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Corrosion of Pure Cr and Ni–30Cr Alloy by Soda–Lime–Silicate Melts: Study of Simplified Systems
Ist Teil von
Oxidation of metals, 2016-02, Vol.85 (1-2), p.3-16
Ort / Verlag
New York: Springer US
Erscheinungsjahr
2016
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The corrosion characteristics of model chromia-forming alloys (
i.e.
pure Cr and Ni–30 wt%Cr alloy) were studied in molten soda–lime–silicate (
i.e.
Na
2
O–CaO–xSiO
2
, x = 3 or 6, molar composition) at 1100 and 1150 °C using electrochemical techniques coupled with ex situ observations. High Cr activity of pure Cr led to high corrosion rates and also the inability of the material to develop a long term protective oxide scale after a preoxidation treatment. By contrast, the Cr
2
O
3
scale built on preoxidized Ni–30Cr exhibited a protective behavior at 1100 °C. The variation of basicity of the silicate melts showed a minor influence on the corrosion behavior of both materials. An increase in the temperature up to 1150 °C led to higher solubility of Cr
2
O
3
, and thus did not allow the growth of a protective oxide scale on Ni–30Cr.