Podrobnosti záznamu

Název
    Reaction products and corrosion of molybdenum electrode in glass melt containing antimony oxides and sodium sulfate
Autor
    Langrová, Anna
    Matěj, J.
Jazyk
    anglicky
Typ dokumentu
    článek v odborném periodiku
Zdrojový dokument - seriál
    Ceramics - Silikáty
Svazek/č.
    Roč. 56, č. 3
Strany
    s. 280-285
Rok
    2012
Poznámky
    Rozsah: 6 s.
Předmětová kategorie
    antimony oxides
    corrosion
    glass melt
    Molybdenum electrode
    sulfate
Klíčové slovo
    Antimony
    Containing
    Corrosion
    Electrode
    Glass
    Melt
    Molybdenum
    Oxides
    Products
    Reaction
    Sodium
    Sulfate
Abstrakt (anglicky)
   The products on the interface of a molybdenum electrode and glass melt were investigated primarily at 1400°C in three model glass melts without ingredients, with 1 % Sb2O3 and with 1 % Sb 2O3 and 0.5 % SO3 (wt. %), both under and without load by alternating current. Corrosion of the molybdenum electrode in glass melt without AC load is higher by one order of magnitude if antimony oxides are present. The corrosion continues to increase if sulfate is present in addition to antimony oxides. Isolated antimony droplets largely occur on the electrode-glass melt interface, and numerous droplets are also dissipated in the surrounding glass if only antimony oxides are present in the glass melt. A comparatively continuous layer of antimony occurs on the interface if SO 3 is also present, antimony being always in contact with molybdenum sulfide. Almost no antimony droplets are dissipated in the glass melt. The total amount of precipitated antimony also increases.
   The presence of sulfide on the interface likely facilitates antimony precipitation. The reaction of molybdenum with antimony oxides is inhibited in sites covered by an antimony layer. The composition of sulfide layers formed at 1400°C approximates that of Mo 2S3. At 1100°C, the sulfide composition approximates that of MoS4. Corrosion multiplies in the glass melt without additions through the effect of AC current, most molybdenum being separated in the form of metallic particles. Corrosion also increases in the glass melt containing antimony oxides. This is due to increased corrosion in the neighborhood of the separated antimony droplets. This mechanism also results in the loosening of molybdenum particles. The amount of precipitated antimony also increases through the effect of the AC current. AC exerts no appreciable effect on either corrosion, the character of the electrode-glass interface, or antimony precipitation in the glass melt containing SO3.
Přispěvatel
    AV ČR Brno, Geologický ústav
Kód přispěvatele
    AV ČR, GLÚ
Zdrojový formát
    U
Datum importu
    19. 3. 2014