Abstract
The generation and topography of interference films on stainless steel in a mixture of chromic and sulfuric acids have been studied by electrochemical and scanning tunneling microscopic (STM) methods. The psychometric chroma coordinates of the colored film were determined as a function of the extent of anodic polarization, and the results indicated that red and green were susceptible to the change in potential. In other words, it is very difficult to reproduce a desired color in a wide range by the chemical coloration. Using the electrochemical method, however, any color can be always reproduced by regulating the extent of anodic polarization, and the coloration could be suspended at any stage if the colored specimen was polarized to more negative potential. The STM measurement disclosed that the interference film on stainless steel consists of small crystallites (5–10 nm in diameter) and pores (about 5 nm) and is uniform for the most part.
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