MODELING OF OXIDATION KINETICS
IN AIR OF STEEL-T21 ALLOY COATED BY
SIMULTANEOUS GERMANIUM-DOPED ALUMINIZING-SILICONIZING PROCESS BY
MULTIPLE LINEAR REGRESSION USING MATLAB |
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 102h
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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