Effect of temperature on coal ash hot corrosion resistance of Inconel 740 superalloy

Aung, Naing Naing; Liu, Xingbo

doi:10.1016/j.corsci.2014.01.020

Cited by 51 publications

(15 citation statements)

References 33 publications

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“…The Ni sulphidation is observed to also proceed within the region of selective corrosion along grain boundaries (see Fig 11). The identification of sulphidation induced attack in corrosion products resulting from coal firing, as well as co-firing of straw with coal has been reported [52], and the responsible mechanism for sulphidation attack on Ni has been discussed by several authors [53][54][55][56]. For direct reaction between S and the metal, it is a requirement for the equilibrium partial pressure of S to be higher than that of the dissociation of the resulting metal sulphide.…”

Section: Discussionmentioning

confidence: 99%

High Temperature Corrosion under Laboratory Conditions Simulating Biomass-Firing: A Comprehensive Characterization of Corrosion Products

Okoro¹,

Montgomery²,

Frandsen³

et al. 2014

Energy Fuels

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An austenitic stainless steel (TP 347H FG) was coated with a synthetic deposit and exposed, under laboratory conditions simulating straw-firing at 560 °C, for 1 week. Microscopic, diffraction, and spectroscopic techniques were employed for cross-sectional and plan view “top-down” microstructural characterization of the corrosion products. The corrosion products consisted of three layers: (i) the outermost layer consists of a mixed layer of K2SO4 and Fe x O y on a partly molten layer of the initial deposit, (ii) the middle layer consists of spinel (FeCr2O4) and Fe2O3, and (iii) the innermost layer is a sponge-like Ni3S2-containing layer. At the corrosion front, Cl-rich protrusions were observed. Results indicate that selective corrosion of Fe and Cr by Cl, active oxidation, and sulfidation attack of Ni are possible corrosion mechanisms.

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Section: Discussionmentioning

confidence: 99%

High Temperature Corrosion under Laboratory Conditions Simulating Biomass-Firing: A Comprehensive Characterization of Corrosion Products

Okoro¹,

Montgomery²,

Frandsen³

et al. 2014

Energy Fuels

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“…To make matters worse, some certain salts (e.g., sulfate) will produce and deposit on the component, thereby accelerating the oxidation process. Generally, the accelerated oxidation process is called hot corrosion [1][2][3]. At a higher temperature exceeding the melting point of the salt, the molten salt would damage the oxide scale, such as Al 2 O 3 , Cr 2 O 3 , and SiO 2 , causing spallation or dissolution of the protective oxide scale [4,5].…”

Section: Please Scroll Down For Articlementioning

confidence: 99%

Influence of Nb and Y on Hot Corrosion Behavior of Ni–Cr-based Superalloys

Weng

Chen

et al. 2014

Materials and Manufacturing Processes

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The hot corrosion behaviors of new-type Ni-Cr-based superalloys were investigated at elevated temperature. The effect of Nb or/and Y on hot corrosion resistance was investigated by corrosion kinetics. Surface morphology of the corrosion products was observed by SEM and the phase constituents were analyzed by XRD. Results showed that the corrosion scales of the Ni-Cr-based alloys consisted of Cr 2 O 3 , Al 2 O 3 , TiO 2 , and NiCr 2 O 4 . NiO was only detected in the alloy without Nb and Y. With the addition of Nb or/and Y, the hot corrosion resistance of the alloy was notably improved. The action mechanisms of Nb and Y were discussed in this study.

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“…Operating temperature is one of the important factors that influence sulfidation tendency in coal ash hot corrosion of nickel-based superalloys [5]. A high sulfidation tendency can be observed at low temperatures due to the formation of low-melting alkali sulfate eutectic mixtures [5]. This is the reason why Ni-based superalloys suffer rapid degradation in the temperature range of the so-called Type II hot corrosion.…”

Section: Effect Of Temperaturementioning

confidence: 99%

“…Coal ash hot corrosion is the result of competition between oxidation and sulfidation. Sulfidation comes into picture as the materials get exposed to high-temperature combustion gases containing sulfate coal ash [5]. Superalloys, in particular, nickel-base superalloys, have been the candidate materials for application in boilers for ultra-supercritical power plants based on firing coal.…”

Section: Introductionmentioning

confidence: 99%

Hot Corrosion of Superalloys in Boilers for Ultra-Supercritical Power Plants

Muktinutalapati¹,

Natarajan²,

Arivarasu³

2018

Superalloys for Industry Applications

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The coal-based power plants have been plagued by twin problems-low thermal efficiency and emission of high level of pollutants into the environment. Over the last few decades, attention was paid by researchers worldwide to overcome these problems and to design, build, and operate coal-based plants with improving efficiency levels and reducing emission levels. Operating the power plants with higher levels of steam temperature and pressure was adopted as the direction toward achieving the needed improvements. The requirement to operate the plants with increasingly higher levels of temperature and pressure made it necessary to design the components with superalloys. Hot corrosion then becomes a major design consideration, particularly for superheaters and reheaters. Thus, it becomes important to study the hot corrosion behavior of candidate superalloys. The present chapter attempts to review the work done over the last two decades to understand the hot corrosion behavior of superalloys in the context of their use in advanced coal-based power plants.

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Effect of temperature on coal ash hot corrosion resistance of Inconel 740 superalloy

Cited by 51 publications

References 33 publications

High Temperature Corrosion under Laboratory Conditions Simulating Biomass-Firing: A Comprehensive Characterization of Corrosion Products

High Temperature Corrosion under Laboratory Conditions Simulating Biomass-Firing: A Comprehensive Characterization of Corrosion Products

Influence of Nb and Y on Hot Corrosion Behavior of Ni–Cr-based Superalloys

Hot Corrosion of Superalloys in Boilers for Ultra-Supercritical Power Plants

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