Abstract
Hot corrosion causes significant problems for both aerospace and power generation industries, where the combination of high temperature, corrosive gases, and contaminants severely limits component operating lifetimes in gas turbine hot gas streams. Multiple laboratory testing methodologies exist to study this hot corrosion, and these can be affected by a range of variables. This paper investigated the impact of varying deposit recoat cycle length when using the ‘deposit recoat’ testing method. CMSX-4 samples were exposed to simulated type II (pitting) hot corrosion conditions, with the same overall deposit load (averaged across the total exposure run), but different deposit recoat cycles. Post-exposure, samples underwent dimensional metrology analysis to compare metal loss resulting from different deposit recoat cycle lengths. Results for CMSX-4 suggest very small differences in corrosion losses, indicating CMSX-4 hot corrosion datasets obtained from deposit recoat experiments with different deposit recoat cycle lengths can be compared with confidence.
Highlights
Hot corrosion is a problem for components exposed to the hot gas path of both aerospace and power generation gas turbines
This paper investigated the impact of varying deposit recoat cycle length when using the ‘deposit recoat’ testing method
Results for CMSX-4 suggest very small differences in corrosion losses, indicating CMSX-4 hot corrosion datasets obtained from deposit recoat experiments with different deposit recoat cycle lengths can be compared with confidence
Summary
Hot corrosion is a problem for components (e.g., blades, vanes, combustor cans) exposed to the hot gas path of both aerospace and power generation gas turbines Both air and fuel contain a range of potential contaminants (sulfur, alkali metals, etc) which react in the high temperature, combusted gas stream. In such environments, corrosive deposits can condense out of the gas stream and onto the relatively cool components, where, coupled with SO2/SO3 gaseous species, fluxing of protective oxide scales can occur (hot corrosion incubation) followed by base alloy attack (hot corrosion propagation) [1]. Techniques such as Dean’s Rig rely on supersaturation of the deposit relative to the gas steam [7], while other systems periodically recoat the deposit on the sample (‘deposit recoat’ technique) [8]
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