Mechanisms of high-temperature corrosion in helium containing small amounts of impurities. II. Corrosion of the nickel-base alloy inconel 617

Journal article
(Original article)


Publication Details

Author(s): Christ HJ, Künecke U, Meyer K, Sockel HG
Journal: Oxidation of Metals
Publisher: Kluwer Academic Publishers-Plenum Publishers
Publication year: 1988
Volume: 30
Pages range: 27-51
ISSN: 0030-770X


Abstract

Application of the technical nickel-base alloy IN 617 in the primary
circuit of the high-temperature gas-cooled reactor is limited
essentially by the chemical reactions with the impurities (CO, CO2, H2, CH4, H2O)
in the helium coolant. The interactions of the alloy with the reactive
impurities in different helium-base gases were investigated by
thermogravimetry in a gas-tight microbalance and by simultaneous
measurement of the changes in gas composition by a continuous sensitive
mass spectrometric analysis. The results demonstrate that the set of six
reaction equations deduced in part 1 can be applied to describe the
corrosion of the alloy. The occurrence of the various reactions is
determined essentially by temperature. For the case of a standardized
helium gas (HHT-He), three temperature regions can be distinguished.
Below a critical temperature (about 1105 K), the presence of CO can
cause simultaneous oxidation and carburization. Above this temperature,
this reaction does not reverse itself. Rather, oxidation by CO2 and H2O
takes place that shows, after a transient period, the same kinetics
observed in undiluted oxygen-containing gases. At temperatures above
about 1205 K, decarburization of the alloy accompanied by the production
of CO takes place, leading to severe destruction of the carbide
microstructure and, therefore, limiting the applicability of the
material.


FAU Authors / FAU Editors

Künecke, Ulrike Dr.-Ing.
Professur für Werkstoffwissenschaften (Werkstoffe der Elektrotechnik)


How to cite

APA:
Christ, H.-J., Künecke, U., Meyer, K., & Sockel, H.-G. (1988). Mechanisms of high-temperature corrosion in helium containing small amounts of impurities. II. Corrosion of the nickel-base alloy inconel 617. Oxidation of Metals, 30, 27-51. https://dx.doi.org/10.1007/BF00656643

MLA:
Christ, Hans-Jürgen, et al. "Mechanisms of high-temperature corrosion in helium containing small amounts of impurities. II. Corrosion of the nickel-base alloy inconel 617." Oxidation of Metals 30 (1988): 27-51.

BibTeX: 

Last updated on 2019-27-02 at 13:50