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采用SEM,XPS,XRD和电感耦合等离子体原子发射光谱(ICP-AES)法并结合线性极化曲线研究了模拟压水堆一回路加氢水化学条件下预氧化的316LN不锈钢表面沉积贵金属Pt的方法及其对材料电化学行为的影响。结果表明,预氧化实验中,材料表面形成了双层氧化膜,外层为富Ni层,内层为富Cr层,与反应堆实际运行中材料表面产生的氧化膜结构和成分相似;在模拟热停堆实验条件下,用Na2Pt(OH)6配制含Pt量为0,10,50和100μg·kg-1的溶液能够在316LN材料表面沉积达到目标要求的Pt。电化学实验结果表明,Pt沉积量越多,材料的腐蚀电流密度变化越小,腐蚀电位急剧降低,说明材料抗腐蚀性能提高。
The deposition of precious metal Pt on 316LN stainless steel pre-oxidized under hydrothermal conditions in the first circuit of a simulated PWR was studied by means of SEM, XPS, XRD and inductively coupled plasma atomic emission spectrometry (ICP-AES) Methods and Their Effects on Electrochemical Behavior of Materials. The results show that in the pre-oxidation experiment, a double oxide film is formed on the surface of the material, the outer layer is Ni-rich layer and the inner layer is Cr-rich layer, which is similar to the structure and composition of the oxide film on the surface of the reactor during actual operation; In the shutdown condition, a solution containing 0, 10, 50 and 100 μg · kg-1 of Pt was prepared by Na2Pt (OH) 6 deposition on target 316LN surface. The results of electrochemical experiments show that the more Pt deposit, the smaller the change of corrosion current density and the sharp decrease of corrosion potential, which indicates that the corrosion resistance of the material is improved.