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High temperature corrosion of evaporator tubes with thermal sprayed coatings

Abstract

Degradation examinations of outer surface of low-emission steam boiler evaporator tubes are presented in the paper. Metallographic evaluation of scale morphology, its micro sites chemical composition analysis and distribution of elements on cross sections have been performed. Water-wall tubes were exposed in steam boiler for up to two years period. Common tubes made of 16Mo3 steel suffered sulphide and molten salts corrosions. Thermal sprayed tubes with the single layer of 70%Ni 30%Cr alloy show better corrosion resistance, but become also susceptible to sulphide corrosion due to presence of internal voids and cracks. Double layer Al2O3/Ni-30Cr coatings withstand corrosion attack for more than one year operation, and then failed due to internal heterogeneity and cracks generation.

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Category:
Articles
Type:
artykuły w czasopismach recenzowanych i innych wydawnictwach ciągłych
Published in:
Solid State Phenomena no. 165, pages 110 - 117,
ISSN: 1012-0394
Language:
English
Publication year:
2010
Bibliographic description:
Łabanowski J., Ćwiek J.: High temperature corrosion of evaporator tubes with thermal sprayed coatings// Solid State Phenomena. -Vol. 165., (2010), s.110-117
Verified by:
Gdańsk University of Technology

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