The California Department of Transportation Chemical Testing Laboratory conducted a 5-year corrosion study evaluating the potential effectiveness of using a single component High Ratio Co-Polymerized Calcium Sulfonate (HRCSA) coating to address pack rust and crevice corrosion on the State's structural steel bridges. Previously painted and corroded steel sandwich test panels were overcoated with different paint systems then exposed to an outdoor marine environment for 3 yrs. The quantitation of steel removed by corrosion and surface pitting was done using Scanning White Light Interferometry. The coating systems used for the comparison study were ranked based upon their ability to stop the crevice corrosion from advancing.

Subject
Pits, Paint removal, Primers, Steel surfaces, Corrosion products, Crevice corrosion, Steel, Pitting, Dry film thickness, White light interferometry, Bridges, Paints, Cleaning
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2020
Association for Materials Protection and Performance (AMPP)
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