Abstract
Pure iron specimens were implanted with doses of 5 × 1014 and 2 × 1015 tantalum ions/mm2. Using a three sweep potentiokinetic polarization technique the corrosion behaviour of these surface alloy layers was compared with that of pure iron and of a conventional Fe-4.9 wt% Cr alloy. It was found that tantalum implantation improved the corrosion resistance of pure iron and in particular reduced both the critical current density for passivation and the passive current density. The corrosion resistance of tantalum implanted iron was similar to that of the conventional Fe-4.9 wt% Cr alloy. The beneficial effects of tantalum implantation were unexpectedly persistent.
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