The Electrochemical Properties of Zinc-rich Paints

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Abstract
The paper distinguishes between the electrochemical and chemical rôles of zinc-rich paints. Use was made of a technique in which the zinc paint layer was insulated from the underlying steel surface. It was shown that the corrosion behaviour of artificial pores provided in such coatings was much less satisfactory than at similar pores in painted specimens from which insulating layers were omitted. Use of a micro-electrode also showed that a much more rapid rise in pH was experienced at the exposed steel surface in specimens of the second kind. This provides further evidence of a short period of cathode protection which, however, is essential if the protection due to subsequent precipitation of zinc salts is to prove adequate.