摘要
利用统计分析和原子力显微镜(AFM)原位观测方法,研究了一种轧制粗晶的奥氏体不锈钢和它的溅射纳米晶薄膜在3.5%NaC l溶液中的点蚀行为.结果表明,溅射纳米晶薄膜的耐点蚀能力显著高于同成分的轧制粗晶材料;纳米晶薄膜的亚稳态点蚀过程被促进而稳态点蚀生长过程被抑制;电化学原子力显微镜(AFM)的原位观察可见,亚稳态点蚀在溅射薄膜表面的粒子团簇间产生,稳态点蚀为浅碟形点蚀坑生长.
The pitting corrosion behavior of a sputtered nanocrystlline thin film prepared by a rolled austenitic stainless steel has been studied in 3.5% NaCl solution by stochastic approach and atomic force microscopy（AFM）analysis.The results indicated that the pitting corrosion resistance of the nanocrystalline thin film was much higher than that of the as received steel.The stochastic results suggested that higher prevalence of metastable pits and lower rates of nucleation and growth for stable pits ocurred on the nanocrystalline thin film.The in-situ observation by AFM revealed that metastable pits preferrentially formed on the boundaries of clusters and thereby dish-shaped stable pits formed on the nanocrystalline thin film surface.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2010年第4期283-288,共6页
Corrosion Science and Protection Technology
基金
国家自然科学基金项目资助(50801063
50671113)
关键词
纳米晶薄膜
点蚀
统计分析
原子力显微镜(AFM)
nanocrystalline（NC） thin film
localized corrosion
stochastic approach
atomic force microscopy（AFM）
