压水堆核电厂一回路首次钝化工艺研究

压水堆核电厂热态功能试验中的一回路首次钝化对核电厂一回路材料腐蚀控制和减少腐蚀产物等方面具有重要作用。本文结合理论研究与工程实际情况，提出了在热态功能试验过程中钝化膜的生成包含电化学反应和化学反应的观点，阐述了双层膜的生长机理，解释了用电化学测试方法分析钝化工艺过程的合理性，推导出钝化温度与钝化膜反应速率的函数关系式，钝化温度升高，反应速率升高，钝化时间缩短；明确了钝化工艺温度的理论限值应不低于260℃。 

Study on Initial Passivation Process of Primary Loop of PWR Nuclear Power Plants

The development of the passive oxide film on the primary loop during hot functional testing of PWR nuclear power plants is very important in the minimizing corrosion of the materials and corrosion product release.In this paper,based on the theoretical research and engineering practice,it is concluded that the electrochemical reaction and the chemical reaction exist in the formation of the passive oxide film during the hot functional testing,and the growth mechanism of the double-layer film is explained.The reasonableness of the analysis of passivation test by electrochemical measurement method is demonstrated.The functional relationship between passivation temperature and passivation film reaction rate is deduced.When the temperature increases,the reaction rate will increase and the passivation time shortens.The theoretical limit of passivation temperature should not be lower than 260℃.