ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY OF 3 MEV NICKEL IMPLANTED INTOSTEEL

Impedance spectroscopy was used to study the corrosion of a nickel imp lanted steel sample. The dosage was 5 x 10(15) ions/cm(2) and the ener gy of the nickel ions was 3 MeV. The data from a Simple Randles circui t (R(p) and C-d1) were used tp explain the corrosion changes observed in a NACE (National Association of Corrosion Engineers) Brine solution (used to emulate geothermal brine conditions) at pH 2.0 and 25 degree s C in an air saturated solution. Iron concentrations measured by Indu ction Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES) were used to calculate corrosion rates at various time intervals. Impedance spec troscopy(1,2) is an electrochemical technique which can be used to mon itor corrosion and to our knowledge it has not been applied to implant ed materials.