Corrosion Management of Elevated Lattice Galvanized Structures

From JPCL, June 2016

By Mark B. Dromgool, KTA-Tator Australia Pty Ltd

Elevated lattice-form galvanized steel structures pose some quite unique challenges to control corrosion, to preserve their functionality and extend their durability, especially in more corrosive environments or after many years of exposure. This article outlines some of the more successful methods that have been employed by elevated structure owners and contractors to maintain and preserve these vital infrastructure items and to improve the durability of new-build towers....


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Tagged categories: Coating Application; Galvanized steel; Maintenance coating work; Mark Dromgool; Paint application; Power

Comment from Sukhmander Singh, (7/18/2016, 10:15 AM)

Has Cold Galvanizing application over hot-dip-galvanized sections been tried? It can be applied over already galvanized surfaces without abrasive cleaning and protect the member from corrosion, same as HDG, to somewhat lower life, but higher than any paint formulation. Will like to know experiences and field trial data/reports with Cold Galvanizing for site maintenance of towers, bridges and other structures. Shall appreciate comments copied to: sukhmander@vsnl.net


Comment from Antonio Leal, (7/19/2016, 11:39 AM)

Hot dip galvanizing or cold one, its lifetime depend greatly on the seriousness of how it was applied. But we know that the particles of zinc do not have a binder that can withstand the weather and begin to dissipate with rain wind and snow. Although it is one of the best primers, when it is expected longevity is convenient after the zinc cure, a coat of tie-coat should be applied at low thickness as intermediate and finished in polyurethane. For maintenance on a system as shown in these photos, it is recommended severe mechanical cleaning in the collapsed area and correction with epoxy pigmented with zinc and aluminum.


Comment from Antonio Leal, (7/19/2016, 11:42 AM)

Hot dip galvanizing or cold one, its lifetime depend greatly on the seriousness of how it was applied. But we know that the particles of zinc do not have a binder that can withstand the weather and begin to dissipate with rain wind and snow. Although it is one of the best primers, when it is expected longevity is convenient after the zinc cure, a coat of tie-coat should be applied at low thickness as intermediate and finished in polyurethane. For maintenance on a system as shown in these photos, it is recommended severe mechanical cleaning in the collapsed area and correction with epoxy pigmented with zinc and aluminum.


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