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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 587-596 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Corrosion in High-Temperature-BoilersExperiences with corrosion of highly heat resisting steels in high temperature boilers in Germany are discussed by means of the working 600° boilers after 40 000 h of operation. Steam scalling in pure steam is very low. As soon as steam will be solid noticeably corrosive attacks will become dangerous. According to the high standard to water treatment such effects could be prevented so that damages caused by the water must be considered unusual.Damages caused by smoke occured as soon as the flying ashes contained alkali sulfates. The area of damage will be there where a eutectic mixture of sulfates could melt. There are some measures how to prevent this corrosion.Steels containing vanadium may not be used above 600°C as vanadium scaling might occur which was learnt in burning oils containing vanadium.
    Notes: Die Erfahrungen über das Korrosionsverhalten der hochwarmfesten Stähle in Hochtemperaturkesseln werden in Deutschland an Hand der im Betriebe befindliche 600°-Kessel nach rd. 40 000-stündiger Betriebszeit besprochen. Die Dampfzunderung in reinem Dampf ist gering. Gefahren treten erst auf, sobald der Dampf merkbar verunreinigt ist. dieses läß sich bei dem heutigen hohen Stande der Wasseraufbereitung vermeiden, so daß Korrosionsschäden von der Wasserseite her als ungewöhnlich zu betrachten sind.Schäden von der Rauchgasseite her sind bekannt geworden, sobald in der Flugasche Alkalisulfate vorkommen. Der Schadensbereich liegt in erster Linie dort, wo ein Eutektikum der Sulfate zu schmelzen vermag. Es werden Wege angegeben, wie diese Korrosion zu vermeiden ist.Vanadinhaltige Stäle scheiden für Temperaturen oberhalb 600° aus, da dann dieselbe Vanadinzunderung auftreten kann, welche von der Verfeuerung vanadinhaltiger Öle her bekannt ist.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
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