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Evaluation of ceramic sacrificial coatings for improved alkaliinduced corrosion protection in biofuel-fired boilers
RISE, Swerea, Swerea IVF.
RISE, Swerea, Swerea IVF.
Chalmers University of Technology.
RISE, Swerea, Swerea IVF.
Show others and affiliations
2013 (English)In: NACE - International Corrosion Conference Series, 2013Conference paper, Published paper (Refereed)
Abstract [en]

In the combustion of bio-based fuels the critically exposed burner parts in small boilers are typically uncooled and are usually made of FeCrNi alloys. These materials can suffer attack from the ashes because of the formation of alkali chromate. The reaction depletes the protective oxide in chromia, leading to accelerated corrosion. Selected "acidic" ceramic coatings based on Ti, Si, B and P have been evaluated for use as sacrificial layers to prevent the initial reaction of alkali and chromium. An accelerated oxidation test method including mild thermal shock has been utilized that previously proved useful to provide application-relevant results. A comparison of coated and uncoated specimens was performed with an austenitic high temperature steel as a substrate. The results indicate that the alkali released from the ash reacts with the respective "acidic" elements in the deposited coatings. This reaction has promoted initial formation of a thin and continuous chromium-rich protective oxide sub-layer. In addition, the oxide scale formed on the coated specimens appeared more coherent and crack-free. A significant enrichment of Ni at the steel-oxide interface also occurred that can promote high temperature corrosion resistance. © 2013 by NACE International.

Place, publisher, year, edition, pages
2013.
Series
International corrosion conference series, ISSN 0361-4409
Keyword [en]
Alkali corrosion, Bio-fuel, Coatings, High temperature corrosion-resistant alloys, Pellet ash, Residential boilers, Screening, Thermal shock
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-13409Scopus ID: 2-s2.0-84883092175ISBN: 9781627481458 (print)OAI: oai:DiVA.org:ri-13409DiVA: diva2:973616
Conference
Corrosion 2013
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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Swerea IVF
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CiteExportLink to record
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Citation style
  • apa
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