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690合金的Pb致应力腐蚀行为
引用本文:刘飞华, 李成涛, 张新, 李岩, 任爱. 690合金的Pb致应力腐蚀行为[J]. 工程科学学报, 2013, 35(8): 1034-1039. DOI: 10.13374/j.issn1001-053x.2013.08.006
作者姓名:刘飞华  李成涛  张新  李岩  任爱
作者单位:1. 苏州热工研究院电站寿命管理研究中心, 苏州 215004;
基金项目:国家高技术研究发展计划资助项目(2008AA031703)
摘    要:采用反U型试样,对690合金样品在高压釜内进行了4400 h的应力腐蚀实验,以研究其在含Pb溶液中的应力腐蚀规律.利用扫描电镜和能谱仪等分析了690合金在含Pb高温高压水环境中的应力腐蚀行为.扫描电镜结果表明,690合金在测试溶液中发生穿晶型应力腐蚀开裂,裂纹内部堆积着腐蚀产物,并且Pb掺杂在其中.裂纹区域的元素面扫描表明,690合金表面生成的腐蚀产物膜内层富Cr、外层富Ni,腐蚀产物与基体膨胀系数的差异导致裂纹快速扩展.试样内外表面的腐蚀形貌差异明显,内壁呈晶格网状,外壁呈一定方向性腐蚀沟堑,主要是由于内外表面状态不同造成的.

关 键 词:镍合金  应力腐蚀开裂    腐蚀  核电站
收稿时间:2012-04-07

Lead-induced stress corrosion behavior of Alloy 690
LIU Fei-hua, LI Cheng-tao, ZHANG Xin, LI Yan, REN Ai. Lead-induced stress corrosion behavior of Alloy 690[J]. Chinese Journal of Engineering, 2013, 35(8): 1034-1039. DOI: 10.13374/j.issn1001-053x.2013.08.006
Authors:LIU Fei-hua  LI Cheng-tao  ZHANG Xin  LI Yan  REN Ai
Affiliation:1. Plant Life Management Research Center, Suzhou Nuclear Power Research Institute, Suzhou 215004, China;2. Nuclear and Radiation Safety Center, Ministry of Environmental Protection of China, Beijing 100082, China
Abstract:Reverse U type specimens of Alloy 690 were put in an autoclave to conduct the stress corrosion test for 4400 h. The stress corrosion behavior of the alloy in a high-temperature and high-pressure water solution containing Pb was studied by scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). The results show that transgranular stress corrosion cracking occurs in the alloy. Corrosion products with Pb can be found to accumulate in the crack. EDS face scanning of the crack zone indicates that the corrosion film formed in the test solution is a double-layer structure, the outer layer is rich in Ni and the inner layer is rich in Cr. The difference of expansion coefficients between corrosion products in the crack and the matrix causes a faster crack propagation. Due to different surface treatments, the inner surface and outer surface of the specimens have different corrosion morphologies, the inner surface is lattice-like, but the outer surface shows a certain direction groove. 
Keywords:nickel alloys  stress corrosion cracking  lead  corrosion  nuclear power plants
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