Anodic polarization behavior of Fe-Cr surface alloys formed by ion implantation.
Covino BS Jr.; Sartwell BD; Needham PB Jr.
J Electrochem Soc 1978 Mar; 125(3):366-369
A new class of alloys was fabricated by implantation of 25 kev chromium ions into the surface regions of iron in doses ranging from 1.0 X 1016 to 4.0 X 1016 cr atoms/cm2. The aqueous corrosion characteristics of these surface alloys was studied under conditions of anodic polarization at 30 deg c in a helium-deaerated, sodium borate-buffered boric acid solution at a ph of 8.5 Containing 2,300 ppm cl-. The active- and passive-region corrosion characteristics are shown to be comparable with 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.
Mining-industry; Mineral-processing; Metals;
Author Keywords: anodised layers; iron alloys; nickel alloys; corrosion protection; chromium alloys; ion implantation; anodic polarization; pitting potential; surface alloys; Fe-Cr
OP; Journal Article
Journal of the Electrochemical Society