Effect of N₂⁺ ion implantation on the electrochemical corrosion behaviour of Fe-Ni alloy in .1N H₂SO₄ solution

Abstract

A three sweep potentiokinetic technique was employed to study the electrochemical corrosion behaviour of Fe-50 at % Ni in .1N H₂SO₄ solution. The as received foil did not show any passivation but it was observed in case of Fe-Ni samples implanted with N₂ ⁺ ions at an energy of 100keV. Also it was seen that the primary passivation potential E_pp and the critical current density in the corrosion experiment decrease as the implanted nitrogen ion dose increases from 5×10¹⁵ to 1×10¹⁷ ions/cm². The identification of products formed during corrosion experiment has been attempted with the help of conversion electron Mossbauer spectroscopy (CEMS), X-ray diffraction (XRD) and X-ray photoemission spectroscopic (XPS) techniques, and the possible mechanism of reactions is discussed with reference to their results.