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Poster De Conférence Année : 2003

Electrochemical study of cobalt base superalloys' corrosion by a molten glass ; influence of alloy's microstructure and of the chemical composition of the glass

S Michon
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  • PersonId : 790739
  • IdRef : 115873139
P Berthod
C Rapin
R Podor
P Steinmetz
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  • PersonId : 1255517
  • IdRef : 070477876

Résumé

Superalloys are among the materials used in the hottest parts of glass making machines. These metallic alloys bring their high mechanical properties where tensile resistance and fracture toughness are of a great importance. Unlike many refractory oxide materials, superalloys are affected by both high temperature oxidation and corrosion by molte n glass, which limit their life duration. On the second point, it is possible to increase the resistance of superalloys against glass corrosion, by reaching and keeping a passive state. The aim of this paper is to characterize the behavior of cobalt base superalloys in molten glass, and to determine the influence of alloys and glass characteristics, and o f some process parameters. Thus, high chromium superalloys are generally passivable in molten glass. They can be protected against glass corrosion by an external chromia scale, the corrosion rate strongly decreasing. In some cases no precaution is required for such alloys to reach the passive state, as it was observed for a glass containing strong oxidant species (FeIII). In other glasses, the alloys need to be helped. In this field, a preliminary oxidation in air at high temperature gives them a first chromia scale and they get immediately the passive state. Minimal values of temperature and duration of this preoxidation have to be respected, depending of the alloy’s characteristics. Among these latter, it appeared that existence and types of carbides can influence the reaching easiness of the passive state and its everlastingness on long times. Finally, certain glasses do not allow chromia-former alloys to become passive, maybe because a too high solubility of chromia into the glass melt.
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hal-04062371 , version 1 (07-04-2023)

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Paternité - Pas d'utilisation commerciale - Pas de modification

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  • HAL Id : hal-04062371 , version 1

Citer

J Di Martino, S Michon, P Berthod, C Rapin, R Podor, et al.. Electrochemical study of cobalt base superalloys' corrosion by a molten glass ; influence of alloy's microstructure and of the chemical composition of the glass. 7th International Conference “Advances in Fusion and Processing of Glass”, Jun 2003, Rochester, United States. ⟨hal-04062371⟩
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