The passivation of phosphorus-implanted Fe-6Cr and Fe-18Cr alloys has been investigated in 0.1 N H2SO4 with and without the addition of chloride ions. The implantation process causes a change in microstructure from crystalline to amorphous as the total P fluence increases. Implantation with 1.5×1017P/cm2 to form peak concentrations of ∼ 20 atomic percent (at%) increases the passivation rate and decreases the total charge passed during the film growth in the absence of Cl ions. When 500 ppm Cl is added to the solution, the P-implanted Fe-18Cr alloy passivates while the Fe-6Cr material pits. This behavior is explained in terms of the effect of P on Cr-containing alloys and their tendency to passivate.

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National Association of Corrosion Engineers
1987
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