10164 Application of an Electrochemical Micoshell for Corrosion Measurements on Stainless Steels

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Product Number: 51300-10164-SG

ISBN: 10164 2010 CP

Author: Matthias Sorg, Thomas L. Ladwein, Karsten Wiegers, Jens Maier, Sebastian Schilling and Mike Oehler

Publication Date: 2010

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With an electrochemical microcell it is possible to make measurement without effects of edges or different surface modifications on one specimen. It allows you to measure base material and welds separately. The preparation of the specimen is simple because you only need a small area for the measurements. For statistics it is possible to make a few measurements on one specimen to check the reproducibility.

For this work the following electrochemical techniques were tested with the microcell: linear polarization curves, electrochemical impedance spectroscopy and electrochemical potentiokinetic reactivation test (double-loop EPR). The results of the measurements were reproducible and in some cases better for interpretation than measurement with a standard cell. The values of the pitting potential, determined with the linear polarization technique, were higher in average than the values from the standard cell. With the electrochemical impedance spectroscopy it was possible to study the passivation behaviour of a stainless steel over time on one specimen. Double-loop EPR-test with the microcell allows the separate investigation of sensitization on base material, weld and heating zone.

Keywords: electrochemical microcell, EPR, corrosion measurements, stainless steel