Interactions of sulphur anions and stainless steels at kraft pulp digesting temperature
✍ Scribed by J. Rämö; A. Kujala; M. Sillanpää; O. Hyökyvirta; S. Peltonen
- Publisher
- John Wiley and Sons
- Year
- 2001
- Tongue
- German
- Weight
- 197 KB
- Volume
- 52
- Category
- Article
- ISSN
- 0947-5117
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✦ Synopsis
Interactions of certain stainless steels (S30400, S31600, S31803, S32304) and sulphur anions, separately and in combination, at concentrations typical of kraft liquors were investigated using XRF and CER techniques. IC, ISE and ABC titration were applied in the modelling of behaviour of the sulphur anions. Nickel and sulphur enriched to the steel surfaces in all experiments. Abilities of molybdenum and chromium to remain in the surfaces appeared to be better than those of iron. Adhesion of sulphur onto austenitic grades was probably stronger than that of the duplex grades. Sulphide and combination of sulphur anions formed durable films, but films formed by thiosulphate possessed some gliding properties. For the solution, real amount of the sulphide was less than the added amount. Thiosulphate had a tendency to convert into sulphite.
Wechselwirkungen von bestimmten nichtrostenden Sta Èhlen (1.4301, 1.4401, 1.4462, 1.4362) und Schwefelanionen, einzeln und in Kombination, wurden bei Konzentrationen, wie sie typisch fu Èr Kraftzellstofflaugen sind, mittels XRF-und CER-Techniken untersucht. IC, ISE und ABC Titration wurde in der Modellierung des Verhaltens der Schwefelanionen eingesetzt. Nickel und Schwefel war bei allen Versuchen an der Stahloberfla Èche angereichert. Die Fa Èhigkeiten des Molybda Èns und des Chroms, an den Oberfla Èchen zu verbleiben, erschien besser als die des Eisens. Die Adha Èsion von Schwefel an den austenitischen Gu Èten war sta Èrker als die bei den Duplex-Gu Èten. Sulfid und Kombinationen von Schwefelanionen formten dauerhafte Filme; die durch Thiosulfat gebildeten Filme besaûen aber einige Gleiteigenschaften. Fu Èr die Lo Èsung war der tatsa Èchliche Gehalt an Sulfid geringer als die zugegebene Menge. Thiosulfat zeigte Tendenzen, sich in Sulfit umzuwandeln.
Experimental
2.1 Autoclave simulations
The immersion experiments were performed with a recirculation system in which experimental solutions were recycled. Hydroxide, sulphur compound(s), carbonate and chloride were weighted into nitrogen bubbled water to concentrations given in Table . A sample for solution analysis Materials and Corrosion 52, 531±539 (2001) Stainless steels at kraft pulp digesting temperature 531
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