How can manufacturers prevent galvanic corrosion during assembly of mixed-metal facade systems?

Preventing galvanic corrosion in mixed-metal facade systems requires foresight in material selection, interface design and on-site detailing, particularly where aluminum interfaces with stainless steel, zinc, copper or galvanized steel in salty Gulf environments. Start by selecting compatible alloys and fasteners — 300-series stainless for exposed fasteners and isolating non-conductive washers or polymer shims at points of contact. Avoid direct contact between aluminum and more noble metals; when unavoidable, specify protective coatings or sacrificial anodes and ensure the junction is accessible for inspection. Design for drainage: trapped water accelerates galvanic action, so provide positive slope, weep holes and venting in mullion cavities. Use insulating materials such as EPDM gaskets, neoprene washers and non-conductive sealants to physically separate dissimilar metals. In door and canopy interfaces, pay special attention to crevice details where salt deposits can concentrate and initiate corrosion. During fabrication, avoid mixed-metal tool contamination — separate workstations and tool sets reduce cross-contamination that can embed foreign metals into aluminum surfaces. For projects in the Middle East and Central Asia, document material pairings in the shop drawings and include galvanic risk assessments in the QC package. Include guidance for installers in Central Asian climates like Bishkek and Dushanbe where construction practices and detailing may differ, and document isolating strategies accordingly. Finally, establish a maintenance guide for the owner that includes periodic rinse cleaning of salt deposits, inspection intervals and corrective actions. These design and assembly practices dramatically reduce galvanic failures and extend the façade life in harsh coastal climates.