The In-situ Measurement of a Local Chemical Reaction by Raman Spectroscopy : Time dependent enrichment of chloride ions on the surface of 304L stainless steel(EAC1)

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In this research, in situ microscopic Raman spectroscopy was used to measured and to analyze the local enrichment of chloride ions on the surface of 304L stainless steel in a sodium chloride solution where the potential of the sample was controlled by a potentiostat. The Raman Spectroscopy measurement was performed on the specimen under the potential control with an area of φ10μm. The local concentration of chloride ions was measured by the variation of the water Raman spectrum since the O-H stretching mode of water Raman scattering (at 3250 - 3400cm^<-1>) is very sensitive to changes in the electrolyte concentration. The parameter for a measurement of small bands fits by Raman difference spectroscopy (RDS) proposed in the recent literature, which can clearly indicates a small change in the Raman spectrum, was utilized in this investigation. Corrosion pits occurred on the specimen surface after 60 minutes under the condition of +200 mV(SCE) in 0.5 mol/l NaCl solution and, in this case, the parameter was monotonically increased with the exposure time. On the contrary, in the case where no corrosion pits occurred, no increase in the parameter was observed. These results demonstrate that the enrichment of chloride ion was observed only on the specimens where the corrosion pits were formed.
一般社団法人日本機械学会の論文
2001-10-20