United States Department of Transportation
i
Environmentally Acceptable Materials for the Corrosion Protection of Steel Bridges: Task C, Laboratory Evaluation
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1992-09-01
[PDF-1.69 MB]
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Abstract:The recently promulgated environmental regulations concerning volatile organic compounds (VOCs) and certain hazardous heavy metals have had a large impact on the bridge painting industry. As a response to these regulations, many of the major coating manufacturers have begun to offer "environmentally acceptable" alternative coating systems to replace those traditionally used on bridge structures. In the interest of determining the relative corrosion control performance of these newly available coating systems, the Federal Highway Administration contracted for a seven-year study. As a precursor to long-term, natural exposure testing of various environmentally acceptable coating systems, a battery of accelerated laboratory screening tests were performed. These tests included 13 high solids or waterborne, conventionally applied coatings; 14 powder coating or metallized coatings; and 7 high VOC control coatings. These systems were tested in a cyclic salt fog/natural marine exposure, a cyclic brine immersion/natural marine exposure, and a natural marine exposure. Adhesion and water penetration tests were also performed on each system. The results of these various tests were used to develop a matrix of test coatings to be used in the follow-on, long-term natural exposure testing. In the accelerated laboratory screening tests, several of the low VOC coating systems performed as well, or better than the high VOC controls. In general, the low VOC zinc-based systems (both inorganic and organic zinc) and the epoxy mastic type systems performed the best in the accelerated tests. These types of systems were included in the long-term exposure test matrix.
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