Surface alloys have been fabricated by implantation of 25 keV nickel ions into polycrystalline iron to doses ranging from . Their aqueous corrosion characteristics have been studied under conditions of anodic polarization at 30°C in a helium‐deaerated sodium borate buffered boric acid solution (pH 8.5) containing 2400 ppm chloride ion. The pitting‐ and general‐corrosion characteristics are comparable to nominally equivalent bulk commercial alloys and are superior to those of pure iron. A high strength maraging steel is shown to exhibit an increase in pittingcorrosion resistance due to the implantation of chromium ions.