The role of alloying elements in commercial alloys for corrosion resistance in oxidizing‐chloridizing atmospheres. Part II: Experimental investigations

Bender, Roman; Schütze, M.

doi:10.1002/maco.200303673

Cited by 48 publications

(47 citation statements)

References 15 publications

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“…The possible formation of FeCl 2 at the metal-oxide interface, its evaporation and transport as a gas across the oxide scale is the probable reason of such a be- High temperature alloy chloridation at 850 C haviour [6]. Similar results were observed at 800 C in 2 vol.% Cl 2 on iron-based materials [16]. The nickel-based materials (Inconel 625, Hastelloy S, HR 160, HR 230, HR 242) give the best results.…”

Section: Discussionsupporting

confidence: 75%

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: Discussionsupporting

confidence: 75%

High temperature alloy chloridation at 850°C

Chevalier¹,

Ched'Homme²,

Bekaddour³

et al. 2007

Materials & Corrosion

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“…A corresponding small increase in thickness of the metal oxide containing layer of the corrosion product -layer 2 ( Figure 18) also suggests that a significant proportion of the released HCl from the sulphation process (reaction 5) has contributed to corrosion. The generated HCl can dissociate into Cl2 (reaction 1) which can migrate to the corrosion front and induce chlorination of thermodynamically favourable alloying elements (reaction 7) [53][54][55][56]. Similarly, electrochemical migration of adsorbed Cl ions to the corrosion front [18,34,57] will give rise to chlorination of the most 27 favourable alloying element.…”

Section: Effect Of H2o Vapour Concentration In the Flue Gasmentioning

confidence: 99%

Effect of Water Vapor on High-Temperature Corrosion under Conditions Mimicking Biomass Firing

Okoro¹,

Montgomery²,

Frandsen³

et al. 2015

Energy Fuels

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The variable flue gas composition in biomass-fired plants, among other parameters, contributes to the complexity of high-temperature corrosion of materials. Systematic parameter studies are thus necessary to understand the underlying corrosion mechanisms. This paper investigates the effect of water (H 2 O) vapor content in the flue gas on the high-temperature corrosion of austenitic stainless steel (TP 347H FG) under laboratory conditions, to improve the understanding of corrosion mechanisms. Deposit-coated and deposit-free samples were isothermally exposed for 72 h in a synthetic flue gas atmosphere containing either 3 or 13 vol % H 2 O vapor. Comprehensive characterization of the corrosion products was carried out by the complementary use of microscopic, spectroscopic, and diffraction-based techniques. To evaluate the effect of the exposure time, results were compared to previous results with longer isothermal exposure over 168 h and indicated that the development of a Ni-rich layer as a result of selective attack was time-dependent. The increase in the water vapor decreased the measurable corrosion attack, and in addition, decreased sulfation was observed. Results from the current investigation and from previously reported findings suggest that an increase in the water vapor content will cause competitive adsorption on active sites.

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“…A recent paper claimed the negative role of Mo in mixed oxidising-chloridising environments, due to the formation of oxychlorides MoO 2 Cl 2 [38].…”

Section: Discussionmentioning

confidence: 99%

High temperature alloy chloridation at 850°C. Part I: Comparison of Ni‐based and Fe‐based alloy behaviour

Chevalier¹,

Ched'Homme

Bekaddour

et al. 2007

Materials & Corrosion

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Eight alloys were tested under Ar/Cl 2 atmosphere at 850 C for 15 min and 1 h. Their gross and net weights were evaluated together with the base metal consumption. Macroscopic and microscopic micrographs, associated with chemical analyses and X-ray diffraction gave the composition and microstructure of the corrosion products. Huge differences were observed if one compared the nickel based alloy behaviour to that of the iron based alloy. Molybdenum and tungsten could also play a role, but it was not clearly defined until now. A tentative evaluation of the best candidates will be given, according the experimental conditions of this work and the chosen criteria. A corrosion index was established after each observation and helped to classify the different material behaviour under chloridation. The Ni-based alloys possessed the best chloridation behaviour in the present conditions, followed by the Ni-based alloys containing more Cr and finally by the Fe-based materials. The chloridation behaviours were discussed according to the volatility of the chlorides species formed on the different alloys.

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The role of alloying elements in commercial alloys for corrosion resistance in oxidizing‐chloridizing atmospheres. Part II: Experimental investigations

Cited by 48 publications

References 15 publications

High temperature alloy chloridation at 850°C

High temperature alloy chloridation at 850°C

Effect of Water Vapor on High-Temperature Corrosion under Conditions Mimicking Biomass Firing

High temperature alloy chloridation at 850°C. Part I: Comparison of Ni‐based and Fe‐based alloy behaviour

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