Effects of exposure temperature and time on corrosion behavior of a ferritic–martensitic steel P92 in aerated supercritical water

Zhong, Xiangyu; Wu, Xi; Han, En‐Hou

doi:10.1016/j.corsci.2014.10.022

Cited by 91 publications

(49 citation statements)

References 66 publications

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“…In contrast, six additional peaks appeared on the clusters. Four of them at low wave numbers were characteristic of haematite, as previously demonstrated by different authors [35][36][37]. At higher wave numbers, the α-Al 2 O 3 signal was still present but the peak at 650 cm -1 was surrounded by two other signals which were associated with the formation of Al-Fe spinels [38].…”

Section: Influence Of a High-pressure Steam Exposure With Timesupporting

confidence: 63%

“…a., the spectrum obtained on the platelets was the same compared to that obtained after 5000 h of exposure under high pressure with the appearance of the α-Al 2 O 3 peaks. On the contrary, the signal obtained on the clusters had 4 additional peaks corresponding to Fe 2 O 3 [35][36][37]. The two peaks corresponding to the α-Al 2 O 3 (650 and 900 cm -1 ) were still observed and two less defined peaks were detected around the alumina peak at 650 cm -1 .…”

Section: Influence Of Exposure Time -300 Bar -5000 and 10000 H Of Expmentioning

confidence: 90%

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Steam oxidation of aluminide coatings under high pressure and for long exposures

2018

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B2-FeAl-based aluminide coatings were elaborated on P92 ferritic-martensitic steels by slurry. Under atmospheric pressure of steal and 650°C, a thin protective α-Al 2 O 3 oxide layer formed and was maintained until 5000 h. With increasing pressure to 300 bar, the morphology of α-Al 2 O 3 changed markedly. Iron oxide clusters started to appear at the surface of the scale after 5000 h of exposure and kept on growing till 10000 h. It appears that pressure increased the outward diffusion of Fe through the coating and through the oxide scale and fostered the propagation of the tensile cracks of the coating.

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Section: Influence Of a High-pressure Steam Exposure With Timesupporting

confidence: 63%

Section: Influence Of Exposure Time -300 Bar -5000 and 10000 H Of Expmentioning

confidence: 90%

Steam oxidation of aluminide coatings under high pressure and for long exposures

2018

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“…A desirable continuous protective oxide layer structure with limited pores may be obtained by controlling the oxygen partial pressure [9]. Various growth mechanisms of the oxide scale of 9-12% Cr F-M steels exposed to SCW were proposed by Ampornrat and Was [5], Bischoff and Motta [10], and Zhong et al [11]. The oxide films on F-M steels followed parabolic oxidation kinetics under supercritical water.…”

Section: Introductionmentioning

confidence: 99%

Estimation of Oxidation Kinetics and Oxide Scale Void Position of Ferritic-Martensitic Steels in Supercritical Water

Sun

Yan

2017

Advances in Materials Science and Engineering

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Exfoliation of oxide scales from high-temperature heating surfaces of power boilers threatened the safety of supercritical power generating units. According to available space model, the oxidation kinetics of two ferritic-martensitic steels are developed to predict in supercritical water at 400 ∘ C, 500 ∘ C, and 600 ∘ C. The iron diffusion coefficients in magnetite and Fe-Cr spinel are extrapolated from studies of Backhaus and Töpfer. According to Fe-Cr-O ternary phase diagram, oxygen partial pressure at the steel/Fe-Cr spinel oxide interface is determined. The oxygen partial pressure at the magnetite/supercritical water interface meets the equivalent oxygen partial pressure when system equilibrium has been attained. The relative error between calculated values and experimental values is analyzed and the reasons of error are suggested. The research results show that the results of simulation at 600 ∘ C are approximately close to experimental results. The iron diffusion coefficient is discontinuous in the duplex scale of two ferritic-martensitic steels. The simulation results of thicknesses of the oxide scale on tubes (T91) of final superheater of a 600 MW supercritical boiler are compared with field measurement data and calculation results by Adrian's method. The calculated void positions of oxide scales are in good agreement with a cross-sectional SEM image of the oxide layers.

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“…According to relevant standards and some studies, the mass gain curve of steel samples was applied to reflect the degree of corrosion reaction and describe the corrosion kinetics. Based on the simultaneous expression of the Arrhenius equation and the formula of corrosion weight gain, the mass gain curve can be fitted by Equation . Due to the constant temperature condition of the experiment, the Equation can be simplified to Equation :

\ln normalΔ W = \ln k_{0} - Q / italicRT + n \ln τ

normalΔ W = k τ^{n}

where Δ W is the weight gain of steel samples (mg/cm 2 ); k 0 is the rate constant (mg/cm 2 · h −n ); Q is the activation energy of corrosion reaction (J/mol); R is the gas constant; T is the temperature (K); τ is the time (h); n is the time exponent; and k is the rate constant which equals k 0 exp(− Q / RT ).…”

Section: Resultsmentioning

confidence: 99%

Experimental investigation of high‐temperature corrosion properties in simulated reducing‐sulphidizing atmospheres of the waterwall fireside in the boiler

Huang

Wang

et al. 2019

Can J Chem Eng

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The presence of reducing atmospheres of the waterwall fireside in the boiler due to extensive use of low‐NOx combustion mode caused severe high‐temperature corrosion problems. In this study, high‐temperature sulphur corrosion properties of two types of low alloyed waterwall steel (15CrMoG and 12Cr1MoVG) in two kinds of reducing‐sulphidizing atmospheres were investigated by lab‐scale experiments. The experimental atmospheres and temperature were simulated according to field measurements in the boiler of a thermal power plant. The experimental results showed that the reducing‐sulphidizing atmosphere with CO was more corrosive, and the CO accelerated the corrosion of H2S and worsened the corrosion. The CO inhibited the formation of oxide scales, provided some corrosion resistance, and produced the intensely corrosive COS. The corrosivity of the alkali metal chlorides was limited in the reducing‐sulphidizing atmosphere without CO, while the corrosion was strongly hindered in the reducing‐sulphidizing atmosphere with CO.

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Effects of exposure temperature and time on corrosion behavior of a ferritic–martensitic steel P92 in aerated supercritical water

Cited by 91 publications

References 66 publications

Steam oxidation of aluminide coatings under high pressure and for long exposures

Steam oxidation of aluminide coatings under high pressure and for long exposures

Estimation of Oxidation Kinetics and Oxide Scale Void Position of Ferritic-Martensitic Steels in Supercritical Water

Experimental investigation of high‐temperature corrosion properties in simulated reducing‐sulphidizing atmospheres of the waterwall fireside in the boiler

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