For each of the metals listed in the following table, compute the Pilling–Bedworth ratio. Also, on the basis of this value, specify whether you would expect the oxide scale that forms on the surface to be protective, and then justify your decision. Density data for both the metal and its oxide are also tabulated.
Metal | Metal Density (g/cm3) | Metal Oxide | Oxide Density (g/cm3) |
Zr | 6.51 | ZrO2 | 5.89 |
Sn | 7.30 | SnO2 | 6.95 |
Bi | 9.80 | Bi2O3 | 8.90 |
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