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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.
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.
The presentation will discuss the challenges, overall objective and unique characteristics of the viscous-elastic semi-solid compound and bolt cap protection system. Testing, installation procedures and previous projects will be covered. One of the projects to be covered is the system used to protect the support rods of the recently constructed San Francisco Bay Bridge connecting Oakland to San Francisco. The bridge made the news prior to opening when it was determined that a portion of the support rods were experiencing fatigue and showing signs of premature failure.
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Substrate preparation which includes the removal of contaminates, abrading or etching to create a surface profile via mechanical or chemical methods have a major impact on the adhesion performance of applied coatings. For coatings, a primary performance characteristic is adhesion after exposure to corrosive environments. One of the consequences of corrosion forming under a coating is the loss of adhesion or delamination of the coating.
This paper will describe this commonplace corrosion problem associated with protective coating damage at dissimilar metal bolted connections and present a typical case history. The paper will go on to explain why slotted bolt holes are more susceptible to more aggressive corrosion damage than round bolt holes. In addition, the paper will present successful measures that can be taken to prevent this prevalent problem.