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. A duplex system may be used in harsh conditions such as moist enclosed spaces or highly polluted environments. This system consists of a powder applied paint coating over the galvanized surfaces. Tubes and purlins as well as washers have fully galvanized surfaces according to ASTM A653 G-90 for the former and ASTM A123 for the latter. This duplex system provides top level protection against corrosion and extends the service life of the galvanized steel, offering both a cathodic as well as barrier protection against corrosion
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