Oxidation and hot corrosion of nickel-based alloys containing molybdenum

Peters, KA; Whittle, D. P.; Stringer, J.

doi:10.1016/0010-938x(76)90010-x

Cited by 65 publications

(16 citation statements)

References 14 publications

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“…The catastrophic attack induced by Mo in Fe-and Ni-based alloys during hot corrosion have been reported, 12 and the characteristic features of the hot corrosion of Mocontaining alloys (at least in salt-coating tests) are the catastrophic breakaway and the development of a characteristic, severe, hot corrosion morphology. 10 It is also reported that the development of a Mo-rich layer in the oxide adjacent to the metal appears to be the common factor. 10 The development of the Mo-rich layer in the scale of alloy 625 observed in the present study could have caused film breakaway.…”

Section: Corrosion Ratementioning

confidence: 99%

“…10 It is also reported that the development of a Mo-rich layer in the oxide adjacent to the metal appears to be the common factor. 10 The development of the Mo-rich layer in the scale of alloy 625 observed in the present study could have caused film breakaway. The mechanism postulated for this type of attack consists of the formation of a layer of molybdenum dioxide (MoO 2 ) at the scale-alloy interface, which is oxidized to liquid molybdenum trioxide (MoO 3 ) following cracking of the scale.…”

Section: Corrosion Ratementioning

confidence: 99%

“…It is generally accepted that increasing the Cr content in Ni-based alloys increases the resistance to hot corrosion. 10 However, Cho, et al, 11 concluded that the higher the Cr content in an alloy, the faster the corrosion rate of the alloy in molten LiCl-Li 2 O salt; therefore, a high Cr content in the alloy would not improve the corrosion resistance. Moreover, it is generally realized that Cr is not an effective element for improving corrosion resistance of Fe-based and Ni-based alloys as a result of chloride salt attack.…”

Section: Corrosion Ratementioning

confidence: 99%

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Corrosion of Nickel-Containing Alloys in Molten LiCl-KCl Medium

Shankar¹,

Kanagasundar²,

Mudali³

2013

CORROSION

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Pyrochemical reprocessing utilizing molten chloride salt has been considered one of the best options for reprocessing of spent metallic fuels of future fast breeder reactors. Materials for pyrochemical reprocessing applications should possess high-temperature strength, corrosion, and scale resistance. The present work discusses the corrosion behavior of Ni-based alloys 600 (UNS N06600), 625 (UNS N06625), and 690 (UNS N06690) and alloy 800H (UNS N08810) exposed to molten lithium chloride-potassium chloride (LiCl-KCl) eutectic salt at 673, 773, and 873 K for 2 h in the presence of air. The corrosion rates of the samples were determined and surface morphology of the exposed samples and scales were examined using scanning electron microscopy (SEM), x-ray diffraction (XRD), and laser Raman spectroscopy (LRS) . The results indicated that Ni-based alloys (UNS N06600 and UNS N06690) offer better corrosion resistance compared to Ni-based alloy (UNS N06625) and alloy 800H (UNS N08810) because the presence of Mo in Ni-based alloy (UNS N06625) is not beneficial for molten salt environment in air. Based on the surface morphology, XRD, and cross-sectional energy-dispersive x-ray (EDX) analyses of scales and exposed samples, the mechanism of corrosion of alloys appears to be from the formation of Cr-rich and Ni-rich layers of chromium(III) oxide (Cr 2 O 3 ), nickel oxide (NiO),and spinel oxides at the surface and subsequent spallation. The paper highlights the results of the present investigation. KEy wORDS: high-temperature corrosion, scanning electron microscopy, super alloys, x-ray diffraction ISSN 0010-9312 (print), 1938-159X (online) 13/000011/$5.00+$0.50/0 © 2013, NACE International CORROSION SCIENCE SECTION CORROSION-Vol. 69, No. 1 49 FIGURE 9. LRS of scales formed at 873 K/2 h on Ni-based alloys.

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Section: Corrosion Ratementioning

confidence: 99%

Section: Corrosion Ratementioning

confidence: 99%

Section: Corrosion Ratementioning

confidence: 99%

See 1 more Smart Citation

Corrosion of Nickel-Containing Alloys in Molten LiCl-KCl Medium

Shankar¹,

Kanagasundar²,

Mudali³

2013

CORROSION

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“…Therefore, more than 10 wt.% Cr along with approximately 3 wt.% Ti or more are typical for hot corrosion resistant superalloys [3][4][5]9]. W and Mo show detrimental effect on the hot corrosion resistance, because their acid oxides can accelerate the corrosion rate dramatically [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Role of tantalum in the hot corrosion of a Ni-base single crystal superalloy

et al. 2015

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“…Some metals and alloys experience accelerated oxidation when their surfaces or surfaces of their protective oxide scales are covered with a layer of molten MoO 3 , V 2 O 5 and Bi 2 O 3 (catastrophic oxidation [1][2][3][4][5][6][7]) or molten Na 2 SO 4 (hot corrosion [8][9][10][11][12][13]) in air at elevated temperatures. In catastrophic oxidation and hot corrosion, metals and alloys are subject to degradation at much higher rates than in gaseous oxidation, with a porous nonprotective oxide scale formed at their surface, and sulfides in the substrate.…”

Section: Introductionmentioning

confidence: 99%