空蚀对镍基Inconel600合金钝化膜电化学性能影响

项目名称： 空蚀对镍基Inconel600合金钝化膜电化学性能影响

项目编号： No.51305228

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 机械、仪表工业

项目作者： 李党国

作者单位： 清华大学

项目金额： 26万元

中文摘要： 利用电化学工作站和旋转圆盘研究镍基合金Inconel600在氯化钠溶液和自来水介质中空蚀对其表面钝化膜电化学性能影响，通过空蚀前后和空蚀过程中钝化膜电化学阻抗谱(EIS)、Mott-Schottky曲线以及光电流响应曲线等测试获得膜内点缺陷浓度、平带电位、费米能级以及膜内电场强度等有关物理参数的变化规律；借助于X射线光电子能谱(XPS)、俄歇能谱(AES)、原子力显微镜(AFM)、扫描电镜(SEM)等分析手段获得空蚀对钝化膜微观结构和空蚀区域的微观形貌的影响机理。利用半导体表面能带理论、电化学理论以及表面分析结果分析Inconel600合金表面钝化膜电化学性能与其空蚀行为间的相互关联性。同时研究成膜条件和氯离子等外界因素对Inconel600合金空蚀性能影响，找到抗空蚀镍基合金钝化膜所对应的能带结构，利用能带结构与基体成份间的对应关系为抗空蚀镍基合金研制提供设计准则。

中文关键词： 空蚀；镍基合金；钝化膜；能带弯曲；微射流

英文摘要： The influence of cavitation erosion on the electrochemical bahavior of the passive film on nickel-based alloy Inconel 600 in NaCl solution and water was investigated using electrochemical work station and rotating disk equipment, the point defect densities, flat-band potential, Femi energy and the electric field were acquired by measuring the EIS, Mott-Schottky and the photon electron current response of the passive film after cavitation erosion or during cavitation process. The mechanism of the cavitation effect on the microstructures of the passive film and cavitation region was obtained by XPS, AES, AFM and SEM. On the basement of energy band theory, electrochemistry and surface technology, the relationship of electrochemical behaviour and cavitation erosion was discussed, the influence of film formation and chloride ions on the cavitation erosion of Inconel 600 alloy was also detected. According to the above results, the corresponded energy band of the passive film which having anti-cavitation erosion can be found, and then the design criteria of the novel nickel-based alloy which had anti-cavitation erosion can be acquired.

英文关键词： cvitation erosion；nickel-based alloy；passive films；energy band bending；micro-jet