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a. Aluminum poles. Aluminum alloy parts in con­tact with steel or other dissimilar metal require painting, as may the steel surfaces. Aluminum sur­faces embedded in concrete ordinarily need not be painted, unless exposed to extremely corrosive con­ditions.

b. Self-weathering steel poles. It is important that all vegetation be kept away from these poles. Self-weathering steel, if kept moist, will corrode at a rate equal to plain carbon steel, unless protected with a high quality paint system. Salt fogs cause an accel­erated corrosion because the salt residue remains on the pole. Self-weathering steel is not a com­pletely maintenance-free material.

4-27. Transmission line metal towers.

Towers are assembled of various structural compo­nents that are bolted, riveted, or welded in place into a lattice type construction. All surfaces are more or less accessible for cleaning and painting. Most steel towers are galvanized to delay corrosion

and rusting. Although galvanizing may provide good protection for many years, its effectiveness de­pends a great deal on the climate and area contami­nants. Towers should be inspected for rusting and loose bolts. Spot painting is indicated for incidental rusting, but complete paint coverage is necessary where rusting is severe.

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