When two different metals are in contact and exposed to moisture containing salts or pollutants, one of the metals can experience accelerated corrosion while the other remains protected. This type of accelerated corrosion between dissimilar metals negatively impacts the overall corrosion protection of the project and is referred to as galvanic corrosion, bi-metallic corrosion, or dissimilar metal corrosion. It can be prevented by utilizing compatible metals and/or favorable surface area ratios, providing barriers to break electrical contact between metals, or isolating the metals from the environment.
Building for durability of concrete infrastructure in severe environments is an ongoing challenge for contractors and engineers. Using a performance-related design method offers a good strategy for extending service life by taking a long-term approach to mitigating corrosion.
Marine environments are known for posing an elevated threat of corrosion to metal. Engineers take special precautions to address this problem when designing reinforced concrete structures in these Regions. Bio-based migrating corrosion inhibitors can be an important design factor when building a sustainable structure in a corrosive marine environment.
Located on the Gulf of Mexico, the building façade of the Westin Tampa Waterfront in Tampa Bay, Florida, is often subjected to the negative effects of rain, wind, high humidity, saltwater corrosion, bright sun, and soaring temperatures. Rapid fading and chalking of painted exteriors in the area is a problem that could be expensive and time-consuming to repair, as well as cause disruption to building occupants and visitors.
The effects of corrosion on metal building components range from aesthetically undesirable appearances to hazardous structural conditions. This is particularly the case for masonry buildings constructed in the early 1900s, where unprotected structural steel is often in contact with exterior wall construction.