Controlling Bridge Corrosion via Galvanizing, Metallizing, and Duplex Coatings

Corrosion of steel is a worldwide problem. With that in mind, Tuesday's forum at the 2022 AMPP Annual Conference + Expo discussed the corrosion protection measures of galvanizing, metallizing, and duplex coatings, along with shared experiences from Department of Transportations (DOTs) and paint manufacturers in dealing with them.

In their presentations, Kevin Irving (International Zinc Association), Derrick Castle (Sherwin-Williams Company), Maxim Dube (Galvatech 2000), and Alana Fossa (American Galvanizers Association) discussed the use of duplex coatings for new steel, along with an analysis of what measures need to be considered and taken for coating the galvanized/metallized steel. Slip and creep of faying surfaces were also discussed.

They presented numerous current case studies for galvanized bridges over 50 years old with no maintenance to date—meaning the first cost is still the same cost—and for metallized bridges over 20 years old with no maintenance. Duplex bridges were also highlighted, with a current case study as well.

Irving, Castle, Dube, and Fossa answered questions from the audience throughout the forum, and after all four presentations, they provided a hands-on demonstration of adhesion tests of duplex coatings on galvanized and metallized panels.

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