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Digitale Medien

Sodium sulfate: Deposition and dissolution of silica (1989)

Jacobson, Nathan S.

Springer

Oxidation of metals 31 (1989), S. 91-103

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ISSN: 1573-4889

Schlagwort(e): hot corrosion ; Na2SO4 ; SiC, Si3N4

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau

Notizen: Abstract The hot-corrosion process for SiO2-protected materials involves deposition of Na2SO4 and dissolution of the protective SiO2 scale. Dew points for Na 2SO4 deposition are calculated as a function of pressure, sodium content, and sulfur content. Expected dissolution regimes for SiO2 are calculated as a function of Na2SO4 basicity, hence $$P_{SO_3 } $$ generated by fuels with 0.5% and 0.05% S. Controlled-condition burner-rig tests on quartz verify some of these predicted dissolution regimes. However, the basicity of Na2SO4 is not always a simple function of $$P_{SO_3 } $$ (Na2O) show that carbon creates basic conditions in Na2SO4, which explains the extensive corrosion of SiO2-protected materials containing carbon, such as SiC.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00665488

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