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Characterization of the corrosion resistance of duplex stainless steels using local current density mapping techniques

An in situ investigation of the dissolution behavior of duplex stainless steel has been carried out in acidic solutions containing 2.0 M HCl with 2.0 M H{sub 2}SO{sub 4} to determine differences in dissolution rates of the austenitic and ferritic phases. The current density distribution over the dissolving steel surface was measured using a vibrating electrode. The study demonstrated that this technique could quantify the differences in dissolution rates of the austenitic and ferritic phases under the conditions tested. The dissolution rates for the two phases peak at different potentials resulting in multiple current maxima. In addition, transients in dissolution behavior of the two phases at different potentials were observed using optical microscopy. Electron microscopy of the dissolved surface showed very high levels of aluminum and silicon enrichment on the austenitic phase.