Abstract
Electrochemical processes of the oxidation of the solution components take place on its surface under the action of the external anodic current. As the principle of protection from electrocorrosion under consideration is implemented, the value of the oxidation potential of the anode, Eox, does not depend on determining the characteristics of its interaction with the metal–aggressive environment. Generally, the maximum potential value at the anode end, which is at a maximum distance from the protected area of the structure along the field of the external current, can be higher, lower, or equal to Ea. When the requirement Ea <Emax is not fulfilled at the remote anode end, reduction of the potential takes place along the anode, toward the protected structure. The size of this reduction depends, first of all, on the dimensions of the anode. The protection of metals against corrosion by an external current becomes more complicated when the current can randomly change its direction. This may occur due to changes in the number of operating electrolyzers in relation to the zero point of a set and to the periodical inclusion of additional current sources to the circuits of the electrolyzers, etc. In modern plating plants, periodic reversal of a current is used for depositing a metal on a cathode. Titanium piping, which is able to maintain its corrosion resistance under the action of a cathodic current in chloride-containing media, corrodes under the attack of a comparatively low anodic current. On the other hand, the stability of most coatings on stable anodes is reduced under the attack of a comparatively low cathodic current.
Published Version
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