Electrochemical noise studies of the effect of nitrogen on pitting corrosion resistance of high nitrogen austenitic stainless steels

摘要

Pitting corrosion studies were carried out on nitrogen containing stainless steels (SS) in 0.01 M FeCl_3 using Electrochemical Noise (EN) technique. Shot-noise parameters like characteristic frequency of corrosion events,f_n and characteristic charge, q and noise resistance (R_N) showed that with increase in nitrogen the tendency to undergo pitting corrosion decreases. A plot of maximum pit depth, Pit_(max)vs. nitrogen content showed that, Pit_(max)decreased with increase in nitrogen content and followed a parabolic relationship. A new parameter, charge ratio was defined; it was observed that charge ratio values decreased with increase in nitrogen content.