Abstract
It was proved that the corrosion potential of metals in a very small area can be measured by means of a microelectrode. The microelectrode is a thin-walled glass capillary containing a corrosive solution. The tip of electrode is so fine that the area contact with metal surface is limited to 0.02 to 0.03 mmφ. 10%NaCl and 20%H2SO4 solution were preferred as the corrosive media. The corrosion potentials at Zn, Fe, Cd, Sn, Cu, Al and Sb were measured by the microelectrode and they were compared with the result by the normal method. When 20%H2SO4 solution was introduced into the capillary, the potential values obtained by the two methods agreed very well with each other. However, in the case of 10%NaCl in 0.02∼0.03 mmφ capillary, some discrepancies were noted.
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