摘要
采用光学显微镜对AF1410电子束焊接接头的组织结构进行了分析,并采用中性盐雾腐蚀失重和电化学测试方法研究了焊缝熔合区和基体耐腐蚀性能及电化学行为.结果表明:电子束焊接后的焊缝位置为粗大回火马氏体和析出碳化物;基体的腐蚀失重较焊缝熔合区低.电化学测试表明,焊缝熔合区的开路电位低于基体,腐蚀电流高于基材,阻抗值也较低,易腐蚀,这是回火马氏体与析出的碳化物间存在电位差而导致的电化学反应,使材料在腐蚀介质中腐蚀失效.
Optical microscopy was used to analyze the microstructures of AF1410 steel welded joints after being electron beam welded.The corrosion resistant performance and the electrochemical behavior of the melting area and the base metal were also analyzed using the neutral salt spray corrosion weight loss and electrochemical testing methods.The results show that there are the thick tempered martensite and the precipitated carbides on the electron beam welding seam,and the corrosion weight of the base metal is less than that of the melting area.Electrochemical testing results indicate that the open circuit potential of the melting area is lower,the corrosion current is higher and the impedance is also lower than that of the base metal,and the melting area is more susceptible to corrosion.This is due to the electrochemical reaction driven by the potential difference between the tempered martensite and the carbide precipitation,which causes the corrosion failure of the material in the corrosion medium.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2010年第11期1447-1452,共6页
Journal of University of Science and Technology Beijing
基金
国家自然科学基金资助项目(No.51001007)
关键词
高强钢
电子束焊
电化学性能
电化学阻抗谱
极化曲线
high strength steel
electron beam welding
electrochemical properties
electrochemical impedance spectroscopy
polarization curves
