摘要
目前对奥氏体不锈钢在较高温度和较高流速海水中的冲蚀行为研究较少。通过失重试验和电化学测试研究了人工模拟海水中304不锈钢在不同溶液温度(30,40,60℃)和不同冲刷速度(3,5,8 m/s)下的腐蚀行为,同时利用扫描电镜(SEM)和X射线衍射仪(XRD)对冲蚀试样的表面形貌和结构进行了分析,并对冲蚀的机理进行了相应的探讨。结果表明:304不锈钢腐蚀速率随腐蚀温度和冲刷速度的增加而显著增大,其在人工海水冲蚀条件下主要腐蚀形态为点蚀、晶界腐蚀和溃疡腐蚀,试样表面钝化膜主要由Fe、Cr、Ni的氧化物构成。
The corrosion behaviors of 304 stainless steel in artificial seawater under different conditions including solution temperatures( 30 ℃,40 ℃,60 ℃) and eroding velocities( 3 m/s,5 m/s,8 m/s) were investigated by corrosion mass loss test and electrochemical test. Scanning electron microscope( SEM) and X-ray diffractometer( XRD) were employed to analyze the surface morphologies and phase structures of erosion specimen. Subsequently,the erosion mechanism was discussed. Results showed that the corrosion rates of 304 stainless steel increased obviously with the increased flow temperature and velocity. The main corrosion characteristics of 304 stainless steel were pitting corrosion,intercrystalling corrosion and ulcerative corrosion in artificial seawater. Besides,the passive film of the metal surface was mainly composed of oxides of Fe,Cr and Ni.
作者
张斌
柳秉毅
薛忠亮
仇志艳
张凤泰
缪连城
ZHANG Bin;LIU Bing-yi;XUE Zhong-liang;QIU Zhi-yan;ZHANG Feng-tai;MIU Lian-cheng(School of Materials Engineering,Nanjing Institute of Technology,Nanjing 211167,China)
出处
《材料保护》
CAS
CSCD
北大核心
2018年第11期25-28,共4页
Materials Protection
基金
江苏省大学生创新创业训练计划项目(201711276079H)资助
关键词
304不锈钢
模拟海水
温度
流速
冲刷腐蚀
304 stainless steel
artificial seawater
temperature
velocity
erosion
