Corrosion Behaviour of some Fe-Base Alloys in H&lt;sub&gt;2&lt;/sub&gt;-H&lt;sub&gt;2&lt;/sub&gt;O and H&lt;sub&gt;2&lt;/sub&gt;-H&lt;sub&gt;2&lt;/sub&gt;O-HCI Gas Mixtures at 973 K

Önay, Bülent; Morimoto, Tetsuya

doi:10.4028/www.scientific.net/msf.251-254.591

Cited by 5 publications

(5 citation statements)

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“…In particular, the addition of HCl to the gas produces an increase of the thickness of the inner scale layers containing mixtures of iron-chromium spinel and iron oxides for 2.25CrMo and NF616 at both temperatures and for 12CrMoV when corroded at 773 K. This change is associated with an increase of corrosion rates with respect to those in the same atmospheres without HCl. This result agrees with the previous work by Onay et al, 19 who found that the formation of spinel (FeCr 2 O 4 ) on chromia-forming alloys in the scale was enhanced in the HCl-containing gas mixture under very low oxygen pressures, showing the existence of an adverse effect of HCl on the corrosion of alloys. The internal attack of NF616 at 873 K observed in this study is deeper than that observed in Cl-containing oxidizing atmospheres after the same corrosion time.…”

Section: Discussionsupporting

confidence: 94%

The Corrosion Behavior of Four Commercial Steels in Reducing Atmospheres Containing HCl At 773?873 K

et al. 2004

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The corrosion of four Fe-Cr commercial steels with different chromium contents in a simulated waste-gasification atmosphere containing 0.5 vol.% H 2 , 0.5 vol.% HCl, balance CO 2 has been investigated at 773 and 873 K. The same materials have also been tested in the same gas mixture free from HCl at both temperatures for comparison. The results show that the materials with low-chromium content (2.25CrMoV and NF616) undergo accelerated corrosion in the presence of HCl, while the stainless steel SS304 suffers very little corrosion. On the contrary a steel containing 12 wt.% Cr (12CrMoV) corrodes rather rapidly at 773 K but quite slowly at 873 K. The beneficial effect of chromium on the corrosion resistance of the steels increases with the chromium content at both temperatures. The steels tested show corrosion rates generally decreasing with time, having kinetics which are approximately parabolic at 773 K but intermediate between parabolic and linear at 873 K. Only little or even no chlorine can be detected at the scale/metal interface at both temperatures for all materials corroded in HCl-containing atmospheres. The corrosion mechanism can be explained by the so-called "active-oxidation" model.

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Section: Discussionsupporting

confidence: 94%

The Corrosion Behavior of Four Commercial Steels in Reducing Atmospheres Containing HCl At 773?873 K

et al. 2004

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“…The oxidation process at the oxide spots has been accelerated by the presence of HCl and this is actually the only site on any specimen where chlorine was detected. The effect of the presence of HCl in oxidising environments has been well studied and is recognised to accelerate and alter the oxidation 11 Oxide layer of 310S at corrosion spot after exposure for 960 h at 600uC in gasification environment with HCl.…”

Section: Discussionmentioning

confidence: 99%

“…However, work in the literature also reports enhanced spinel formation on 310S in the presence of HCl in a reducing hydrogen based environment. 11 The spinel phase has a lower oxygen content and is generally thought to be less protective than the M 2 O 3 phase. After exposure in the environment with HCl the oxide is thicker for both materials compared to environment without HCl.…”

Section: Discussionmentioning

confidence: 99%

“…Results are in a similar range to the work of Ö nay et al, which was performed on 310S at 700uC in a reducing environment with and without HCl. 11 The oxide layers on 15Mo3 exhibited a thickness of 50-70 mm in exposures with and without HCl. Crosssectional analysis using SEM/EDX revealed a twolayered oxide with an inner oxide displaying very small grains below an outer oxide with larger grains (Fig.…”

Section: Exposuresmentioning

confidence: 99%

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Exposure of 304L and 310S in chlorinating gasification environments

Elger

Lindberg

Norling

et al. 2015

Materials at High Temperatures

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This work examines the difference in behaviour between two austenitic steels, 304L and 310S, in a simulated environment with carbon and oxygen activities typical of the syngas cooler of a steam blown gasifier. The cyclic exposures were performed with and without addition of 500 ppm HCl for a total duration of 960 h. The oxide layers (200-600 nm) were studied using TEM, a focused ion beam microscope with EDX (FIB-EDX), electron back scattered diffraction (EBSD), SEM and X-ray diffraction (XRD). For 304L, a Cr and Ni depleted zone with a ferritic structure was observed below the oxide layer and a thin, manganese rich layer at the metal/oxide interface. For 310S, circular oxide patches were observed on the surface after exposure with HCl. These displayed elevated concentration of Al, Ca and Si, typical of inclusions. Results indicate that the addition of HCl results in a difference in oxide quality and structure but that HCl at the level of this study has little impact on the sound metal thickness.

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“…The corrosion seems enlarged without water vapor, except for the AC66 alloy. Also Cl 2 can induce the building of a new porous oxide layer [6,7,8] on the basis of active oxidation [9,10]. For the inner oxidation, chlorides probably form in the underlying zone above the oxide scale where the oxygen activity becomes very low.…”

Section: Influence Of the Atmosphere Content And Temperaturementioning

confidence: 99%

Influence of Chlorine, Sulphur and Water Vapor on High Temperature Corrosion of Fe, Cr, Ni Alloys for Waste Incinerators

Moulin

Weulersse

Favergeon

2006

MSF

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The behavior of three different materials with respect to their Fe, Cr, Ni contents have been studied between 450°C and 700°C, in waste incinerators combustion conditions, where it occurs a main influence of chlorine, sulfur and water vapor. This works analyzes the behavior of these materials which depends on their capability to form melted compounds and on the nature of these melted phases. Also as the corrosion mechanism is influenced by the presence or missing of any corrosive species, the study focalizes on the specific influence of SO2 and alkaline chorine. Effect of additive ashes on the corrosion behavior of tested materials is also studied. The mechanism of corrosion in waste incinerators is supported by thermodynamic calculations performed with the “Thermocalc” software.

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Corrosion Behaviour of some Fe-Base Alloys in H<sub>2</sub>-H<sub>2</sub>O and H<sub>2</sub>-H<sub>2</sub>O-HCI Gas Mixtures at 973 K

Cited by 5 publications

References 0 publications

The Corrosion Behavior of Four Commercial Steels in Reducing Atmospheres Containing HCl At 773?873 K

The Corrosion Behavior of Four Commercial Steels in Reducing Atmospheres Containing HCl At 773?873 K

Exposure of 304L and 310S in chlorinating gasification environments

Influence of Chlorine, Sulphur and Water Vapor on High Temperature Corrosion of Fe, Cr, Ni Alloys for Waste Incinerators

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