A surface analytical approach to the high temperature chlorination behaviour of inconel 600 at 700 °C

Abels, J.-M.; Strehblow, Hans‐Henning

doi:10.1016/s0010-938x(96)00112-6

Cited by 70 publications

(35 citation statements)

References 20 publications

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“…The high temperature corrosion of metallic materials by chlorine has been reported in numerous investigations on Fe-Cr alloys [23,[49][50][51][52] and Ni-based alloys [53][54][55] in a similar chloridizing and oxidizing atmosphere with HCl (g) and O 2 (g). The main aggressive species in corrosion is however Cl 2 (g) (chlorine), not HCl (g), as reported by Abels et al [30], at least for short exposure times.…”

Section: Chlorine-induced Corrosion Of Stainless Steels At 700°cmentioning

confidence: 82%

Experimental and thermodynamic investigations on the chlorine-induced corrosion of HVOF thermal sprayed NiAl coatings and 304 stainless steels at 700 °C

2018

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A B S T R A C TAlumina-forming β-NiAl coatings were deposited by high velocity oxy-fuel (HVOF) thermal spraying onto 304 stainless steels for protection against chlorine induced corrosion in a biomass-fired boiler. The corrosion test was conducted in a synthetic gas containing 500 ppm HCl with 10 wt% KCl ash deposit at 700°C for 250 h. Severe corrosion was observed with the fast growing alumina at the coating/substrate interface initiating from sample edges. Possible corrosion mechanism was proposed: as supplied by HCl/KCl, the formation of volatile chlorine/chloride acted as a catalyst and promoted the growth of alumina at relatively lower application temperatures (< 900°C).

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Section: Chlorine-induced Corrosion Of Stainless Steels At 700°cmentioning

confidence: 82%

Experimental and thermodynamic investigations on the chlorine-induced corrosion of HVOF thermal sprayed NiAl coatings and 304 stainless steels at 700 °C

2018

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“…After Abels and Strehblow [15] the Cl 2 is the more reactive species in chlorine induced corrosion rather than HCl. For this reason Cl 2 is regarded as active gas component.…”

Section: Discussionmentioning

confidence: 99%

Influence of gas phase composition on the kinetics of chloride melt induced corrosion of pure iron (EU-project OPTICORR)

Ruh¹,

Spiegel

2006

Materials and Corrosion

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Heat exchanger tubes in waste-fired boilers are usually attacked by aggressive gases like oxygen, HCl and water vapour as well as by solid and molten salts. Especially if the salt deposit is molten, these compounds cause acceleration of the corrosion process. This study focuses on kinetic investigations on the influence of gas phase composition (O 2 , HCl and H 2 O) on the chloride melt induced corrosion of Fe.Thermogravimetric (TG) tests were conducted on Fe covered by a 50 mol.% KCl/50 mol.% ZnCl 2 -salt mixture at T ¼ 320 8C, first in an Ar -O 2 -atmosphere. In these experiments the amounts of salt deposit (15 and 30 mg/cm 2 ) and oxygen (4 -16 vol.%) were varied to investigate their influences on corrosion kinetics. The TG curves show three kinetic stages, i.e. an incubation phase, a linear stage and a logarithmic/parabolic stage [1]. Further it could be shown that the duration of the incubation phase and the slope of the linear stage depend on the amount of the salt deposit as well as on the oxygen partial pressure (p(O 2 )). The incubation time increases with increasing amount of salt deposit and decreases with increasing p(O 2 ).Experiments that were carried out in an Ar -O 2 -HCl atmosphere (500 -2000 vppm HCl, 4 -16 vol.% O 2 ) yield enhanced mass gain in comparison to TG tests without HCl. In atmospheres containing at least 1000 vppm HCl corrosion starts immediately without going through an incubation phase following a linear rate law. In the next stage the TG curve follows a rate law that is either parabolic or logarithmic. At higher amounts of HCl (2000 vppm, 8 vol.% O 2 ) the TG curve shows a relative mass loss after about 55 h of corrosion indicating an evaporation of iron chloride. This phenomenon was also observed at 1000 vppm HCl and 16 vol.% O 2 but not in the other experiments presented in this study.Experiments carried out in Ar -O 2 -H 2 O are discussed also. In general the TG curves show lower mass gains after some hours of corrosion in comparison to TG tests without H 2 O but at the beginning a shortened incubation phase is evident.

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“…An example of the deposits on superheater tube walls in-situ at a fluidized bed power plant in Ireland, and the corroded pipes following removal from the plant is shown in Figure 1, which has been provided by ESB. Work carried out by Abels et al 8 has shown that Cl 2 , and not HCl, is the main aggressive species in this corrosion process, at least for short exposure times; hence the initial reactions in this study are based 4 on Cl 2 . Figure 2 shows the active oxidation process as it proceeds for superheater tubes in-situ.…”

Section: Introductionmentioning

confidence: 88%

Porosity-Based Corrosion Model for Alkali Halide Ash Deposits during Biomass Co-firing

O’Hagan¹,

O’Brien²,

Griffin

et al. 2015

Energy Fuels

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Publication InformationO'Hagan, CP, O'Brien, BJ, Leen, SB, Monaghan, RFD. (2015) 'A porosity-based corrosion model for alkali halide ash deposits during biomass co-firing'. Energy & Fuels,. PublisherAmerican Chemical Society AbstractThis paper presents a physics-based model to describe accelerated corrosion due to alkali halidecontaining deposits, which form on superheater tube walls during biomass co-firing. Increased rates of corrosion during the co-firing of peat with biomass have been identified as a limiting factor on the level of biomass which is viable to use at elevated temperatures. In the present work a synthetic salt, representative of a 70:30 peat-biomass mix, has been applied to pure iron samples in air at 540 C and 600 C. The corrosion layers have been examined using scanning electron microscopy (SEM), optical microscopy and energy dispersive X-ray (EDX) spectroscopy elemental mapping to provide insight into the material degradation and structure of the corrosion layer. Two distinct types of oxide are found to form on the iron substrate. Initially, a compact, uniform oxide layer forms over the substrate. As the process continues, this oxide layer degrades, leading to spalling which sees the broken oxide pieces mix with the salt layer. Additional test samples were examined without deposits as controls to highlight the accelerated rate of corrosion. Two modelling techniques are examined; the widely-used labyrinth factor method (LFM) and the newly proposed porosity-based corrosion method (PCM). The PCM method uses measurements of porosity and pore radius, coupled with a physically-based corrosion mechanism, to predict corrosion rates. Results from the two modelling techniques are compared and both agree satisfactorily with experimental measurements for times of up to 28 days.

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A surface analytical approach to the high temperature chlorination behaviour of inconel 600 at 700 °C

Cited by 70 publications

References 20 publications

Experimental and thermodynamic investigations on the chlorine-induced corrosion of HVOF thermal sprayed NiAl coatings and 304 stainless steels at 700 °C

Experimental and thermodynamic investigations on the chlorine-induced corrosion of HVOF thermal sprayed NiAl coatings and 304 stainless steels at 700 °C

Influence of gas phase composition on the kinetics of chloride melt induced corrosion of pure iron (EU-project OPTICORR)

Porosity-Based Corrosion Model for Alkali Halide Ash Deposits during Biomass Co-firing

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A surface analytical approach to the high temperature chlorination behaviour of inconel 600 at 700 °C

Cited by 70 publications

References 20 publications

Experimental and thermodynamic investigations on the chlorine-induced corrosion of HVOF thermal sprayed NiAl coatings and 304 stainless steels at 700 °C

Experimental and thermodynamic investigations on the chlorine-induced corrosion of HVOF thermal sprayed NiAl coatings and 304 stainless steels at 700 °C

Influence of gas phase composition on the kinetics of chloride melt induced corrosion of pure iron (EU-project OPTICORR)

Porosity-Based Corrosion Model for Alkali Halide Ash Deposits during Biomass Co-firing

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About

Experimental and thermodynamic investigations on the chlorine-induced corrosion of HVOF thermal sprayed NiAl coatings and 304 stainless steels at 700 °C

Experimental and thermodynamic investigations on the chlorine-induced corrosion of HVOF thermal sprayed NiAl coatings and 304 stainless steels at 700 °C