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- W1968821811 abstract "Abstract Co−25 w / o Cr alloys containing 7·5 w / o W, 5 w / o Fe, 5 w / o Fe-3 w / o Mn or 5 w / o Fe-5 w / o oAl all undergo rapid parabolic sulphidation in H 2 -10%H 2 S atmospheres in the temperature range 800–1000°C. Unusually compact, multi-layered scales are formed. The outer layer consists principally of Co 4 S S from which Cr x S y dendrites precipitate on cooling from the sulphidation temperature. The inner layer is probably a cobalt sulphide/chromium sulphide solid solution during the reaction, although at room temperature metallic cobalt is found in the grain boundaries. Neither tungsten nor iron plays a significant role in the sulphidation. Manganese and aluminium sulphidize internally, the precipitates being carried over into the inner scale layer as the alloy/scale interface recedes. The distribution of the aluminium-rich sulphide in the scale follows that of the CoAl phase in the alloy. The rate-controlling mechanism appears to be diffusion of Co 2+ and Cr 3+ ions across the inner scale layer. Manganese and aluminium-rich sulphides slow down the process by a blocking mechanism, and are therefore beneficial to the sulphidation resistance. Tungsten and iron have little effect and the sulphidation rates of alloys containing these elements are virtually identical to those of binary Co―Cr alloys." @default.
- W1968821811 created "2016-06-24" @default.
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- W1968821811 date "1972-07-01" @default.
- W1968821811 modified "2023-09-24" @default.
- W1968821811 title "Sulphidation of cobalt-based alloys" @default.
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- W1968821811 doi "https://doi.org/10.1016/s0010-938x(72)90063-7" @default.
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