摘要
采用扫描电镜、能谱、电化学阻抗谱和拉曼光谱等分析测试手段,研究了西沙群岛苛刻海洋大气环境下,经过不同时间暴露后304不锈钢的腐蚀行为和机理.304不锈钢在西沙大气暴露后的腐蚀类型主要是以局部腐蚀的点蚀为主,腐蚀产物主要由β-FeOOH、γ-Fe_2O_3和Fe_3O_4组成.随暴露时间的延长,不锈钢表面钝化膜的稳定性变差,点蚀数目增加、点蚀坑深度增大日.表面腐蚀产物覆盖率也逐渐增多.与其他部位相比,点蚀更容易在表面划痕处产生.提高表面加工精度,有助于提高其耐腐蚀性能.
The corrosion behavior and mechanism of 304 stainless steel exposed for different time periods in the marine atmosphere of Xisha islands were studied by scanning electron microscopy,energy dispersive spectra,electrochemical impedance spectroscopy,and Raman spectroscopy.Pitting corrosion is the main corrosion type of the steel in the atmospheric environment.The main compositions of the corrosion products areβ-FeOOH,γ-Fe_2O_3,and Fe_3O_4. With the exposure time prolonging,the stability of the passive film deteriorates,the pitting number and depth increase, and the coverage of the surface corrosion products also enlarges.The pitting initiates more easily at scratches on the surface.The increase in machining precision of the surface will improve the pitting corrosion resistance.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2013年第3期332-338,共7页
Journal of University of Science and Technology Beijing
基金
国家自然科学基金资助项目(51171023
51131001)
关键词
不锈钢
大气腐蚀
西沙群岛
点蚀
stainless steel
atmospheric corrosion
Xisha islands
pitting
