Abstract
A reflectometrical video microprobe method for studying three-dimensional (3D) structures in spatially nonuniform surface films at metal/electrolyte interfaces is described. By forming microscopical video image of a probe microsite on the electrode surface and measuring the intensity distribution for reflected optical signal over the image area, one can obtain, in a real time, a three-dimensional image of the relief, thickness, and properties of islets, nuclei of a new phase, and secondary deposits over the selected area on the electrode surface. Practical considerations on developing an inexpensive PC-controlled microscopical video probe setup are given. The method is tested in a nondestructive study of microtopography of corrosion films formed on X18H10T chromic steel during its corrosion in iron chloride solution. The method is sensitive to thin films; it provides highly informative control of tangential nonuniformity of the film thickness over the studied microsite on the surface.
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