Abstract:
The corrosion behavior of low-activity martensite steel, a candidate structural material for fusion reactors, affects the distribution of radiation field in cooling loop. In this paper, CLAM, CNS-1 and SCRAM-9 steels were selected and compared with T91 to analyze their performance. The temperature of the whole experimental circuit was maintained at 150 ℃, the dissolved oxygen content was less than 0.01 mg/kg, the pH value was 7 (20 ℃), the conductivity was less than 1 μS/cm, the pressure was 1 MPa, and the flow rate of water was set to 6 m/s. After the experiment, all samples were analyzed by weight loss, XRD, EDS and SEM. The results indicate that as time goes on, the weight loss of the materials increases and the corrosion rate decreases. The weight loss of the four materials obeys the rule of power function. The corrosion resistance of T91 steel is better than that of the other three steels, while CLAM is better in the three materials, and the surface oxide layer of the samples becomes more and more compact and very thin. The corrosion products of the oxide layer are mainly Fe
2O
3 and Fe
3O
4.