Study of Electrochemical Inhomogeneity of Zinc in Zinc/Steel Couple during Galvanize Corrosion by Wire Beam Electrode

The localized electrochemical characteristics of the anodic metal within a zinc/steel couple immersed in seawater was investigated using an Wire Beam Electrode(WBE) composed of 9 zinc wire sensors together with 112 mild steel ones. The results showed that potential and current density distributions of zinc wires were inhomogeneous; main anodic area transferred from the zinc wires adjacent to steel wires to those farther away from zinc/steel interface gradually; besides, some zinc wires behaved as secondary cathodes. This electrochemical inhomogeneity of zinc might mainly be ascribed to the dissimilar distance between zinc and mild steel wire sensors, and their surface electrochemical state as well.

The electrical polarization of frog skin by direct currents

Results concerning the electrical polarization of frog skin by direct currents are presented with adequate statistical control. The results are discussed and show that the skin is electrically non-homogeneous and in a state of disequilibrium. The results are presumptive evidence for at least a three-unit model consisting of a series resistance and local action between an anodic area and a cathodic area as is also considered in the theory of corroding metals.