Na2SO4 Induced Hot Corrosion of Aluminized Low Carbon Steel at 700 °C

Mohammad Badaruddin

doi:10.4028/www.scientific.net/AMM.493.761

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 493Na2SO4 Induced Hot Corrosion of Aluminized Low...

Na₂SO₄ Induced Hot Corrosion of Aluminized Low Carbon Steel at 700 °C

Abstract:

The oxidation kinetics of hot-dip aluminized AISI 1020 steel with Na₂SO₄deposit was investigated at 700 °C for 49 h in static air. The scale morphologies were observed by means of metallograpy, scanning electron miscroscopy (SEM), electron dispersive spectroscopy (EDS) and X-ray analyses. The accelerated oxidation of aluminized steel was attributed to the formation of aluminum-sulphides which allowed the rapid diffusion of Fe ions in the aluminide layer to the formation of iron oxide. In addition, the Al-sulphides precipitations in the alumina scale causes the Al-depletion such that Al₂O₃ layer fails to form a protective layer. Consequently, the kinetics rate of aluminized was increased.

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Applied Mechanics and Materials (Volume 493)

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761-766

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https://doi.org/10.4028/www.scientific.net/AMM.493.761

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Online since:

January 2014

Authors:

Mohammad Badaruddin

Keywords:

Al-Sulphides, Aluminized AISI 1020 Steel, Hot-Corrosion, Na₂SO₄ Deposit, Protective Al₂O₃

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