Pitting susceptibility of chromium modified passive films of a B2-FeAl intermetallic alloy

S. Frangini, J. Lascovich, N. de Cristofaro

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Abstract

The effect of chromium on the pitting corrosion resistance of an iron aluminide B2-FeAl alloy (40 at/o Al) has been evaluated in chloride borate solutions. Chromium was permanently incorporated into the passive film of FeAl by repetitive oxidation-reduction cycles from alkaline chromate solution. Although the Cr-modified passive FeAl surface was found to have a pitting behaviour comparable to that of stainless Fe-Cr steels containing Cr in the range 12-24 at/o, the XPS analysis showed that Cr enrichment within the passive film of FeAl was not as high suggesting that the protective properties of the film would be due to a synergistic effect between Cr and Al. The use of the Kirchheim model allowed to predict the ternary alloy composition in equilibrium with the Cr-modified modified passive film one.
Original languageEnglish
Pages (from-to)1041 - 1048
Number of pages8
JournalMaterials Science Forum
Volume185-188
Publication statusPublished - 1995

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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