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The corrosion behaviour of high manganese (19.8 – 32.5%)aluminum (7.1 – 10.2%) austenitic steels in different aqueous solutions has been examined. Potentiodynamic tests in 1 N sulphuric acid solution show high current densities either in the active or in the passive region and the formation of a thick film which separates in active/passive transition zone. Potentiodynamic tests in neutral buffer solution show a behaviour similar to that of the other ferrous alloys. Potentiodynamic tests in 1 N sodium hydroxide basic solution show a corrosion current density in the passive region related to the different manganese oxides higher than that of pure iron. The corrosion resistance of these steels is always worse than that of conventional grades austenitic stainless steels.
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Cavallini et al. (1982) studied this question.
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