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Corrosion of carbon steel underneath a lead/potassium chloride salt mixture
Swerim AB, Sweden.
Valmet Technologies Oy, Finland.
RISE - Research Institutes of Sweden, Materials and Production, KIMAB.ORCID iD: 0000-0002-2339-9443
Valmet Technologies Oy, Finland.
2019 (English)In: Materials and corrosion - Werkstoffe und Korrosion, ISSN 0947-5117, E-ISSN 1521-4176, Vol. 70, no 8, p. 1450-1460Article in journal (Refereed) Published
Abstract [en]

High amounts of lead in waste/recycled wood fuel are known to be a contributing factor to the increased corrosion often related to this type of fuel. In combination with potassium, usually present in the fuel, low-melting point salt mixtures between lead chloride (PbCl 2) and potassium chloride (KCl) are expected to form. The purpose of this study is to investigate reactions in the mixed salt of PbCl 2 and KCl and its interactions with carbon steel P265GH and its oxide. Laboratory exposures were performed in an isothermal tube furnace with a salt mixture of PbCl 2/KCl (50/50 mol%) put on steel samples. The test duration was 24 hr at either 300°C or 340°C in an atmosphere of 100 ppm HCl and 20 vol% H 2O in synthetic air. After exposure, the salt mixture consists of distinct areas of KCl and PbCl 2 but also the compounds K 2PbCl 4 and KPb 2Cl 5. A general observation is that the oxide thickness increases with temperature and that areas with Pb/K-mixed salt are frequently found in close connection to more corroded areas. Often the more lead-rich phase KPb 2Cl 5 is located closest to the corrosion product indicating its importance for the corrosion.

Place, publisher, year, edition, pages
Wiley-VCH Verlag , 2019. Vol. 70, no 8, p. 1450-1460
Keywords [en]
carbon steel, corrosion, deposit, lead chloride, potassium chloride, salt melt, waste wood
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-39728DOI: 10.1002/maco.201810650Scopus ID: 2-s2.0-85069960772OAI: oai:DiVA.org:ri-39728DiVA, id: diva2:1341950
Available from: 2019-08-12 Created: 2019-08-12 Last updated: 2019-08-12Bibliographically approved

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Norling, Rikard

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