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X-ray absorption spectroscopy has been used to study the interaction of H(2)S at 700 C with a protective oxide layer on a Ni-20Cr alloy. Both fluorescence and electron yield detection modes, applied simultanteously, enable structural information from 100 nm and 5 nm respectively to be probed which allows the processes at the air/oxide and oxide/alloy interfaces to be monitored as a function of corrosion time. The data reveal sulphur to be in a high 6+ oxidation state in the early stages of the corrosion process, changing to 2- with the formation of a thicker sulphide-like surface film.

Additional information

Authors: CRABB T A, JRC Ispra (IT);GIBSON P N, JRC Ispra (IT);ROBERTS K J, University of Strathclyde, Department of Pure and Applied Chemistry, Glasgow (GB)
Bibliographic Reference: Paper presented: 7th International Conference on X-ray Absorption Fine Structure, Kobe (JP), August 23-29, 1992
Availability: Available from (1) as Paper EN 37286 ORA
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