Question
Question 17: (a) Inert Al 2 O 3 powder is sprinkled over the surface of iron before it is oxidized under conditions that yield FeO.
Question 17:
(a) Inert Al2O3 powder is sprinkled over the surface of iron before it is oxidized under conditions that yield FeO. Where will the alumina particles (i.e. Al2O3) be located after oxidation if DFe >> Do in FeO?
(b) The diffusion coefficients of several organic molecules in natural rubber are plotted as a function of temperature in the figure below. In a brief one sentence explanation provide a rationalization for the ranking of the diffusivities.
(c) NiO is an ionic compound with a rocksalt structure. Identify an impurity dopant that could be used to decrease the diffusivity of Ni and hence slow oxidation.
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