An XPS study of the passivity of a series of iron—chromium alloys in sulphuric acid*,

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Abstract

The composition and structure of passive films formed on a series of iron—chromium alloys in de-aerated 1M H2SO4 were quantitatively studied by XPS. The chromium content of passive film increased drastically at ca. 13 %Cr of the bulk alloy composition, whereas no composition change was found in the surface of the substrate alloy immediately under the passive film. The high corrosion resistance of iron—chromium alloys with high chromium content is attributed to the protective nature of hydrated chromium oxy-hydroxide, which is the main constituent of passive films on the alloys containing chromium of 12.5 at. % or more.

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*

Manuscript received 9 June 1976; in revised form 29 October 1976.

This paper was partly presented at the Japan—U.S.A. Seminar on Passivity and Its Breakdown on Iron and Iron Base Alloys, March 1975, Honolulu.

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