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Influence of PbCl2 and KCl salt mixture on high temperature corrosion of alloy 625
RISE Research Institutes of Sweden, Materials and Production, Corrosion.ORCID iD: 0000-0001-6256-7123
RISE Research Institutes of Sweden, Materials and Production, Corrosion.
Valmet Technologies Oy, Finland.
Aalto University, Finland.
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2024 (English)In: Fuel, ISSN 0016-2361, E-ISSN 1873-7153, Vol. 358, article id 130196Article in journal (Refereed) Published
Abstract [en]

Aggressive corrosion can occur when firing waste or bio-based fuels, due to the presence of high concentrations of heavy metals, alkali metals, and chlorides. These deleterious compounds deposit on furnace walls and can form mixtures that can rapidly accelerate corrosion. The effect of salts containing lead had not been studied extensively at temperatures lower than 400 °C in nickel-based materials. This study investigates the effect of the individual salts PbCl2 and KCl and their mixture on the high temperature corrosion of alloy 625 at 340 °C and 380 °C. Samples of alloy 625 were covered with individual salts or a salt mixture and exposed to high temperatures in an atmosphere of synthetic air, 20-vol% H2O, and 100 ppm HCl. The results show that the presence of individual salts does not induce observable corrosion attack on alloy 625 after 168 h at any tested temperature. The salt mixture did cause a severe corrosion attack at 380 °C, observed after 24 h of exposure. It is suggested that the salt mixture induces the formation of lead chromates that may prevent or disrupt the formation of a protective chromia scale. It is believed that a key part of the mechanism is the formation of eutectic melts by the interaction of the scale with the salt mixture. Thermodynamic equilibria calculations show that the first melting temperature of PbCl2 and KCl salt mixture after reaction with oxygen can be as low as about 382 °C, and even lower (357 °C) if chromates are present. 

Place, publisher, year, edition, pages
Elsevier Ltd , 2024. Vol. 358, article id 130196
Keywords [en]
Atmospheric temperature; Chromates; Heavy metals; High temperature corrosion; Potash; Potassium chloride; Salt deposits; Salts; Alkali chlorides; Alloy 625; Biobased fuels; Corrosion attack; Furnace walls; High temperature corrosions; Potassium chloride; Salt mixtures; Salt-containing; Waste to energy; Lead compounds
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-67886DOI: 10.1016/j.fuel.2023.130196Scopus ID: 2-s2.0-85175489008OAI: oai:DiVA.org:ri-67886DiVA, id: diva2:1815623
Note

This work was carried out within and funded by the High Temperature Corrosion Centre (HTC) at Chalmers University of Technology, with support from the Swedish Energy Agency.

 

Available from: 2023-11-29 Created: 2023-11-29 Last updated: 2023-12-04Bibliographically approved

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Moya Nunez, AliceNorling, Rikard

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