Metallic aluminum is easily oxidized by oxygen. However, the thin oxide layer formed, protects the rest of the metal from further oxidation. The reaction is as follows: Al (s)02 (g) > Al203 (s) The vapor pressure of the solid aluminum oxide is negligibly small Consider a plate of aluminum 1m x 1m, initially free from any oxide, placed inside a helium-oxygen mixture at 1 atm and 150 °C. At a point 2mm from the surface of the metal, partial pressure of oxygen in helium is 0.21 atm. The oxidation kinetics is considered fast. Diffusivity of the oxygen in helium under the conditions of the problem is 0.75 x 104 m2/s 1- Derive an equation for the flux of oxygen to the surface of the aluminum 2- Determine the rate of formation of oxide on one face the aluminum plate 3- Will gas pressure changes affect the rate of oxidation of the metal? Explain by referring to the flux equation you have derived

Question
Metallic aluminum is easily oxidized by oxygen. However,
the thin oxide layer formed, protects the rest of the metal
from further oxidation. The reaction is as follows:
Al (s)02 (g)
> Al203 (s)
The vapor pressure of the solid aluminum oxide is
negligibly small
Consider a plate of aluminum 1m x 1m, initially free from
any oxide, placed inside a helium-oxygen mixture at 1 atm
and 150 °C. At a point 2mm from the surface of the metal,
partial pressure of oxygen in helium is 0.21 atm. The
oxidation kinetics is considered fast. Diffusivity of the
oxygen in helium under the conditions of the problem is
0.75 x 104 m2/s
1- Derive an equation for the flux of oxygen to the surface
of the aluminum
2- Determine the rate of formation of oxide on one face
the aluminum plate
3- Will gas pressure changes affect the rate of oxidation of
the metal? Explain by referring to the flux equation
you have derived

Image Transcription

Metallic aluminum is easily oxidized by oxygen. However, the thin oxide layer formed, protects the rest of the metal from further oxidation. The reaction is as follows: Al (s)02 (g) > Al203 (s) The vapor pressure of the solid aluminum oxide is negligibly small Consider a plate of aluminum 1m x 1m, initially free from any oxide, placed inside a helium-oxygen mixture at 1 atm and 150 °C. At a point 2mm from the surface of the metal, partial pressure of oxygen in helium is 0.21 atm. The oxidation kinetics is considered fast. Diffusivity of the oxygen in helium under the conditions of the problem is 0.75 x 104 m2/s 1- Derive an equation for the flux of oxygen to the surface of the aluminum 2- Determine the rate of formation of oxide on one face the aluminum plate 3- Will gas pressure changes affect the rate of oxidation of the metal? Explain by referring to the flux equation you have derived

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