The influence of the implantation of iron ions on the corrosion of magnesium and an AlZn-rich magnesium alloy (AZ91C) has been studied. Anodic polarization measurements in a dilute chloride-containing alkaline solution were used to evaluate corrosion resistance. A range of ion energies (50-180 keV) and doses (1016-2 x 1017 Fe+ ions cm-2) have been evaluated. Both the iron-implanted pure magnesium and the alloy AZ91C gave improved polarization measurements. A systematic positive shift of the open-circuit potential with increasing iron dose was found. In AZ91C at a dose of 1017 Fe+ ions cm-2, there was a + 0.6 V more noble shift in the open-circuit potential and a nearly equivalent shift of the pitting potential. In addition, there was a reduction of more than an order of magnitude in the current densities at all potentials. The ion energy did not have a large effect on the corrosion behavior. Annealing the samples did not further improve the corrosion resistance. The results from characterizing the corroded samples using Auger spectroscopy and scanning electron microscopy are also presented. © 1985.



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01 Jan 1985

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