Journal Article

FZJ-2021-04085

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Hot corrosion of TBC‐coated components upon combustion of low‐sulfur fuels

Holländer, C. (Corresponding author) ; Kiliani, S. ; Stamm, W. ; Lüsebrink, O. ; Harders, H. ; Wessel, E.FZJ* ; Müller, M.FZJ* ; Singheiser, L.FZJ*

2021
Wiley-VCH Weinheim [u.a.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/29606  doi:10.1002/maco.202112371

Abstract: Gas turbine reliability is a crucial requirement for passenger safety in aviation and a secure energy supply. Hence, corrosive degradation of combustor parts, vanes, and blades in gas turbines must be prevented. One of the most severe forms of corrosion is alkali-sulfate-induced hot corrosion, which is associated with internal sulfidation of components and is usually anticipated to fade in importance in the absence of sulfur. However, the literature suggests that hot corrosion might still occur in low-sulfur combustion gases. In this study, established thermodynamic modeling methods are used to analyze the low-sulfur hot corrosion regime. Liquid sodium chromate is found to be stable in these conditions. A comparison of calculation results and engine findings suggests that high alkali levels can negatively impact thermal barrier coating life even if sulfur is absent in the fuel. Laboratory tests are carried out to validate the chromate formation on MCrAlY-coated specimens. It is shown that molten sodium chromate can alter the oxidation behavior of MCrAlY, promoting the formation of voluminous spinel. This represents a new and different form of hot corrosion compared to type I hot corrosion.

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Contributing Institute(s):

1. Werkstoffstruktur und -eigenschaften (IEK-2)

Research Program(s):

1. 1221 - Fundamentals and Materials (POF4-122) (POF4-122)

Appears in the scientific report 2021

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; DEAL Wiley ; Ebsco Academic Search ; Essential Science Indicators ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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