This preview shows
page 1. Sign up
to
EMA 4324 - Problem Set 12
12-1 [Callister [5th edition] For each of the metals listed below, compute the Pilling-Bedworth ratio.
Also, on the basis of this value, specify whether or not you would expect the oxide scale that
forms on the surface to be protective; justify your decision.
12-2 [Jones 13-2] Determine the cathodic overvoltage necessary to reduce the corrosion rate to 0.5
μ
A/cm
2
for a metal with an unpolarized corrosion rate of 300
This is the end of the preview.
Sign up
to
access the rest of the document.
Unformatted text preview: μ A/cm 2 , having β a = 0.065 V and β c = 0.12 V at the corrosion potential. 12-3 [Jones 13-3] Determine the applied current density necessary in Problem 13-2 assuming [a] activation control and [b] concentration control of the cathodic process at the corrosion potential. 8.90 Bi 2 O 3 9.80 Bi 6.95 SnO 2 7.30 Sn 5.89 ZrO 2 6.51 Zr density, g/cm 3 substance density, g/cm 3 substance...
View
Full Document
- Fall '09
- Staff
- Oxide, unpolarized corrosion rate
-
Click to edit the document details
