(1. 苏州热工研究院 寿命管理技术中心，苏州 215004；
2. 北京科技大学 新材料技术研究院，北京 100083)
摘 要: 将690合金样品在高压釜内进行4400 h含高温高压水腐蚀试验，采用扫描电子显微镜(SEM)、X射线衍射分析(XRD)、俄歇电子能谱(AES)和拉曼光谱(Raman)等研究690合金在含Pb高温高压水中形成的腐蚀产物膜，研究690合金在含Pb溶液中腐蚀产物膜的生长规模。结果表明：690合金在晶界处腐蚀较快，腐蚀形貌呈晶格网状；腐蚀产物膜中含有Pb，呈外层富镍内层富铬的双层结构；腐蚀产物膜主要由Cr2O3、NiFe2O4、NiO等氧化物和Ni2Cr相组成；Pb掺杂于腐蚀产物膜，降低了腐蚀产物膜的保护性，增加了690合金的腐蚀速度。
关键字: 690合金；高温高压；铅；腐蚀产物膜
（1. Life Management Technology Center, Suzhou Nuclear Power Research Institute, Suzhou 215004, China;
2. Advanced Material and Technology Institute, University of Science and Technology Beijing, Beijing 100083, China）
Abstract:Alloy 690 were put in autoclave to carry out corrosion test in high temperature and high pressure water containing Pb for 4400 h to study the corrosion film growth rule of alloy 690 in the solution containing Pb. The corrosion production film of alloy 690 in high temperature and high pressure water containing Pb was investigated by SEM, XRD, AES and Raman technique. The results show that the corrosion morphology is grain grid for the high corrosion rate of grain boundaries. The corrosion production film is the double layer, the outer layer is rich in Ni and the inner layer is rich in Cr. The corrosion production film is consisted of Cr2O3, NiFe2O4, NiO and other oxides. The new phase of Ni2Cr is found in the passive film formed in Pb-containing solution. Pb in the surface corrosion product leads to the decrease of protectiveness of the passive film and increase of stress corrosion sensitivity.
Key words: alloy 690; high temperature; high pressure; lead; corrosion production film
