 3115 times)

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Offline yoppo

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Corrosion rate- Electrochemistry: Physical Chemistry
« on: April 28, 2009, 05:42:01 PM »
Hi guys and girls!

I am absolutely clueless on how to start this. I have my final year exams for my degree Friday and this is a certain question to come up so anyone that can help I owe you!!

A metal is corroding in an oxygen free acid of pH = 1 at 298 K according to
the overall reaction M + 2H+ → M2+ + H2. From the data given below,
calculate the corrosion rate of the metal in A cm-2.
Data: the equilibrium potential E0 M2+/M = –0.76V and the solution contains
10–2 mol dm-3 M2+. The equilibrium exchange current density, i0 for the metal
is 10–3 A cm-2 and the transfer
coefficient α is 0.5. For the hydrogen evolution reaction, i0 = 10–8 A cm-2 and
E0 H+/H2 = 0.0V and α is 0.5.

I assume you have to use the Butler volmer equation somewhere but dont know how to start.

Any help would be appreciated,
Cliff

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