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核动力回路的工作介质为放射性的水冷却剂,其压力在140～160kg/cm~2之间,相应的饱和温度为335～346℃;反应堆的进出口平均温度为260～310℃;水的pH值在6～10.5之间,即可能是中性或碱性;氯离子含量为0.1～1ppm,氧含量小于0.1ppm,水中天然杂质含量为0.5～1ppm。在此封闭的核动力回路中,凡与水冷却剂相接触的材料绝大部分采用耐蚀合金和不锈钢。设计选材中,所应考虑的均匀腐蚀、应力腐蚀和接触腐蚀等,尽管其腐蚀类型与石油、化工、医药、食品等工程中所发生的大致相同,但其工程意义和影响。因素却往往很不一样。例如在考虑材
The working medium of the nuclear power circuit is a radioactive water coolant whose pressure is between 140 and 160 kg / cm2, the corresponding saturation temperature is between 335 and 346 DEG C, the average temperature of the inlet and outlet of the reactor is between 260 and 310 DEG C, pH value of 6 to 10.5, which may be neutral or alkaline; chloride ion content of 0.1 ~ 1ppm, oxygen content of less than 0.1ppm, natural impurities in water content of 0.5 ~ 1ppm. In this closed nuclear power circuit, most of the materials in contact with the coolant are corrosion-resistant alloys and stainless steel. The design selection, should be considered uniform corrosion, stress corrosion and contact corrosion, although the corrosion type and petroleum, chemical, pharmaceutical, food and other projects occurred in roughly the same, but the engineering significance and impact. The factors are often very different. For example, consider the material