1981 Volume 30 Issue 8 Pages 450-455
The corrosion rate of carbon steel was measured in high purity water of specific conductivity less than 0.1μS/cm, at room temperature. Corrosion tests were performed at Japan Atomic Power Company, Tokai-2 Power Plant and in a loop at Hitachi Ltd., Hitachi Research Laboratory. The electrochemical measurements were done with a rotating disk electrode. The results indicated:
1) The corrosion rate decreased with specific conductivity. For example, in aerated water of specific conductivity 0.06μS/cm, the corrosion rate was 1mg/dm2·mo. 2) The corrosion rate decreased with increasing dissolved oxygen concentration in the region 10ppb to 8ppm. 3) Effect of corrosion inhibition was maintained in water at velocity higher than 0.2cm/s. Thus, prevention of water stagnation may be beneficial in reducing the corrosion rate of carbon steel, and it is very beneficial for layup of plant to recirculate demineralized water through piping. 4) From the results of corrosion potential measurements, corrosion inhibition in high purity and high oxygen content water is due to the passivation of carbon steel.
