Evaluation of the Compatibility of Aluminide Coatings in High-Temperature Sodium for Fast Reactor Application

Rouillard, Fabien; Courouau, Jean-Louis; Duprey, Brigitte; Mathieu, Sandrine; Vilasi, Michel; Bouizi, Younès; Boissonnet, Germain; Pedraza, F.; Proriol-Serre, Ingrid

doi:10.1007/s11085-016-9689-x

Cited by 7 publications

(5 citation statements)

References 7 publications

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“…Marcus even described Mo as a "dissolution moderator" due to its high metal-metal bond energy compared to Cr as a "passivity promoter", which has a combined high metal--oxygen bond strength and low metal-metal bond energy [41]. However, according to Breslin et al, molybdates can react with Al in acidic media according to equations (4) Therefore, the alumina would be rather in a hydrated state, which in our case is clearly an oxyhydroxide close to -AlOOH and Mo would appear as both the metal (reaction (4)) and the oxidized state (reactions (5) and (6)). Here, the anodic polarization seems thus to oxidize further Mo +3 and Mo +4…”

Section: 2-dissolution and Passivationmentioning

confidence: 91%

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Dissolution and passivation of aluminide coatings on model and Ni-based superalloy

Guével

Grégoire

Cristóbal

et al. 2019

Surface and Coatings Technology

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Electrolytic dissolution of aluminide coatings on model (pure Ni, Ni20Cr) and René 125 Ni-based superalloy was conducted by alternated cathodic and anodic polarizations. The pure nickel aluminide dissolved homogeneously. In contrast, the inhomogeneity of dissolution increased with the incorporation of Cr in the coating. The coatings were however uniformly dissolved when the cathodic step was eliminated. XPS and TEM demonstrate that the occurrence of a passive layer containing Cr and Al oxy-hydroxides blocked dissolution.

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Section: 2-dissolution and Passivationmentioning

confidence: 91%

“…(MoO2) of reactions (5) and (6) into Mo +6 oxidation state. Indeed, the Pourbaix diagram of Mo shows that the molybdates decompose in acidic media to result in molybdic acids upon the anodic polarization (0.5 V/SCE) at pH 0 and in metal Mo upon the cathodic polarization (-0.8V/SCE) [34].…”

Section: 2-dissolution and Passivationmentioning

confidence: 99%

Dissolution and passivation of aluminide coatings on model and Ni-based superalloy

Guével

Grégoire

Cristóbal

et al. 2019

Surface and Coatings Technology

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“…The corrosion tests were performed in a static sodium device [33,[39][40][41]. The stainless steel samples are immersed in sodium (approximately 2.3 kg), contained in a molybdenum crucible.…”

Section: Corrosion Test Devicementioning

confidence: 99%

Further insights into the mechanisms involved in the corrosion of 316L(N) austenitic steel in oxygenated liquid sodium at 550 °C

et al. 2020

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316L(N) austenitic steel was corroded at 550 °C in liquid sodium containing ca. 200 µg g-1 dissolved oxygen from 242 h to 7704 h. NaCrO2 is formed for all immersion times, O and Na from liquid metal and Cr from steel. The oxidation front is located at the chromite / steel interface and in the steel grain boundaries. M6C carbides (M = Mo and Fe) are also formed, C from liquid sodium. NaCrO2 is dissolved until the saturation of liquid sodium in Cr is reached. The Cr solubility is higher than that of pure Cr due to the presence of dissolved oxygen.

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“…Aluminizing of steel products allows to significantly increase their technological properties, such as corrosion resistance, wear resistance and heat resistance [1][2][3][4][5][6][7]. The aluminized steel is widely used in such applications as automotive exhaust system parts, containers for chemical thermal treatment, construction material for concentrating solar power systems etc [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Influence of Thermal Exposure on the Structure and Phase Composition of Aluminized Layer Obtained by Explosion Welding and Hot-Dipping Process

Шморгун

Pronichev

Kulevich

2019

MSF

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It is shown that for the formation of Fe2Al5 intermetallic coatings on the steel surface the aluminized layer obtained by explosion welding must be subjected to a double heat treatment (660 °C, 3 h + 640 °C, 3 h). The first heat treatment ensures the necessary size of the diffusion zone, and the second leads to the formation of a main crack at the interface of Fe2Al5 and FeAl3 intermetallides, which allows to separate the unreacted layer of aluminum and form a coating with hardness of 10 GPa. To form Fe2Al5 intermetallic coating on the steel surface, the aluminized layer, which is immersed in the melt, must be heat treated at 800 °C. The alloying of the diffusion zone by Si and Cu with the replacement of aluminum by the AK12M2 alloy leads to a decrease in the thickness of the diffusion zone and the appearance of additional phases of Al7Fe2Si and (Al,Si)5Fe3 in its composition. The duration of the subsequent heat treatment at 800 °C for complete dissolution of the surface layer increases the hardness of the resulting coating on the basis of a solid solution of Si in Fe2Al5 is 7.5-8 GPa.

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Evaluation of the Compatibility of Aluminide Coatings in High-Temperature Sodium for Fast Reactor Application

Cited by 7 publications

References 7 publications

Dissolution and passivation of aluminide coatings on model and Ni-based superalloy

Dissolution and passivation of aluminide coatings on model and Ni-based superalloy

Further insights into the mechanisms involved in the corrosion of 316L(N) austenitic steel in oxygenated liquid sodium at 550 °C

Influence of Thermal Exposure on the Structure and Phase Composition of Aluminized Layer Obtained by Explosion Welding and Hot-Dipping Process

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Evaluation of the Compatibility of Aluminide Coatings in High-Temperature Sodium for Fast Reactor Application

Cited by 7 publications

References 7 publications

Dissolution and passivation of aluminide coatings on model and Ni-based superalloy

Dissolution and passivation of aluminide coatings on model and Ni-based superalloy

Further insights into the mechanisms involved in the corrosion of 316L(N) austenitic steel in oxygenated liquid sodium at 550 °C

Influence of Thermal Exposure on the Structure and Phase Composition of Aluminized Layer Obtained by Explosion Welding and Hot-Dipping Process

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Further insights into the mechanisms involved in the corrosion of 316L(N) austenitic steel in oxygenated liquid sodium at 550 °C