Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12666/877
Title: Comparison between pilot and lab scale testing of aluminide coated and uncoated ferritic steels under oxy-fuel and coal/thistle co-firing conditions
Authors: Gutiérrez, M.
Illana, Andrea
Bahillo, Alberto
Benito, Manuel J.
García Martín, G.
Pérez Trujillo, Francisco Javier
Agüero, A.
Keywords: High temperature corrosion;Oxy fuel combustion;Biomass;Co-firing;Slurry coating;Pilot plant testing
Issue Date: 25-Nov-2022
Publisher: Elsevier
DOI: 10.1016/j.surfcoat.2022.128982
Published version: https://www.sciencedirect.com/science/article/pii/S0257897222009033
Citation: Surface and Coatings Technology 450: 128982(2022)
Abstract: The present study compares the biomass corrosion behavior of two diffusion aluminide coating obtained by slurry application, which were deposited on two low-chromium content steels, ferritic-martensitic P92 (8.7 wt% Cr) and ferritic T22 (2 wt% Cr). Their performance degradation was conducted under an oxy-fuel combustion environment for both coated and uncoated materials both under laboratory conditions and in a pilot plant burning thistle for 500 h. Exposures were carried out in the laboratory at two different temperatures, 600 °C and 650 °C, under a model atmosphere consisting of 60 % CO2, 30 % H2O, 8 % O2, bal.% N2 (in vol%), 500 vppm HCl and 2 vppm SO2. The pilot plant used a mixed fuel of 60 wt% coal and 40 wt% thistle that was burnt and the samples were exposed to a temperature range of 600–620 °C. After testing, the results revealed that the aluminide-coated materials exhibited a very high resistance under both extreme scenarios, with a variable protective character related to their Al content. On the contrary, uncoated material exhibited severe degradation, in particular T22. Microstructural and morphological studies showed up similar corrosion patterns and products on coated and uncoated materials for both testing environments.
Description: Highlights. A laboratory scale biomass corrosion testing procedure was validated by pilot plant testing using thistle. Two slurry aluminide coatings demonstrated biomass corrosion protection of ferritic steels Slurry with the higher Al content was the better, exhibiting little degradation after 500 h of exposure up to 650° C.
URI: http://hdl.handle.net/20.500.12666/877
ISSN: 0257-8972
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