Whether in steel or aluminum, Geometrica structures are highly resistant to corrosion.
Zinc is the most effective way to protect steel and Geometrica's steel tubes are always galvanized. For most structure exposures Geometrica's standard galvanizing has an expected life to first maintenance of over 40 years. In aggressive environments, such as damp interiors or exterior structures exposed to pollution, a clear acrylate coating called Galvacoat may be applied over the galvanizing. With Galvacoat, the steel tube has 3 layers of corrosion protection: The first layer is the high-purity zinc. The second layer is a conversion coating that passivates the zinc and primes the surface. The third layer is a transparent organic coating that seals the surface. The resulting finish is beautifully shiny and smooth, and increases the galvanizing life by four times (per salt spray testing).
Aluminum structures are available for extraordinarily corrosive environments, such as swimming pool covers (subject to chlorine attack), or exposed structures within 50m of the ocean (such as those featuring internal cladding at a port). Aluminum is naturally resistant to corrosion and may be left unpainted. On contact with air it forms a resistant layer of aluminum oxide that arrests any further attack. And Geometrica’s aluminum structures may also be clear anodized to maintain their appearance. Geometrica has built the world's largest aluminum domes. All Geometrica structures may also be powder- or wet- coated in a variety of attractive colors.
Steel and Aluminum!
All Geometrica galvanized steel structures contain some aluminum components: the connectors. This raises the frequent question of whether the two materials are compatible or are subject to galvanic corrosion. By theory, experiments and practice, these two materials are definitely compatible.
 Jones, D., Principles and Prevention of Corrosion, Mcmillan, New York, 1992.
 Doyle, D.P. and Wright, T. E., "Quantitative Assessment of Atmospheric Galvanic Corrosion", Galvanic Corrosion, ASTM STP 978, H.P.Hack, Ed., American Society for Testing and Materials, Philadelphia, 1988, pg. 168.
 Aluminum Design Manual, The Aluminum Association, Washington D.C., 2000