Abstract
The role of sulfur in the passive film formation on nickel and nickel-base alloys has been extensively studied by using radiotracer and surface analysis techniques (AES and ESCA). The main conclusions are the following:
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1.
The effect of adsorbed sulfur is independent of its origin: preadsorption from gas or by surface segregation, surface enrichement by selective metal dissolution, adsorption from the electrolyte.
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2.
Sulfur increases the rate of metal dissolution in the active range of potentials.
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3.
Sulfur inhibits the formation of the passive film.
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4.
Sulfur induces the irrevėrsible breakdown of the passive film to give localized or generalized corrosion. The mechanisms of these effects are discussed.
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References
P. Marcus, N. Barbouth and J. Oudar - C.R. Acad. Sci. Paris 280 (1975) 1183.
J. Oudar and P. Marcus-Appl. Surface Sci. 3 (1979) 48.
P. Marcus, J. Oudar and I. Olefjord - Mater. Sci. Eng. 42 (1980) 191.
P. Marcus and J. Oudar in Passivity of Metals and Semiconductors, Ed. M. Froment, Elsevier (1983) 119.
P. Marcus, A. Teissier and J. Oudar - Corrosion Sci. 24, (1984) 259.
P. Marcus, I. Olefjord and J. Oudar - Corrosion Sci. 24 (1984) 269.
P. Marcus and J. Oudar in Fundamental Aspects of Corrosion Protection by Surface Modification, eds. E. Mc Cafferty, C.R. Clayton and J. Oudar, The Electrochemical Society (1984) 173.
A similar presentation of sections I to V was given by P. Marcus at an EPRI Workshop on the role of sulfur species on the degradation of alloy 600 and similar alloys, Baltimore, 17–18 october 1985. Section VI is based on chapter IV of the thesis of H. Talah, presented at the University of Paris, 5 mai 1986.
H. Talah, Thesis, University of Paris (1986) and to be published.
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© 1987 Martinus Nijhoff Publishers, Dordrecht
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Marcus, P., Oudar, J. (1987). Role of Sulfur in the Formation and the Breakdown of Passive Films. In: Latanision, R.M., Jones, R.H. (eds) Chemistry and Physics of Fracture. NATO ASI Series, vol 130. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3665-2_42
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DOI: https://doi.org/10.1007/978-94-009-3665-2_42
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