Quantitative evaluation of general corrosion of Type 304 stainless steel in subcritical and supercritical aqueous solutions via electrochemical noise analysis

摘要

Electrochemical noise (EN) sensors have been developed to measure the corrosion rate of Type 304 stainless steel (SS) in subcritical and supercritical environments. The EN sensors Were tested in flowing aqueous solutions containing NaCl and HCl at temperatures from 150 deg. C to 390 deg. C, pressure of 25 MPa, and flow rates form 0.375 to 1.00 ml/min. The potential and coupling current noise were recorded simultaneously and the noise resistance (R_n) was calculated form the standard deviations in the potential and current records.