fischer Installation Systems Main Catalog Page 473
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Basics Corrosion protection In most cases, pipes and supply lines are installed in dry rooms. Therefore, in addition to corrosion resistant materials, such as plastics or stainless steel and copper, the steel products used for installation systems are galvanised. A zinc coating thickness of 5-8 µm by means of electrolytic process (galvanising) is standard. For mounting channels, Strip galvanised material is mainly used. Strip galvanising is a method in which the material is drawn through a molten zinc bath, thereby achieving a zinc layer thickness of 12-25 µm. Besides a pure zinc coating also zinc-magnesium coating is possible. ZM-coatings have a higher corrosion resitance at the same layer thickness. This method is used when there is no more welding for the subsequent processing. This is the case for mounting channels because they are cold-formed after galvanising. By cutting and stamping the holes, the surface in this area is not completely covered by a protective layer. Punched mounting channels are therefore partly recommended for interior rooms. For cantilever brackets, non-galvanised channel pieces are used which are welded to the base plate. Following completion, the entire component is galvanised, creating a zinc coating thickness of 5-8 µm , or hot-dip-galvanized with minimum 45 µm zinc layer.. If installation systems are installed outdoors or in wet interior rooms, they must be made of either hot-dip galvanised steel, zinc-magnesium coated steel or stainless steel. 12 Hot-dip galvanising is very well suited to the protection of steel. The corrosion process is thus 10 times slower than with galvanising. The zinc loss depends on the surrounding atmosphere and humidity. An annual zinc reduction of 1–10 μm can, however, be assumed. The layer thickness is therefore crucial to the durability of the material. Crucial here are the environmental influences under which the systems are installed. An overview of the expected impact on the protective action can be seen in the following diagram and tables. Hot-dip galvanised steel 100 Zinc coating thickness in µm 80 Korrosivitätskategorien auf Basis der DEN EN ISO 12944-2 60 40 CX: e.g. offshore areas with high humidity and aggressive atmosphere C5: e.g. coastal and offshore areas with high salt content and industrial pollution C4: e.g. chemical plants, coastal ship and boatyards, industrial areas C3: e.g. urban and industrial areas with moderate pollution C2: e.g. unheated buildings with condensation potential C1: e.g. heated buildings with clean air (offices, shops, schools, hotels) 20 0 0 10 20 30 40 50 Protection period in years (average)In practice, the actual service life often exceeds the values specified in the standard. 60 70 80 Minimum zinc coating thickness (≥45 µm, hot-dip galvanised with steel 1.5 - 3.0 mm) High zinc coating thickness (≥75 µm, hot-dip galvanised)Data basis: DIN EN ISO 1461 Translated with DeepL.com (free version) 473
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