12/16/2023 0 Comments Does aluminium corrode in water![]() ![]() A coating evaluation testing site was established at the Kennedy Space Center in the 1960s. (The amount of time exposed surfaces remain wet, and the temperature and frequency of temperature cycles are likely to be relatively higher in many coastal applications.) Coated aluminum panels have been performance-tested in South Florida’s high-salt, high-humidity, and high-ultraviolet (UV) exposure environment.įlorida’s coastal regions represent the most corrosive in the continental United States, with Cape Canaveral cited as the most corrosive atmospheric environment. One of the most aggressive outdoor environments for aluminum is the seacoast as illustrated in the map, which compares wet chloride ion concentrations throughout the United States. The program is a cooperative effort between many different groups including federal, state, tribal and local governmental agencies, educational institutions, private companies, and non-governmental agencies. You May Also Like Get a grip on stainless steel railing finishes The map, shown in Figure 1 is referenced showing a threshold level of 4.5 kg of chlorine ion wet deposition per 1 ha (9.92 lb per 2.47 acres). In an effort to have a more technically sound basis for definition, AAMA’s Coastal Corrosion Task Group uses the definition of a “coastal” exposure as shown on the National Atmospheric Deposition Program (NADP) maps from 2010. Various sources use 457.2 m (1500 ft), 2.4 km (1.5 mi), or “within eyesight of the ocean” as definitions. Aluminum is highly resistant to weathering, including many industrial and harsh atmospheres that often corrode other metals.Įven at substantial distances from the ocean, structures are susceptible to corrosion from salt. The Qualicoat Standard, the specification for coated architectural aluminum in the United Kingdom and Ireland, defines coastal as within 5 km (2.8 mi) from any coast or tidal estuary.Īccording to the Aluminum Association, their namesake material remains resistant to corrosion unless it is exposed to some substance or condition that destroys the protective oxide coating. The American Architectural Manufacturers Association (AAMA) Coastal Corrosion Task Group continues to discuss the definition for sites far from saltwater, but still with high atmospheric alkaline concentration ( e.g. What defines a ‘coastal’ environment has been debated for decades. Image courtesy National Atmospheric Deposition Program/National Trends Network () ![]() This map shows chloride ion wet disposition from 2010. Specifiers can successfully select a painted coating or anodize finish meeting a project’s required performance and long-term durability by carefully considering the building’s location and function, the owner’s desired visual appearance and environmental attributes, and the architectural aluminum products’ proximity to dissimilar metals. Without proper precautions and finishes, corrosion to these components can damage the building envelope’s structural integrity, leading to systemic failure. Aluminum windows, storefronts, entrances and curtain walls, sun shades, canopies, skylights, column covers, rainscreens, and exterior panels all integrally connect to a building’s façade. ![]() Photos courtesy Super Sky Products EnterprisesĬoastal areas are beautiful locations for commercial and residential buildings, but also pose the greatest challenges in protecting exterior-facing architectural aluminum products from corrosion. ![]()
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