Abstract
The development of a highly aggressive solution locally is recognized as the root cause of the localized attack in stainless steels. While modeling has tried to rationalize the development of these localized chemistries on the basis of mass transport considerations, no comprehensive measurement of how this chemistry develops has been performed. Ion chromatography (IC) allows the ionic speciation of small (<100 μl) volumes of solution to be quantitatively analyzed with sensitivities in the ppb range. The application of IC analysis to localized corrosion sites of stainless steel is demonstrated for the first time. This preliminary work shows that full characterization of the chemistry of the localized corrosion site chemistry is possible, especially for the transition metals, even for solutions extracted from very small (<1 μl volume) crevices.
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