Effect of pre-oxidation on high temperature sulfidation behavior of FeCr and FeCrAl alloys

Pillis, Marina F.; Ramanathan, Lalgudi Venkataraman

doi:10.1590/s1516-14392004000100014

Cited by 17 publications

(8 citation statements)

References 10 publications

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“…After 8 h, the surface is more homogeneous with small crystallites of chromia surrounded by facetted spinel oxide grains. This morphology is similar to that already observed in previous work [12]. For both pre-oxidation durations, one can note large heterogeneities (different states of growth of oxides and/or spallation) by observing the surfaces at low magnification; this is an indication of a weakly protective oxide scale.…”

Section: Methodssupporting

confidence: 88%

High temperature alloy chloridation at 850°C

Chevalier¹,

Ched'Homme²,

Bekaddour³

et al. 2007

Materials & Corrosion

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The resistance of eight alloys against chloridation was tested at 850 C in Ar/Cl 2 (2.5% Cl 2 ) for 15 min. Pre-oxidation treatments were performed for 1 h and 8 h at 850 C in order to produce a thin, adherent and protective oxide scale able to improve the chloridation behaviour of the tested materials. The chloridised sample morphologies were compared to the morphologies observed on the non pre-oxidised samples. The alloys containing a large amount of iron did not exhibit any chloridation resistance, even after preoxidation, and were severely damaged. The nickel based alloys gave interesting results but were also attacked by chloride, probably by the "active oxidation" mechanism. The duration of the pre-oxidation treatment plays an important role, since the 8 h pre-oxidation appears more beneficial than the 1 h pre-oxidation, to delay the chloridation, probably because of the best quality of the oxide layer grown during 8 h. For the nickel based materials, the effects of chloride appear less severe than for the iron-based alloys, but are not stopped. The "active oxidation" mechanism is proposed to be responsible for the degradation of the tested materials.

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Section: Methodssupporting

confidence: 88%

High temperature alloy chloridation at 850°C

Chevalier¹,

Ched'Homme²,

Bekaddour³

et al. 2007

Materials & Corrosion

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“…preoxidation) provides an avenue for rendering protection to materials under aggressive conditions. This approach has been widely investigated under sulphidation conditions [20][21][22][23][24], and in a few cases, under conditions related to biomass firing [25][26][27][28][29]. With respect to investigations related to biomass firing, the effect of preoxidation for protection against corrosion depends on the composition and crystallography of the preoxidized layer, preoxidation conditions, as well as the corrosive environment [29].…”

Section: Introductionmentioning

confidence: 99%

Influence of preoxidation on high temperature corrosion of a Ni-based alloy under conditions relevant to biomass firing

Okoro

Montgomery

Frandsen

et al. 2017

Surface and Coatings Technology

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Development of corrosion resistant materials in biomass fired power plants demands specific attention since the condensation of deposits rich in KCl on heat exchanger surfaces induces severe corrosion attack, which is different from corrosion in traditional coal fired plants. Therefore, the ability of preoxidized layers formed on a commercial Cr-Ti-Al-containing Ni-based alloy (Nimonic 80A) to withstand biomass-induced corrosion was investigated. Preoxidation treatments at 900 o C in O2 and O2 + 10 vol % H2O, respectively, were conducted before samples were exposed to conditions that mimicked biomass firing. Complementary characterization methods were employed to study samples after preoxidation as well as after corrosion exposure. The oxides obtained by the preoxidation treatments protected the alloy during corrosion exposure at 560 o C for a period of 168 h. In contrast, non-preoxidized samples suffered corrosion attack and formed porous non-protective oxides containing the alloying elements, Ni, Cr, Ti and Al. The influence of the preoxidation layers on the corrosion mechanism is discussed.

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“…It is worth noting that these layers are not entirely protective in the sulphur-oxygen atmospheres. In these sulphur atmospheres and in combustion gases, that contain low amounts of sulphur, the materials exposed to high temperatures undergo very rapid degradation, followed by failure of the devices made of these materials [10][11][12]. It should be noted that the the degradation rate is higher in the gases containing sulphur than in oxygen environments.…”

Section: Introductionmentioning

confidence: 99%

“…Sulphides and metal oxides occur because of the reaction between metal and products of SO 2 dissociation. Therefore, the reaction products are stable and depend on the process conditions and on particular oxygen and sulphur partial pressures in the gas phase [12][13]15]. However, sulphides could be stable because sulphur partial pressure is higher than the equilibrium sulphur pressure [13].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Chemical Composition of Fe-Cr Alloy Tempered in High Temperature and Atmosphere Containing Ar-SO2

Radziszewska¹,

Kranzmann²,

Dörfel³

et al. 2016

Archives of Metallurgy and Materials

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MIcrostructure and cheMIcal coMposItIon of fe-cr alloy teMpered In hIgh teMperature and atMosphere contaInIng ar-so2The paper presents the microstructure, chemical and phase composition of thin scale, obtained as a result of hightemperature corrosion of X20Cr13 stainless steel. Samples were exposed to gas atmosphere of the following composition: 0.25 vol.% of SO2 and 99.75 vol.% of Ar at 600 °C for 5 h. As a consequence, thin compact scale was formed on steel surface. This scale consisted of three different zones. An amorphous zone was formed close to steel surface. Then, nanocrystalline zone could be observed. Finally, larger grains were formed during the corrosion process. The analysis of the chemical composition revealed higher concentration of chromium near steel surface. In contrast, to chromium, the content of iron, increased near the scale surface. It was found out that the (Cr, Mn, Fe)5O12 phase appeared in the thin scale.

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Effect of pre-oxidation on high temperature sulfidation behavior of FeCr and FeCrAl alloys

Cited by 17 publications

References 10 publications

High temperature alloy chloridation at 850°C

High temperature alloy chloridation at 850°C

Influence of preoxidation on high temperature corrosion of a Ni-based alloy under conditions relevant to biomass firing

Microstructure and Chemical Composition of Fe-Cr Alloy Tempered in High Temperature and Atmosphere Containing Ar-SO2

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