SEDL / STP / STP1277-EB / STP37954S

Analysis of Electrochemical Noise for Type 410 Stainless Steel in Chloride Solutions

Kelly, RG
Assistant professor, postdoctoral research associate, Department of Materials Science & Engineering, and professor, Department of Chemical Engineering, University of Virginia, Charlottesville, VA

Inman, ME
Assistant professor, postdoctoral research associate, Department of Materials Science & Engineering, and professor, Department of Chemical Engineering, University of Virginia, Charlottesville, VA

Hudson, JL
Assistant professor, postdoctoral research associate, Department of Materials Science & Engineering, and professor, Department of Chemical Engineering, University of Virginia, Charlottesville, VA

Pages: 13    Published: Jan 1996

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Abstract

The electrochemical noise resulting from the corrosion of Type 410 stainless steel under open circuit conditions in solutions of widely different corrosivity has been examined. Parameters derived from electrochemical noise measurements and conventional electrochemical measurements were correlated with one another and with post-test examination of the specimens. Both the noise resistance and the polarization resistance increased with decreases in solution corrosivity. In all of the solutions studied, the noise resistance was found to be consistently higher than the polarization resistance. In solutions in which pitting occurred, the open circuit potential of the electrode versus a true reference electrode was more sensitive to the transition to stable pitting than was the pitting index.