Hot corrosion behavior of Ni based Inconel 617 and Inconel 738 superalloys

El-Awadi, G. A.; Abdel‐Samad, S.; Elshazly, Ezzat S.

doi:10.1016/j.apsusc.2016.03.181

Cited by 121 publications

(47 citation statements)

References 9 publications

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“…As an oxide phase mainly Cr 2 O 3 is detected together with some unidentified phase, with possible partial fit to the Laves phase family. These constitute a broad group of Cr‐Nb‐Si intermetallics, with several diffraction peaks from Figure possibly attributable to them . The amount of the Laves phase is not influenced by the amount of Y, that supports this explanation.…”

Section: Resultssupporting

confidence: 60%

Influence of yttria surface modification on high temperature corrosion of porous Ni22Cr alloy

Karczewski

Dunst

Jasiński

et al. 2017

Int J Applied Ceramic Tech

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Protective coatings for porous alloys for high temperature use are relatively new materials. Their main drawback is high temperature corrosion. In this work protective coatings based the on Y-precursor infiltrated into the sintered Ni22Cr alloys are studied at 700°C. Effects of the amount of the protective phase on the resulting corrosion properties are evaluated in air and humidified hydrogen. Weight gain of the samples, their open porosities and microstructures are analyzed and compared. Results show, that by the addition of even a minor amount of the Y-precursor corrosion rates can be decreased by a factor of 50. K E Y W O R D S coatings, corrosion/corrosion resistance, solid oxide fuel cells, yttrium/yttrium compounds

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Section: Resultssupporting

confidence: 60%

Influence of yttria surface modification on high temperature corrosion of porous Ni22Cr alloy

Karczewski

Dunst

Jasiński

et al. 2017

Int J Applied Ceramic Tech

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“…Nevertheless, the separation of substrate curves is higher in comparison with the other ones studied, reporting highest corrosion rates. On the other hand, the corrosion rate is very low for both systems (Three-layer Painting System and Thermal Spray System), generating a protection of zinc and aluminum pigments respectively; although there is a little consumption increase of current density in 2250 hours, for both systems, fact that raises zinc and aluminum consumption, forming oxides: The above phenomena are corroborated on the SEM images, leading to lose of paint adherence and an increment of rate corrosion [27][28][29][30][31][32][33].…”

Section: Figurementioning

confidence: 92%

Corrosion protection in saline environment of a carbon steel coated (aluminum & three-layer painting system) by eats

Pérez-Muñoz¹,

Marulanda-Arévalo²,

Téllez³

2018

Rev.Fac.Ing.Univ.Antioquia

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This paper presents a comparative study on corrosion protection of low-carbon steel coated with two different painting systems. The first set of samples was coated with an aluminum layer of primer deposited by Electric Arc Thermal Spray (EATS), after which two additional layers of paint were applied, thereby creating an aluminum-painting system; while the second set of samples was coated with the traditional three-layer painting system (zinc-rich layer of primer). Afterwards, all the samples were exposed to the salt spray chamber. The samples were monitored to record their reactions in the corrosive saline environment. Scanning Electron Microscopy (SEM), adhesion and electrochemical corrosion tests were performed to characterize the coatings and report changes in their properties (adhesion, topography and homogeneity), which are related to exposure time. The three-layer painting system barely complied with manufacturer claims on protection time under corrosive conditions; on the other hand, the aluminum-painting system yielded better results by prolonging protection time. RESUMEN: Este artículo presenta un estudio comparativo de protección contra la corrosión de aceros de bajo carbono recubiertos con dos sistemas diferentes de pintura. El primer grupo de muestras fue recubierto con una capa de aluminio depositada por Rociado Térmico por Arco Eléctrico (EATS por sus siglas en inglés), subsecuentemente dos capas adicionales de pintura fueron aplicadas, creando así un sistema aluminio/pintura. Mientras que, un sistema tradicional de tres capas de pintura (primera capa de pintura rica en zinc) fue depositado en el segundo grupo de muestras. Finalmente, todas las muestras fueron expuestas en la cámara de niebla salina. Las muestras fueron monitoreadas para obtener su comportamiento en el corrosivo ambiente salino. Microscopia Electrónica de Barrido (SEM por sus siglas en inglés), ensayos de adhesión y corrosión electroquímica fueron realizadas para caracterizar los recubrimientos y reportar los cambios en sus propiedades (adhesión, topografía y homogeneidad), las cuales están relacionadas con el tiempo de exposición. El sistema de tres capas escasamente cumplió con la garantía dada por su fabricante en lo referente al tiempo de protección bajo condiciones corrosivas; por otro lado, el sistema de aluminio/pintura entregó mejores resultados al prolongar el tiempo de protección.

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“…Most of the high temperature degradation studies have been carried out in simulated environment [10][11][12][13][14][15][16][17][18][19] and very few in-situ studies on superalloys have been carried out in a medical waste incinerator. Hence the aim of present study is to evaluate the degradation behaviour of nickel-based superalloys Superni-75, Superni-750 and Superni-718 hung inside the secondary chamber of a medical waste incinerator at SKIMS Hospital, Soura, Jammu and Kashmir, India which is a tertiary care 600 bedded teaching hospital, catering to the average socioeconomic class.…”

Section: Introductionmentioning

confidence: 99%

The degradation behaviour of nickel-based superalloys in the medical waste incineration plant

Lone

Rahman

2019

Sādhanā

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The present work was aimed at analysing the oxidation behaviour of three nickel-based superalloys-Superni 718, Superni 75 and Superni 750, by conducting in-situ study in the secondary chamber of a medical waste incinerator at 800-850°C for 1000 h. It was observed that among the three superalloys, Superni 75 is best suited for such an environment. This was concluded by comparing the weight change after 100 h for total 1000 h, constituting 10 thermal cycles. The morphology of the oxide scale formed on the substrate was analysed using FE-SEM. The elemental composition was obtained by EDS. The depth profiling of the scale was done using the XPS technique. The chemical composition was also examined by the XRD analysis. The superior oxidation property of Superni 75 is due to the higher Ni-Cr content. The oxidation resistance of the nickel-based superalloys in the aggressive environment of medical waste incinerator is attributed to the presence of chromia oxide-Cr 2 O 3 and spinel NiCr 2 O 4 .

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Hot corrosion behavior of Ni based Inconel 617 and Inconel 738 superalloys

Cited by 121 publications

References 9 publications

Influence of yttria surface modification on high temperature corrosion of porous Ni22Cr alloy

Influence of yttria surface modification on high temperature corrosion of porous Ni22Cr alloy

Corrosion protection in saline environment of a carbon steel coated (aluminum & three-layer painting system) by eats

The degradation behaviour of nickel-based superalloys in the medical waste incineration plant

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