液相型AFM的研制与金属腐蚀原位研究

介绍了新型液相型原子力显微镜（AFM）的工作原理、系统结构和独特性能，讨论了该AFM在金属腐蚀研究中的应用。利用液相型AFM对碳钢在NaCl溶液及Pb在草酸溶液中的腐蚀过程进行了原位观察，获得了理想的扫描图像。实验结果表明，金属腐蚀最初起始于原子或纳米尺度，之后逐渐扩大到宏观尺度；金属表面的凹坑或缺陷可加速其腐蚀；而表面突起的结构则被一层层腐蚀。

AFM in Liquid and On-Spot Study of Metal Corrosion

A new type of atomic force microscope(AFM) in liquid was developed.This article briefly discusses the principle and structure of this AFM,and introduces its unique characteristic.The applications of the AFM in the research of metal corrosion are reparted in detail.By using the AFM,the corrosion processes of carbon steel in sodium chloride solution and Pb in oxalic acid could be observed and the on-spot images of the sample surface were successfully gained.The results indicate that although it often has macroscopic consequences,the metal corrosion typically begins at the atomic or near atomic level,and then it proceeds through a pitting mechanism and through an apparent step dissolution process within terraces as well as at step sites and defects.