Abstract
Corrosion protection measures are divided into active and passive processes. Electrochemical corrosion protection plays an active part in the corrosion process by changing the potential. Coatings on the object to be protected keep the aggressive medium at a distance. Organic coatings applied primarily to protect pipelines and storage tanks include paints, plastics, and bituminous materials. All organic coatings show varying degrees of solubility and permeability for components of the corrosive medium, which can be described as permeation and ionic conductivity. An absolute separation of the protected object and the medium is not possible because of these properties. Cement coatings are usually applied as linings for water pipes and water tanks, but occasionally also for external protection of pipelines. Cement is not impervious to water, so electrochemical reactions can take place on the surface of the object to be protected. In addition, enamel coatings are applied for internal protection of storage tanks. Enamel is impervious to water—that is, it separates the protected object and the corrosive medium. Metal coatings are applied in special cases where the protective action has to be ensured by the coating metal or its corrosion products.
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