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Finite Element Analysis Using
Matlab of Oxidation Kinetics inAir of Steel-T21 Alloy Coated by
Simultaneous Germanium-Doped Aluminizing Process |
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This work includes the
application of a pack cementation of germanium-doped aluminum
and silicon coatings on low alloy steel type-T21 yields a
significant improvement in the oxidation. Steel-T21 was coated
with germanium-doped aluminizing-siliconizing. Diffusion coating
was carried out at 1050°C for 6h under an Ar atmosphere by
simultaneous germanium-dopded aluminizing-siliconizing process.
Cyclic oxidation tests were conducted on the coated steel-T21
alloy in the temperature range oxide 300-900°C in air for
60h at 3h cycle.
The results showed that the oxidation kinetics for coated
system in air was found to be
parabolic. Oxide phases that formed on coated system are SiO2
and AL2O3. Mathematical model using MATLAB show that there is
multiple linear model for oxidation kinetics. |
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