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The “Weakest Link” on any structure is found at the nut and bolt assemblies. Nuts and bolts are found on every structure. “The fate of any complex steel assembly may be determined by the vulnerability of its smallest and least considered components”. “The bolts or fasteners holding the assembly together are often the areas where corrosion starts first and where the effects of corrosion may have the most serious consequences”.
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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.
The use of traditional corrosion inhibitors in paints and coatings continues to be challenged from both an environmental and performance aspect. End users are demanding better corrosion performance, and in many cases, this cannot be achieved with traditional zinc or chromate type inhibitors. The use of VCIs (vapor corrosion inhibitors) in coating formulations has shown that in many systems, they can replace the older technology or significantly improve the performance of the system by working in synergy with the existing inhibitors.