This study evaluated the performance of four coating systems applied on chloride-contaminated steel substrates. The purpose of the study was to identify coating systems that can provide extended service life for steel bridges with minimal surface preparation at a much reduced cost. The study helps estimate the amount of chloride contamination coating systems can tolerate without significant premature failure. The chloride contamination levels tested in this study were 0, 20, and 60 μg/cm2 . The coating systems tested were two 3-coat systems (one with inorganic zinc-rich primer and the other with organic zinc-rich primer), a 2-coat system with carbon nanotubes in its zinc-rich primer, and a 1-coat system of high-ratio calcium sulfonate alkyd. Coated panels were exposed to two conditions: accelerated laboratory testing and outdoor natural weathering. The 3-coat systems had the best corrosion protection performance among the tested specimens. The inorganic zinc primer performed slightly better than the organic zinc primer. The 2-coat system demonstrated the highest adhesion strength over all levels of chloride contamination.
All steel bridge systems and their components need some levelof corrosion protection to assure a serviceable life. One of twoapproaches is typically u...
The Senate and House Appropriation Committee reports to accompany the U.S. Department of Transportation and the U.S. Department of Housing and Urban D...
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