The influence of reducing conditions on the sodium sulfate-induced corrosion of pure and alloyed βNiAl

Lemoine, V.; Stein, Nicolas; Roques, Bernárd P.; Duret, C.

doi:10.1016/0010-938x(85)90040-x

Cited by 11 publications

(2 citation statements)

References 4 publications

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“…For instance, if the development of a crevice continues to a depth where the oxygen partial pressure is very low (e.g., of the order of 10 -16 atm), instability of the sodium sulfate may happen. Under such conditions, a sulfur-bearing liquid phase can form which is able to dissolve Al and Ni [2]. The reducing conditions intensify with the distance from the top of a crevice and this mechanism can have a contribution to the formation of observed deep crevices in the coatings.…”

Section: Corrosion Mechanismmentioning

confidence: 97%

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Crevice Formation on the Surface of the Simple and Ti-Modified Aluminide Coatings Under a Fused Na2SO4 Salt Film

2011

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The hot-corrosion behavior of simple and Ti-modified aluminide coatings on nickel-based superalloy B-1900 was investigated. The sodium sulfate salt deposition rate was 1 mg/cm 2 for each 32 h at 900°C. Although the mass change data showed relatively more durability for the modified coatings, morphological characterization of the specimens and corrosion products revealed similar degradation mechanisms for all coatings studied. The base of a that pit developed during hot corrosion initiation had a low oxygen pressure and the pits grew perpendicular to the surface to create deep crevices. The growth and joining of these crevices caused large pieces of the coating to be lost, exposing the bare substrate to the fused salt at longer times. The initiation and advancement of the crevices are discussed and a mechanism is proposed to explain this type of hot corrosion morphology.

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Section: Corrosion Mechanismmentioning

confidence: 97%

“…Hot corrosion of b-NiAl compound either as a bulk material or as the main constituent of protective aluminide coatings has been studied extensively [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Crevice Formation on the Surface of the Simple and Ti-Modified Aluminide Coatings Under a Fused Na2SO4 Salt Film

2011

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ChemInform Abstract: THE INFLUENCE OF REDUCING CONDITIONS ON THE SODIUM SULFATE‐INDUCED CORROSION OF PURE AND ALLOYED βNIAL

Lemoine¹,

Stein²,

Roques³

1985

Chemischer Informationsdienst

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Hot corrosion behavior of Mo–9.0Si–8.0B

Beck,

König,

Case

et al. 2024

Materials & Corrosion

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In recent years, interest in Mo‐based alloys has increased significantly due to their promising high‐temperature behavior and their possible uses for industrial high‐temperature applications such as within turbines. An important corrosion mechanism in turbines is the sulfate salt‐induced attack of the structural materials, known as hot corrosion. Therefore, the Type I and II hot corrosion behavior of Mo–9.0Si–8.0B was investigated at 700°C and 900°C for 24 and 100 h. The Mo‐based alloy showed severe degradation, but not by sulfates. Thus, the underlying hot corrosion mechanism through molybdate fluxing, which is accompanied by Mo oxide evaporation, is discussed in detail. At the higher temperature, the MoO3 evaporation becomes predominant, leaving behind a Si‐glass with molybdate inclusions.

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The influence of reducing conditions on the sodium sulfate-induced corrosion of pure and alloyed βNiAl

Cited by 11 publications

References 4 publications

Crevice Formation on the Surface of the Simple and Ti-Modified Aluminide Coatings Under a Fused Na2SO4 Salt Film

Crevice Formation on the Surface of the Simple and Ti-Modified Aluminide Coatings Under a Fused Na2SO4 Salt Film

ChemInform Abstract: THE INFLUENCE OF REDUCING CONDITIONS ON THE SODIUM SULFATE‐INDUCED CORROSION OF PURE AND ALLOYED βNIAL

Hot corrosion behavior of Mo–9.0Si–8.0B

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