Effects of Silicon on High Temperature Corrosion of Fe–Cr and Fe–Cr–Ni Alloys in Carbon Dioxide

Nguyen, Thuan Dinh; Zhang, Jianqiang; Young, David J.

doi:10.1007/s11085-013-9467-y

Cited by 91 publications

(34 citation statements)

References 28 publications

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“…3, a protective chromia scale was partially developed on Fe-9Cr alloy exposed to SO 2 containing wet CO 2 gases, while little or no chromia external scale remains in sulphur free gas. Actually Cr 2 O 3 did develop at the initial stage of reaction (less than 20 min) on Fe-9Cr alloys exposing to carburising-oxidising environment (Ar-20%CO 2 gas at 818 • C) [15]. The failure of the protective scale (breakaway oxidation) could be attributed to insufficient Cr supply from the alloy to sustain Cr 2 O 3 growth, and/or stress leading to mechanical failure.…”

Section: Effect Of So 2 On Chromia Formationmentioning

confidence: 99%

“…A recent study [15] has shown that 0.2% and 0.5% Si additions dramatically improved the oxidation resistance of Fe-9Cr alloy in Ar-20%CO 2 gas at 818 • C, by forming a continuous layer of amorphous silica underneath the chromia. This provides an effective barrier to both outward diffusion of iron and chromium and inward diffusion of carbon bearing species [15].…”

Section: Effect Of Si On Chromia Formationmentioning

confidence: 99%

“…This provides an effective barrier to both outward diffusion of iron and chromium and inward diffusion of carbon bearing species [15]. A high magnification TEM image (Fig.…”

Section: Effect Of Si On Chromia Formationmentioning

confidence: 99%

“…The beneficial effect of Si additions was extensively studied by Robertson and Manning [12] for ferritic Fe-Cr alloys and by Evans et al [13] and by Francis and Jutson [14] for austenite Fe-Ni-Cr alloys in CO 2 rich gases. The role of a SiO 2 scale layer acting as a diffusion barrier for Fe- (9,20)Cr-(0.2, 0.5)Si and Fe-20Cr-20Ni-(0.2, 0.5)Si alloys in CO 2 gas has recently been reported [15]. Additions of 2% Mn significantly reduced carbon penetration and improved oxidation resistance of Fe-20Cr and Fe-20Cr-20Ni alloys in 20%CO 2 gas, due to the formation of MnCr 2 O 4 spinel scale layers, but had no benefit for the oxidation resistance of Fe-9Cr [3].…”

Section: Introductionmentioning

confidence: 99%

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Corrosion of Fe–9Cr–(Mn, Si) alloys in CO2–H2O–SO2 gases

Nguyen

Zhang

et al. 2015

Corrosion Science

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Section: Effect Of So 2 On Chromia Formationmentioning

confidence: 99%

Section: Effect Of Si On Chromia Formationmentioning

confidence: 99%

“…This provides an effective barrier to both outward diffusion of iron and chromium and inward diffusion of carbon bearing species [15]. A high magnification TEM image (Fig.…”

Section: Effect Of Si On Chromia Formationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Corrosion of Fe–9Cr–(Mn, Si) alloys in CO2–H2O–SO2 gases

Nguyen

Zhang

et al. 2015

Corrosion Science

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“…It is well known that chromia forming alloys containing sufficient silicon tend to develop silica layers beneath their chromia scales 17,18 and that the presence of manganese promotes formation of Mn-rich oxides overlying the chromia. 19 The effectiveness of these layers in resisting CO 2 attack has now been investigated.…”

Section: Preventing Carbon Crossing Chromia Layer Boundariesmentioning

confidence: 99%

Microstructures of chromia scales grown in CO₂

Nguyen

Zhang

Young

2015

Materials at High Temperatures

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Scales grown on chromia forming alloys in CO 2 are less protective than those developed during exposure to oxygen or air. Reaction with CO 2 leads to faster chromia scale growth, the more rapid onset of breakaway and internal carburisation of the alloy. Conventional and laser Raman microscopy studies of Fe-Cr alloys show that local fluctuations in scale thickness are associated with varying degrees of chromium depletion. Local conversion of Cr 2 O 3 to spinel leads to rapid outward iron diffusion and nucleation of Fe-rich oxide nodules. A TEM investigation reveals that reaction in CO 2 produces finer grained Cr 2 O 3 , inward scale growth and more rapid scaling, as well as internal carburisation. Appropriate silicon additions to the alloys lead to the formation of a thin, glassy silica layer beneath the chromia, greatly slowed chromia thickening rates and the prevention of carburisation. Atom probe tomography is used to locate carbon within the chromia.

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Degradation of ferritic stainless steels at 1200 °C in air

Cheng

Jiang

Monaghan

et al. 2017

Materials & Corrosion

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Three commercial ferritic stainless steels were investigated at 1200°C by a thermogravimetric analyser (TGA) in air. The oxidation kinetics of the ferritic stainless steels differed significantly. The adhesion of the Cr 2 O 3 scale, the morphology of the SiO 2 , with or without (Cr, Mn) 3 O 4 spinel on the top can greatly influence the oxidation and the degradation behaviour of the steels. Although the SUS430 steel had less Cr among the ferritic stainless steels (16.2 wt% Cr), it did not show more degradation behaviour than the B443NT steel (21.0 wt% Cr). The spallation of the protective oxide scale on the B443NT steel was caused by vacancy condensation at the scale/substrate interface where the SiO 2 particles were and the developed compressive stresses within the oxide scale during oxidation. (Cr, Mn) 3 O 4 spinel on the top of the Cr 2 O 3 scale on the B445J1M steel influenced its evaporation rate. The thermodynamic aspect of the chemical composition and oxidation atmosphere of the Fe-Cr-O system was also discussed.

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Effects of Silicon on High Temperature Corrosion of Fe–Cr and Fe–Cr–Ni Alloys in Carbon Dioxide

Cited by 91 publications

References 28 publications

Corrosion of Fe–9Cr–(Mn, Si) alloys in CO2–H2O–SO2 gases

Corrosion of Fe–9Cr–(Mn, Si) alloys in CO2–H2O–SO2 gases

Microstructures of chromia scales grown in CO₂

Degradation of ferritic stainless steels at 1200 °C in air

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Effects of Silicon on High Temperature Corrosion of Fe–Cr and Fe–Cr–Ni Alloys in Carbon Dioxide

Cited by 91 publications

References 28 publications

Corrosion of Fe–9Cr–(Mn, Si) alloys in CO2–H2O–SO2 gases

Corrosion of Fe–9Cr–(Mn, Si) alloys in CO2–H2O–SO2 gases

Microstructures of chromia scales grown in CO2

Degradation of ferritic stainless steels at 1200 °C in air

Contact Info

Product

Resources

About

Microstructures of chromia scales grown in CO₂