A micro-electrode constructed with a glass capillary tip containing a Pb(Hg)/PbSO4 reference electrode was prepared and applied to measure the potential profile over a low-C–Mn steel weldment after corrosion in 10−3 M sulfuric acid. The Pb(Hg)/PbSO4 reference electrode was superior to the normal needle-like metal electrodes such as Pt, Sb, and Sn in potential reproducibility and the rate of response to change in a potential distribution. The potential sensitivity made this micro-electrode promising for in situ identification of a local anode and cathode through a relatively thick oxide film of a corroded specimen. A good correlation between the potential profile and surface morphology was observed.

Subject
Materials, Potential differences, Sulfuric acid, Reference electrodes, Oxide films, Surface morphology, Potential measurements, Immersion, Localized corrosion, Electrodes, Corrosion potential, Electrode potential, Anodes
National Association of Corrosion Engineers
1989
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