低活化马氏体钢在ITER水环境中的腐蚀性能研究

Corrosion Property of Several Low-activity Martensitic Steels in Water Solution of ITER

  • 摘要: 低活化马氏体钢作为聚变堆候选的结构材料,其腐蚀性能影响冷却回路辐射场的分布。本文选取CLAM、CNS-1和SCRAM-9 3种钢材,并用T91与3种钢材进行对比,分析4种材料的性能。整个实验回路温度维持在150 ℃,溶氧量小于0.01 mg/kg,pH值为7(20 ℃),电导率小于1 μS/cm,压力为1 MPa,水的流速设为6 m/s。实验后,所有样品均采用失重分析法、XRD、EDS及SEM分析。结果显示,随着时间的增加,材料的失重量增加,腐蚀速率减少。4种材料的失重量均遵循幂函数规律,T91钢的耐腐蚀性较另3种钢好,而3种材料中CLAM的抗腐蚀性能相对更好;样品表面氧化层变得越来越致密且非常薄。氧化层腐蚀产物主要是Fe2O3和Fe3O4

     

    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 Fe2O3 and Fe3O4.

     

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