The Effect of Dissolved Ozone on the Corrosion Behavior of Cu-30Ni and Type 304L Stainless Steel in 0.5 N NaCl Solutions

Abstract Electrochemical experiments on the effect of dissolved ozone on the corrosion behavior of Cu-30Ni and type 304L (UNS S30403) stainless steel have been performed in 0.5 N NaCl solutions at room temperature. The experiments performed included measurements of the corrosion potential as a function of time and ozone concentrations, cyclic polarization experiments, iso-potential measurements of current densities and Auger electron spectroscopy studies of the chemical composition of the corrosion product films. The results of these experiments have shown that for both the Cu-based alloy and the stainless steel, the corrosion potential exhibits a marked shift to more noble values (∼300 mv) for ozone concentrations less the 0.2 to 0.3 mg/L. At higher ozone concentrations, the corrosion potential is virtually independent of the level of ozone dissolved in the solution. In addition to the shift in the corrosion potential, the presence of dissolved ozone resulted in a reduction in the corrosion rate for the ...