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Oxidation behavior of a commercial, cast Ni-base superalloy was studied in air-SO2 mixture, simulating combustion gases from high sulfur containing fuels. Experiments at 1050°C for up to 500 hours duration. The studied alloy was characterized with a number of analytical methods including SEM / EDX and GDOES after different oxidation times.
Future power generation requires gas turbines with high efficiency and fuel flexibility. The latter requirement implies that the turbine components will be exposed to more aggressive service environments. In the present work the oxidation behavior of a commercial, cast Ni-base superalloy was studied in air-SO2 mixture, simulating combustion gases originating from high sulfur containing fuels.
The experiments were performed at 1050°C for various times up to 500 hours duration. For elucidating the mechanisms of corrosion attack, the studied alloy was characterized with a number of analytical methods including SEM / EDX and GDOES after different oxidation times. In the investigated material, internal sulfidation was observed underneath the oxide scale, which led to non-protective, breakaway oxidation after extended exposure times. The corrosion resistance of the studied material in the presence of SO2 could not be explained in terms of the concentrations of the main oxide scale forming elements, Cr and Al. Apart from the latter elements, various strengthening alloying additions including Hf, C and B were found to have a profound effect on the extent of the corrosion attack. The latter element was found to be rapidly enriched in the oxide scale thereby promoting internal oxidation and sulfidation.
Key words: downloadable, Ni-base superalloys, SO2-induced corrosion, Hf, C, B
This paper presents an expanded laboratory test database on critical corrosion modes for UNS R55400 pipe exposed to relevant oilfield production environments which include sour well fluid brines, a heavy chloride/bromide brine well completion fluid, injected methanol, organic acid- and HCl-based well acidizing solutions, and seawater.
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Crevice corrosion affects the integrity of stainless steels used in oil and gas components exposed to seawater. In this work, the crevice corrosion resistance of a 22-Cr duplex and a 25-Cr super duplex stainless steels (UNS S31803 and UNS S32750, respectively) were investigated.
Lean duplex stainless steel (LDSS) can provide mechanical properties similar to that of duplex stainless steel (DSS) and is less expensive. The focus of this work was to assess the stress corrosion cracking (SCC) and SCC susceptibility of DSS and LDSS in chloride-containing sour water conditions.