Assessment of Evaporator Tubes Corrosion in Low-Emission Steam Boilers

• Autorzy: Łabanowski J. , Topolska S. , Ćwiek J.
• Języki publikacji: EN

Abstrakty

EN

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 sulfide 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 sulfide corrosion due to presence of internal voids and cracks. Double layer Al2O3/Ni-30Cr coatings withstand corrosion attack for more than one year operation, then failed due to internal heterogeneity and cracks generation.

Słowa kluczowe

EN

low-emission steam boiler; evaporator tubes; sulfide corrosion; thermal sprayed coatings

• Wydawca: Politechnika Gdańska
• Czasopismo: Advances in Materials Science
• Rocznik: 2008
• Tom: Vol. 8, nr 4(18)
• Strony: 14--21
• Opis fizyczny: Bibliogr. 5 poz., rys., fot., tab.

Twórcy

autor

Łabanowski J.

autor

Topolska S.

autor

Ćwiek J.

• Department of Materials Technology and Welding, Gdansk University of Technology, 11/12 Narutowicza, 80-952 Gdansk, Poland

Bibliografia

• 1. G.Y. Lai, High-temperature corrosion of engineering alloys, ASM International, 1997.M.A.
• 2. J. Łabanowski, J. Ćwiek, S. Topolska, High temperature corrosion of evaporator tubes in low-emission steam boilers. Advances in Materials Science, Vol. 7, No.2(12) June 2007 27-31.
• 3. Uusitalo, P.M.J. Vursto, T.A. Mantyla, High temperature corrosion of coatings and boiler steels in reducing chlorine-containing atmosphere, Surface &Coatings Technology 161 (2002) 275-285.
• 4. L. Xuefeng, Corrosion behaviours of two nickel base coatings in H2S containing environments, Surface &Coatings Technology 183 (2004) 212-215.
• 5. K. Yamada et al., Hot corrosion behaviour of boiler tube materials in refuse incineration environment, Vaccum 65 (2002) 533-540.