A two-year Federal Highway Administration (FHWA) in-house study was launched in November 2006 to evaluate various coating materials that may be applied as one-coat systems to steel bridges. A total of eight test materials plus two control systems, a 3-coat and a 2-coat, were applied over near-white steel test panels (SSPC-SP10). Their performance has been evaluated for 20 months using electrochemical impedance spectroscopy, surface failure characterizations, rust creepage at scribe, pull-off adhesion, and changes of color and gloss. This paper discusses the up-to-date results obtained from accelerated laboratory testing and outdoor exposure testing in a marine environment.

Subject
Holidays, Test methods, Coating performance, Marine environments, Coatings, Materials, Adhesive strength, Rust, Dry film thickness, Coating defects, Holiday detection, Hardness, Coating systems
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2009
Association for Materials Protection and Performance (AMPP)
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