1.1 – zintek® – 7. Corrosion resistance 41 Compatibility between materials for the application and production of roof and façade claddings, sheet metal work, substructures and anchoring systems: Material with prevailing mass Aluminum Al Lead Pb Copper and its alloys Titanium-zinc Zn-Ti Stainless steel a) Galvanized steel Aluminum Yes Yes No Yes Yes b) Yes Lead Yes b) Yes Yes Yes Yes Yes Copper and its alloys No Yes Yes No Yes No Titanium-zinc Yes Yes No Yes Yes Yes Stainless steel a) No Yes Yes No Yes No Galvanized steel Yes Yes No Yes Yes b) Yes a) Austenitic stainless steels: the properties of stainless steel can be modified by adding other metals to the alloy to counter the influences of the various areas of use. The main components are chromium, nickel, molybdenum and titanium. The resistance of stainless steels to corrosion depends on the presence on the surface of a layer of oxides, called passive layer. Nickel-chromium steel is the most suitable for accessories and anchoring systems. For flue pipes and sheets in close proximity, however, greater resistance to corrosionmust be guaranteed to deal with the sulfur load, choosing an alloy with addedmolybdenum. Stainless steel fixings must be at least A4 quality (withminimummolybdenum content of 2%). Ferritic stainless steels are magnetic and have limited use in roofs, sheet steel works and façades. b) Contact between these metals is possible only in dry areas without the stagnation of humidity and/ or condensation water. Roof with titanium-zinc zintek® standing seam cladding in an industrial environment. EXCERPT
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