Paper Title:
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 as well as determination of chemical composition of micro sites and distribution of elements on cross-sections is reported. Water-wall tubes were exposed in steam boiler for up to two years period. Common tubes produced from 16Mo3 steel suffered sulphide and molten salts corrosions. Thermal sprayed tubes with the single layer of 70%Ni 30%Cr alloy demonstrate better corrosion resistance, but become susceptible to sulphide corrosion due to presence of internal voids and cracks. Double layer Al2O3/Ni-30Cr coatings withstood corrosion attack for more than one year of operation, and then failed due to internal heterogeneity and crack generation.

  Info
Periodical
Solid State Phenomena (Volume 165)
Edited by
Andrejus H. Marcinkevičius and Algirdas V.Valiulis
Pages
110-117
DOI
10.4028/www.scientific.net/SSP.165.110
Citation
J. Łabanowski, J. Ćwiek, "High Temperature Corrosion of Evaporator Tubes with Thermal Sprayed Coatings", Solid State Phenomena, Vol. 165, pp. 110-117, 2010
Online since
June 2010
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Price
$32.00
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