Szczegóły publikacji
Opis bibliograficzny
The hybrid coatings against hot corrosion: on-site and laboratory tests on P91 and carbon steels / M. DANIELEWSKI, R. GAJERSKI, R. FILIPEK, S. ŁABUŚ, E. TYLISZCZAK-HALIBOŻEK, A. MILEWSKA // W: BALTICA VII : life management and maintenance for power plants : Helsinki–Stockholm–Helsinki 12–14 June, 2007, Vol. 2 / eds. Juha Veivo, Pertti Auerkari. — Finland : VTT, 2007. — (VTT Symposium ; ISSN 0357-9387 ; 247). — ISBN: 978-951-38-6317-3. — S. 98–108. — Bibliogr. s. 107–108, Abstr.
Autorzy (6)
Dane bibliometryczne
| ID BaDAP | 39215 |
|---|---|
| Data dodania do BaDAP | 2008-06-12 |
| Rok publikacji | 2007 |
| Typ publikacji | materiały konferencyjne (aut.) |
| Otwarty dostęp |  |
| Czasopismo/seria | VTT Symposium |
Abstract
HybridMD is a mono- or multi-layer protective coating developed to extend the lifetime of boiler water walls and other equipment exposed to hot corrosion. The coating consists of the base layer(s) (30-80 mu m thick) and the top layer(s) (25-60 mu m). The base layer - HybridMDP consists of inorganic bonding agents and Al filler. The top layer - HybridMDN contains spherical and/or flake Al, Si and/or Al-Si fillers. The bonding is a mixture of organic resins. This coating was applied over sand blasted substrate of 16M and P91 steels. Prepared coupons of 16M and P91 steels were oxidized at 550 degrees C and 620 degrees C in air and to determine their oxidation behaviour. The results obtained for 16M steel at temperature 550 degrees C show that coating provides active chemical and passive mechanical protection of the outer metal surface. It limits corrosive atmosphere access to the base metal, provides reduced rate of the oxides fori-nation and reduces stresses in the growing oxide scale. The measured parabolic rate constants are in agreement with whose predicted on the base Wagner theory. The results allow to explain an exceptional hot corrosion resistance of the HybridMD coating in coal fired boilers. At 620 degrees C aluminium from coating reacts with P91 steel components, mainly iron, and forms intermetallic phases at the coating vertical bar steel interface. This aluminization process increases the hot corrosion resistance. The further tests are necessary to study the long time evolution of the diffusion zone and the effect of water vapour on P91 oxidation rate.