Anodic Polarization Behavior of Fe‐Cr Surface Alloys Formed by Ion Implantation

Abstract

A new class of alloys has been fabricated by implantation of 25 keV chromium ions into the surface regions of iron in doses ranging from . The aqueous corrosion characteristics of these "surface alloys" have been studied under conditions of anodic polarization at 30°C in a helium‐deaerated, sodium borate‐buffered boric acid solution at a pH of 8.5 containing 2400 ppm Cl−. The active‐and passive‐region corrosion characteristics are shown to be comparable to those of nominally equivalent standard bulk alloys. In addition, the electrochemical properties of one of the Fe‐Cr surface alloys are compared with those obtained for the equivalent Fe‐Ni surface alloy, and the results are interpreted as indicating that these corrosion characteristics are not due to defect production during implantation.