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Corrosion in H2/H2S mixtures of a Ni77Cr16Fe7 alloy previously covered with an external Cr2O3 layer

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Abstract

A thermodynamic and kinetic study of sulphidization of Ni77Cr16Fe7 alloys — previously covered with a Cr2O33 layer — was made in a H2/H2S mixture, under a wide range of sulphur pressures (10−4 atm <p(H2S) < 10−1 atm) and at temperatures between 700 and 1000° C. The mechanism for sulphur penetration through the external chromium oxide and the competition between Cr2O3 reduction and CrS formation were studied with the help of thermogravimetry and analytical techniques. The essential role of chromium carbides appears to be to modify the distribution of sulphur in the structure and to lower the critical energy for sulphide formation. Two growth laws were found to apply for external layer formation, one for the industrial form of the alloy and the other for a purer synthetic form. The alteration in mechanical properties of the external sulphidized zone were used to show the initial softening effect of chromium depletion, then the hardening effect of sulphide precipitation.

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Authors and Affiliations

  1. Laboratoire de Metallurgie Physique, Université de Paris XI, LA 177, Bâtiment 413, 91405, Orsay Cedex, France

    G. Moulin, M. Aucouturier & P. Lacombe

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  1. G. Moulin
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  2. M. Aucouturier
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  3. P. Lacombe
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Moulin, G., Aucouturier, M. & Lacombe, P. Corrosion in H2/H2S mixtures of a Ni77Cr16Fe7 alloy previously covered with an external Cr2O3 layer. J Mater Sci 19, 815–837 (1984). https://doi.org/10.1007/BF00540453

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  • DOI: https://doi.org/10.1007/BF00540453

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