摘要
针对航天结构关键材料304不锈钢的腐蚀问题,应用声发射无损检测技术对304不锈钢在极化条件下的腐蚀失效行为进行了研究;极化实验表明304不锈钢腐蚀过程主要包括点蚀孕育、点蚀发生和点蚀发展三个不同阶段,在点蚀孕育阶段和点蚀发展阶段声发射信号数量较为平稳或保持不变,而在点蚀发生阶段声发射信号数量大幅增加,声发射检测结果被SEM(扫描电子显微镜)观测结果证实;提出利用声发射腐蚀时间参数判断304不锈钢材料耐蚀性能,这为判断不锈钢材料的耐腐蚀性能提供了重要依据。
The present study was conducted on 304 stainless steel under polarization condition. Acoustic emission （AE） was used to mo nitor the corrosion evolution. According to the AE test result, the corrosion process of the sample was divided into three different stages of pitting embryonic, initiation and propagation respectively, which was confirmed by polarization curve and scanning electron microscope （SEM） result. Meanwhile the optimum parameters of AE are obtained. The results show that acoustic emission is powerful for the monito- ring of corrosion evolution.
出处
《计算机测量与控制》
北大核心
2013年第10期2770-2772,2779,共4页
Computer Measurement &Control
基金
国家重点基础研究发展计划(973计划)(2011CB610505)
关键词
声发射
304不锈钢
极化
acoustic emission
304 stainless steel
polarization
