By Wachei, Szenasi
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Corrosion Inhibitors. A water-soluble corrosion inhibitor reduces galvanic action by making the metal passive or by providing an insulating film on the anode, the cathode, or both. A very small amount of chromate, polyphosphate, or silicate added to water creates a water-soluble inhibitor. A slightly soluble inhibitor incorporated into the prime coat of paint may also have a considerable protective influence. Inhibitive pigments in paint primers are successful inhibitors except when they dissolve sufficiently to leave holes in the paint film.
Because the cathodic protection current must protect only the bare or poorly insulated areas of the surface, coatings that are highly insulating, very durable, and free of discontinuities lower the current requirements and system costs. A good coating also enables a single-impressed current installation to protect many miles of piping. Coal-tar enamel, epoxy powder coatings, and vinyl resin are exam- ac line Insulated copper wire Rectifier. Insulated copper wire Soil Soil Active metal anode Pipeline Pipeline Current Current Backfill (a) Anode Backfil (b) Fig, 1 5 Cathodic protection for underground pipe, (a) Sacrificial or galvanic anode, (b) Impressed-cur^* rent anode, ac, alternating current pies of coatings that are most suitable for use with cathodic protection.
Alkaline pigments, such as metaborates, cement, lime, or red lead, are effective, provided that the environment is not too aggressive. In addition, many new pigments have been introduced to the paint industry such as zinc phosphosilicate and zinc flake. Barrier coatings are used to prevent the electrolyte from reaching the component surface. , chromium, copper, or nickel). Protection is effective until the coating is penetrated, either by a pit, pore, crack, or by damage or wear. The substrate will then corrode preferentially to the coating (since it is anodic to the coating material), and corrosion products will lift off the coating and allow further attack (Fig.